Income Taxes (Details) - USD ($) $ in Millions  | 
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2021  | 
Jun. 30, 2020  | 
Jun. 30, 2021  | 
Jun. 30, 2020  | 
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| Income Tax Disclosure [Abstract] | ||||
| Income tax provision (benefit) | $ (93) | $ 63 | $ (4) | $ 194 | 
| Effective Income Tax Rate | 41.50% | 13.50% | (0.90%) | 16.20% | 
| Income tax expense as a result of one-time discrete event | $ 58 | $ 38 | ||
| U.S. corporate income tax rate | 21.00% | 21.00% | 21.00% | 21.00% | 
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- References No definition available. 
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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