Leases - Future Minimum Payments Table (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Operating Leases, Future Minimum Payments | ||||||||||||
| Due Next Twelve Months | $ 250 | [1] | $ 380 | [2],[3] | ||||||||
| Due Year Two | 56 | [1] | 184 | [3] | ||||||||
| Due Year Three | 22 | [1] | 238 | [3] | ||||||||
| Due Year Four | 21 | [1] | 264 | [3] | ||||||||
| Due Year Five | 21 | [1] | 264 | [3] | ||||||||
| Thereafter | 160 | [1] | 999 | [3] | ||||||||
| Total lease payments | 530 | [1] | 2,329 | [3] | ||||||||
| Less: Interest | (105) | [1] | 0 | [3] | ||||||||
| Present value of lease liabilities | 425 | [1] | 2,329 | [3] | ||||||||
| Finance Leases, Future Minimum Payments | ||||||||||||
| Due Next Twelve Months | 11 | 5 | [4] | |||||||||
| Due Year Two | 10 | 5 | [4] | |||||||||
| Due Year Three | 10 | 5 | [4] | |||||||||
| Due Year Four | 10 | 5 | [4] | |||||||||
| Due Year Five | 10 | 5 | [4] | |||||||||
| Thereafter | 136 | 73 | [4] | |||||||||
| Total lease payments | 187 | 98 | [4] | |||||||||
| Less: Interest | (128) | (39) | [4] | |||||||||
| Present value of lease liabilities | 59 | 59 | [4] | |||||||||
| Operating Lease, Lease Not yet Commenced, Payments Due | $ 2,000 | 1,600 | ||||||||||
| Operating Leases, Payments for Short-term Leases | 79 | |||||||||||
| Operating Leases, Payments for Non-lease Components | 98 | |||||||||||
| Operating Leases, Future Minimum Sublease Payments Receivable | $ 43 | |||||||||||
| Maximum [Member] | ||||||||||||
| Finance Leases, Future Minimum Payments | ||||||||||||
| Operating Leases, Lease Not yet Commenced, Term of Contract | 7 years | |||||||||||
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| X | ||||||||||
- Definition Lease, Liability, Payments, Non-Lease Component No definition available.
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| X | ||||||||||
- Definition Operating Lease Lease Not yet Commenced Expense No definition available.
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| X | ||||||||||
- Definition Operating Leases, Payments for Short-term Leases No definition available.
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- References No definition available.
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| X | ||||||||||
- Definition Present value of lessee's discounted obligation for lease payments from finance lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease, due after fifth fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease, due in next fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fifth fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fourth fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease, due in third fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease, due in second fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in next fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Contractually required future rental payments receivable on noncancelable subleasing arrangements. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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- Details
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