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Borrowings (Schedule of Long-Term Borrowings) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2021
Debt Instrument [Line Items]
Long-term borrowings	$ 2,284	$ 2,407
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			1.80%
Parent Company [Member]
Debt Instrument [Line Items]
Long-term borrowings	1,786	1,909
Parent Company [Member] | Senior Notes [Member] | Two Point Two Five Percent Senior Notes Due April Two Thousand Twenty Five [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 747	746
Debt Instrument, Interest Rate, Stated Percentage	2.25%
Parent Company [Member] | Senior Notes [Member] | One point Eight Percent Senior Notes Due August Two Thousand
Debt Instrument [Line Items]
Long-term borrowings	$ 646	645
Debt Instrument, Interest Rate, Stated Percentage	1.80%
Parent Company [Member] | Subordinated Debt [Member] | Seven Point Seven Five Percent Subordinated Notes Due September Two Thousand Twenty Four [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 100	100
Debt Instrument, Interest Rate, Stated Percentage	7.75%
Parent Company [Member] | Subordinated Debt [Member] | Six Point Seven Five Percent Subordinated Debentures Due November Two Thousand Twenty Five [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 153	154
Debt Instrument, Interest Rate, Stated Percentage	6.75%
Parent Company [Member] | Subordinated Debt [Member] | Seven Point Three Seven Five Percent Subordinated Notes Due December Two Thousand Thirty Seven [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 298	298
Debt Instrument, Interest Rate, Stated Percentage	7.375%
Parent Company [Member] | Valuation Adjustments On Hedged Long Term Debt [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ (158)	(34)
Regions Bank [Member]
Debt Instrument [Line Items]
Long-term borrowings	498	498
Regions Bank [Member] | Subordinated Debt [Member] | Six Point Four Five Percent Subordinated Notes Due June Two Thousand Thirty Seven [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 496	496
Debt Instrument, Interest Rate, Stated Percentage	6.45%
Regions Bank [Member] | Other Long Term Debt [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 2	$ 2

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