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Derivatives and Hedging Activities (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Dec. 31, 2021
Derivative [Line Items]            
Margin on interest rate swaps $ 10   $ 10     $ 11
Carrying values of hedged liabilities 7,800   7,800     13,100
Cumulative amount of fair value hedging adjustment (248)   (248)     237
Net increase (decrease) in interest expense on long term debt and other 3 $ (60) (88) $ (196)    
Fair Value Hedging | Fixed-Rate Debt Obligations            
Derivative [Line Items]            
Fixed-rate debt obligations designated in fair value hedging relationships 8,100   8,100     12,900
Net Investment Hedges            
Derivative [Line Items]            
Notional amount of derivatives 12,500   12,500     12,600
Gain (loss) on net investment hedges, net of taxes 520 155 728 53    
Reclassifications out of AOCI 0 0 0 0    
Foreign Exchange Contract | Not Designated as Hedging Instrument            
Derivative [Line Items]            
Notional amount of derivatives 19,700   19,700     $ 19,000
Foreign Exchange Contract | Other Expense | Not Designated as Hedging Instrument            
Derivative [Line Items]            
Gain (loss) in changes in fair value of derivatives not designated as hedges 23 $ (10) 10 $ (24)    
Equity Linked Embedded Derivative | Not Designated as Hedging Instrument            
Derivative [Line Items]            
Notional amount of derivatives         $ 78  
Fair value of embedded derivative asset, gross 19   19      
Equity Linked Embedded Derivative | Noninterest Income | Not Designated as Hedging Instrument            
Derivative [Line Items]            
Loss on embedded derivative $ 0   $ 4