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Leases - Supplemental Cash Flow Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities  
Operating cash flows from operating leases $ 28
Operating cash flows from finance leases 0
Financing cash flows from finance leases 5
Right-of-use assets obtained in exchange for lease liabilities  
Operating leases 24
Finance leases $ 9