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Recent Accounting Pronouncements - Supplemental Cash Flow Information Related to Leases (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Cash paid for the amounts included in the measurement of lease liabilities:  
Operating cash flows from operating leases $ (30)
Financing cash flow from finance leases (3)
Supplemental non-cash information on right of use assets obtained in exchange for new lease obligations:, operating leases $ 6