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Investment Securities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]      
Net unsettled investment purchases $ 200.0 $ 200.0 $ 800.0
Transferred securities at fair value from available for sale to held to maturity 82,700.0 82,700.0  
Unrealized losses related to transfers 5,100.0 5,100.0  
Investment securities, allowance for credit loss 149.0 149.0 $ 133.0
Pretax loss from derivatives 314.0 314.0  
US Treasury and Government [Member]      
Schedule of Investments [Line Items]      
Transferred securities at fair value from available for sale to held to maturity 34,000.0    
Residential mortgage-backed Securities | Mortgage-backed Securities Agency      
Schedule of Investments [Line Items]      
Transferred securities at fair value from available for sale to held to maturity 39,000.0    
Asset-backed Securities      
Schedule of Investments [Line Items]      
Transferred securities at fair value from available for sale to held to maturity   6,300.0  
Other debt      
Schedule of Investments [Line Items]      
Transferred securities at fair value from available for sale to held to maturity   3,400.0  
Federal National Mortgage Association Certificates and Obligations (FNMA)      
Schedule of Investments [Line Items]      
Amortized cost of debt securities of a single issuer that exceeds 10 percent of shareholders equity 39,600.0 39,600.0  
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity 36,400.0 36,400.0  
Federal Home Loan Mortgage Corp (FHLMC)      
Schedule of Investments [Line Items]      
Amortized cost of debt securities of a single issuer that exceeds 10 percent of shareholders equity 33,000.0 33,000.0  
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity $ 30,500.0 $ 30,500.0