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Leases (Schedule of Leasing Activity) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]      
Operating lease cost $ 51 $ 50 $ 54
Short-term lease cost 528 112 121
Total lease cost 579 162 175
Cash paid for amounts included in the measurement of lease liabilities      
Operating cash flows from operating leases 59 61 56
Financing cash flows from finance leases 13 11 6
Right-of-use assets obtained in exchange for new operating lease liabilities 33 62 20
Right-of-use assets obtained in exchange for new finance lease liabilities $ 11 $ 34 $ 13
Weighted-average remaining lease term-operating (in years) 6 years 6 years 8 years
Weighted-average remaining lease term-finance (in years) 3 years 3 years 3 years
Weighted-average discount rate-operating leases 6.30% 6.80% 7.60%
Weighted-average discount rate-finance leases 4.00% 4.70% 5.60%