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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 |

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