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Leases - Lessor Rental Revenue for Operating Leases (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Leases [Abstract]        
Rental revenue $ 22 $ 7 $ 52 $ 27