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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
Leases [Abstract]    
Operating lease expense $ 9 $ 26
Finance lease expense:    
Amortization of right-of-use (“ROU”) assets 4 12
Interest on lease liabilities 3 11
Total finance lease expense $ 7 $ 23