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Lessee, Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating cash flows for operating leases $ 12 $ 19
Financing cash flows for finance leases $ 1 $ 2