Ally Financial (ALLY) 10-K 3 Mar 14 2013 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 28, 2014	Jun. 30, 2012
Document And Entity Information [Abstract]	'	'	'
Entity Registrant Name	'Ally Financial Inc.	'	'
Entity Central Index Key	'0000040729	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Filer Category	'Non-accelerated Filer	'	'
Document Type	'10-K	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Amendment Flag	'false	'	'
Entity Common Stock, Shares Outstanding	'	1,547,637	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Public Float	'	'	$0

Consolidated_Statement_of_Inco

Consolidated Statement of Income (USD $)

3 Months Ended

12 Months Ended

In Millions, except Share data, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Financing Revenue and Other Interest Income [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Interest and fees on finance receivables and loans

'

'

'

'

'

'

'

'

$4,529

$4,539

$4,189

Interest on loans held-for-sale

'

'

'

'

'

'

'

'

20

98

180

Interest on trading assets

'

'

'

'

'

'

'

'

0

10

8

Interest and dividends on available-for-sale investment securities

'

'

'

'

'

'

'

'

325

292

350

Interest-bearing cash

'

'

'

'

'

'

'

'

10

24

15

Operating leases

'

'

'

'

'

'

'

'

3,209

2,379

1,929

Total financing revenue and other interest income

'

'

'

'

'

'

'

'

8,093

7,342

6,671

Interest Expense [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Interest on deposits

'

'

'

'

'

'

'

'

654

645

615

Interest on short-term borrowings

'

'

'

'

'

'

'

'

63

71

61

Interest on long-term debt

'

'

'

'

'

'

'

'

2,602

3,336

3,930

Total interest expense

'

'

'

'

'

'

'

'

3,319

4,052

4,606

Depreciation expense on operating lease assets

'

'

'

'

'

'

'

'

1,995

1,399

941

Net financing revenue (loss)

774

737

628

640

611

472

457

351

2,779

1,891

1,124

Other revenue [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Servicing fees

'

'

'

'

'

'

'

'

126

409

525

Servicing asset valuation and hedge activities, net

'

'

'

'

'

'

'

'

-213

-4

-434

Total servicing income, net

'

'

'

'

'

'

'

'

-87

405

91

Insurance premiums and service revenue earned

'

'

'

'

'

'

'

'

1,012

1,055

1,153

Gain (loss) on mortgage and automotive loans, net

'

'

'

'

'

'

'

'

55

379

229

Gain (loss) on extinguishment of debt

'

'

'

'

'

'

'

'

-59

-148

-64

Other gain (loss) on investments, net

'

'

'

'

'

'

'

'

180

146

258

Other income, net of losses

'

'

'

'

'

'

'

'

383

737

621

Total other revenue

325

371

402

386

480

775

714

605

1,484

2,574

2,288

Total net revenue (loss)

1,099

1,108

1,030

1,026

1,091

1,247

1,171

956

4,263

4,465

3,412

Provision for loan losses

140

141

89

131

93

105

33

98

501

329

161

Noninterest Expense [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Compensation and benefits expense

'

'

'

'

'

'

'

'

1,019

1,106

993

Insurance losses and loss adjustment expenses

'

'

'

'

'

'

'

'

405

454

452

Other operating expenses

'

'

'

'

'

'

'

'

1,981

2,062

1,983

Total noninterest expense

884

762

801

958

951

845

971

855

3,405

3,622

3,428

Income (loss) from continuing operations before income tax expense

75

205

140

-63

47

297

167

3

357

514

-177

Income tax expense (benefit) from continuing operations

-4

28

40

-123

-887

46

-16

1

-59

-856

42

Net income (loss) from continuing operations

79

177

100

60

934

251

183

2

416

1,370

-219

Income (loss) from discontinued operations, net of tax

25

-86

-1,027

1,033

466

133

-1,081

308

-55

-174

62

Net income (loss)

104

91

-927

1,093

1,400

384

-898

310

361

1,196

-157

Net income (loss) attributable to common shareholders [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Net income (loss) from continuing operations

79

177

100

60

934

251

183

2

416

1,370

-219

Preferred stock dividends - U.S. Department of Treasury

'

'

'

'

'

'

'

'

-543

[1]

-535

-534

Impact of repurchase of MCP held by U.S. Department of Treasury

'

'

'

'

'

'

'

'

-240

[2]

0

[2]

0

[2]

Preferred stock dividends

'

'

'

'

'

'

'

'

-267

-267

-260

Impact of preferred stock amendment

'

'

'

'

'

'

'

'

0

0

32

Net income (loss) from continuing operations attributable to common shareholders

'

'

'

'

'

'

'

'

-634

[3]

568

[3]

-981

[3]

Income (loss) from discontinued operations, net of tax

25

-86

-1,027

1,033

466

133

-1,081

308

-55

-174

62

Net income (loss) attributable to common shareholders

'

'

'

'

'

'

'

'

($689)

$394

($919)

Basic weighted-average common shares outstanding

'

'

'

'

'

'

'

'

1,355,375

1,330,970

1,330,970

Diluted weighted-average common shares outstanding

'

'

'

'

'

'

'

'

1,355,375

[3]

1,330,970

[3]

1,330,970

[3]

Earnings Per Share, Basic [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Net income (loss) from continuing operations, Per Basic Share

($270)

($18)

($75)

($105)

$551

$38

($13)

($149)

($468)

$427

($738)

Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share

'

'

'

'

'

'

'

'

($41)

($131)

$47

Net (loss) income, Basic

($251)

($82)

($847)

$671

$901

$137

($825)

$82

($509)

$296

($691)

Earnings Per Share, Diluted [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Net income (loss) from continuing operations, Per Diluted Share

($270)

($18)

($75)

($105)

$455

$38

($13)

($149)

($468)

[3]

$427

[3]

($738)

[3]

Income (loss) from discontinued operations, net of tax

'

'

'

'

'

'

'

'

($41)

[3]

($131)

[3]

$47

[3]

Net (loss) income, Diluted

($251)

($82)

($847)

$671

$700

$137

($825)

$82

($509)

[3]

$296

[3]

($691)

[3]

[1]

Includes $8 million of preferred stock dividends paid to the U.S. Department of Treasury related to the period from November 15, 2013 through November 20, 2013.

[2]

Refer to Note 17 to the Consolidated Financial Statements for further detail.

[3]

Due to the antidilutive effect of converting the Fixed Rate Cumulative Mandatorily Convertible Preferred Stock into common shares and the net loss from continuing operations attributable to common shareholders for 2013, and 2011, respectively, net (loss) income from continuing operations attributable to common shareholders and basic weighted-average common shares outstanding were used to calculate basic and diluted earnings per share.

Consolidated_Statement_of_Comp

Consolidated Statement of Comprehensive Income (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statement of Comprehensive Income [Abstract]	'	'	'
Net income (loss)	$361	$1,196	($157)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]	'	'	'
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	-159	331	196
Other Comprehensive Income (Loss), Reclassification Adjustment to Net Income for Sale of Securities, Net of Tax	186	141	284
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	-345	190	-88
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]	'	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	-509	184	-237
Other Comprehensive Income (Loss), Net Investment Hedges Attributable to Parent, Net of Tax	206	-168	173
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	-303	16	-64
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]	'	'	'
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	-1	-4	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	-4	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	3	-4	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]	'	'	'
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	18	-36	-27
Other Comprehensive Income (Loss), Reclassification Adjustment to Net Income, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax	-40	-58	-7
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	58	22	-20
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	-587	224	-172
Comprehensive income (loss)	($226)	$1,420	($329)

Consolidated_Balance_Sheet

Consolidated Balance Sheet (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Assets [Abstract]	'	'
Cash and Due from Banks	$1,315	$1,073
Interest-bearing Deposits in Banks and Other Financial Institutions	4,216	6,440
Total cash and cash equivalents	5,531	7,513
Investment securities	17,083	14,178
Loans held-for-sale, net	35	2,576
Finance receivables and loans, net [Abstract]	'	'
Finance receivables and loans, net	100,328	99,055
Allowance for loan losses	-1,208	-1,170
Total finance receivables and loans, net	99,120	97,885
Investment in operating leases, net	17,680	13,550
Mortgage servicing rights	0	952
Premiums receivable and other insurance assets	1,613	1,609
Other Assets	9,589	11,908
Assets of operations held-for-sale	516	32,176
Total assets	151,167	182,347
Liabilities and Equity [Abstract]	'	'
Noninterest-bearing deposit liabilities	60	1,977
Interest-bearing deposit liabilities	53,290	45,938
Total deposit liabilities	53,350	47,915
Short-term borrowings	8,545	7,461
Long-term debt	69,465	74,561
Interest payable	888	932
Unearned insurance premiums and service revenue	2,314	2,296
Accrued expenses and other liabilities	2,397	6,585
Liabilities of operations held-for-sale	0	22,699
Total liabilities	136,959	162,449
Equity [Abstract]	'	'
Common stock and paid-in capital	20,939	19,668
Mandatorily convertible preferred stock held by U.S. Department of Treasury	0	5,685
Preferred stock	1,255	1,255
Accumulated deficit	-7,710	-7,021
Accumulated other comprehensive income	-276	311
Total equity	14,208	19,898
Total liabilities and equity	151,167	182,347
Variable Interest Entity, Primary Beneficiary [Member]	'	'
Finance receivables and loans, net [Abstract]	'	'
Finance receivables and loans, net	32,265	31,510
Allowance for loan losses	-174	-144
Total finance receivables and loans, net	32,091	31,366
Investment in operating leases, net	4,620	6,060
Other Assets	3,436	2,868
Assets of operations held-for-sale	0	12,139
Total assets	40,147	52,433
Liabilities and Equity [Abstract]	'	'
Short-term borrowings	250	400
Long-term debt	24,147	26,461
Interest payable	0	1
Accrued expenses and other liabilities	43	16
Liabilities of operations held-for-sale	0	9,686
Total liabilities	$24,440	$36,564

Consolidated_Balance_Sheet_Par

Consolidated Balance Sheet (Paranthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Loans Held-for-sale, Fair Value Disclosure	$16	$2,490
Loans Receivable, Fair Value Disclosure	$1	$0

Consolidated_Statement_Of_Chan

Consolidated Statement Of Changes In Equity (USD $)		Total		Common stock and paid-in capital [Member]	Mandatorily convertible preferred stock held by U.S. Department Of Treasury [Member]	Preferred stock [Member]	Retained earnings (accumulated deficit) [Member]		Accumulated Other Comprehensive Income [Member]
In Millions, unless otherwise specified
Beginning Balance at Dec. 31, 2010		$20,398		$19,668	$5,685	$1,287	($6,501)		$259
Increase (Decrease) in Stockholders' Equity [Roll Forward]		'		'	'	'	'		'
Net income (loss)		-157		'	'	'	'		'
Preferred stock dividends - U.S. Department of Treasury		-534		'	'	'	-534		'
Preferred stock dividends		-260		'	'	'	-260		'
Series A preferred stock amendment	[1]	'		'	'	-32	'		'
Dividends, Common Stock		0		'	'	'	32		'
Other comprehensive income (loss)		-172		'	'	'	'		-172
Stockholders' Equity, Other	[1]	5		'	'	'	5		'
Ending Balance at Dec. 31, 2011		19,280		19,668	5,685	1,255	-7,415		87
Increase (Decrease) in Stockholders' Equity [Roll Forward]		'		'	'	'	'		'
Net income (loss)		1,196		'	'	'	'		'
Preferred stock dividends - U.S. Department of Treasury		-535		'	'	'	-535		'
Preferred stock dividends		-267		'	'	'	-267		'
Other comprehensive income (loss)		224		'	'	'	'		224
Ending Balance at Dec. 31, 2012		19,898		19,668	5,685	1,255	-7,021		311
Increase (Decrease) in Stockholders' Equity [Roll Forward]		'		'	'	'	'		'
Net income (loss)		361		'	'	'	'		'
Preferred stock dividends - U.S. Department of Treasury		-543	[2]	'	-8	'	-543	[2]	'
Preferred stock dividends		-267		'	'	'	-267		'
Other comprehensive income (loss)		-587		'	'	'	'		-587
Adjustments to Additional Paid in Capital, Other		1		1	'	'	'		'
Stock Issued During Period, Value, New Issues		1,270		1,270	'	'	'		'
Stock Repurchased During Period, Value	[3]	-5,925		'	-5,685	'	-240		'
Ending Balance at Dec. 31, 2013		$14,208		$20,939	$0	$1,255	($7,710)		($276)
[1]	Represents a reduction of the estimated payment accrued for tax distributions as a result of the completion of the GMACB LLC U.S.B Return of Partnership Income for the tax period JanuaryB 1,B 2009, through JuneB 30,B 2009.
[2]	Includes $8 million of preferred stock dividends paid to the U.S. Department of Treasury related to the period from November 15, 2013 through November 20, 2013.
[3]	Refer to Note 17 to the Consolidated Financial Statements for further detail.

Consolidated_Statement_Of_Cash

Consolidated Statement Of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Net Cash Provided by (Used in) Operating Activities [Abstract]	'		'		'
Net income (loss)	$361		$1,196		($157)
Depreciation, Amortization and Accretion, Net	2,864		2,381		2,713
Changes In Fair Value Of Mortgage Servicing Rights	101		677		1,606
Provision for Loan Losses Expensed Including Discontinued Operations	570		405		217
Gain Loss on Sales of Loans Net Including Discontinued Operations	-55		-527		-459
Available-for-sale Securities Gross Realized Gain Loss Excluding Otti Including Disc Ops	-182		-177		-294
Gain Loss on Extinguishment of Debt Including Discontinued Operations	59		148		64
Payments for Origination and Purchases of Loans Held-for-sale	-6,235		-33,075		-60,270
Proceeds from Sale of Loans Held-for-sale	8,696		34,073		61,187
Total Charge Recorded Related to ResCap Bankruptcy	-600		1,192		0
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	-666		-28		0
Trading assets	0		595		-483
Deferred income taxes	-671		-1,491		-198
Interest payable	-39		-311		-98
Other assets	2,592		802		-311
Other liabilities	-3,860		-595		1,390
Other, net	-434		-216		586
Net cash provided by (used in) operating activities	2,501		5,049		5,493
Net Cash Provided by (Used in) Investing Activities [Abstract]	'		'		'
Purchases of available-for-sale securities	-12,304		-12,816		-19,377
Proceeds from sales of available-for-sale securities	3,627		7,662		14,232
Proceeds from maturities of available-for-sale securities	5,509		5,673		4,965
Net (increase) decrease in finance receivables and loans	-2,479		-11,943		-16,998
Proceeds from Sale of Loans Held-for-investment	0		2,332		2,868
Purchases of operating lease assets	-9,196		-7,444		-6,528
Disposals of operating lease assets	2,964		1,745		5,517
Payments for (Proceeds from) Mortgage Servicing Rights	911		0		0
Proceeds from sale of business units, net	7,444	[1]	516	[1]	50	[1]
Net decrease in cash and cash equivalents from deconsolidation of ResCap	0		-539		0
Increase (Decrease) in Restricted Cash	-70		-1,698		346
Other, net	51		-43		797
Net cash (used in) provided by investing activities	-3,543		-16,555		-14,128
Net Cash Provided by (Used in) Financing Activities [Abstract]	'		'		'
Net change in short-term borrowings	1,591		2,694		514
Net increase in bank deposits	5,375		6,653		6,074
Proceeds from issuance of long-term debt	27,312		39,401		44,754
Repayments of long-term debt	-31,892		-39,909		-40,473
Proceeds from Issuance of Common Stock	1,270		0		0
Payments for Repurchase of Convertible Preferred Stock	-5,925		0		0
Dividends paid	-810		-802		-819
Net cash provided by (used in) financing activities	-3,079		8,037		10,050
Effect of exchange-rate changes on cash and cash equivalents	45		-58		49
Cash and Cash Equivalents, Period Increase (Decrease)	-4,076		-3,527		1,464
Net Cash Provided by (Used in) Discontinued Operations	2,094	[1],[2]	-1,995	[1],[2]	-99	[1],[2]
Cash and cash equivalents at beginning of period	7,513		13,035		11,670
Cash and cash equivalents at end of period	5,531		7,513		13,035
Cash and cash equivalents of business units at the time of disposition	1,586		147		88
Supplemental Cash Flow Information [Abstract]	'		'		'
Interest	3,827		5,311		5,630
Income taxes	75		404		507
Transfer of mortgage servicing rights into trading assets through certification	0		0		266
Proceeds from sales and repayments of mortgage loans held-for-investment originally designated as held-for-sale	$51		$127		$241
[1]	The amounts are net of cash and cash equivalents of $1.6 billion at DecemberB 31, 2013, $147 million at DecemberB 31, 2012, and $88 million at December 31, 2011 of business units at the time of disposition.
[2]	Cash flows of discontinued operations are reflected within operating, investing, and financing activities in the Consolidated Statement of Cash Flows. The cash balance of these operations is reported as assets of operations held-for-sale on the Consolidated Balance Sheet.

