Annual report pursuant to Section 13 and 15(d)

Leases - Income Statement Location Table (Details)

v3.20.4
Leases - Income Statement Location Table (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finance lease cost:      
Total lease cost $ 441 $ 625  
Operating leases, rent expense     $ 335
Operating costs and expenses [Member]      
Lessee, Lease, Description [Line Items]      
Operating lease cost [1] 432 612  
Finance lease cost:      
Short-term lease costs 93 230  
Variable lease costs paid to the lessor 16 7  
Depreciation and amortization expense [Member]      
Finance lease cost:      
Amortization of right-of-use assets 2 3  
Interest expense, net of capitalized interest [Member]      
Finance lease cost:      
Interest on lease liabilities $ 7 $ 10  
[1] Presented in cost of sales, operating and maintenance expense or selling, general and administrative expense consistent with the nature of the asset under lease.