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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Amounts Recorded on Balance Sheet Related to Fixed-to-Floating Interest Rate Swaps (Details) - Long-term debt
$ in Millions
Jun. 30, 2019
USD ($)
Derivative [Line Items]  
Discontinued hedge, cumulative adjustment $ 42
Interest Rate Swap  
Derivative [Line Items]  
Carrying amount of the hedged assets (liabilities) (2,838)
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged asset (liabilities) $ (100)