Description_Of_Business_Basis_

Description Of Business, Basis Of Presentation, And Changes In Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]	'
	Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies
	Ally Financial Inc. (formerly GMAC Inc. and referred to herein as Ally, we, our, or us) is a leading, independent, diversified, financial services firm. Founded in 1919, we are a leading automotive financial services company with over 90 years of experience providing a broad array of financial products and services to automotive dealers and their customers. We became a bank holding company on December 24, 2008, under the Bank Holding Company Act of 1956, as amended (the BHC Act). Additionally, our election to become a financial holding company (FHC) under the BHC Act was approved by the Board of Governors of the Federal Reserve System (FRB), and became effective on December 20, 2013. Our banking subsidiary, Ally Bank, is an indirect wholly owned subsidiary of Ally Financial Inc. and a leading franchise in the growing direct (internet, telephone, mobile, and mail) banking market.
	Residential Capital, LLC
	Our mortgage operations were historically a significant portion of our operations and were conducted primarily through the Residential Capital, LLC (ResCap) subsidiary. On May 14, 2012, ResCap and certain of its wholly owned direct and indirect subsidiaries (collectively, the Debtors) filed voluntary petitions for relief under Chapter 11 of the Bankruptcy Code in the United States Bankruptcy Court for the Southern District of New York (the Bankruptcy Court). As a result of the bankruptcy filing, effective May 14, 2012, we deconsolidated ResCap from our financial statements and recorded a charge of $442 million for the impairment of Ally's investment in ResCap. During the first quarter of 2013, we discontinued performing certain mortgage activities, which were required as part of the bankruptcy process until the sale of certain assets occurred. As a result of us discontinuing these activities, the operations of ResCap were classified as discontinued.
	On May 14, 2013, Ally Financial Inc., on behalf of itself and certain of its subsidiaries (collectively, AFI) entered into a Plan Support Agreement (the PSA) with the Debtors, the official committee of unsecured creditors appointed in the Debtors’ Chapter 11 cases, and certain creditors. The PSA, which was approved by the Bankruptcy Court on June 26, 2013, required the parties to support a Chapter 11 plan in the Debtors’ Chapter 11 cases (the Plan) that, among other things, settled and provided AFI full releases for all existing and potential claims between AFI and the Debtors, including all representation and warranty claims that resided with the Debtors, as well as full releases for all pending and potential claims related to the Debtors that have been or could be brought against AFI by third parties.
	On July 3, 2013, the Debtors filed the Plan and related disclosure statement (the Disclosure Statement), with the Bankruptcy Court. The Bankruptcy Court entered an order approving the Disclosure Statement on August 23, 2013. Pursuant to the Plan, on the effective date of the Plan AFI contributed to the Debtors' estates $1.95 billion in cash, and will further contribute $150 million received by AFI for claims it pursues against its insurance carriers related to the claims released in connection with the Plan, with such amount guaranteed by AFI to be paid no later than September 30, 2014. The Bankruptcy Court entered an order confirming the Plan on December 11, 2013, which became effective on December 17, 2013. The confirmed Plan excludes from the third party releases the Federal National Mortgage Association (Fannie Mae) and the Federal Home Loan Mortgage Corporation (Freddie Mac), and the Federal Housing Finance Agency (the FHFA) as conservator for Fannie Mae and Freddie Mac, with respect to certain ordinary-course claims against Ally Bank as a former mortgage seller and servicer, as well as the Department of Justice and state attorneys general with respect to certain types of claims. Further, AFI has agreed to settlements with each of the FHFA and the Federal Deposit Insurance Corporation (FDIC), as receiver for certain failed banks, pursuant to which, among other things, in exchange for a monetary payment, the FHFA’s and FDIC’s previously pending lawsuits against AFI were dismissed.
	Consolidation and Basis of Presentation
	The Consolidated Financial Statements include our accounts and accounts of our majority-owned subsidiaries, after eliminating intercompany balances and transactions, and include all variable interest entities (VIEs) in which we are the primary beneficiary. Refer to Note 9 for further details on our VIEs. Our accounting and reporting policies conform to accounting principles generally accepted in the United States of America (GAAP). Additionally, where applicable, the policies conform to the accounting and reporting guidelines prescribed by bank regulatory authorities.
	We operate our international subsidiaries in a similar manner as we operate in the United States of America (U.S. or United States), subject to local laws or other circumstances that may cause us to modify our procedures accordingly. The financial statements of subsidiaries that operate outside of the United States generally are measured using the local currency as the functional currency. All assets and liabilities of foreign subsidiaries are translated into U.S. dollars at year-end exchange rates. The resulting translation adjustments are recorded in accumulated other comprehensive income. Income and expense items are translated at average exchange rates prevailing during the reporting period.
	Use of Estimates and Assumptions
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and that affect income and expenses during the reporting period and related disclosures. In developing the estimates and assumptions, management uses all available evidence; however, actual results could differ because of uncertainties associated with estimating the amounts, timing, and likelihood of possible outcomes.
	Significant Accounting Policies
	Cash and Cash Equivalents
	Cash and cash equivalents include cash on hand and certain highly liquid investment securities with maturities of three months or less from the date of purchase. Cash and cash equivalents that have restrictions on our ability to withdraw the funds are included in other assets on our Consolidated Balance Sheet. The book value of cash equivalents approximates fair value because of the short maturities of these instruments. Certain securities with original maturities less than 90 days that are held as a portion of longer-term investment portfolios, primarily held by our Insurance operations, are classified as investment securities.
	Securities
	Our portfolio of securities includes government securities, corporate bonds, asset- and mortgage-backed securities (MBS), interests in securitization trusts, equity securities, and other investments. Securities are classified based on management's intent. Our securities are primarily classified as available-for-sale and carried at fair value with unrealized gains and losses included in accumulated other comprehensive income or loss, on an after-tax basis. Premiums and discounts on debt securities are amortized as an adjustment to investment yield generally over the stated maturity of the security. We employ a systematic methodology that considers available evidence in evaluating potential other-than-temporary impairment of our investments classified as available-for-sale. If the cost of an investment exceeds its fair value, we evaluate, among other factors, the magnitude and duration of the decline in fair value. We also evaluate the financial health of and business outlook for the issuer, the performance of the underlying assets for interests in securitized assets, and our intent and ability to hold the investment.
	Once a decline in fair value of a debt security is determined to be other-than-temporary, an impairment charge for the credit component is recorded to other gain (loss) on investments, net, in our Consolidated Statement of Income, and a new cost basis in the investment is established. Noncredit component losses of a debt security are recorded in other comprehensive income (loss) when we do not intend to sell the security or it is not more likely than not that we will have to sell the security prior to the security's anticipated recovery. Subsequent increases and decreases to the fair value of available-for-sale securities are included in other comprehensive income (loss), so long as they are not attributable to another other-than-temporary impairment.
	Realized gains and losses on investment securities are reported in other gain (loss) on investments, net, and are determined using the specific identification method.
	For information on investment securities refer to Note 6.
	Finance Receivables and Loans
	Finance receivables and loans are reported at the principal amount outstanding, net of unearned income, premiums and discounts, and allowances. Unearned income, which includes unearned rate support received from an automotive manufacturer on certain automotive loans and deferred origination fees reduced by origination costs, is amortized over the contractual life of the related finance receivable or loan using the effective interest method. We make incentive payments for consumer automobile loan originations to automotive dealers under our Ally Dealer Rewards Program and account for these payments as direct loan origination costs. Loan commitment fees are generally deferred and amortized over the commitment period. For information on finance receivables and loans, refer to Note 7.
	We classify finance receivables and loans between loans held-for-sale and loans held-for-investment based on management's assessment of our intent and ability to hold loans for the foreseeable future or until maturity. Management's intent and ability with respect to certain loans may change from time to time depending on a number of factors including economic, liquidity, and capital conditions. Management's view of the foreseeable future is based on the longest reasonably reliable net income, liquidity, and capital forecast period.
	Our portfolio segments are based on the level at which we develop and document our methodology for determining the allowance for loan losses. Additionally, the classes of finance receivables are based on several factors including the method for monitoring and assessing credit risk, the method of measuring carrying value, and the risk characteristics of the finance receivable. Based on an evaluation of our process for developing the allowance for loan losses including the nature and extent of exposure to credit risk arising from finance receivables, we have determined our portfolio segments to be consumer automobile, consumer mortgage, and commercial.
	•	Consumer automobile — Consists of retail automobile financing for new and used vehicles.
	•	Consumer mortgage — Consists of first mortgage, subordinate-lien mortgages and home equity loans.
	•	Commercial — Consists of the following classes of finance receivables.
	•	Commercial and Industrial
	•	Automobile — Consists of financing operations to fund dealer purchases of new and used vehicles through wholesale or floorplan financing. Additional commercial offerings include automotive dealer term loans, revolving lines of credit, and dealer fleet financing.
	•	Mortgage — Consists primarily of warehouse lending.
	•	Other — Consists of senior secured commercial lending.
	•	Commercial Real Estate — Automobile — Consists of term loans to finance dealership land and buildings.
	Nonaccrual Loans
	Revenue recognition is suspended when any finance receivables and loans are placed on nonaccrual status. Generally, all classes of finance receivables and loans are placed on nonaccrual status when principal or interest has been delinquent for 90 days or when full collection is determined not to be probable. Exceptions include commercial real estate loans that are placed on nonaccrual status when delinquent for 60 days. These loans are reported as nonperforming loans in Note 7. Revenue accrued, but not collected, at the date finance receivables and loans are placed on nonaccrual status is reversed and subsequently recognized only to the extent it is received in cash or until it qualifies for return to accrual status. However, where there is doubt regarding the ultimate collectability of loan principal, all cash received is applied to reduce the carrying value of such loans. Finance receivables and loans are restored to accrual status only when contractually current and the collection of future payments is reasonably assured.
	Generally, we recognize all classes of loans as past due when they are 30 days delinquent on making a contractually required payment.
	Impaired Loans
	All classes of loans are considered impaired when we determine it is probable that we will be unable to collect all amounts due (both principal and interest) according to the terms of the loan agreement.
	For all classes of consumer loans, impaired loans are loans that have been modified in troubled debt restructurings (TDRs).
	All classes of commercial loans are considered impaired on an individual basis and reported as impaired when we determine it is probable that we will be unable to collect all amounts due according to the terms of the loan agreement.
	With exception of certain consumer TDRs that have been returned to accruing status, for all classes of impaired loans, income recognition is consistent with that of nonaccrual loans discussed above. For collateral dependent loans, if the recorded investment in impaired loans exceeds the fair value of the collateral, a charge-off is recorded consistent with the TDR discussion below.
	Troubled Debt Restructurings (TDRs)
	When the terms of finance receivables or loans are modified, consideration must be given as to whether or not the modification results in a TDR. A modification is considered to be a TDR when both a) the borrower is experiencing financial difficulty and b) we grant a concession to the borrower. These considerations require significant judgment and vary by portfolio segment. In all cases, the cumulative impacts of all modifications are considered at the time of the most recent modification.
	For all classes of consumer loans, various qualitative factors are utilized for assessing the financial difficulty of the borrower. These include, but are not limited to, the borrowers default status on any of its debts, bankruptcy and recent changes in financial circumstances (loss of job, etc.). A concession has been granted when as a result of the modification we do not expect to collect all amounts due, including interest accrued at the original contract rate. Types of modifications that may be considered concessions include, but are not limited to, extensions of terms at a rate that does not constitute a market rate, a reduction, deferral or forgiveness of principal or interest owed and loans that have been discharged in a Chapter 7 Bankruptcy and have not been reaffirmed by the borrower.
	In addition to the modifications noted above, in our consumer automobile class of loans we also provide extensions or deferrals of payments to borrowers who we deem to be experiencing only temporary financial difficulty. In these cases, there are limits within our operational policies to minimize the number of times a loan can be extended, as well as limits to the length of each extension, including a cumulative cap over the life of the loan. Before offering an extension or deferral, we evaluate the capacity of the customer to make the scheduled payments after the deferral period. During the deferral period, we continue to accrue and collect interest on the loan as part of the deferral agreement. We grant these extensions or deferrals when we expect to collect all amounts due including interest accrued at the original contract rate.
	A restructuring that results in only a delay in payment that is deemed to be insignificant is not a concession and the modification is not considered to be a TDR. In order to assess whether a restructuring that results in a delay in payment is insignificant, we consider the amount of the restructured payments subject to delay in conjunction with the unpaid principal balance or the collateral value of the loan, whether or not the delay is significant with respect to the frequency of payments under the original contract, or the loan's original expected duration. In the cases where payment extensions on our automobile loan portfolio cumulatively extend beyond 90 days and are more than 10% of the original contractual term or any cumulative extension beyond 180 days, we deem the delay in payment to be more than insignificant, and as such, classify these types of modifications as TDRs. Otherwise, we believe that the modifications do not represent a concessionary modification and accordingly, they are not classified as TDRs.
	For all classes of commercial loans, similar qualitative factors are considered when assessing the financial difficulty of the borrower. In addition to the factors noted above, consideration is also given to the borrower's forecasted ability to service the debt in accordance with the contractual terms, possible regulatory actions and other potential business disruptions (e.g., the loss of a significant customer or other revenue stream). Consideration of a concession is also similar for commercial loans. In addition to the factors noted above, consideration is also given to whether additional guarantees or collateral have been provided.
	For all loans, TDR classification typically results from our loss mitigation activities. For loans held-for-investment that are not carried at fair value and are TDRs, impairment is typically measured based on the differences between the net carrying value of the loan and the present value of the expected future cash flows of the loan. The loan may also be measured for impairment based on the fair value of the underlying collateral less costs to sell for loans that are collateral dependent. We recognize impairment by either establishing a valuation allowance or recording a charge-off.
	The financial impacts of modifications that meet the definition of a TDR are reported in the period in which they are identified as TDRs. Additionally, if a loan that is classified as a TDR redefaults within twelve months of the modification, we are required to disclose the instances of redefault. For the purpose of this disclosure, we have determined that a loan is considered to have redefaulted when the loan meets the requirements for evaluation under our charge-off policy except for commercial loans where redefault is defined as 90 days past due.
	Our policy is to generally place all TDRs on nonaccrual status until the loan has been brought fully current, the collection of contractual principal and interest is reasonably assured, and six consecutive months of repayment performance is achieved. In certain cases, if a borrower has been current up to the time of the modification and repayment of the debt subsequent to the modification is reasonably assured, we may choose to continue to accrue interest on the loan.
	Charge-offs
	As a general rule, consumer automobile loans are written down to estimated collateral value, less costs to sell, once a loan becomes 120 days past due. In our consumer mortgage segment, first-lien mortgages and a subset of our home equity portfolio that are secured by real estate in a first-lien position are written down to the estimated fair value of the collateral, less costs to sell, once a mortgage loan becomes 180 days past due. Consumer mortgage loans that represent second-lien positions are charged off at 180 days past due. Consumer mortgage loans within our second-lien portfolio in bankruptcy that are 60 days past due are fully charged off within 60 days of receipt of notification of filing from the bankruptcy court. Consumer automobile and first-lien consumer mortgage loans in bankruptcy that are 60 days past due are written down to the estimated fair value of the collateral, less costs to sell, within 60 days of receipt of notification of discharge from the bankruptcy court. Regardless of other timelines noted within this policy, loans are considered collateral dependent once foreclosure or repossession proceedings begin and are charged off to the estimated fair value of the underlying collateral, less costs to sell at that time.
	Commercial loans are individually evaluated and where collectability of the recorded balance is in doubt are written down to the estimated fair value of the collateral less costs to sell. Generally, all commercial loans are charged off when it becomes unlikely that the borrower is willing or able to repay the remaining balance of the loan and any underlying collateral is not sufficient to recover the outstanding principal. Collateral dependent loans are charged-off to the fair market value of collateral less costs to sell and non-collateral dependent loans are fully written-off.
	Allowance for Loan Losses
	The allowance for loan losses (the allowance) is management's estimate of incurred losses in the lending portfolios. We determine the amount of the allowance required for each of our portfolio segments based on its relative risk characteristics. The evaluation of these factors for both consumer and commercial finance receivables and loans involves quantitative analysis combined with sound management judgment. Additions to the allowance are charged to current period earnings through the provision for loan losses; amounts determined to be uncollectible are charged directly against the allowance, net of amounts recovered on previously charged-off accounts.
	The allowance is comprised of two components: specific reserves established for individual loans evaluated as impaired and portfolio-level reserves established for large groups of typically smaller balance homogeneous loans that are collectively evaluated for impairment. We evaluate the adequacy of the allowance based on the combined total of these two components. Determining the appropriateness of the allowance is complex and requires judgment by management about the effect of matters that are inherently uncertain. It is possible that others, given the same information, may at any point in time reach different reasonable conclusions.
