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REVENUES - Lease Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]        
Sales-type lease revenue $ 10 $ 10 $ 16 $ 16
Operating lease revenue 35 14 69 28
Variable lease revenue 15 20 32 38
Total lease revenue $ 60 $ 44 $ 117 $ 82