Regulatory Capital (Tables)

6 Months Ended

Jun. 30, 2012

Regulatory Capital Requirements [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

The following table summarizes our capital ratios.

	June 30, 2012				December 31, 2011				Required minimum			Well-capitalized minimum
($ in millions)	Amount		Ratio		Amount		Ratio
Risk-based capital
Tier 1 (to risk-weighted assets)
Ally Financial Inc.	$	20,235	13.68	%	$	21,158	13.71	%	4.00	%		6.00%
Ally Bank	13,502		16.82		12,953		17.42		4.00			6.00
Total (to risk-weighted assets)
Ally Financial Inc.	$	21,738	14.70	%	$	22,755	14.75	%	8.00	%		10.00%
Ally Bank	14,333		17.85		13,675		18.40		8.00			10.00
Tier 1 leverage (to adjusted quarterly average assets) (a)
Ally Financial Inc.	$	20,235	10.99	%	$	21,158	11.50	%	3.00–4.00%			(b)
Ally Bank	13,502		15.49		12,953		15.50		15.00		(c)	5.00%
Tier 1 common (to risk-weighted assets)
Ally Financial Inc.	$	10,752	7.27	%	$	11,676	7.57	%	n/a			n/a
Ally Bank	n/a		n/a		n/a		n/a		n/a			n/a

n/a = not applicable

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

(b) There is no Tier 1 leverage component in the definition of a well-capitalized bank holding company.

(c) Ally Bank, in accordance with the CLMA, is required to maintain a Tier 1 leverage ratio of at least 15%.