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FAIR VALUE MEASUREMENTS - Changes in Level 3 Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value as of January 1 $ 313 $ 291
Issuances 1,790 52
Settlements (34) (1)
Fair value as of March 31 $ 2,069 $ 342