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Leases (Schedule of Total Lease Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease cost $ 12 $ 25
Short-term lease cost [1] 21 45
Financing lease cost:    
Amortization of right-of-use assets 6 12
Interest on lease liabilities 2 5
Variable lease cost   1
Lease income (1) (2)
Net lease cost $ 40 $ 86
[1] Short-term lease cost excludes leases with terms of one month or less.