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Servicing Activities (Tables)
 9 Months Ended
Sep. 30, 2012
Servicing Activities [Abstract]  
Schedule of Servicing Assets at Fair Value [Table Text Block]
Nine months ended September 30, ($ in millions)
 
2012 (a)

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

 
$
3,738

Additions recognized on sale of mortgage loans
 
167

 
487

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
 
(330
)
 
(943
)
   Other changes in fair value
 
(324
)
 
(384
)
Deconsolidation of ResCap
 
(1,130
)
 
—

Estimated fair value at September 30,
 
$
902

 
$
2,663

(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. Refer to Note 1 for more information.
The following tables summarize activity related to MSRs, which are carried at fair value. As MSRs do not trade in an active market with observable prices, 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.
Three months ended September 30, ($ in millions)
 
2012 (a)

 
2011
Estimated fair value at July 1,
 
$
1,105

 
$
3,701

Additions recognized on sale of mortgage loans
 
50

 
159

Additions from purchases of servicing rights
 
—

 
15

Changes in fair value
 
 
 
 
Due to changes in valuation inputs or assumptions used in the valuation model
 
(192
)
 
(1,106
)
   Other changes in fair value
 
(61
)
 
(106
)
Estimated fair value at September 30,
 
$
902

 
$
2,663

(a)
The balance is at Ally Bank.
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)
 
September 30, 2012
 
December 31, 2011
Weighted average life (in years)
 
4.1

 
4.7

Weighted average prepayment speed
 
17.0
%
 
15.7
%
Impact on fair value of 10% adverse change
 
$
(81
)
 
$
(135
)
Impact on fair value of 20% adverse change
 
(152
)
 
(257
)
Weighted average discount rate
 
5.9
%
 
10.2
%
Impact on fair value of 10% adverse change
 
$
(7
)
 
$
(59
)
Impact on fair value of 20% adverse change
 
(12
)
 
(114
)
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 September 30,
 
Nine months ended September 30,
($ in millions)
 
2012
 
2011
 
2012
 
2011
Change in estimated fair value of mortgage servicing rights
 
$
(253
)
 
$
(1,212
)
 
$
(654
)
 
$
(1,327
)
Change in fair value of derivative financial instruments
 
387

 
741

 
724

 
664

Servicing asset valuation and hedge activities, net
 
$
134

 
$
(471
)
 
$
70

 
$
(663
)
Components Of Mortgage Servicing Fees [Table Text Block]
The components of mortgage servicing fees were as follows.
 
 
Three months ended September 30,
 
Nine months ended September 30,
($ in millions)
 
2012
 
2011
 
2012
 
2011
Contractual servicing fees, net of guarantee fees and including subservicing
 
$
59

 
$
241

 
$
446

 
$
743

Late fees
 
3

 
11

 
28

 
49

Ancillary fees
 
3

 
44

 
57

 
115

Total mortgage servicing fees
 
$
65

 
$
296

 
$
531

 
$
907
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)
 
September 30, 2012 (a)
 
December 31, 2011
On-balance sheet mortgage loans
 
 
 
 
Held-for-sale and investment
 
$
10,208

 
$
18,871

Operations held-for-sale
 
—

 
541

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

 
50,886

GSEs
 
122,892

 
262,868

Whole-loan
 
8

 
15,105

Purchased servicing rights
 
—

 
3,247

Operations held-for-sale
 
—

 
4,912

Total primary serviced mortgage loans
 
133,108

 
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
 
$
133,108

 
$
391,349

(a)
The remaining balances were 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. Refer to Note 1 for more information.
Schedule Of Total Serviced Automobile Loans Outstanding [Table Text Block]
The total serviced automobile loans outstanding were as follows.
($ in millions)
 
September 30, 2012
 
December 31, 2011
On-balance sheet automobile loans and leases
 
 
 
 
Consumer automobile
 
$
70,847

 
$
63,884

Commercial automobile
 
37,381

 
37,302

Operating leases
 
12,708

 
9,275

Operations held-for-sale
 
27

 
102

Off-balance sheet automobile loans
 
 
 
 
Loans sold to third-party investors
 
 
 
 
Securitizations
 
1,639

 
—

Whole-loan
 
7,864

 
12,318

Total serviced automobile loans and leases
 
$
130,466

 
$
122,881