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Revenues - Lease Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]        
Sales-type lease revenue $ 10 $ 5 $ 16 $ 11
Operating lease revenue 14 15 28 30
Variable lease revenue 20 21 38 42
Total lease revenue $ 44 $ 41 $ 82 $ 83