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Leases Lessee Disclosure - Lease Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Lease Costs    
Operating lease costs $ 41 $ 83
Amortization of leased assets 4 7
Interest on lease liabilities 1 1
Other lease costs (1) 6 13
Impairment loss 1 2
Less: Sublease income, gross 0 1
Net lease cost $ 53 $ 105