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Borrowings (Schedule of Maturities of Long-Term Borrowings) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Schedule of Maturities of Long-Term Debt [Line Items]
Long-term borrowings	$ 2,330	$ 2,284
Parent Company [Member]
Schedule of Maturities of Long-Term Debt [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	100
Long-term Debt, Maturities, Repayments of Principal in Year Two	859
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	575
Long-term Debt, Maturities, Repayments of Principal after Year Five	298
Long-term borrowings	1,832	1,786
Regions Bank [Member]
Schedule of Maturities of Long-Term Debt [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	0
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	498
Long-term borrowings	$ 498	$ 498

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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