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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | $ 151,907 | $ 138,062
Estimated Fair Value, Gain | [1] | 2,609 | 1,111
Estimated Fair Value, Loss | [1] | 3,378 | 1,012
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements | [1],[2] | 2,504 | 699
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements | [1],[2] | 1,925 | 932
Derivative Asset | [1] | 105 | 412
Derivative Liability | [1] | 1,453 | 80
Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 32,023 | 28,550
Estimated Fair Value, Gain | [1] | 20 | 171
Estimated Fair Value, Loss | [1] | 826 | 61
Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 119,884 | 109,512
Estimated Fair Value, Gain | [1] | 2,589 | 940
Estimated Fair Value, Loss | [1] | 2,552 | 951
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 94,220 | 81,327
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value, Gain | [1] | 2,315 | 748
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value, Loss | [1] | 2,335 | 794
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 12,506 | 15,990
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value, Gain | [1] | 94 | 48
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value, Loss | [1] | 85 | 19
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 985 | 2,739
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value, Gain | [1] | 8 | 11
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value, Loss | [1] | 5 | 3
Other Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 12,173 | 9,456
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value, Gain | [1] | 172 | 133
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value, Loss | [1] | 127 | 135
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 1,423 | 7,900
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value, Gain | [1] | 1 | 0
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value, Loss | [1] | 158 | 32
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 30,600 | 20,650
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value, Gain | [1] | 19 | 171
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value, Loss | [1] | $ 668 | $ 29
[1] | Derivatives in a gain position are recorded as other assets and derivatives in a loss position are recorded as other liabilities on the consolidated balance sheets.
[2] | Netting adjustments represent amounts recorded to convert derivative assets and derivative liabilities from a gross basis to a net basis in accordance with applicable accounting guidance. The net basis takes into account the impact of cash collateral received or posted, legally enforceable master netting agreements, and variation margin that allow Regions to settle derivative contracts with the counterparty on a net basis and to offset the net position with the related cash collateral.

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