Regulatory Capital and Other Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2023

Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations

The following table summarizes our capital ratios under U.S. Basel III.

	December 31, 2023				December 31, 2022				Required minimum (a)		Well-capitalized minimum
($ in millions)	Amount		Ratio		Amount		Ratio
Capital ratios
Common Equity Tier 1 (to risk-weighted assets)
Ally Financial Inc.	$	15,129	9.36	%	$	14,592	9.27	%	4.50	%	(b)
Ally Bank	17,217		11.24		17,011		11.38		4.50		6.50	%
Tier 1 (to risk-weighted assets)
Ally Financial Inc.	$	17,392	10.76	%	$	16,867	10.72	%	6.00	%	6.00	%
Ally Bank	17,217		11.24		17,011		11.38		6.00		8.00
Total (to risk-weighted assets)
Ally Financial Inc.	$	20,055	12.41	%	$	19,209	12.21	%	8.00	%	10.00	%
Ally Bank	19,144		12.50		18,888		12.64		8.00		10.00
Tier 1 leverage (to adjusted quarterly average assets) (c)
Ally Financial Inc.	$	17,392	8.67	%	$	16,867	8.65	%	4.00	%	(b)
Ally Bank	17,217		9.07		17,011		9.23		4.00		5.00	%

(a)In addition to the minimum risk-based capital requirements for the Common Equity Tier 1 capital, Tier 1 capital, and total capital ratios, Ally and Ally Bank were required to maintain a minimum capital conservation buffer of 2.5% at both December 31, 2023, and December 31, 2022.

(b)Currently, there is no ratio component for determining whether a BHC is “well-capitalized.”

(c)Federal regulatory reporting guidelines require the calculation of adjusted quarterly average assets using a daily average methodology.

Schedule of Common Share Distribution Activity

The following table presents information related to our common stock and distributions to our common stockholders.

	Common stock repurchased during period (a)			Number of common shares outstanding		Cash dividends declared per common share (b)
($ in millions, except per share data; shares in thousands)	Approximate dollar value		Number of shares	Beginning of period	End of period
2022
First quarter	$	584	12,548	337,941	327,306	$	0.30
Second quarter	600		15,031	327,306	312,781	0.30
Third quarter	415		12,468	312,781	300,335	0.30
Fourth quarter	51		1,731	300,335	299,324	0.30
2023
First quarter	$	27	836	299,324	300,821	$	0.30
Second quarter	2		58	300,821	301,619	0.30
Third quarter	—		5	301,619	301,630	0.30
Fourth quarter	4		145	301,630	302,459	0.30

(a)Includes shares of common stock withheld to cover income taxes owed by participants in our share-based incentive plans.

(b)On January 11, 2024, our Board declared a quarterly cash dividend of $0.30 per share on all common stock. The dividend was paid on February 15, 2024, to stockholders of record at the close of business on February 1, 2024.