	Measurement of impairment for specific reserves is generally determined on a loan-by-loan basis. Loans determined to be specifically impaired are measured based on the present value of expected future cash flows discounted at the loan's effective interest rate, an observable market price, or the estimated fair value of the collateral less estimated costs to sell, whichever is determined to be the most appropriate. When these measurement values are lower than the carrying value of that loan, impairment is recognized. Loans that are not identified as individually impaired are pooled with other loans with similar risk characteristics for evaluation of impairment for the portfolio-level allowance.
	For the purpose of calculating portfolio-level reserves, we have grouped our loans into three portfolio segments: consumer automobile, consumer mortgage, and commercial. The allowance consists of the combination of a quantitative assessment component based on statistical models, a retrospective evaluation of actual loss information to loss forecasts, and includes a qualitative component based on management judgment. Management takes into consideration relevant qualitative factors, including external and internal trends such as the impacts of changes in underwriting standards, collections and account management effectiveness, geographic concentrations, and economic events, among other factors, that have occurred but are not yet reflected in the quantitative assessment component. Qualitative adjustments are documented, reviewed, and approved through our established risk governance processes. Refer to Note 7 for information on the allowance for loan losses.
	Consumer Loans
	Our consumer automobile and consumer mortgage portfolio segments are reviewed for impairment based on an analysis of loans that are grouped into common risk categories (i.e., past due status, loan or lease type, collateral type, borrower, industry or geographic concentrations). We perform periodic and systematic detailed reviews of our lending portfolios to identify inherent risks and to assess the overall collectability of those portfolios. Loss models are utilized for these portfolios, which consider a variety of credit quality indicators including, but not limited to, historical loss experience, current economic conditions, anticipated repossessions or foreclosures based on portfolio trends, delinquencies and credit scores, and expected loss factors by loan type.
	Consumer Automobile Portfolio Segment
	The allowance for loan losses within the consumer automobile portfolio segment is calculated using proprietary statistical models and other risk indicators applied to pools of loans with similar risk characteristics, including credit bureau score and loan-to-value ratios to arrive at an estimate of incurred losses in the portfolio. These statistical loss forecasting models are utilized to estimate incurred losses and consider a variety of factors including, but not limited to, historical loss experience, estimated defaults based on portfolio trends, delinquencies, and general economic and business trends. These statistical models predict forecasted losses inherent in the portfolio based on both vintage and migration analyses.
	The forecasted losses consider historical factors such as frequency (the number of contracts that we expect to default) and loss severity (the expected loss on a per vehicle basis). The loss severity within the consumer automobile portfolio segment is impacted by the market values of vehicles that are repossessed. Vehicle market values are affected by numerous factors including vehicles supply, the condition of the vehicle upon repossession, the overall price and volatility of gasoline or diesel fuel, consumer preference related to specific vehicle segments, and other factors. The historical loss experience is updated quarterly to incorporate the most recent data reflective of the current economic environment.
	The quantitative assessment component is supplemented with qualitative reserves based on management's determination that such adjustments provide a better estimate of credit losses. This qualitative assessment takes into consideration relevant internal and external factors that have occurred but are not yet reflected in the forecasted losses and may affect the performance of the portfolio.
	Our methodology and policies with respect to the allowance for loan losses for our consumer automobile portfolio segment did not change during 2013.
Consumer Mortgage Portfolio Segment
The allowance for loan losses within the consumer mortgage portfolio segment is calculated by using proprietary statistical models based on pools of loans with similar risk characteristics, including credit score, loan-to-value, loan age, documentation type, product type, and loan purpose, to arrive at an estimate of incurred losses in the portfolio. These statistical loss forecasting models are utilized to estimate incurred losses and consider a variety of factors including, but not limited to, historical loss experience, estimated foreclosures or defaults based on portfolio trends, delinquencies, and general economic and business trends.
The forecasted losses are statistically derived based on a suite of behavioral based transition models. This transition framework predicts various stages of delinquency, default, and voluntary prepayment over the course of the life of the loan. The transition probability is a function of the loan and borrower characteristics and economic variables and considers historical factors such as frequency (the number of contracts that we expect to default) and loss severity (the expected loss on a per loan basis). When a default event is predicted, a severity model is applied to estimate future loan losses. Loss severity within the consumer mortgage portfolio segment is impacted by the market values of foreclosed properties, which is affected by numerous factors, including geographic considerations and the condition of the foreclosed property. The historical loss experience is updated quarterly to incorporate the most recent data reflective of the current economic environment.
The quantitative assessment component is supplemented with qualitative reserves based on management's determination that such adjustments provide a better estimate of credit losses. This qualitative assessment takes into consideration relevant internal and external factors that have occurred but are not yet reflected in the forecasted losses and may affect the credit quality of the portfolio.
Our methodology and policies with respect to the allowance for loan losses for our consumer mortgage portfolio segment did not change during 2013.
Commercial Loans
The allowance for loan losses within the commercial portfolio is comprised of reserves established for specific loans evaluated as impaired and portfolio-level reserves based on nonimpaired loans grouped into pools based on similar risk characteristics and collectively evaluated.
A commercial loan is considered impaired when it is probable that we will be unable to collect all amounts due according to the contractual terms of the loan agreement based on current information and events. These loans are primarily evaluated individually and are risk-rated based on borrower, collateral, and industry-specific information that management believes is relevant in determining the occurrence of a loss event and measuring impairment. Management establishes specific allowances for commercial loans determined to be individually impaired based on the present value of expected future cash flows, discounted at the loan's effective interest rate, observable market price or the fair value of collateral, whichever is determined to be the most appropriate. Estimated costs to sell or realize the value of the collateral on a discounted basis are included in the impairment measurement, when appropriate.
Loans not identified as impaired are grouped into pools based on similar risk characteristics and collectively evaluated. Our risk rating models use historical loss experience, concentrations, current economic conditions, and performance trends. The commercial historical loss experience is updated quarterly to incorporate the most recent data reflective of the current economic environment. The determination of the allowance is influenced by numerous assumptions and many factors that may materially affect estimates of loss, including volatility of loss given default, probability of default, and rating migration. In assessing the risk rating of a particular loan, several factors are considered including an evaluation of historical and current information involving subjective assessments and interpretations. In addition, the allowance related to the commercial portfolio segment is influenced by estimated recoveries from automotive manufacturers relative to guarantees or agreements with them to repurchase vehicles used as collateral to secure the loans.
The quantitative assessment component may be supplemented with qualitative reserves based on management's determination that such adjustments provide a better estimate of credit losses. This qualitative assessment takes into consideration relevant internal and external factors that have occurred and may affect the credit quality of the portfolio.
Our methodology and policies with respect to the allowance for loan losses for our commercial portfolio segment did not change during 2013.
Securitizations and Variable Interest Entities
We securitize, transfer, and service consumer automobile loans, operating leases, and wholesale loans. Securitization transactions typically involve the use of variable interest entities and are accounted for either as sales or secured financings. We may retain economic interests in the securitized and sold assets, which are generally retained in the form of senior or subordinated interests, interest- or principal-only strips, cash reserve accounts, residual interests, and servicing rights.
In order to conclude whether or not a variable interest entity is required to be consolidated, careful consideration and judgment must be given to our continuing involvement with the variable interest entity. In circumstances where we have both the power to direct the activities of the entity that most significantly impact the entity's performance and the obligation to absorb losses or the right to receive benefits of the entity that could be significant, we would conclude that we would consolidate the entity, which would also preclude us from recording an accounting sale on the transaction. In the case of a consolidated variable interest entity, the accounting is consistent with a secured financing, (i.e., we continue to carry the loans and we record the related securitized debt on our balance sheet).
In transactions where either one or both of the power or economic criteria mentioned above are not met, we then must determine whether or not we achieve a sale for accounting purposes. In order to achieve a sale for accounting purposes, the assets being transferred must be legally isolated, not be constrained by restrictions from further transfer, and be deemed to be beyond our control. If we were to fail any of the three criteria for sale accounting, the accounting would be consistent with the preceding paragraph (i.e., a secured borrowing). Refer to Note 9 for discussion on variable interest entities.
Gains or losses on off-balance sheet securitizations take into consideration the fair value of the retained interests including the value of certain servicing assets or liabilities, if any, which are initially recorded at fair value at the date of sale. The estimate of the fair value of the retained interests and servicing requires us to exercise significant judgment about the timing and amount of future cash flows from the interests. Refer to Note 24 for a discussion of fair value estimates.
Gains or losses on off-balance sheet securitizations and sales are reported in gain (loss) on mortgage and automotive loans, net, in our Consolidated Statement of Income for consumer automobile loans, and wholesale loans. Declines in the fair value of retained interests below the carrying amount are reflected in other comprehensive income, or as other gain on investments, net, in our Consolidated Statement of Income if such declines are determined to be other-than-temporary or if the interests are classified as trading. Retained interests, as well as any purchased securities, are generally included in available-for-sale investment securities, trading investment securities, or other assets. Designation as available-for-sale or trading depends on management's intent. Securities that are noncertificated and cash reserve accounts related to securitizations are included in other assets on our Consolidated Balance Sheet.
We retain servicing responsibilities for all of our consumer automobile loan, operating lease, and wholesale loan securitizations. We may receive servicing fees based on the securitized loan balances and certain ancillary fees, all of which are reported in servicing fees in the Consolidated Statement of Income.
Whether on- or off-balance sheet, the investors in the securitization trusts generally have no recourse to our assets outside of customary market representation and warranty repurchase provisions.
Mortgage Servicing Rights
We capitalized the value expected to be realized from performing specified mortgage servicing activities for others as mortgage servicing rights (MSRs) when the expected future cash flows from servicing were projected to be more than adequate compensation for such activities. These capitalized servicing rights were purchased or retained upon sale or securitization of mortgage loans. MSRs were not recorded on securitizations accounted for as secured financings.
We measured all mortgage servicing assets and liabilities at fair value. We defined our servicing rights based on both the availability of market inputs and the manner in which we managed the risks of our servicing assets and liabilities. We leveraged all available relevant market data to determine the fair value of our recognized servicing assets and liabilities. We sold our remaining MSRs during the year ended December 31, 2013. Refer to Note 10 for further details.
Repossessed and Foreclosed Assets
Assets are classified as repossessed and foreclosed and included in other assets when physical possession of the collateral is taken regardless of whether foreclosure proceedings have taken place. Repossessed and foreclosed assets are carried at the lower of the outstanding balance at the time of repossession or foreclosure or the fair value of the asset less estimated costs to sell. Losses on the revaluation of repossessed and foreclosed assets are charged to the allowance for loan losses at the time of repossession. Declines in value after repossession are charged to other operating expenses for loans and depreciation expense for operating lease assets as incurred.
Investment in Operating Leases
Investment in operating leases represents the automobiles that are underlying the automotive lease contracts and is reported at cost, less accumulated depreciation and net of impairment charges and origination fees or costs. Depreciation of vehicles is generally provided on a straight-line basis to an estimated residual value over the lease term. Manufacturer support payments that we receive are treated as a reduction to the cost-basis in the underlying lease asset, which has the effect of reducing depreciation expense over the life of the contract. We periodically evaluate our depreciation rate for leased vehicles based on projected residual values. Income from operating lease assets that includes lease origination fees, net of lease origination costs, is recognized as operating lease revenue on a straight-line basis over the scheduled lease term.
We have significant investments in the residual values of the assets in our operating lease portfolio. The residual values represent an estimate of the values of the assets at the end of the lease contracts. At contract inception, we determine the projected residual value based on an internal evaluation of the expected future value. This evaluation is based on a proprietary model, which includes variables such as age, mileage, seasonality, segment factors, vehicle type, economic indicators and production cycle. This internally generated data is compared against third party, independent data for reasonableness and analysis. Realization of the residual values is dependent on our future ability to market the vehicles under the prevailing market conditions. Over the life of the lease, we evaluate the adequacy of our estimate of the residual value and may make adjustments to the depreciation rates to the extent the expected value of the vehicle (including any residual support payments) at lease termination changes. In addition to estimating the residual value at lease termination, we also evaluate the current value of the operating lease asset and test for impairment to the extent necessary based on market considerations and portfolio characteristics. Impairment is determined to exist if the undiscounted expected future cash flows are lower than the carrying value of the asset. If our operating lease assets are considered to be impaired, the impairment is measured as the amount by which the carrying amount of the assets exceeds the fair value as estimated by discounted cash flows. The accrual of revenue on operating leases is generally discontinued at the time an account is determined to be uncollectible, at the earliest of time of repossession, within 60 days of bankruptcy notification and greater than 60 days past due, or greater than 120 days past due.
When a lease vehicle is returned to us, the asset is reclassified from investment in operating leases, net, to other assets and recorded at the lower-of-cost or estimated fair value, less costs to sell, on our Consolidated Balance Sheet.
Impairment of Long-lived Assets
The carrying value of long-lived assets (including property and equipment) are evaluated for impairment whenever events or changes in circumstances indicate that their carrying values may not be recoverable from the estimated undiscounted future cash flows expected to result from their use and eventual disposition. Recoverability of assets to be held and used is measured by a comparison of their carrying amount to future net undiscounted cash flows expected to be generated by the assets. If these assets are considered to be impaired, the impairment is measured as the amount by which the carrying amount of the assets exceeds the fair value as estimated by discounted cash flows. No material impairment was recognized in 2013, 2012, or 2011.
An impairment test on an asset group to be sold or otherwise disposed of is performed upon occurrence of a triggering event or when certain criteria are met (e.g., the asset is planned to be disposed of within twelve months, appropriate levels of authority have approved the sale, there is an active program to locate a buyer, etc.), which cause the disposal group to be classified as held-for-sale. Long-lived assets held-for-sale are recorded at the lower of their carrying amount or estimated fair value less cost to sell. If the carrying value of the assets held-for-sale exceeds the fair value less cost to sell, we recognize an impairment loss based on the excess of the carrying amount over the fair value of the assets less cost to sell. During 2013, 2012, and 2011, impairment losses were recognized on asset groups that were classified as held-for-sale or disposed of by sale. Refer to Note 2 for a discussion of discontinued and held-for-sale operations.
Property and Equipment
Property and equipment stated at cost, net of accumulated depreciation and amortization, are reported in other assets on our Consolidated Balance Sheet. Included in property and equipment are certain buildings, furniture and fixtures, leasehold improvements, company vehicles, IT hardware and software, and capitalized software costs. Depreciation is computed on a straight-line basis over the estimated useful lives of the assets, which generally ranges from three to thirty years. Capitalized software is generally amortized on a straight-line basis over its useful life, which generally ranges from three to five years. Capitalized software that is not expected to provide substantive service potential or for which development costs significantly exceed the amount originally expected is considered impaired and written down to fair value. Software expenditures that are considered general, administrative, or of a maintenance nature are expensed as incurred.
Unearned Insurance Premiums and Service Revenue
Insurance premiums, net of premiums ceded to reinsurers, and service revenue are earned over the terms of the policies. The portion of premiums and service revenue written applicable to the unexpired terms of the policies is recorded as unearned insurance premiums or unearned service revenue. For extended service and maintenance contracts, premiums and service revenues are earned on a basis proportionate to the anticipated cost emergence. For other short duration contracts, premiums and unearned service revenue are earned on a pro rata basis. For further information, refer to Note 3.
Deferred Policy Acquisition Costs
Commissions, including compensation paid to sellers of vehicle service contracts and other costs of acquiring insurance that are primarily related to and vary with the production of business, are deferred and recorded in other assets. Deferred policy acquisition costs are amortized over the terms of the related policies and service contracts on the same basis as premiums and revenue are earned except for direct response advertising costs, which are amortized over their expected future benefit. We group costs incurred for acquiring like contracts and consider anticipated investment income in determining the recoverability of these costs.
Reserves for Insurance Losses and Loss Adjustment Expenses
