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DEBT - Net Deferred Gain and Issuance Costs (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Deferred gain $ 193 $ 211
Issuance costs and original issue discounts (58) (65)
Net deferred gain and issuance costs $ 135 $ 146