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Regulatory Capital (Tables)
 12 Months Ended
Dec. 31, 2013
Regulatory Capital Requirements [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
The following table summarizes our capital ratios.
 
2013
 
2012
 
Required
minimum
 
Well-capitalized
minimum
December 31, ($ in millions)
Amount
 
Ratio
 
Amount
 
Ratio
 
Risk-based capital
 
 
 
 
 
 
 
 
 
 
 
Tier 1 (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
Ally Financial Inc.
$
15,165

 
11.79
%
 
$
20,232

 
13.13
%
 
4.00
%
 
6.00
%
Ally Bank
15,159

 
16.73

 
14,136

 
16.26

 
4.00

  
6.00

Total (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
Ally Financial Inc.
$
16,405

 
12.76
%
 
$
21,669

 
14.07
%
 
8.00
%
 
10.00
%
Ally Bank
15,809

 
17.45

 
14,827

 
17.06

 
8.00

  
10.00

Tier 1 leverage (to adjusted quarterly average assets) (a)
 
 
 
 
 
 
 
 
 
 
 
Ally Financial Inc.
$
15,165

 
10.23
%
 
$
20,232

 
11.16
%
 
3.00–4.00%

 
(b)

Ally Bank
15,159

 
15.77

 
14,136

 
15.30

 
15.00

(c) 
5.00
%
Tier 1 common (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
Ally Financial Inc.
$
11,366

 
8.84
%
 
$
10,749

 
6.98
%
 
n/a

  
n/a

Ally Bank
15,159

 
16.73

 
14,136

 
16.26

 
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)
Currently, there is no Tier 1 leverage component in the definition of "well-capitalized" for a bank holding company.
(c)
Ally Bank, in accordance with the CLMA, is required to maintain a Tier 1 leverage ratio of at least 15%.