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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 |  |

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