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Leases (Schedule of Total Lease Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]      
Operating lease cost $ 25 $ 10 $ 40
Short-term lease cost [1] 89 45 84
Financing lease cost:      
Amortization of right-of-use assets 8 8 8
Interest on lease liabilities 11 11 10
Variable lease cost (4)   2
Lease income (8) (8) (5)
Net lease cost $ 121 $ 66 $ 139
[1] Short-term lease cost excludes leases with terms of one month or less.