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Derivative Financial Instruments and Hedging Activities (Schedule of Derivative Instruments Notional and Fair Value) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount |  | $ 126,602 |  | $ 128,614
Derivative Asset, Fair Value, Gross Asset |  | 2,061 |  | 3,349
Derivative Liability, Fair Value, Gross Liability |  | 1,254 |  | 1,598
Derivative Asset netting adjustments |  | 1,357 | [1] | 2,428
Derivative Liability, netting adjustments |  | 1,202 | [1] | 1,545
Derivative Assets | [2] | 704 |  | 921
Derivative Liabilities | [2] | 52 |  | 53
Cash Flow Hedge, Floor Premium |  | 44 |  | 83
Terminated Cash Flow Hedge Floor Premium |  | 32 |  |
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value |  | 9,800 |  | 10,300
Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount |  | 22,250 |  | 23,850
Derivative Asset, Fair Value, Gross Asset |  | 788 |  | 1,688
Derivative Liability, Fair Value, Gross Liability |  | 12 |  | 0
Not Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount |  | 104,352 |  | 104,764
Derivative Asset, Fair Value, Gross Asset |  | 1,273 |  | 1,661
Derivative Liability, Fair Value, Gross Liability |  | 1,242 |  | 1,598
Interest Rate Swaps [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Instrument, Accrued Interest |  | 21 |  | 28
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount |  | 76,721 |  | 76,764
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 1,039 | [3] | 1,492
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 1,055 | [3] | 1,464
Interest Rate Floor [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Instrument, Accrued Interest |  | 8 |  | 12
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount |  | 15,590 |  | 13,806
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | [3] | 64 |  | 90
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability | [3] | 23 |  | 28
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount |  | 2,921 |  | 4,270
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | [3] | 13 |  | 11
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability | [3] | 4 |  | 26
Other Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount |  | 9,120 |  | 9,924
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | [3] | 157 |  | 68
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability | [3] | 160 |  | 80
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount |  | 1,750 |  | 2,100
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 60 | [3] | 77
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 11 | [3] | 0
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount |  | 20,500 |  | 21,750
Derivative Asset, Fair Value, Gross Asset |  | 728 |  | 1,611
Derivative Liability, Fair Value, Gross Liability |  | 1 |  | 0
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | [4] | 17,000 |  | 16,000
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 532 | [3] | 1,181
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 1 | [3] | 0
Cash Flow Hedging [Member] | Interest Rate Floor [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Amount | [5],[6] | 3,500 |  | 5,750
Cash Flow Hedging [Member] | Interest Rate Floor [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | [3] | 196 | [5] | 430
Cash Flow Hedging [Member] | Interest Rate Floor [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 | [3],[5] | 0
US Treasury Securities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value |  | $ 24 |  | $ 24
[1] | 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.
[2] | The gain amounts, which are not collateralized with cash or other assets or reserved for, represent the net credit risk on all trading and other derivative positions. As of June 30, 2021 and December 31, 2020, financial instruments posted of $24 million, for both periods, were not offset in the consolidated balance sheets.
[3] | 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.
[4] | Includes accrued interest of $21 million at June 30, 2021 and $28 million at December 31, 2020, respectively.
[5] | Estimated fair value includes premium of approximately $44 million as of June 30, 2021 and $83 million as of December 31, 2020 to be amortized over the remaining life. Approximately $32 million of the decrease since December 31, 2020 related to hedges that were terminated during the first six months of 2021 and were not amortized into earnings as of the date of termination.
[6] | Includes accrued interest of $8 million at June 30, 2021 and $12 million at December 31, 2020, respectively

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