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v3.22.4

Borrowings (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Dec. 31, 2022 USD ($) agreement | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | $ 0 | $ 20 | $ 22
Debt, Weighted Average Interest Rate |  | 5.10% | 3.60% | 2.70%
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.80% |  |  |
Proceeds from Issuance of Debt | $ 650 |  |  |
Minimum [Member] | Subordinated Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.45% |  |
Maximum [Member] | Subordinated Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.75% |  |
Parent Company [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | $ 0 | $ 20 | $ 14
Parent Company [Member] | Subordinated Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number Of Issuances Of Debt | agreement |  | 3 |  |
Subordinated Debt |  | $ 551 |  |
Regions Bank [Member] | Subordinated Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number Of Issuances Of Debt | agreement |  | 1 |  |
Subordinated Debt |  | $ 496 |  |

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