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Leases Components of Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Lessee Disclosure [Abstract]    
Operating lease expense for fixed payments $ 35 $ 108
Finance lease expense, amortization of ROU assets 7 23
Finance lease expense, interest on lease liabilities 3 10
Variable lease expense [1] $ 41 $ 123
[1] Includes amounts related to operating leases and interest payments on finance leases.