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Servicing Activities (Tables)
 12 Months Ended
Dec. 31, 2012
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. As there are limited MSR market transactions that are directly observable, management estimates fair value using internally developed discounted cash flow models (an income approach) 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.
Year ended December 31, ($ in millions)
 
2012 (a)

 
2011
Estimated fair value at January 1,
 
$
2,519

 
$
3,738

Additions recognized on sale of mortgage loans
 
240

 
622

Additions from purchases of servicing rights
 
—

 
31

Subtractions from sales of servicing assets
 
—

 
(266
)
Changes in fair value
 
 
 
 
Due to changes in valuation inputs or assumptions used in the valuation model
 
(282
)
 
(1,041
)
   Other changes in fair value
 
(395
)
 
(565
)
Deconsolidation of ResCap
 
(1,130
)
 
—

Estimated fair value at December 31,
 
$
952

 
$
2,519


(a)
The remaining balance is at Ally Bank, due to the deconsolidation of ResCap. Ally Bank announced that it has begun to explore strategic alternatives for its agency MSR portfolio.
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.
December 31, ($ in millions)
 
2012
 
2011
Weighted average life (in years)
 
4.6

 
4.7

Weighted average prepayment speed
 
13.5
%
 
15.7
%
Impact on fair value of 10% adverse change
 
$
(77
)
 
$
(135
)
Impact on fair value of 20% adverse change
 
(144
)
 
(257
)
Weighted average discount rate
 
7.7
%
 
10.2
%
Impact on fair value of 10% adverse change
 
$
(10
)
 
$
(59
)
Impact on fair value of 20% adverse change
 
(19
)
 
(114
)
Components Of Servicing Valuation And Hedge Activities [Table Text Block]
The components of servicing valuation and hedge activities, net, were as follows.
Year ended December 31, ($ in millions)
2012
 
2011
 
2010
Change in estimated fair value of mortgage servicing rights
$
(677
)
 
$
(1,606
)
 
$
(872
)
Change in fair value of derivative financial instruments
669

 
817

 
478

Servicing asset valuation and hedge activities, net
$
(8
)
 
$
(789
)
 
$
(394
)
Components Of Mortgage Servicing Fees [Table Text Block]
The components of mortgage servicing fees were as follows.
Year ended December 31, ($ in millions)
2012
 
2011
 
2010
Contractual servicing fees, net of guarantee fees and including subservicing
$
504

 
$
977

 
$
998

Late fees
29

 
65

 
77

Ancillary fees
59

 
156

 
187

Total mortgage servicing fees
$
592

 
$
1,198

 
$
1,262
Schedule Of Unpaid Principal Balance Of Serviced Mortgage Assets [Table Text Block]
The unpaid principal balance of our serviced mortgage assets were as follows.
December 31, ($ in millions)
 
2012 (a)
 
2011
On-balance sheet mortgage loans
 
 
 
 
Held-for-sale and investment
 
$
10,938

 
$
18,871

Operations held-for-sale
 
—

 
541

Off-balance sheet mortgage loans
 
 
 
 
Loans sold to third-party investors
 
 
 
 
Private-label
 
—

 
50,886

GSEs
 
119,384

 
262,868

Whole-loan
 
2

 
15,105

Purchased servicing rights
 
—

 
3,247

Operations held-for-sale
 
—

 
4,912

Total primary serviced mortgage loans
 
130,324

 
356,430

Subserviced mortgage loans
 
—

 
26,358

Subserviced operations held-for-sale
 
—

 
4

Total subserviced mortgage loans
 
—

 
26,362

Master-servicing-only mortgage loans
 
—

 
8,557

Total serviced mortgage loans
 
$
130,324

 
$
391,349

(a)
The remaining balances were serviced by Ally Bank, due to the deconsolidation of ResCap. Ally Bank announced that it has begun to explore strategic alternatives for its agency MSR portfolio.
Schedule Of Total Serviced Automobile Loans Outstanding [Table Text Block]
The total serviced automobile finance loans outstanding were as follows.
December 31, ($ in millions)
 
2012
 
2011
On-balance sheet automobile finance loans and leases
 
 
 
 
Consumer automobile
 
$
53,715

 
$
63,884

Commercial automobile
 
32,822

 
37,302

Operating leases
 
13,550

 
9,275

Operations held-for-sale
 
25,979

 
102

Other
 
41

 
—

Off-balance sheet automobile finance loans
 
 
 
 
Loans sold to third-party investors
 
 
 
 
Securitizations
 
1,474

 
—

Whole-loan
 
6,541

 
12,318

Total serviced automobile finance loans and leases
 
$
134,122

 
$
122,881