Reserves for insurance losses and loss adjustment expenses are reported in accrued expenses and other liabilities. They are established for the unpaid cost of insured events that have occurred as of a point in time. More specifically, the reserves for insurance losses and loss adjustment expenses represent the accumulation of estimates for both reported losses and those incurred, but not reported, including claims adjustment expenses relating to direct insurance and assumed reinsurance agreements. Estimates for salvage and subrogation recoverable are recognized at the time losses are incurred and netted against provision for insurance losses and loss adjustment expenses. Reserves are established for each business at the lowest meaningful level of homogeneous data. Since the reserves are based on estimates, the ultimate liability may vary from such estimates. The estimates are regularly reviewed and adjustments, which can potentially be significant, are included in earnings in the period in which they are deemed necessary.
Legal and Regulatory Reserves
Reserves for legal and regulatory matters are established when those matters present loss contingencies that are both probable and estimable, with a corresponding amount recorded to other noninterest expense. In cases where we have an accrual for losses, it is our policy to include an estimate for probable and estimable legal expenses related to the case. If, at the time of evaluation, the loss contingency related to a legal or regulatory matter is not both probable and estimable, we do not establish an accrued liability. We continue to monitor legal and regulatory matters for further developments that could affect the requirement to establish a liability or that may impact the amount of a previously established liability. There may be exposure to loss in excess of any amounts recognized. For certain other matters where the risk of loss is determined to be reasonably possible, estimable, and material to the financial statements, disclosure regarding details of the matter and an estimated range of loss is required. The estimated range of possible loss does not represent our maximum loss exposure. Financial statement disclosure is also required for matters that are deemed probable or reasonably possible, material to the financial statements, but for which an estimated range of loss is not possible to determine. While we believe our reserves are adequate, the outcome of legal and regulatory proceedings is extremely difficult to predict and we may settle claims or be subject to judgments for amounts that differ from our estimates. For information regarding the nature of all material contingencies, refer to Note 29.
Loan Repurchase and Obligations Related to Loan Sales
Our mortgage operations has sold consumer loans through securitization transactions involving the Federal National Mortgage Association (Fannie Mae), the Federal Home Loan Mortgage Corporation (Freddie Mac), and the Government National Mortgage Association (Ginnie Mae) (collectively, the Government-sponsored Enterprises, or GSEs) and via whole-loan transactions directly to third party investors. In connection with these activities we provide to the GSEs and third party investors various representations and warranties related to the loans sold. These representations and warranties generally relate to, among other things, the ownership of the loan, the validity of the lien securing the loan, the loan's compliance with the criteria for inclusion in the transaction, including compliance with underwriting standards or loan criteria established by the buyer, ability to deliver required documentation and compliance with applicable laws. Generally, the representations and warranties described in Note 29 may be enforced at any time over the life of the loan.
Upon a breach of a representation, we correct the breach in a manner conforming to the provisions of the sale agreement. This may require us either to repurchase the loan or to indemnify (make-whole) a party for incurred losses or provide other recourse to a GSE or investor. Repurchase demands and claims for indemnification payments are reviewed on a loan-by-loan basis to validate if there has been a breach requiring repurchase or a make-whole payment. We actively contest claims to the extent we do not consider them valid. In cases where we repurchase loans, we bear the credit loss on the loans. Repurchased loans are classified as held-for-sale and initially recorded at fair value and subsequently at the lower of cost or market. We seek to manage the risk of repurchase and associated credit exposure through our underwriting and quality assurance practices and by servicing mortgage loans to meet investor standards.
The reserve for representation and warranty obligations reflects management's best estimate of probable lifetime loss. We consider historical and recent demand trends in establishing the reserve. The methodology used to estimate the reserve considers a variety of assumptions including borrower performance (both actual and estimated future defaults), repurchase demand behavior, historical loan defect experience, historical and estimated future loss experience, which includes projections of future home price changes as well as other qualitative factors including investor behavior. In cases where we may not be able to reasonably estimate losses, a liability is not recognized. Management monitors the adequacy of the overall reserve and makes adjustments to the level of reserve, as necessary, after consideration of other qualitative factors including ongoing dialogue with counterparties.
At the time a loan is sold, an estimate of the fair value of the liability is recorded and classified in other liabilities on our Consolidated Balance Sheet, and recorded as a component of gain (loss) on mortgage and automotive loans, net, in our Consolidated Statement of Income. We recognize changes in the reserve when additional relevant information becomes available. Changes in the liability are recorded as other operating expenses in our Consolidated Statement of Income.
Earnings per Common Share
We compute basic earnings (loss) per common share by dividing net income (loss) from continuing operations attributable to common shareholders after deducting dividends on preferred stock by the weighted-average number of common shares outstanding during the period. We compute diluted earnings (loss) per common share by dividing net income (loss) from continuing operations after deducting dividends on preferred stock by the weighted-average number of common shares outstanding during the period plus the dilution resulting from the conversion of convertible preferred stock, if applicable.
Derivative Instruments and Hedging Activities
We primarily use derivative instruments for risk management purposes. Some of our derivative instruments are designated in qualifying hedge accounting relationships; other derivative instruments do not qualify for hedge accounting or are not elected to be designated in a qualifying hedging relationship. In accordance with applicable accounting standards, all derivative financial instruments, whether designated for hedge accounting or not, are required to be recorded on the balance sheet as assets or liabilities and measured at fair value. Additionally, we report derivative financial instruments on the Consolidated Balance Sheet primarily on a gross basis. For additional information on derivative instruments and hedging activities, refer to Note 21.
At inception of a hedge accounting relationship, we designate each qualifying derivative financial instrument as a hedge of the fair value of a specifically identified asset or liability (fair value hedge); as a hedge of the variability of cash flows to be received or paid related to a recognized asset or liability (cash flow hedge); or as a hedge of the foreign-currency exposure of a net investment in a foreign operation. We formally document all relationships between hedging instruments and hedged items and risk management objectives for undertaking various hedge transactions. Both at the hedge's inception and on an ongoing basis, we formally assess whether the derivatives that are used in hedging relationships are highly effective in offsetting changes in fair values or cash flows of hedged items.
Changes in the fair value of derivative financial instruments that are designated and qualify as fair value hedges along with the gain or loss on the hedged asset or liability attributable to the hedged risk, are recorded in the current period earnings. For qualifying cash flow hedges, the effective portion of the change in the fair value of the derivative financial instruments is recorded in accumulated other comprehensive income, and recognized in the income statement when the hedged cash flows affect earnings. For a derivative designated as hedging the foreign-currency exposure of a net investment in a foreign operation, the gain or loss is reported in accumulated other comprehensive income as part of the cumulative translation adjustment. The ineffective portions of fair value, cash flow, and net investment hedges are immediately recognized in earnings, along with the portion of the change in fair value that is excluded from the assessment of hedge effectiveness, if any.
The hedge accounting treatment described herein is no longer applied if a derivative financial instrument is terminated or the hedge designation is removed or is assessed to be no longer highly effective. For these terminated fair value hedges, any changes to the hedged asset or liability remain as part of the basis of the asset or liability and are recognized into income over the remaining life of the asset or liability. For terminated cash flow hedges, unless it is probable that the forecasted cash flows will not occur within a specified period, any changes in fair value of the derivative financial instrument previously recognized remain in accumulated other comprehensive income, and are reclassified into earnings in the same period that the hedged cash flows affect earnings. The previously recognized net derivative gain or loss for a net investment hedge continues to remain in accumulated other comprehensive income until earnings are impacted by sale or liquidation of the associated foreign operation. In all instances, after hedge accounting is no longer applied, any subsequent changes in fair value of the derivative instrument will be recorded into earnings.
Changes in the fair value of derivative financial instruments held for risk management purposes that are not designated for hedge accounting under GAAP are reported in current period earnings.
Income Taxes
Our income tax expense, deferred tax assets and liabilities, and reserves for unrecognized tax benefits reflect management's best assessment of estimated future taxes to be paid. We are subject to income taxes in the United States and numerous foreign jurisdictions. Significant judgments and estimates are required in determining the consolidated income tax expense.
Deferred income taxes arise from temporary differences between the tax and financial statement recognition of revenue and expense. In evaluating our ability to recover our deferred tax assets within the jurisdiction from which they arise we consider all available positive and negative evidence including scheduled reversals of deferred tax liabilities, projected future taxable income, tax planning strategies and recent financial operations. In projecting future taxable income, we begin with historical results adjusted for the results of discontinued operations and changes in accounting policies and incorporate assumptions including the amount of future state, federal and foreign pretax operating income, the reversal of temporary differences, and the implementation of feasible and prudent tax planning strategies. For additional information regarding our provision for income taxes, refer to Note 22.
We recognize the financial statement effects of uncertain income tax positions when it is more likely than not, based on the technical merits, that the position will be sustained upon examination. Also, we recognize accrued interest and penalties related to uncertain income tax positions in interest expense and other operating expenses, respectively.
Share-based Compensation
Under accounting guidance for share-based compensation, compensation cost recognized includes cost for share-based awards. For certain share-based awards compensation cost is ratably charged to expense over the applicable service periods. For other share-based awards, the awards require liability treatment and are remeasured quarterly at fair value, as determined by the Board of Directors, until they are paid, with changes in fair value charged to compensation expense in the period in which the change occurs. Refer to Note 23 for a discussion of our share-based compensation plans.
Foreign Exchange
Foreign-denominated assets and liabilities resulting from foreign-currency transactions are valued using period-end foreign-exchange rates and the results of operations and cash flows are determined using approximate weighted average exchange rates for the period. Translation adjustments are related to foreign subsidiaries using local currency as their functional currency and are reported as a separate component of accumulated other comprehensive income. We may elect to enter into foreign-currency derivatives to mitigate our exposure to changes in foreign-exchange rates. Refer to Derivative Instruments and Hedging Activities above for a discussion of our hedging activities of the foreign-currency exposure of a net investment in a foreign operation.
Recently Adopted Accounting Standards
Balance Sheet - Disclosures about Offsetting Assets and Liabilities (ASU 2011-11 and ASU 2013-01)
As of January 1, 2013, we adopted ASU 2011-11, which amends ASC 210, Balance Sheet. This ASU contains new disclosure requirements regarding the nature of an entity's rights of offset and related arrangements associated with its financial instruments and derivative instruments. In addition, we adopted ASU 2013-01, which simply clarified the scope of ASU 2011-11. The new disclosures will give financial statement users information about both gross and net exposures. ASU 2011-11 and ASU 2013-01 were required to be applied retrospectively. Since the guidance relates only to disclosure of information, the adoption did not have an impact to our consolidated financial condition or results of operations.
Comprehensive Income - Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (ASU 2013-02)
As of January 1, 2013, we adopted ASU 2013-02, which amends ASC 220, Comprehensive Income. The ASU contains new requirements related to the presentation and disclosure of items that are reclassified out of accumulated other comprehensive income. The new requirements provide financial statement users a more comprehensive view of items that are reclassified out of accumulated other comprehensive income. ASU 2013-02 was required to be applied prospectively. Since the guidance relates only to presentation and disclosure of information, the adoption did not have an impact to our consolidated financial condition or results of operations.
Derivatives and Hedging - Inclusion of the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) as a Benchmark Interest Rate for Hedge Accounting Purposes (ASU 2013-10)
As of July 17, 2013, we adopted ASU 2013-10, which amends ASC 815, Derivatives and Hedging. The ASU established the Fed Funds Effective Swap Rate (OIS) as an additional U.S. benchmark interest rate for hedge accounting purposes. Prior to the ASU's addition of the OIS as a benchmark rate, only interest rates on direct Treasury obligations and the LIBOR swap rate were considered to be such benchmarks. Amendments of the update also remove the restriction on using different benchmark rates for similar hedges. The amendments were effective prospectively when entering into new or redesignating existing hedging relationships on or after July 17, 2013. Since the new guidance simply allows for an additional hedge index to be utilized for hedge accounting purposes, the implementation of this guidance has not had a material effect on our consolidated financial condition or results of operations.
Recently Issued Accounting Standards
Liabilities - Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation Is Fixed at the Reporting Date (ASU 2013-04)
In February 2013, the Financial Accounting Standards Board (FASB) issued ASU 2013-04. This ASU requires an entity to measure obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this guidance is fixed at the reporting date, as the sum of the following: (a) The amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and (b) any additional amount the reporting entity expects to pay on behalf of its co-obligors. It further requires an entity to disclose the nature and amount of the obligation as well as other information about those obligations. ASU 2013-04 will be effective for us on January 1, 2014, with retrospective application required. The adoption of this guidance is not expected to have a material effect on our consolidated financial condition or results of operations.
Foreign Currency Matters - Parent's Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity (ASU 2013-05)
In March 2013, the FASB issued ASU 2013-05. This ASU requires a reporting entity that ceases to have a controlling financial interest, in a subsidiary or group of assets or a business, within a foreign entity to release any related Cumulative Translation Adjustment (CTA) into net income. The CTA should be released into net income only if the sale or transfer results in the complete or substantially complete liquidation of the foreign entity. For an equity method investment that is a foreign entity, a pro rata portion of the CTA should be released into net income upon a partial sale of such an investment. This ASU clarifies that the sale of an investment in a foreign entity includes both events that result in the loss of a controlling financial interest in a foreign entity, irrespective of any retained investment, and events that result in step acquisition under which an acquirer obtains control of an acquiree in which it held an equity interest immediately before the acquisition date. Under these circumstances, the CTA should be released into net income upon their occurrence. ASU 2013-04 will be effective for us prospectively on January 1, 2014. Management is currently assessing the potential impact of the application of this guidance. However, since the guidance is prospective and we have sold or exited substantially all of our international businesses, it is not expected to have a material effect on our consolidated financial condition or results of operations.
Income Taxes - Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (ASU 2013-11)
In July 2013, the FASB issued ASU 2013-11. This ASU requires an unrecognized tax benefit, or a portion of an unrecognized tax benefit, to be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. The guidance further includes an exception that if a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available to settle any additional income taxes that would result from the disallowance of a tax position at the reporting date or the tax law of the applicable jurisdiction does not require the entity to use them and the entity does not intend to use them, the deferred tax asset for such purpose should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The assessment of whether a deferred tax asset is available is based on the unrecognized tax benefit and deferred tax asset that exist at the reporting date and should be made presuming disallowance of the tax position at the reporting date. The amendments are effective for us beginning on January 1, 2014. The amendments should be applied prospectively to all unrecognized tax benefits that exist at the effective date. Early adoption and retrospective application are permitted. The adoption of this guidance is not expected to have a material effect to our consolidated financial condition or results of operations.
Investments - Accounting for Investments in Qualified Affordable Housing Projects (ASU 2014-01)
In January 2014, the FASB issued ASU 2014-01. The amendments in this ASU allow an entity to make an accounting policy election to account for investments in qualified affordable housing projects using a proportional amortization method, if certain conditions are met. Under the election, the entity would amortize the initial cost of the investment in proportion to the tax credits and other benefits received while recognizing the net investment performance in the statement of comprehensive income as a component of income tax expense. The amendments are effective for us beginning on January 1, 2015. The amendments should be applied retrospectively to all periods presented. Early adoption is permitted. Management is assessing the impact of the adoption of this guidance in order to determine if our affordable housing investments will qualify for the election and whether or not we will choose to exercise the election.
Receivables - Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (ASU 2014-04)
In January 2014, the FASB issued ASU 2014-04. The amendments in this ASU clarify the timing for which an entity should reclassify a loan that has been foreclosed or where an in substance repossession to real estate owned. The guidance requires such reclassification to occur when the entity obtains legal title upon completion of foreclosure or the borrower conveys all interest in the residential real estate property to the entity to satisfy the loan through completion of a deed in lieu of foreclosure or similar legal agreement. In addition, the ASU clarifies that redemption rights of the borrower should be ignored for purposes of determining whether legal title has transferred. The amendments are effective for us beginning on January 1, 2015. The amendments can be applied using either a modified retrospective or prospective basis. Under the modified retrospective approach, the entity should record a cumulative-effect adjustment to residential consumer mortgage loans and residential real estate owned as of the beginning of the annual period for which the amendments are effective. Early adoption is permitted. Management is assessing the impact of the adoption of this guidance.

