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REVENUES - Lease Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]        
Sales-type lease revenue $ 3 $ 11 $ 19 $ 27
Operating lease revenue 21 16 90 44
Variable lease revenue 27 19 59 57
Total lease revenue $ 51 $ 46 $ 168 $ 128