Regulatory Capital and Other Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2020

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 the U.S. Basel III capital framework.

	December 31, 2020				December 31, 2019				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.	$	14,878	10.64	%	$	13,837	9.54	%	4.50	%	(b)
Ally Bank	17,567		13.38		16,627		12.30		4.50		6.50	%
Tier 1 (to risk-weighted assets)
Ally Financial Inc.	$	17,289	12.37	%	$	16,271	11.22	%	6.00	%	6.00	%
Ally Bank	17,567		13.38		16,627		12.30		6.00		8.00
Total (to risk-weighted assets)
Ally Financial Inc.	$	19,778	14.15	%	$	18,506	12.76	%	8.00	%	10.00	%
Ally Bank	19,210		14.63		17,854		13.21		8.00		10.00
Tier 1 leverage (to adjusted quarterly average assets) (c)
Ally Financial Inc.	$	17,289	9.41	%	$	16,271	9.08	%	4.00	%	(b)
Ally Bank	17,567		10.12		16,627		10.01		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 was required to maintain a minimum capital conservation buffer of 3.5% and 2.5% at December 31, 2020, and December 31, 2019, respectively, and Ally Bank was required to maintain a minimum capital conservation buffer of 2.5% at both December 31, 2020, and December 31, 2019.

(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 over the last eight quarters.

	Common stock repurchased during period (a) (b)			Number of common shares outstanding		Cash dividends declared per common share (c)
($ in millions, except per share data; shares in thousands)	Approximate dollar value		Number of shares	Beginning of period	End of period
2019
First quarter	$	211	8,113	404,900	399,761	$	0.17
Second quarter	229		7,775	399,761	392,775	0.17
Third quarter	300		9,287	392,775	383,523	0.17
Fourth quarter	299		9,554	383,523	374,332	0.17
2020
First quarter	$	104	3,838	374,332	373,155	$	0.19
Second quarter	—		53	373,155	373,837	0.19
Third quarter	1		9	373,837	373,857	0.19
Fourth quarter	1		37	373,857	374,674	0.19

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

(b)On March 17, 2020, we announced the voluntary suspension of our stock-repurchase program through its termination on June 30, 2020. Consistent with the FRB’s restrictions on common-stock repurchases for large firms such as Ally, described below, we did not implement a new stock-repurchase program or repurchase shares of our common stock, except in connection with compensation plans, for the remainder of 2020. Refer to the discussion below for further details about this action.

(c)On January 11, 2021, our Board declared a quarterly cash dividend of $0.19 per share on all common stock, payable on February 12, 2021, to stockholders of record at the close of business on February 1, 2021. Refer to Note 31 for further information regarding this common stock dividend.