Regulatory Capital and Other Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2019

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, 2019				December 31, 2018				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.	$	13,837	9.54	%	$	13,397	9.14	%	4.50	%	(b)
Ally Bank	16,627		12.30		16,552		12.61		4.50		6.50	%
Tier 1 (to risk-weighted assets)
Ally Financial Inc.	$	16,271	11.22	%	$	15,831	10.80	%	6.00	%	6.00	%
Ally Bank	16,627		12.30		16,552		12.61		6.00		8.00
Total (to risk-weighted assets)
Ally Financial Inc.	$	18,506	12.76	%	$	18,046	12.31	%	8.00	%	10.00	%
Ally Bank	17,854		13.21		17,620		13.42		8.00		10.00
Tier 1 leverage (to adjusted quarterly average assets) (c)
Ally Financial Inc.	$	16,271	9.08	%	$	15,831	9.00	%	4.00	%	(b)
Ally Bank	16,627		10.01		16,552		10.69		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% and 1.875% at December 31, 2019, and December 31, 2018, respectively.

(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 Repurchase 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)			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
2018
First quarter	$	185	6,473	437,054	432,691	$	0.13
Second quarter	195		7,280	432,691	425,752	0.13
Third quarter	250		9,194	425,752	416,591	0.15
Fourth quarter	309		12,121	416,591	404,900	0.15
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

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

(b)

On January 13, 2020, the Ally Board of Directors (our Board) declared a quarterly cash dividend of $0.19 per share on all common stock, payable on February 14, 2020. Refer to Note 31 for further information regarding this common stock dividend.