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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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Contractual interest rate for funds borrowed, under the debt agreement.

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