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Leases - Supplemental Cash Flow Information Related to Leases (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Leases [Abstract]  
Operating cash flows from operating leases $ 27
Operating cash flows from finance leases 1
Financing cash flows from finance leases 14
Right-of-use assets obtained in exchange for lease obligations, operating leases $ 13