Discontinued_and_Heldforsale_O

Discontinued and Held-for-sale Operations	12 Months Ended
	Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]	'
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	'
	Discontinued and Held-for-sale Operations
	Discontinued Operations
	We classify operations as discontinued when operations and cash flows will be eliminated from our ongoing operations and we do not expect to retain any significant continuing involvement in their operations after the respective sale transactions. For all periods presented, the operating results for these discontinued operations have been removed from continuing operations and presented separately as discontinued operations, net of tax, in the Consolidated Statement of Income. The Notes to the Consolidated Financial Statements have been adjusted to exclude discontinued operations unless otherwise noted.
	Select Mortgage Operations
	During the first quarter of 2013, the operations of ResCap were classified as discontinued. During the second quarter of 2012, we sold the Canadian mortgage operations of ResMor Trust.
	Select Insurance Operations
	During the second quarter of 2013, we sold our Mexican insurance business, ABA Seguros. During the first quarter of 2013, we completed the sale of our U.K.-based operations that provided vehicle service contracts and insurance products internationally. During the second quarter of 2011, we completed the sale of our U.K. consumer property and casualty insurance business.
	Select Automotive Finance Operations
	During the fourth quarter of 2012, we committed to sell our automotive finance operations in Europe and Latin America to General Motors Financial Company, Inc. (GM Financial). On the same date, we entered into an agreement with GM Financial to acquire our international operations and 40% interest in a motor vehicle finance joint venture in China. As of December 31, 2013, our interest in the motor vehicle finance joint venture in China is the only remaining component of the disposal group for which the sale has not been completed. No impairment was recognized to present the operations at the lower-of-cost or fair value. We expect to complete the sale of the joint venture in China during 2014.
	During the fourth quarter of 2013, we completed the sale of our Latin American operations in Brazil. During the second quarter of 2013, we completed the sale of our operations in Europe and the majority of Latin America. The transaction included European operations in Germany, the United Kingdom, Italy, Sweden, Switzerland, Austria, Belgium, France and the Netherlands, and Latin America operations in Mexico, Chile, and Colombia. During the first quarter of 2013, we sold our Canadian automotive finance operations, Ally Credit Canada Limited and ResMor Trust. During the first quarter of 2012, we completed the sale of our Venezuela operations. During the first quarter of 2011, we completed the sale of our Ecuador operations.
	Select Corporate and Other Operations
	During the fourth quarter of 2012, we ceased operations at our Commercial Finance Group's European division and classified it as discontinued.
	Select Financial Information
	Select financial information of discontinued operations is summarized below. The pretax income or loss, including direct costs to transact a sale, includes any impairment recognized to present the operations at the lower-of-cost or fair value. Fair value was based on the estimated sales price, which could differ from the ultimate sales price due to price volatility, changing interest rates, changing foreign-currency rates, and future economic conditions.
	Year ended December 31, ($ in millions)		2013				2012			2011
	Select Mortgage operations
	Total net revenue		$	—			$	439		$	562
	Pretax loss including direct costs to transact a sale (a) (b)		(1,741		)		(1,282		)	(811		)
	Tax (benefit) expense (c)		(592		)		(443		)	2
	Select Insurance operations
	Total net revenue		$	190			$	625		$	710
	Pretax income including direct costs to transact a sale (a)		319			(d)	86			145
	Tax (benefit) expense (c)		(14		)		53			39
	Select Automotive Finance operations
	Total net revenue		$	572			$	1,503		$	1,690
	Pretax income including direct costs to transact a sale (a)		660			(e)	786			820
	Tax (benefit) expense (c)		(101		)		235			92
	Select Corporate and Other operations
	Total net revenue		$	—			$	11		$	7
	Pretax income		—				83			44
	Tax expense		—				2			3
	(a)	Includes certain treasury and other corporate activity recognized by Corporate and Other.
	(b)	Includes the results of ResCap. Refer to Note 1 for more information regarding the Debtors' bankruptcy.
	(c)	Includes certain income tax activity recognized by Corporate and Other.
	(d)	Includes recognized pretax gain of $274 million in connection with the sale of our Mexican insurance business, ABA Seguros.
	(e)	Includes recognized pretax loss of $488 million in connection with the sale of our European and Latin American automotive finance operations and pretax gain of $888 million in connection with the sale of our Canadian automotive finance operations, Ally Credit Canada Limited and ResMor Trust.
	Held-for-sale Operations
	The assets and liabilities of operations held-for-sale are summarized below.
	December 31, ($ in millions)		Select				Select			Total
			Insurance				Automotive Finance			held-for-sale
			operations (a)				operations (b)			operations
	2013
	Assets
	Other assets		$	—			$	516		$	516
	Total assets		$	—			$	516		$	516
	2012
	Assets
	Cash and cash equivalents
	Noninterest-bearing		$	8			$	100		$	108
	Interest-bearing		119				1,918			2,037
	Total cash and cash equivalents		127				2,018			2,145
	Investment securities		576				424			1,000
	Finance receivables and loans, net
	Finance receivables and loans, net of unearned income		—				25,835			25,835
	Allowance for loan losses		—				(208		)	(208		)
	Total finance receivables and loans, net		—				25,627			25,627
	Investment in operating leases, net		—				144			144
	Premiums receivable and other insurance assets		277				—			277
	Other assets		94				2,942			3,036
	Impairment on assets of held-for-sale operations		(53		)		—			(53		)
	Total assets		$	1,021			$	31,155		$	32,176
	Liabilities
	Interest-bearing deposit liabilities		$	—			$	3,907		$	3,907
Short-term borrowings		—				2,800			2,800
Long-term debt		—				13,514			13,514
Interest payable		—				177			177
Unearned insurance premiums and service revenue		506				—			506
Accrued expenses and other liabilities		297				1,498			1,795
Total liabilities		$	803			$	21,896		$	22,699
(a)	Includes our U.K.-based operations that provide vehicle service contracts and insurance products, and ABA Seguros.
(b)	Includes our Canadian operations sold to Royal Bank of Canada and international entities being sold to GM Financial.

Insurance_Premiums_and_Service

Insurance Premiums and Service Revenue Earned	12 Months Ended
	Dec. 31, 2013
Premiums Written and Earned [Abstract]	'
Insurance Premiums and Service Revenue Earned [Text Block]	'
	Insurance Premiums and Service Revenue Earned
	The following table is a summary of insurance premiums and service revenue written and earned.
		2013						2012						2011
	Year ended December 31, ($ in millions)	Written			Earned			Written			Earned			Written			Earned
	Insurance premiums
	Direct	$	270		$	305		$	332		$	335		$	342		$	309
	Assumed	61			58			44			49			38			76
	Gross insurance premiums	331			363			376			384			380			385
	Ceded	(172		)	(120		)	(141		)	(109		)	(129		)	(126		)
	Net insurance premiums	159			243			235			275			251			259
	Service revenue	838			769			826			780			788			894
	Insurance premiums and service revenue written and earned	$	997		$	1,012		$	1,061		$	1,055		$	1,039		$	1,153

Other_Income_Net_Of_Losses

Other Income, Net Of Losses	12 Months Ended
	Dec. 31, 2013
Other Nonoperating Income (Expense) [Abstract]	'
Other Income, Net of Losses [Text Block]	'
	Other Income, Net of Losses
	Details of other income, net of losses, were as follows.
	Year ended December 31, ($ in millions)	2013		2012			2011
	Late charges and other administrative fees	$	94	$	83		$	82
	Remarketing fees	82		63			96
	Mortgage processing fees and other mortgage income	81		475			236
	Fair value adjustment on derivatives (a)	24		(30		)	(125		)
	Securitization income	23		45			199
	Other, net	79		101			133
	Total other income, net of losses	$	383	$	737		$	621
	(a)	Refer to Note 21 for a description of derivative instruments and hedging activities.

Other_Operating_Expenses

Other Operating Expenses	12 Months Ended
	Dec. 31, 2013
Operating Expenses [Abstract]	'
Other Operating Expenses [Text Block]	'
	Other Operating Expenses
	Details of other operating expenses were as follows.
	Year ended December 31, ($ in millions)	2013		2012		2011
	Insurance commissions	$	370	$	382	$	431
	Technology and communications	346		317		342
	Professional services	176		149		171
	Lease and loan administration	173		325		201
	Advertising and marketing	136		145		150
	Regulatory and licensing fees	116		118		124
	Provision for legal and regulatory settlements (a)	105		6		2
	Mortgage representation and warranty obligation, net	104		171		—
	Premises and equipment depreciation	81		76		70
	Vehicle remarketing and repossession	60		52		84
	Occupancy	44		50		47
	Other	270		271		361
	Total other operating expenses	$	1,981	$	2,062	$	1,983
	(a)	Results for the year ended December 31, 2013 include a $98 million settlement charge related to Consent Orders issued by the Consumer Financial Protection Bureau (CFPB) and the U.S. Department of Justice (DOJ) pertaining to the allegation of disparate impact in the automotive finance business. Refer to Note 29 for additional details.

Investment_Securities

Investment Securities	12 Months Ended
	Dec. 31, 2013
Available-for-sale Securities [Abstract]	'
Investment Securities [Text Block]	'
	Investment Securities
	Our portfolio of securities includes bonds, equity securities, asset- and mortgage-backed securities, interests in securitization trusts, and other investments. The cost, fair value, and gross unrealized gains and losses on available-for-sale securities were as follows.
			2013															2012
			Amortized cost			Gross unrealized								Fair				Amortized cost				Gross unrealized						Fair
	December 31, ($ in millions)					gains				losses				value								gains			losses			value
	Available-for-sale securities
	Debt securities
	U.S. Treasury and federal agencies		$	1,495		$	1			$	(69	)		$	1,427			$	2,212			$	3		$	(1	)	$	2,214
	U.S. States and political subdivisions		316			—				(1		)		315				—				—			—			—
	Foreign government		287			4				(3		)		288				295				8			—			303
	Mortgage-backed residential (a)		11,131			49				(398		)		10,782				6,779				130			(3		)	6,906
	Mortgage-backed commercial		39			—				—				39				—				—			—			—
	Asset-backed		2,207			15				(3		)		2,219				2,309				32			(1		)	2,340
	Corporate debt		1,052			23				(6		)		1,069				1,209				57			(3		)	1,263
	Total debt securities		16,527			92				(480		)		16,139				12,804				230			(8		)	13,026
	Equity securities		898			74				(28		)		944				1,193				32			(73		)	1,152
	Total available-for-sale securities (b)		$	17,425		$	166			$	(508	)		$	17,083			$	13,997			$	262		$	(81	)	$	14,178
	(a)	Residential mortgage-backed securities include agency-backed bonds totaling $8,266 million and $4,983 million at December 31, 2013, and December 31, 2012, respectively.
	(b)	Certain entities related to our Insurance operations are required to deposit securities with state regulatory authorities. These deposited securities totaled $15 million and $15 million at December 31, 2013, and December 31, 2012, respectively.
	The maturity distribution of available-for-sale debt securities outstanding is summarized in the following tables. Prepayments may cause actual maturities to differ from scheduled maturities.
			Total						Due in							Due after							Due after					Due after
									one year							one year							five years					ten years (a)
									or less							through							through
																five years							ten years
	($ in millions)		Amount			Yield			Amount				Yield			Amount				Yield			Amount			Yield		Amount			Yield
	December 31, 2013
	Fair value of available-for-sale debt securities (b)
	U.S. Treasury and federal agencies		$	1,427		1.3	%		$	9			3	%		$	766			1.2	%		$	652		1.3	%	$	—		—	%
	U.S. States and political subdivisions		315			3.3			39				1.3			10				0.6			102			2.6		164			4.3
	Foreign government		288			2.7			18				2.7			105				2.4			164			2.9		1			2.7
	Mortgage-backed residential		10,782			2.7			—				—			90				2.1			3			4.2		10,689			2.7
	Mortgage-backed commercial		39			1.3			—				—			—				—			—			—		39			1.3
	Asset-backed		2,219			2			76				2.4			1,483				1.9			491			1.9		169			2.7
	Corporate debt		1,069			4.1			24				3.4			547				3			430			5.3		68			5.7
	Total available-for-sale debt securities		$	16,139		2.5			$	166			2.3			$	3,001			1.9			$	1,842		2.5		$	11,130		2.7
	Amortized cost of available-for-sale debt securities		$	16,527					$	165						$	3,000						$	1,882				$	11,480
	December 31, 2012
	Fair value of available-for-sale debt securities (b)
	U.S. Treasury and federal agencies		$	2,214		0.9	%		$	422			—	%		$	682			0.7	%		$	1,110		1.4	%	$	—		—	%
	Foreign government		303			2.5			1				2.2			136				1.8			166			3		—			—
	Mortgage-backed residential		6,906			2.7			—				—			—				—			35			4.3		6,871			2.7
	Asset-backed		2,340			2.1			—				—			1,543				2			510			1.7		287			3.3
	Corporate debt		1,263			5.1			9				3.2			560				4			596			6		98			5.8
	Total available-for-sale debt securities		$	13,026		2.4			$	432			0.1			$	2,921			2			$	2,417		2.6		$	7,256		2.6
	Amortized cost of available-for-sale debt securities		$	12,804					$	431						$	2,880						$	2,369				$	7,124
	(a)	Investments with no stated maturities are included as contractual maturities of greater than 10 years. Actual maturities may differ due to call or prepayment options.
	(b)	Yields on tax-exempt obligations are computed on a tax-equivalent basis.
	The balances of cash equivalents were $2.4 billion and $3.4 billion at December 31, 2013, and December 31, 2012, respectively, and were composed primarily of money market accounts and short-term securities, including U.S. Treasury bills.
	The following table presents gross gains and losses realized upon the sales of available-for-sale securities and other-than-temporary impairment.
	Year ended December 31, ($ in millions)	2013			2012				2011
	Gross realized gains	$	221		$	241			$	297
	Gross realized losses	(21		)	(34		)		(28		)
	Other-than-temporary impairment	(20		)	(61		)		(11		)
	Other gain on investments, net	$	180		$	146			$	258
	The following table presents interest and dividends on available-for-sale securities.
	Year ended December 31, ($ in millions)	2013			2012				2011
	Taxable interest	$	297		$	262			$	325
	Taxable dividends	25			30				25
	Interest and dividends exempt from U.S. federal income tax	3			—				—
	Interest and dividends on available-for-sale securities	$	325		$	292			$	350
	Certain available-for-sale securities were sold at a loss in 2013, 2012, and 2011 as a result of market conditions within these respective periods (e.g., a downgrade in the rating of a debt security). The table below summarizes available-for-sale securities in an unrealized loss position in accumulated other comprehensive income. Based on the methodology described below that was applied to these securities, we believe that the unrealized losses relate to factors other than credit losses in the current market environment. As of December 31, 2013, we did not have the intent to sell the debt securities with an unrealized loss position in accumulated other comprehensive income, and it is not more likely than not that we will be required to sell these securities before recovery of their amortized cost basis. As of December 31, 2013, we had the ability and intent to hold equity securities with an unrealized loss position in accumulated other comprehensive income, and it is not more likely than not that we will be required to sell these securities before recovery of their amortized cost basis. As a result, we believe that the securities with an unrealized loss position in accumulated other comprehensive income are not considered to be other-than-temporarily impaired at December 31, 2013. Refer to Note 1 for additional information related to investment securities and our methodology for evaluating potential other-than-temporary impairments.
			2013															2012
			Less than							12 months								Less than							12 months
12 months						or longer							12 months							or longer
December 31, ($ in millions)		Fair			Unrealized				Fair				Unrealized				Fair				Unrealized			Fair			Unrealized
		value			loss				value				loss				value				loss			value			loss
Available-for-sale securities
Debt securities
U.S. Treasury and federal agencies		$	1,405		$	(69	)		$	—			$	—			$	244			$	(1	)	$	—		$	—
U.S. States and political subdivisions		212			(1		)		—				—				—				—			—			—
Foreign government		114			(3		)		—				—				11				—			—			—
Mortgage-backed		7,503			(388		)		100				(10		)		493				(2		)	23			(1		)
Asset-backed		407			(3		)		1				—				143				(1		)	1			—
Corporate debt		310			(6		)		3				—				120				(2		)	15			(1		)
Total temporarily impaired debt securities		9,951			(470		)		104				(10		)		1,011				(6		)	39			(2		)
Temporarily impaired equity securities		167			(12		)		100				(16		)		380				(39		)	218			(34		)
Total temporarily impaired available-for-sale securities		$	10,118		$	(482	)		$	204			$	(26	)		$	1,391			$	(45	)	$	257		$	(36	)

