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Derivatives and Hedging Activities Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Cash flow hedge gain (loss) to be reclassified within twelve months $ 2,000,000      
Derivative, collateral, right to reclaim cash 15,000,000      
Credit risk derivatives, at fair value, net $ 5,000,000     $ 1,000,000
Interest Rate Contract [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]        
Terminated derivative notional amount     $ 700,000,000  
Terminated derivative, fair value, net     $ 85,000,000  
Interest Rate Contract [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument [Member]        
Terminated derivative notional amount   $ 475,000,000    
Terminated derivative, fair value, net   $ 33,000,000