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Investment Securities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Schedule of Investments [Line Items]        
Net unsettled investment purchases $ 2,000.0 $ 2,000.0   $ 2,400.0
Transferred securities at fair value from available for sale to held to maturity 4,900.0 82,700.0    
Net unrealized losses, related to securities transferred at fair value to held to maturity at a point in time 5,400.0 5,400.0    
Investment securities, allowance for credit loss 140.0 140.0 $ 133.0  
Pretax loss included in AOCI from derivatives (132.0) (132.0)    
U.S. Treasury and government agencies        
Schedule of Investments [Line Items]        
Transferred securities at fair value from available for sale to held to maturity 3,300.0 34,000.0    
Asset-backed        
Schedule of Investments [Line Items]        
Transferred securities at fair value from available for sale to held to maturity   6,300.0    
Other        
Schedule of Investments [Line Items]        
Transferred securities at fair value from available for sale to held to maturity   3,400.0    
Mortgage-backed Securities Agency | Residential mortgage-backed        
Schedule of Investments [Line Items]        
Transferred securities at fair value from available for sale to held to maturity 1,600.0 39,000.0    
Federal National Mortgage Association Certificates and Obligations (FNMA)        
Schedule of Investments [Line Items]        
Debt securities amortized cost amount of debt securities exceeds 10 percent of shareholders equity 38,300.0 38,300.0    
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity 34,600.0 34,600.0    
Federal Home Loan Mortgage Corporation (FHLMC) Insured Loans        
Schedule of Investments [Line Items]        
Debt securities amortized cost amount of debt securities exceeds 10 percent of shareholders equity 30,700.0 30,700.0    
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity $ 27,900.0 $ 27,900.0