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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, gross $ 105 $ 43
Total fair value of derivative liabilities, gross 99 226
Margin on interest rate swaps 17 20
Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative asset and derivative liability netting, other assets (36) (27)
Total derivative assets, net 69 16
Other Assets [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total fair value of derivative assets, gross 43 12
Other Assets [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total fair value of derivative assets, gross 0 0
Other Assets [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total fair value of derivative assets, gross 43 12
Other Assets [Member] | Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total fair value of derivative assets, gross 62 31
Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative asset and derivative liability netting, other liabilities (36) (27)
Total derivative liabilities, net 63 199
Other Liabilities [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total fair value of derivative liabilities, gross 60 44
Other Liabilities [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total fair value of derivative liabilities, gross 0 0
Other Liabilities [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total fair value of derivative liabilities, gross 60 44
Other Liabilities [Member] | Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total fair value of derivative liabilities, gross $ 39 $ 182