Finance_Receivables_And_Loans_

Finance Receivables And Loans, Net	12 Months Ended
	Dec. 31, 2013
Loans and Leases Receivable, Net Reported Amount, by Category Alternative [Abstract]	'
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	'
	Finance Receivables and Loans, Net
	The composition of finance receivables and loans, net, reported at carrying value before allowance for loan losses was as follows.
	December 31, ($ in millions)		2013				2012
	Consumer automobile (a)		$	56,417			$	53,715
	Consumer mortgage (b) (c)		8,444				9,821
	Commercial
	Commercial and industrial
	Automobile		30,948				30,270
	Mortgage		—				—
	Other		1,664				2,697
	Commercial real estate - Automobile		2,855				2,552
	Total commercial		35,467				35,519
	Total finance receivables and loans (d)		$	100,328			$	99,055
	(a)	Includes $1 million of fair value adjustment for loans in hedge accounting relationships at December 31, 2013. Refer to Note 21 for additional information.
	(b)	Includes interest-only mortgage loans of $1.5 billion and $2.1 billion at December 31, 2013, and December 31, 2012, respectively, the majority of which are expected to start principal amortization in 2015 or beyond.
	(c)	Includes domestic consumer mortgages at a fair value of $1 million at December 31, 2013, as a result of fair value option election.
	(d)	Totals are net of unearned income, unamortized premiums and discounts, and deferred fees and costs of $595 million and $895 million at December 31, 2013, and December 31, 2012, respectively.
	The following tables present an analysis of the activity in the allowance for loan losses on finance receivables and loans.
	($ in millions)		Consumer				Consumer				Commercial				Total
			automobile				mortgage
	Allowance at January 1, 2013		$	575			$	452			$	143			$	1,170
	Charge-offs		(639		)		(93		)		(5		)		(737		)
	Recoveries		237				18				10				265
	Net charge-offs		(402		)		(75		)		5				(472		)
	Provision for loan losses		490				13				(2		)		501
	Other		10				(1		)		—				9
	Allowance at December 31, 2013		$	673			$	389			$	146			$	1,208
	Allowance for loan losses
	Individually evaluated for impairment		$	23			$	199			$	26			$	248
	Collectively evaluated for impairment		650				190				120				960
	Loans acquired with deteriorated credit quality		—				—				—				—
	Finance receivables and loans at historical cost
	Ending balance		56,417				8,443				35,467				100,327
	Individually evaluated for impairment		281				919				204				1,404
	Collectively evaluated for impairment		56,128				7,524				35,263				98,915
	Loans acquired with deteriorated credit quality		8				—				—				8
	($ in millions)		Consumer				Consumer				Commercial				Total
			automobile				mortgage
	Allowance at January 1, 2012		$	766			$	516			$	221			$	1,503
	Charge-offs		(616		)		(149		)		(11		)		(776		)
	Recoveries		247				11				44				302
	Net charge-offs		(369		)		(138		)		33				(474		)
	Provision for loan losses		257				86				(14		)		329
	Other (a)		(79		)		(12		)		(97		)		(188		)
	Allowance at December 31, 2012		$	575			$	452			$	143			$	1,170
	Allowance for loan losses
	Individually evaluated for impairment		$	16			$	186			$	26			$	228
	Collectively evaluated for impairment		556				266				117				939
	Loans acquired with deteriorated credit quality		3				—				—				3
	Finance receivables and loans at historical cost
	Ending balance		53,715				9,821				35,519				99,055
	Individually evaluated for impairment		260				873				1,538				2,671
	Collectively evaluated for impairment		53,425				8,948				33,981				96,354
	Loans acquired with deteriorated credit quality		30				—				—				30
	(a)	Includes provision for loan losses relating to discontinued operations of $65 million.
	The following table presents information about significant sales of finance receivables and loans recorded at historical cost and transfers of finance receivables and loans from held-for-investment to held-for-sale.
	December 31, ($ in millions)		2013				2012
	Consumer automobile		$	—			$	1,960
	Consumer mortgage		—				40
	Commercial		65				96
	Total sales and transfers		$	65			$	2,096
	The following table presents an analysis of our past due finance receivables and loans, net, recorded at historical cost reported at carrying value before allowance for loan losses.
	December 31, ($ in millions)		30-59 days				60-89 days				90 days				Total				Current				Total finance
past due			past due				or more				past due				receivables and loans
							past due
2013
Consumer automobile		$	1,145			$	255			$	157			$	1,557			$	54,860			$	56,417
Consumer mortgage		82				31				124				237				8,206				8,443
Commercial
Commercial and industrial
Automobile		—				—				36				36				30,912				30,948
Mortgage		—				—				—				—				—				—
Other		—				—				—				—				1,664				1,664
Commercial real estate - Automobile		—				—				6				6				2,849				2,855
Total commercial		—				—				42				42				35,425				35,467
Total consumer and commercial		$	1,227			$	286			$	323			$	1,836			$	98,491			$	100,327
2012
Consumer automobile		$	920			$	213			$	138			$	1,271			$	52,444			$	53,715
Consumer mortgage		81				43				174				298				9,523				9,821
Commercial
Commercial and industrial
Automobile		—				—				16				16				30,254				30,270
Mortgage		—				—				—				—				—				—
Other		—				—				1				1				2,696				2,697
Commercial real estate - Automobile		—				—				8				8				2,544				2,552
Total commercial		—				—				25				25				35,494				35,519
Total consumer and commercial		$	1,001			$	256			$	337			$	1,594			$	97,461			$	99,055
The following table presents the carrying value before allowance for loan losses of our finance receivables and loans recorded at historical cost on nonaccrual status.
December 31, ($ in millions)		2013				2012
Consumer automobile		$	329			$	260
Consumer mortgage		192				382
Commercial
Commercial and industrial
Automobile		116				146
Mortgage		—				—
Other		74				33
Commercial real estate - Automobile		14				37
Total commercial		204				216
Total consumer and commercial finance receivables and loans		$	725			$	858
Management performs a quarterly analysis of the consumer automobile, consumer mortgage, and commercial portfolios using a range of credit quality indicators to assess the adequacy of the allowance based on historical and current trends. The tables below present the population of loans by quality indicators for our consumer automobile, consumer mortgage, and commercial portfolios.
The following table presents performing and nonperforming credit quality indicators in accordance with our internal accounting policies for our consumer finance receivables and loans recorded at historical cost reported at carrying value before allowance for loan losses. Nonperforming loans include finance receivables and loans on nonaccrual status when the principal or interest has been delinquent for 90 days or when full collection is determined not to be probable. Refer to Note 1 for additional information.
		2013												2012
December 31, ($ in millions)		Performing				Nonperforming				Total				Performing				Nonperforming				Total
Consumer automobile		$	56,088			$	329			$	56,417			$	53,455			$	260			$	53,715
Consumer mortgage		8,251				192				8,443				9,439				382				9,821
The following table presents pass and criticized credit quality indicators based on regulatory definitions for our commercial finance receivables and loans recorded at historical cost reported at carrying value before allowance for loan losses.
		2013												2012
December 31, ($ in millions)		Pass				Criticized (a)				Total				Pass				Criticized (a)				Total
Commercial
Commercial and industrial
Automobile		$	29,194			$	1,754			$	30,948			$	28,978			$	1,292			$	30,270
Mortgage		—				—				—				—				—				—
Other		1,388				276				1,664				2,417				280				2,697
Commercial real estate - Automobile		2,770				85				2,855				2,440				112				2,552
Total commercial		$	33,352			$	2,115			$	35,467			$	33,835			$	1,684			$	35,519
(a)	Includes loans classified as special mention, substandard, or doubtful. These classifications are based on regulatory definitions and generally represent loans within our portfolio that have a higher default risk or have already defaulted.
Impaired Loans and Troubled Debt Restructurings
Impaired Loans
Loans are considered impaired when we determine it is probable that we will be unable to collect all amounts due according to the terms of the loan agreement. For more information on our impaired finance receivables and loans, refer to Note 1.
The following table presents information about our impaired finance receivables and loans recorded at historical cost.
December 31, ($ in millions)		Unpaid principal balance				Carrying value before allowance				Impaired with no allowance				Impaired with an allowance				Allowance for impaired loans
2013
Consumer automobile		$	281			$	281			$	—			$	281			$	23
Consumer mortgage		924				919				128				791				199
Commercial
Commercial and industrial
Automobile		116				116				57				59				7
Mortgage		—				—				—				—				—
Other		74				74				—				74				16
Commercial real estate - Automobile		14				14				9				5				3
Total commercial		204				204				66				138				26
Total consumer and commercial finance receivables and loans		$	1,409			$	1,404			$	194			$	1,210			$	248
2012
Consumer automobile		$	260			$	260			$	90			$	170			$	16
Consumer mortgage		958				873				124				749				186
Commercial
Commercial and industrial
Automobile		146				146				54				92				7
Mortgage		—				—				—				—				—
Other		33				33				9				24				7
Commercial real estate - Automobile		37				37				9				28				12
Total commercial		216				216				72				144				26
Total consumer and commercial finance receivables and loans		$	1,434			$	1,349			$	286			$	1,063			$	228
The following tables present average balance and interest income for our impaired finance receivables and loans.
		2013								2012								2011
Year ended December 31, ($ in millions)		Average				Interest				Average				Interest				Average				Interest
		balance				income				balance				income				balance				income
Consumer automobile		$	278			$	18			$	131			$	12			$	35			$	2
Consumer mortgage		908				29				693				28				553				22
Commercial
Commercial and industrial
Automobile		152				6				178				8				303				19
Mortgage		—				—				5				—				19				6
Other		72				2				32				6				84				1
Commercial real estate
Automobile		29				1				64				1				126				7
Mortgage		—				—				6				—				40				1
Total commercial		253				9				285				15				572				34
Total consumer and commercial finance receivables and loans		$	1,439			$	56			$	1,109			$	55			$	1,160			$	58
Troubled Debt Restructurings
TDRs are loan modifications where concessions were granted to borrowers experiencing financial difficulties. Numerous initiatives are in place to provide support to our mortgage customers in financial distress, including principal forgiveness, maturity extensions, delinquent interest capitalization, and changes to contractual interest rates. Additionally for automobile loans, we may offer several types of assistance to aid our customers, including extension of the loan maturity date and rewriting the loan terms. Total TDRs recorded at historical cost and reported at carrying value before allowance for loan losses were $1.3 billion at December 31, 2013, reflecting an increase of $112 million from December 31, 2012. Refer to Note 1 for additional information.
The following table presents information related to finance receivables and loans recorded at historical cost modified in connection with a TDR during the period.
		2013 (a)											2012 (a)
Year ended December 31, ($ in millions)		Number of			Pre-modification				Post-modification				Number of			Pre-modification				Post-modification
		loans			carrying value before				carrying value before				loans			carrying value before				carrying value before
					allowance				allowance							allowance				allowance
Consumer automobile		19,388			$	297			$	249			36,285			$	407			$	295
Consumer mortgage		1,092			278				234				2,969			436				350
Commercial
Commercial and industrial
Automobile		8			37				37				9			15				15
Mortgage		—			—				—				—			—				—
Other		4			80				78				—			—				—
Commercial real estate - Automobile		5			20				20				8			14				13
Total commercial		17			137				135				17			29				28
Total consumer and commercial finance receivables and loans		20,497			$	712			$	618			39,271			$	872			$	673
(a)	Due to recent industry practice, bankruptcy loans that have not been reaffirmed have been included within our TDR population beginning in the fourth quarter of 2012.
The following table presents information about finance receivables and loans recorded at historical cost that have redefaulted during the reporting period and were within 12 months or less of being modified as a TDR. Redefault is when finance receivables and loans meet the requirements for evaluation under our charge-off policy (Refer to Note 1 for additional information) except for commercial finance receivables and loans, where redefault is defined as 90 days past due.
		2013 (a)											2012 (a)
Year ended December 31, ($ in millions)		Number of			Carrying value				Charge-off amount				Number of			Carrying value				Charge-off amount
		loans			before allowance								loans			before allowance
Consumer automobile		6,038			$	75			$	37			2,290			$	26			$	12
Consumer mortgage		32			8				1				153			19				3
Commercial
Commercial and industrial - Automobile		—			—				—				4			3				—
Commercial real estate - Automobile		—			—				—				3			3				—
Total commercial		—			—				—				7			6				—
Total consumer and commercial finance receivables and loans		6,070			$	83			$	38			2,450			$	51			$	15
(a)	Due to recent industry practice, bankruptcy loans that have not been reaffirmed have been included within our TDR population beginning in the fourth quarter of 2012.
At December 31, 2013, and December 31, 2012, commercial commitments to lend additional funds to debtors owing receivables whose terms had been modified in a TDR were $26 million and $25 million, respectively.
Concentration Risk
Consumer
We monitor our consumer loan portfolio for concentration risk across the geographies in which we lend. The highest concentrations of loans are in Texas and California, which represent an aggregate of 21.1% of our total outstanding consumer finance receivables and loans at December 31, 2013.
Concentrations in our mortgage portfolio are closely monitored given the volatility of the housing markets. Our consumer mortgage loan concentrations in California, Florida, and Michigan receive particular attention as the real estate value depreciation in these states has been the most severe.
The following table shows the percentage of total consumer finance receivables and loans recorded at historical cost reported at carrying value before allowance for loan losses by geographic region.
	2013 (a)						2012
December 31,	Automobile			1st Mortgage and home equity			Automobile			1st Mortgage and home equity
Texas	13.2	%		5.8	%		12.9	%		5.8	%
California	5.8			29.5			5.6			29.2
Florida	7			3.6			6.7			3.6
Pennsylvania	5.3			1.7			5.2			1.6
Illinois	4.4			4.4			4.3			4.8
Michigan	4.4			3.9			5			4.1
New York	4.3			1.9			4.6			2
Georgia	4			2.1			3.7			1.9
Ohio	4			0.7			4			0.8
North Carolina	3.4			1.9			3.3			2
Other United States	44.2			44.5			44.7			44.2
Total consumer loans	100	%		100	%		100	%		100	%
(a)	Presentation is in descending order as a percentage of total consumer finance receivables and loans at December 31, 2013.
Commercial Real Estate
The commercial real estate portfolio consists of loans issued primarily to automotive dealers. The following table shows the percentage of total commercial real estate finance receivables and loans reported at carrying value before allowance for loan losses by geographic region.
December 31,	2013			2012
Geographic region
Texas	13.2	%		13	%
Florida	12.6			11.7
Michigan	11.6			12.6
California	9.2			9.3
New York	4.5			4.9
North Carolina	4.1			3.9
Virginia	3.8			3.9
Pennsylvania	3.3			3.3
Georgia	3.1			3
Illinois	2.5			1.8
Other United States	32.1			32.6
Total commercial real estate finance receivables and loans	100	%		100	%
Commercial Criticized Exposure
Finance receivables and loans classified as special mention, substandard, or doubtful are deemed as criticized. These classifications are based on regulatory definitions and generally represent finance receivables and loans within our portfolio that have a higher default risk or have already defaulted. The following table presents the percentage of total commercial criticized finance receivables and loans reported at carrying value before allowance for loan losses by industry concentrations.
December 31,	2013			2012
Industry
Automotive	91.4	%		85.7	%
Electronics	3.4			1.2
Services	2.5			4.9
Other	2.7			8.2
Total commercial criticized finance receivables and loans	100	%		100	%

Investment_In_Operating_Leases

Investment In Operating Leases, Net	12 Months Ended
	Dec. 31, 2013
Leases, Operating [Abstract]	'
Operating Leases of Lessor Disclosure [Text Block]	'
	Investment in Operating Leases, Net
	Investments in operating leases were as follows.
	December 31, ($ in millions)		2013				2012
	Vehicles and other equipment		$	21,125			$	16,009
	Accumulated depreciation		(3,445		)		(2,459		)
	Investment in operating leases, net		$	17,680			$	13,550
	Depreciation expense on operating lease assets includes remarketing gains and losses recognized on the sale of operating lease assets. The following summarizes the components of depreciation expense on operating lease assets.
	Year ended December 31, ($ in millions)	2013				2012				2011
	Depreciation expense on operating lease assets (excluding remarketing gains)	$	2,327			$	1,515			$	1,158
	Remarketing gains	(332		)		(116		)		(217		)
	Depreciation expense on operating lease assets	$	1,995			$	1,399			$	941
	The following table presents the future lease nonresidual rental payments due from customers for equipment on operating leases.
	Year ended December 31, ($ in millions)
	2014	$	2,942
	2015	1,890
	2016	733
	2017	22
	2018 and after	—
	Total	$	5,587

