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Servicing Activities (Tables)
 3 Months Ended
Mar. 31, 2013
Servicing Activities [Abstract]  
Schedule of Servicing Assets at Fair Value [Table Text Block]
The following table summarizes activity related to MSRs, which are carried at fair value. Management estimates fair value using our transaction data and other market data or, in periods when there are limited MSRs market transactions that are directly observable, internally developed discounted cash flow models (an income approach) are used to estimate the fair value. These internal valuation models estimate net cash flows based on internal operating assumptions that we believe would be used by market participants in orderly transactions combined with market-based assumptions for loan prepayment rates, interest rates, and discount rates that we believe approximate yields required by investors in this asset.
Three months ended March 31, ($ in millions)
 
2013 (a)(b)

 
2012 (c)
Estimated fair value at January 1,
 
$
952

 
$
2,519

Additions recognized on sale of mortgage loans
 
54

 
75

Changes in fair value
 
 
 
 
Due to changes in valuation inputs or assumptions used in the valuation model
 
(28
)
 
163

Other changes in fair value
 
(61
)
 
(162
)
Estimated fair value at March 31,
 
$
917

 
$
2,595


(a)
The remaining balance is at Ally Bank, due to the deconsolidation of ResCap.
(b)
In April 2013, we sold our agency MSRs portfolio. Refer to Note 27 for further details.
(c)
Includes activities of our discontinued operations.
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block]
The key economic assumptions and sensitivity of the fair value of MSRs to immediate 10% and 20% adverse changes in those assumptions were as follows.
($ in millions)
 
March 31, 2013
 
December 31, 2012
Weighted average life (in years)
 
5.4

 
4.6

Weighted average prepayment speed
 
10.3
%
 
13.5
%
Impact on fair value of 10% adverse change
 
$
(64
)
 
$
(77
)
Impact on fair value of 20% adverse change
 
(122
)
 
(144
)
Weighted average discount rate
 
9.3
%
 
7.7
%
Impact on fair value of 10% adverse change
 
$
(42
)
 
$
(10
)
Impact on fair value of 20% adverse change
 
(80
)
 
(19
)
Components Of Servicing Valuation And Hedge Activities [Table Text Block]
The components of servicing valuation and hedge activities, net, were as follows.
 
Three months ended March 31,
 ($ in millions)
2013
 
2012
Change in estimated fair value of mortgage servicing rights
$
(89
)
 
$
(10
)
Change in fair value of derivative financial instruments
(112
)
 
(96
)
Servicing asset valuation and hedge activities, net
$
(201
)
 
$
(106
)
Components Of Mortgage Servicing Fees [Table Text Block]
The components of mortgage servicing fees were as follows.
 
Three months ended March 31,
($ in millions)
2013
 
2012
Contractual servicing fees, net of guarantee fees and including subservicing
$
58

 
$
86

Late fees
1

 
2

Ancillary fees
4

 
4

Total mortgage servicing fees
$
63

 
$
92
Schedule Of Unpaid Principal Balance Of Serviced Mortgage Assets [Table Text Block]
The unpaid principal balance of our serviced mortgage assets were as follows.
($ in millions)
 
March 31, 2013
 
December 31, 2012
On-balance sheet mortgage loans
 
 
 
 
Held-for-sale and investment
 
$
9,208

 
$
10,938

Off-balance sheet mortgage loans
 
 
 
 
Loans sold to third-party investors
 
 
 
 
GSEs
 
117,675

 
119,384

Whole-loan
 
2

 
2

Total primary serviced mortgage loans (a)
 
$
126,885

 
$
130,324

(a)
In April 2013, we sold our agency MSRs portfolio, refer to Note 27 for further details.
Schedule Of Total Serviced Automobile Loans Outstanding [Table Text Block]
The total serviced automobile finance loans outstanding were as follows.
($ in millions)
 
March 31, 2013
 
December 31, 2012
On-balance sheet automobile finance loans and leases
 
 
 
 
Consumer automobile
 
$
55,014

 
$
53,715

Commercial automobile
 
31,875

 
32,822

Operating leases
 
14,828

 
13,550

Operations held-for-sale
 
15,304

 
25,979

Other
 
45

 
41

Off-balance sheet automobile finance loans
 
 
 
 
Loans sold to third-party investors
 
 
 
 
Securitizations
 
1,317

 
1,474

Whole-loan
 
5,374

 
6,541

Other (a)
 
9,060

 
—

Total serviced automobile finance loans and leases
 
$
132,817

 
$
134,122