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Investment Securities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Schedule of Investments [Line Items]          
Net unsettled investment purchases $ 400.0   $ 400.0   $ 300.0
Transferred securities at fair value from available for sale to held to maturity 59,100.0 $ 18,700.0 77,800.0    
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 137.0   137.0 $ 133.0  
Pretax loss included in AOCI from derivatives (141.0)   (141.0)    
U.S. Treasury and government agencies          
Schedule of Investments [Line Items]          
Transferred securities at fair value from available for sale to held to maturity 21,500.0 9,200.0      
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 27,900.0 $ 9,500.0      
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 36,500.0   36,500.0    
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity 35,000.0   35,000.0    
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 28,500.0   28,500.0    
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity $ 27,400.0   $ 27,400.0