Securitizations_And_Variable_I

Securitizations And Variable Interest Entities	12 Months Ended
	Dec. 31, 2013
Securitizations And Variable Interest Entities [Abstract]	'
Securitizations And Variable Interest Entities Disclosure [Text Block]	'
	Securitizations and Variable Interest Entities
	Overview
	We are involved in several types of securitization and financing transactions that utilize special-purpose entities (SPEs). An SPE is an entity that is designed to fulfill a specified limited need of the sponsor. Our principal use of SPEs is to obtain liquidity by securitizing certain of our financial assets and operating lease assets.
	The SPEs involved in our securitization and other financing transactions are generally considered variable interest entities (VIEs). VIEs are entities that have either a total equity investment that is insufficient to permit the entity to finance its activities without additional subordinated financial support or whose equity investors lack the ability to control the entity's activities.
	Due to the deconsolidation of ResCap, our mortgage securitization activity and involvement with certain mortgage-related VIEs has substantially decreased. Refer to Note 1 for additional information related to ResCap. We no longer securitize consumer mortgage loans through transactions involving GSEs, or through private-label mortgage securitizations. Accordingly, the discussion below represents our current involvement with variable interest entities as of December 31, 2013, except where otherwise stated or where comparative information is presented.
	Securitizations
	We provide a wide range of consumer and commercial automobile loans, operating leases, and commercial loans to a diverse customer base. We often securitize these loans (also referred to as financial assets) and leases through the use of securitization entities, which may or may not be consolidated on our Consolidated Balance Sheet. We securitize consumer and commercial automobile loans, operating leases, and other commercial loans through private-label securitizations.
	In executing a securitization transaction, we typically sell pools of financial assets to a wholly owned, bankruptcy-remote SPE, which then transfers the financial assets to a separate, transaction-specific securitization entity for cash, servicing rights, and in some transactions, other retained interests. The securitization entity is funded through the issuance of beneficial interests in the securitized financial assets. The beneficial interests take the form of either notes or trust certificates, which are sold to investors and/or retained by us. These beneficial interests are collateralized by the transferred leases and loans and entitle the investors to specified cash flows generated from the underlying securitized assets. In addition to providing a source of liquidity and cost-efficient funding, securitizing these leases and financial assets also reduces our credit exposure to the borrowers beyond any economic interest we may retain.
	Each securitization is governed by various legal documents that limit and specify the activities of the securitization entity. The securitization entity is generally allowed to acquire the loans, to issue beneficial interests to investors to fund the acquisition of the loans, and to enter into derivatives or other yield maintenance contracts to hedge or mitigate certain risks related to the financial assets or beneficial interests of the entity. A servicer, who is generally us, is appointed pursuant to the underlying legal documents to service the assets the securitization entity holds and the beneficial interests it issues. Servicing functions include, but are not limited to, general collection activity on current and noncurrent accounts, loss mitigation efforts including repossession and sale of collateral, as well as advancing principal and interest payments before collecting them from individual borrowers. Our servicing responsibilities, which constitute continued involvement in the transferred financial assets, consist of primary servicing (i.e., servicing the underlying transferred financial assets) and master servicing (i.e., servicing the beneficial interests that result from the securitization transactions).
	Cash flows from the assets initially transferred into the securitization entity represent the sole source for payment of distributions on the beneficial interests issued by the securitization entity and for payments to the parties that perform services for the securitization entity, such as the servicer or the trustee. In certain securitization transactions, a liquidity facility may exist to provide temporary liquidity to the entity. The liquidity provider generally is reimbursed prior to other parties in subsequent distribution periods.
	We typically hold retained beneficial interests in our securitizations, which may represent a form of significant continuing economic interest. These retained interests include, but are not limited to, senior or subordinate asset-backed securities and residuals; and other residual interests. Certain of these retained interests provide credit enhancement to the trust as they may absorb credit losses or other cash shortfalls. Additionally, the securitization agreements may require cash flows to be directed away from certain of our retained interests due to specific over-collateralization requirements, which may or may not be performance-driven.
	We generally hold certain conditional repurchase options specific to securitizations that allow us to repurchase assets from the securitization entity. The majority of the securitizations provide us, as servicer, with a call option that allows us to repurchase the remaining transferred financial assets or outstanding beneficial interests at our discretion once the asset pool reaches a predefined level, which represents the point where servicing becomes burdensome (a clean-up call option). The repurchase price is typically the par amount of the loans plus accrued interest. Additionally, we may hold other conditional repurchase options that allow us to repurchase a transferred financial asset if certain events outside our control occur. The typical conditional repurchase option is a delinquent loan repurchase option that gives us the option to purchase the loan or contract if it exceeds a certain prespecified delinquency level. We generally have discretion regarding when or if we will exercise these options, but we would do so only when it is in our best interest.
	Other than customary representation and warranty provisions, these securitizations are nonrecourse to us, thereby transferring the risk of future credit losses to the extent the beneficial interests in the securitization entities are held by third parties. Representation and warranty provisions generally require us to repurchase loans or indemnify the investor or other party for incurred losses to the extent it is determined that the loans were ineligible or were otherwise defective at the time of sale. Refer to Note 29 for detail on representation and warranty provisions. We did not provide any noncontractual financial support to any of these entities during 2013 or 2012.
	Consolidation of Variable Interest Entities
	The determination of whether the assets and liabilities of the VIEs are consolidated on our balance sheet (also referred to as on-balance sheet) or not consolidated on our balance sheet (also referred to as off-balance sheet) depends on the terms of the related transaction and our continuing involvement (if any) with the VIE. We are deemed the primary beneficiary and therefore consolidate VIEs for which we have both (a) the power, through voting rights or similar rights, to direct the activities that most significantly impact the VIE's economic performance, and (b) a variable interest (or variable interests) that (i) obligates us to absorb losses that could potentially be significant to the VIE and/or (ii) provides us the right to receive residual returns of the VIE that could potentially be significant to the VIE. We determine whether we hold a significant variable interest in a VIE based on a consideration of both qualitative and quantitative factors regarding the nature, size, and form of our involvement with the VIE. We assess whether we are the primary beneficiary of a VIE on an ongoing basis.
	We are generally determined to be the primary beneficiary in VIEs established for our securitization activities when we have a controlling financial interest in the VIE, primarily due to our servicing activities, and we hold a significant beneficial interest in the VIE. The consolidated VIEs included in the Consolidated Balance Sheet represent separate entities with which we are involved. The third-party investors in the obligations of consolidated VIEs have legal recourse only to the assets of the VIEs and do not have such recourse to us, except for the customary representation and warranty provisions or when we are the counterparty to certain derivative transactions involving the VIE. In addition, the cash flows from the assets are restricted only to pay such liabilities. Thus, our economic exposure to loss from outstanding third-party financing related to consolidated VIEs is significantly less than the carrying value of the consolidated VIE assets. All assets of consolidated VIEs, presented below based upon the legal transfer of the underlying assets in order to reflect legal ownership, are restricted for the benefit of the beneficial interest holders. Refer to Note 24 for discussion of the assets and liabilities for which the fair value option has been elected.
	The nature, purpose, and activities of nonconsolidated securitization entities are similar to those of our consolidated securitization entities with the primary difference being the nature and extent of our continuing involvement. We are generally not determined to be the primary beneficiary in VIEs established for our securitization activities when we either do not hold potentially significant variable interests or do not provide servicing or asset management functions for the financial assets held by the securitization entity. Additionally, to qualify for off-balance sheet treatment, transfers of financial assets must meet appropriate sale accounting conditions. For nonconsolidated securitization entities, the transferred financial assets are removed from our balance sheet provided the conditions for sale accounting are met. The financial assets obtained from the securitization are primarily reported as cash, servicing rights, or retained interests (if applicable). Typically, we conclude that the fee we are paid for servicing consumer automobile finance receivables represents adequate compensation, and consequently, we do not recognize a servicing asset or liability. Liabilities incurred as part of these securitization transactions, such as representation and warranty provisions, are recorded at fair value at the time of sale and are reported as accrued expenses and other liabilities on our Consolidated Balance Sheet. Upon the sale of the loans, we recognize a gain or loss on sale for the difference between the assets recognized, the assets derecognized, and the liabilities recognized as part of the transaction.
	The pretax gains recognized on financial assets sold into nonconsolidated securitization and similar asset-backed financing entities for consumer mortgage - GSEs were $112 million, $629 million, and $131 million for the years ended December 31, 2013, 2012, and 2011, respectively. There were no pretax gains recognized for consumer automobile for the years ended December 31, 2013 and 2011, and $6 million for the year ended December 31, 2012.
	We have involvement with various other on-balance sheet, immaterial VIEs. Most of these VIEs are used for additional liquidity whereby we sell certain financial assets into the VIE and issue beneficial interests to third parties for cash. We also provide long-term guarantee contracts to investors in certain nonconsolidated affordable housing entities and have extended a line of credit to provide liquidity and minimize our exposure under these contracts. Since we do not have control over the entities or the power to make decisions, we do not consolidate the entities and our involvement is limited to the guarantee and the line of credit.
	Our involvement with consolidated and nonconsolidated VIEs in which we hold variable interests is presented below.
	December 31, ($ in millions)		Consolidated				Assets of				Maximum exposure to
			involvement				nonconsolidated				loss in nonconsolidated
			with VIEs (a)				VIEs (a)				VIEs
	2013
	On-balance sheet variable interest entities
	Consumer automobile		$	19,072
	Commercial automobile		20,511
	Commercial other		564
	Off-balance sheet variable interest entities
	Consumer automobile		—				$	899			$	899		(b)
	Commercial other		(24		)	(c)	—			(d)	40
	Total		$	40,123			$	899			$	939
	2012
	On-balance sheet variable interest entities
	Consumer automobile		$	28,566
	Commercial automobile		23,139
	Commercial other		728
	Off-balance sheet variable interest entities
	Consumer automobile		—				$	1,495			$	1,495		(b)
	Consumer mortgage — other		—				—			(d)	12			(e)
	Commercial other		(28		)	(c)	—			(d)	85
	Total		$	52,405			$	1,495			$	1,592
	(a)	Asset values represent the current unpaid principal balance of outstanding consumer finance receivables and loans within the VIEs.
	(b)	Maximum exposure to loss represents the current unpaid principal balance of outstanding loans based on our customary representation and warranty provisions. This measure is based on the unlikely event that all of the loans have underwriting defects or other defects that trigger a representation and warranty provision and the collateral supporting the loans are worthless. This required disclosure is not an indication of our expected loss.
	(c)	Amounts classified as accrued expenses and other liabilities.
	(d)	Includes a VIE for which we have no management oversight and therefore we are not able to provide the total assets of the VIEs.
	(e)	Our maximum exposure to loss in this VIE is a component of servicer advances made that are allocated to the trust. The maximum exposure to loss presented represents the unlikely event that every loan underlying the excess servicing rights sold defaults, and we, as servicer, are required to advance the entire excess service fee to the trust for the contractually established period. This required disclosure is not an indication of our expected loss.
	On-balance Sheet Variable Interest Entities
	The consolidated VIEs included in the Consolidated Balance Sheet represent separate entities with which we are involved. The third-party investors in the obligations of consolidated VIEs have legal recourse only to the assets of the VIEs and do not have such recourse to us, except for the customary representation and warranty provisions or when we are the counterparty to certain derivative transactions involving the VIE. In addition, the cash flows from the assets are restricted only to pay such liabilities. Thus, our economic exposure to loss from outstanding third-party financing related to consolidated VIEs is significantly less than the carrying value of the consolidated VIE assets. All assets of consolidated VIEs, presented below based upon the legal transfer of the underlying assets in order to reflect legal ownership, are restricted for the benefit of the beneficial interest holders. Refer to Note 24 for discussion of the assets and liabilities for which the fair value option has been elected.
	December 31, ($ in millions)	2013				2012
	Assets
	Finance receivables and loans, net
	Consumer	$	13,291			$	13,671
	Commercial	18,974				17,839
	Allowance for loan losses	(174		)		(144		)
	Total finance receivables and loans, net	32,091				31,366
	Investment in operating leases, net	4,620				6,060
	Other assets	3,436				2,868
	Assets of operations held-for-sale	—				12,139
	Total assets	$	40,147			$	52,433
	Liabilities
	Short-term borrowings	$	250			$	400
	Long-term debt	24,147				26,461
Interest payable	—				1
Accrued expenses and other liabilities	43				16
Liabilities of operations held-for-sale	—				9,686
Total liabilities	$	24,440			$	36,564
Cash Flows with Off-balance Sheet Variable Interest Entities
The following table summarizes cash flows received and paid related to securitization entities, asset-backed financings, or other similar transfers of financial assets where the transfer is accounted for as a sale and we have a continuing involvement with the transferred assets (e.g., servicing) that were outstanding in 2013, 2012, and 2011. Additionally, this table contains information regarding cash flows received from and paid to nonconsolidated securitization entities that existed during each period.
Year ended December 31, ($ in millions)		Consumer automobile				Consumer				Consumer mortgage
						mortgage GSEs				private-label
2013
Cash proceeds from transfers completed during the period		$	—			$	8,676			$	—
Servicing fees		13				70				—
Representations and warranties obligations		—				(66		)		—
Other cash flows		—				70				—
2012
Cash proceeds from transfers completed during the period		$	1,979			$	32,796			$	5
Cash flows received on retained interests in securitization entities		—				—				71
Servicing fees		12				693				63
Purchases of previously transferred financial assets		—				(876		)		(12		)
Representations and warranties obligations		—				(108		)		(7		)
Other cash flows		—				(96		)		255
2011
Cash proceeds from transfers completed during the period		$	—			$	59,815			$	722
Cash flows received on retained interests in securitization entities		—				—				68
Servicing fees		—				999				201
Purchases of previously transferred financial assets		—				(2,537		)		(222		)
Representations and warranties obligations		—				(143		)		(38		)
Other cash flows		—				(13		)		187
The following tables represent on-balance sheet loans held-for-sale and finance receivable and loans, off-balance sheet securitizations, and whole-loan sales where we have continuing involvement. The table presents quantitative information about delinquencies and net credit losses.
		Total Amount								Amount 60 days or more past due						Net credit losses
December 31, ($ in millions)		2013				2012				2013				2012		2013			2012
On-balance sheet loans
Consumer automobile		$	56,417			$	53,715			$	412			$	351	$	402		$	369
Consumer mortgage		8,460				12,311				164				241		75			8
Commercial automobile		33,803				32,822				42				24		2			(1		)
Commercial mortgage		—				—				—				—		—			(1		)
Commercial other		1,683				2,783				—				1		(7		)	(31		)
Total on-balance sheet loans		100,363				101,631				618				617		472			344
Off-balance sheet securitization entities
Consumer automobile		899				1,495				3				4		3			2
Consumer mortgage - GSEs (a)		—				119,384				—				1,892		n/m			n/m
Total off-balance sheet securitization entities		899				120,879				3				1,896		3			2
Whole-loan transactions (b)		2,848				6,756				69				129		6			16
Total		$	104,110			$	229,266			$	690			$	2,642	$	481		$	362
n/m =160;not meaningful
(a)	Anticipated credit losses are not meaningful due to the GSE guarantees.
(b)	Whole-loan transactions are not part of a securitization transaction, but represent consumer automobile and consumer mortgage pools of loans sold to third-party investors.

Servicing_Activities

Servicing Activities	12 Months Ended
	Dec. 31, 2013
Servicing Activities [Abstract]	'
Servicing Activities [Text Block]	'
	Servicing Activities
	Mortgage Servicing Rights
	The following table summarizes past activity related to mortgage servicing rights (MSRs), which were carried at fair value. Management estimated fair value using our transaction data and other market data or, in periods when there were limited MSRs market transactions that were directly observable, internally developed discounted cash flow models (an income approach) were used to estimate the fair value. These internal valuation models estimated net cash flows based on internal operating assumptions that we believed 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 believed approximate yields required by investors in this asset.
	Year ended December 31, ($ in millions)		2013				2012 (a)
	Estimated fair value at January 1,		$	952			$	2,519
	Additions		60				240
	Sales (b)		(911		)		—
	Changes in fair value
	Due to changes in valuation inputs or assumptions used in the valuation model		(32		)		(282		)
	Other changes in fair value		(69		)		(395		)
	Deconsolidation of ResCap		—				(1,130		)
	Estimated fair value at December 31,		$	—			$	952
	(a)	Includes activities of our discontinued operations.
	(b)	Includes the sales of agency MSRs to Ocwen Financial Corp. (Ocwen) and Quicken Loans, Inc. (Quicken) on April 1, 2013 and April 16, 2013, respectively.
	Changes in fair value due to changes in valuation inputs or assumptions used in the valuation model included all changes due to a revaluation by a model or by a benchmarking exercise. Other changes in fair value primarily included the accretion of the present value of the discount related to forecasted cash flows and the economic runoff of the portfolio.
	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)		December 31, 2013		December 31, 2012
	Weighted average life (in years)		n/a		4.6
	Weighted average prepayment speed		n/a		13.5		%
	Impact on fair value of 10% adverse change		n/a		$	(77	)
	Impact on fair value of 20% adverse change		n/a		(144		)
	Weighted average discount rate		n/a		7.7		%
	Impact on fair value of 10% adverse change		n/a		$	(10	)
	Impact on fair value of 20% adverse change		n/a		(19		)
	n/a =160;not applicable
	These sensitivities are hypothetical and should be considered with caution. Changes in fair value based on a 10% and 20% variation in assumptions generally cannot be extrapolated because the relationship of the change in assumptions to the change in fair value may not be linear. Also, the effect of a variation in a particular assumption on the fair value is calculated without changing any other assumption. In reality, changes in one factor may result in changes in another (e.g., increased market interest rates may result in lower prepayments and increased credit losses) that could magnify or counteract the sensitivities. Further, these sensitivities show only the change in the asset balances and do not show any expected change in the fair value of the instruments used to manage the interest rates and prepayment risks associated with these assets.
	Risk Mitigation Activities
	The primary risk of servicing rights is interest rate risk and the resulting impact on prepayments. A significant decline in interest rates could lead to higher-than-expected prepayments that could reduce the value of the MSRs. We previously economically hedged the impact of these risks with both derivative and nonderivative financial instruments. Refer to Note 21 for additional information regarding the derivative financial instruments used to economically hedge MSRs.
	The components of servicing valuation and hedge activities, net, were as follows.
	Year ended December 31, ($ in millions)	2013				2012				2011
	Change in estimated fair value of mortgage servicing rights	$	(101	)		$	(560	)		$	(793	)
	Change in fair value of derivative financial instruments	(112		)		556				359
	Servicing asset valuation and hedge activities, net	$	(213	)		$	(4	)		$	(434	)
	Mortgage Servicing Fees
	The components of mortgage servicing fees were as follows.
	Year ended December 31, ($ in millions)	2013				2012				2011
	Contractual servicing fees, net of guarantee fees and including subservicing	$	62			$	281			$	344
	Late fees	2				7				9
	Ancillary fees	4				12				12
	Total mortgage servicing fees	$	68			$	300			$	365
	Automobile Finance Servicing Activities
	We service consumer automobile contracts. Historically, we have sold a portion of our consumer automobile contracts. With respect to contracts we sell, we retain the right to service and earn a servicing fee for our servicing function. Typically, we conclude that the fee we are paid for servicing consumer automobile finance receivables represents adequate compensation, and consequently, we do not recognize a servicing asset or liability. We recognized automobile servicing fee income of $58 million, $109 million, and $160 million during the years ended December 31, 2013, 2012, and 2011, respectively.
	Automobile Finance Serviced Assets
	The total serviced automobile finance loans and leases outstanding were as follows.
	December 31, ($ in millions)		2013				2012
	On-balance sheet automobile finance loans and leases
	Consumer automobile		$	56,417			$	53,715
	Commercial automobile		33,803				32,822
	Operating leases		17,680				13,550
	Operations held-for-sale		—				25,979
	Other		54				41
	Off-balance sheet automobile finance loans
	Loans sold to third-party investors
	Securitizations		887				1,474
	Whole-loan		2,748				6,541
	Total serviced automobile finance loans and leases		$	111,589			$	134,122

