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Borrowed Funds (Schedule of Long-Term Borrowings) (Details) - USD ($) $ in Millions | Sep. 06, 2034 | Jun. 06, 2029 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Long-term borrowings |  |  | $ 5,993 | $ 2,330
Parent Company |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowings |  |  | 3,495 | 1,832
Parent Company | Senior Notes | Scenario, Forecast |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-termdebtfloatingrateinterestequaltoCompoundSOFR | (2.06%) | (1.49%) |  |
Parent Company | Valuation Adjustments On Hedged Long Term Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowings |  |  | (91) | (112)
Parent Company | Two Point Two Five Percent Senior Notes Due April Two Thousand Twenty Five | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowings |  |  | $ 749 | 747
Stated interest rate |  |  | 2.25% |
Parent Company | One point Eight Percent Senior Notes Due August Two Thousand Twenty Eight | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowings |  |  | $ 647 | 646
Stated interest rate |  |  | 1.80% |
Parent Company | Five point Seven Two Two Percent Senior Note due June Two Thousand Thirty | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowings |  |  | $ 746 | 0
Stated interest rate |  |  | 5.722% |
Parent Company | Five point Five Zero Two Percent Senior Note due Septmeber Two Thousand Thirty Five | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowings |  |  | $ 994 | 0
Stated interest rate |  |  | 5.502% |
Parent Company | Seven Point Seven Five Percent Subordinated Notes Due September Two Thousand Twenty Four | Subordinated Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowings |  |  | $ 0 | 100
Stated interest rate |  |  | 7.75% |
Parent Company | Six Point Seven Five Percent Subordinated Debentures Due November Two Thousand Twenty Five | Subordinated Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowings |  |  | $ 151 | 153
Stated interest rate |  |  | 6.75% |
Parent Company | Seven Point Three Seven Five Percent Subordinated Notes Due December Two Thousand Thirty Seven | Subordinated Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowings |  |  | $ 299 | 298
Stated interest rate |  |  | 7.375% |
Regions Bank |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowings |  |  | $ 2,498 | 498
Long-Term Federal Home Loan Bank Advances |  |  | 2,000 | 0
Regions Bank | Other Long Term Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowings |  |  | 2 | 2
Regions Bank | Six Point Four Five Percent Subordinated Notes Due June Two Thousand Thirty Seven | Subordinated Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term borrowings |  |  | $ 496 | $ 496
Stated interest rate |  |  | 6.45% |

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