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Derivatives and Hedging Activities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Total fair value of derivative assets $ 879 $ 343
Total fair value of derivative liabilities 316 440
Derivative asset and derivative liability netting, assets (158) (90)
Derivative asset and derivative liability netting, liabilities (158) (90)
Margin on interest rate swaps 42 47
Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Total derivatives assets, net 155 68
Cash collateral netting, assets (566) (185)
Other Assets [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total fair value of derivative assets 715 209
Other Assets [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total derivatives assets, net 565 185
Other Assets [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total derivatives assets, net 150 24
Other Assets [Member] | Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total fair value of derivative assets 164 134
Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total derivative liabilities, net 141 341
Cash collateral netting, liabilities (17) (9)
Other Liabilities [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total fair value of derivative liabilities 134 186
Other Liabilities [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total derivative liabilities, net 0 0
Other Liabilities [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total derivative liabilities, net 134 186
Other Liabilities [Member] | Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total fair value of derivative liabilities $ 182 $ 254