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DERIVATIVE INSTRUMENTS - Narrative (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Derivative [Line Items]  
Derivative instruments and hedges, liabilities $ 518
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]  
Derivative [Line Items]  
Derivative, notional amount 500
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]  
Derivative [Line Items]  
Derivative, notional amount $ 34