Premiums_Receivable_and_Other_

Premiums Receivable and Other Insurance Assets	12 Months Ended
	Dec. 31, 2013
Premiums Receivable and Other Insurance Assets [Abstract]	'
Premiums Receivable Note [Text Block]	'
	Premiums Receivable and Other Insurance Assets
	Premiums receivable and other insurance assets consisted of the following.
	December 31, ($ in millions)	2013		2012
	Prepaid reinsurance premiums	$	288	$	236
	Reinsurance recoverable on unpaid losses	182		234
	Reinsurance recoverable on paid losses	13		40
	Premiums receivable	85		108
	Deferred policy acquisition costs	1,045		991
	Total premiums receivable and other insurance assets	$	1,613	$	1,609

Other_Assets

Other Assets	12 Months Ended
	Dec. 31, 2013
Other Assets [Abstract]	'
Other Assets Disclosure [Text Block]	'
	Other Assets
	The components of other assets were as follows.
	December 31, ($ in millions)		2013			2012
	Property and equipment at cost		$	709		$	693
	Accumulated depreciation		(474		)	(411		)
	Net property and equipment		235			282
	Restricted cash collections for securitization trusts (a)		3,664			2,983
	Deferred tax asset		2,040			1,190
	Cash reserve deposits held-for-securitization trusts (b)		402			442
	Fair value of derivative contracts in receivable position (c)		362			2,298
	Nonmarketable equity securities		337			303
	Collateral placed with counterparties		328			1,290
	Unamortized debt issuance costs		312			425
	Other accounts receivable		290			525
	Restricted cash and cash equivalents		205			889
	Other assets		1,414			1,281
	Total other assets		$	9,589		$	11,908
	(a)	Represents cash collection from customer payments on securitized receivables. These funds are distributed to investors as payments on the related secured debt.
	(b)	Represents credit enhancement in the form of cash reserves for various securitization transactions.
	(c)	For additional information on derivative instruments and hedging activities, refer to Note 21.

Deposit_Liabilities

Deposit Liabilities	12 Months Ended
	Dec. 31, 2013
Deposits [Abstract]	'
Deposit Liabilities Disclosures [Text Block]	'
	Deposit Liabilities
	Deposit liabilities consisted of the following.
	December 31, ($ in millions)		2013		2012
	Domestic deposits
	Noninterest-bearing deposits		$	60	$	1,977
	Interest-bearing deposits
	Savings and money market checking accounts		21,210		13,871
	Certificates of deposit		31,640		31,084
	Dealer deposits		440		983
	Total deposit liabilities		$	53,350	$	47,915
	Historically, noninterest-bearing deposits primarily represented third-party escrows associated with our mortgage loan-servicing portfolio. See Note 10 for further detail relating to our MSRs sales during 2013. The escrow deposits are not subject to an executed agreement and can be withdrawn without penalty at any time. At December 31, 2013, and December 31, 2012, certificates of deposit included $13.1 billion and $12.0 billion, respectively, of domestic certificates of deposit in denominations of $100 thousand or more.
	The following table presents the scheduled maturity of total certificates of deposit.
	($ in millions)
	Due in 2014	$	15,483
	Due in 2015	8,709
	Due in 2016	4,275
	Due in 2017	2,142
	Due in 2018	1,031
	Total certificates of deposit	$	31,640

ShortTerm_Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2013
Short-term Debt [Abstract]	'
Short-term Debt [Text Block]	'
	Short-term Borrowings
	The following table presents the composition of our short-term borrowings portfolio.
			2013							2012
	December 31, ($ in millions)		Unsecured		Secured (a)		Total			Unsecured		Secured (a)		Total
	Demand notes		$	3,225	$	—	$	3,225		$	3,094	$	—	$	3,094
	Bank loans and overdrafts		—		—		—			167		—		167
	Federal Home Loan Bank		—		3,570		3,570			—		3,800		3,800
	Securities sold under agreements to repurchase (b)		—		1,500		1,500			—		—		—
	Other (c)		—		250		250			—		400		400
	Total short-term borrowings		$	3,225	$	5,320	$	8,545		$	3,261	$	4,200	$	7,461
	Weighted average interest rate (d)						0.8		%					1		%
	(a)	Refer to Note 15 for further details on assets restricted as collateral for payment of the related debt.
	(b)	We periodically enter into term repurchase agreements, short-term borrowing arrangements in which we sell financial instruments to one or more investors while simultaneously committing to repurchase them at a specified future date, at the stated price plus accrued interest. The financial instruments sold under agreement to repurchase typically consist of U.S. government and agency securities.
	(c)	Other relates to secured borrowings at our Commercial Finance Group.
	(d)	Based on the debt outstanding and the interest rate at December 31 of each year.

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2013
Long-term Debt, Unclassified [Abstract]	'
Long-term Debt [Text Block]	'
	Long-term Debt
	The following tables present the composition of our long-term debt portfolio.
	December 31, ($ in millions)	Amount				Interest		Weighted		Due date
						rate		average		range
								interest
								rate (a)
	2013
	Unsecured debt
	Fixed rate (b)	$	21,367
	Variable rate	2,755
	Trust preferred securities	2,624
	Fair value adjustment (c)	445
	Total unsecured debt	27,191				0.32 - 10.29%		6.28	%	2014 - 2049
	Secured debt
	Fixed rate	20,492
	Variable rate	21,782
	Total secured debt (d) (e)	42,274				0.40 - 4.59%		0.98	%	2014 - 2022
	Total long-term debt	$	69,465
	2012
	Unsecured debt
	Fixed rate (b)	$	27,588
	Variable rate	2,345
	Trust preferred securities	2,623
	Fair value adjustment (c)	1,094
	Total unsecured debt	33,650				0.38 - 10.29%		6.72	%	2013 - 2049
	Secured debt
	Fixed rate	20,076
	Variable rate	20,835
	Total secured debt (d) (e)	40,911				0.25 - 8.30%		1.1	%	2013 - 2021
	Total long-term debt	$	74,561
	(a)	Based on the debt outstanding and the interest rate at December 31 of each year.
	(b)	Includes subordinated debt of $271 million at December 31, 2013 and $251 million at December 31, 2012.
	(c)	Amount represents the hedge accounting adjustment of fixed-rate debt.
	(d)	Includes $24.1 billion and $26.5 billion of VIE secured debt outstanding at December 31, 2013 and 2012, respectively.
	(e)	Includes $15.1 billion and $13.5 billion of debt outstanding from the Automotive secured revolving credit facilities at December 31, 2013 and 2012, respectively.
			2013										2012
	December 31, ($ in millions)		Unsecured				Secured			Total			Unsecured			Secured			Total
	Long-term debt
	Due within one year		$	5,321			$	11,851		$	17,172		$	1,070		$	11,503		$	12,573
	Due after one year		21,425				30,423			51,848			31,486			29,408			60,894
	Fair value adjustment		445				—			445			1,094			—			1,094
	Total long-term debt		$	27,191			$	42,274		$	69,465		$	33,650		$	40,911		$	74,561
	The following table presents the scheduled remaining maturity of long-term debt, assuming no early redemptions will occur. The actual payment of secured debt may vary based on the payment activity of the related pledged assets.
	Year ended December 31,		2014				2015			2016			2017			2018			2019 and			Fair value		Total
	($ in millions)																		thereafter			adjustment
	Unsecured
	Long-term debt		$	5,511			$	5,163		$	1,934		$	3,527		$	1,278		$	10,922		$	445	$	28,780
	Original issue discount		(190		)		(59		)	(65		)	(77		)	(90		)	(1,108		)	—		(1,589		)
	Total unsecured		5,321				5,104			1,869			3,450			1,188			9,814			445		27,191
	Secured
	Long-term debt		11,851				13,819			7,861			5,211			2,256			1,276			—		42,274
	Total long-term debt		$	17,172			$	18,923		$	9,730		$	8,661		$	3,444		$	11,090		$	445	$	69,465
	To achieve the desired balance between fixed- and variable-rate debt, we utilize interest rate swap agreements. The use of these derivative financial instruments had the effect of synthetically converting $11.1 billion of our fixed-rate debt into variable-rate obligations and $4.9 billion of our variable-rate debt into fixed-rate obligations at December 31, 2013.
	The following summarizes assets restricted as collateral for the payment of the related debt obligation primarily arising from securitization transactions accounted for as secured borrowings and repurchase agreements.
			2013							2012
	December 31, ($ in millions)		Total				Ally Bank (a)			Total			Ally Bank (a)
	Investment securities		$	2,864			$	2,864		$	1,911		$	1,911
	Mortgage assets held-for-investment and lending receivables		8,524				8,524			9,866			9,866
	Consumer automobile finance receivables		32,947				12,332			29,557			14,833
	Commercial automobile finance receivables		21,249				21,249			19,606			19,606
	Investment in operating leases, net		5,810				3,190			6,058			1,691
	Other assets		563				—			999			272
	Total assets restricted as collateral (b)		$	71,957			$	48,159		$	67,997		$	48,179
Secured debt (c)		$	47,594			$	27,818		$	45,111		$	29,162
(a)	Ally Bank is a component of the total column.
(b)	Ally Bank has an advance agreement with the Federal Home Loan Bank of Pittsburgh (FHLB) and had assets pledged to secure borrowings that were restricted as collateral to the FHLB totaling $12.7 billion and $12.6 billion at December 31, 2013, and 2012, respectively. These assets were composed primarily of consumer and commercial mortgage finance receivables and loans, net. Ally Bank has access to the Federal Reserve Bank Discount Window. Ally Bank had assets pledged and restricted as collateral to the Federal Reserve Bank totaling $3.2 billion and $1.9 billion at December 31, 2013, and 2012, respectively. These assets were composed of consumer mortgage finance receivables and loans, net; consumer automobile finance receivables and loans, net; and investment securities. Availability under these programs is only for the operations of Ally Bank and cannot be used to fund the operations or liabilities of Ally or its subsidiaries.
(c)	Includes $5.3 billion and $4.2 billion of short-term borrowings at December 31, 2013, and 2012, respectively.
Trust Preferred Securities
On December 30, 2009, we entered into a Securities Purchase and Exchange Agreement with U.S. Department of Treasury (Treasury) and GMAC Capital Trust I, a Delaware statutory trust (the Trust), which is a finance subsidiary that is wholly owned by Ally. As part of the agreement, the Trust sold to Treasury 2,540,000 trust preferred securities (TRUPS) issued by the Trust with an aggregate liquidation preference of $2.5 billion. Additionally, we issued and sold to Treasury a ten-year warrant to purchase up to 127,000 additional TRUPS with an aggregate liquidation preference of $127 million, at an initial exercise price of $0.01 per security, which Treasury immediately exercised in full. The Trust, as issuer of the TRUPS, is a variable interest entity which is not consolidated by Ally. Ally has issued junior subordinated notes to the Trust which are reflected as a component of our unsecured debt.
On March 1, 2011, the Declaration of Trust and certain other documents related to the TRUPS were amended and all the outstanding TRUPS held by Treasury were designated 8.125% Fixed Rate / Floating Rate Trust Preferred Securities, Series (Series 2 TRUPS). On March 7, 2011, Treasury sold 100% of the Series 2 TRUPS in an offering registered with the SEC. Ally did not receive any proceeds from the sale.
Each Series 2 TRUPS security has a liquidation amount of $25. Distributions are cumulative and are payable until redemption at the applicable coupon rate. Distributions are payable at an annual rate of 8.125% payable quarterly in arrears, beginning August 15, 2011, to but excluding February 15, 2016. From and including February 15, 2016, to but excluding February 15, 2040, distributions will be payable at an annual rate equal to three-month London interbank offer rate plus 5.785% payable quarterly in arrears, beginning May 15, 2016. Ally has the right to defer payments of interest for a period not exceeding 20 consecutive quarters. The Series 2 TRUPS have no stated maturity date, but must be redeemed upon the redemption or maturity of the related debentures (Debentures), which mature on February 15, 2040. Ally at any time on or after February 15, 2016 may redeem the Series 2 TRUPS at a redemption price equal to 100% of the principal amount being redeemed, plus accrued and unpaid interest through the date of redemption. The Series 2 TRUPS are generally nonvoting, other than with respect to certain limited matters. During any period in which any Series 2 TRUPS remain outstanding but in which distributions on the Series 2 TRUPS have not been fully paid, none of Ally or its subsidiaries will be permitted to (i) declare or pay dividends on, make any distributions with respect to, or redeem, purchase, acquire or otherwise make a liquidation payment with respect to, any of Ally’s capital stock or make any guarantee payment with respect thereto; or (ii) make any payments of principal, interest, or premium on, or repay, repurchase or redeem, any debt securities or guarantees that rank on a parity with or junior in interest to the Debentures with certain specified exceptions in each case.
Covenants and Other Requirements
In secured funding transactions, there are trigger events that could cause the debt to be prepaid at an accelerated rate or could cause our usage of the credit facility to be discontinued. The triggers are generally based on the financial health and performance of the servicer as well as performance criteria for the pool of receivables, such as delinquency ratios, loss ratios, and commercial payment rates. During 2013, there were no trigger events that resulted in the repayment of debt at an accelerated rate or impacted the usage of our credit facilities.
Funding Facilities
We utilize both committed and other credit facilities. The amounts outstanding under our various funding facilities are included on our Consolidated Balance Sheet.
As of December 31, 2013, Ally Bank had exclusive access to $3.0 billion of funding capacity from committed credit facilities. Funding programs supported by the Federal Reserve and the FHLB, together with repurchase agreements, complement Ally Bank’s private committed facilities.
The total capacity in our committed funding facilities is provided by banks and other financial institutions through private transactions. The committed secured funding facilities can be revolving in nature and allow for additional funding during the commitment period, or they can be amortizing and not allow for any further funding after the closing date. At December 31, 2013, $22.4 billion of our $24.7 billion of committed capacity was revolving. Our revolving facilities generally have an original tenor ranging from 364 days to two years. As of December 31, 2013, we had $11.5 billion of committed funding capacity from revolving facilities with a remaining tenor greater than 364 days.
Committed Funding Facilities
		Outstanding							Unused capacity (a)						Total capacity
December 31, ($ in millions)		2013				2012			2013			2012			2013			2012
Bank funding
Secured		$	2,750			$	3,800		$	250		$	4,700		$	3,000		$	8,500
Parent funding
Unsecured (b)		—				118			—			25			—			143
Secured (c) (d) (e)		15,159				22,454			6,497			7,839			21,656			30,293
Total Parent funding		15,159				22,572			6,497			7,864			21,656			30,436
Shared capacity (f)		—				1,154			—			2,971			—			4,125
Total committed facilities		$	17,909			$	27,526		$	6,747		$	15,535		$	24,656		$	43,061
(a)	Funding from committed secured facilities is available on request in the event excess collateral resides in certain facilities or is available to the extent incremental collateral is available and contributed to the facilities.
(b)	Total unsecured parent funding capacity represented committed funding for our discontinued international automobile financing business.
(c)	Total secured parent funding capacity included committed funding for our discontinued international automobile financing business of $12.0 billion at December 31, 2012, with outstanding debt of $9.6 billion.
(d)	Total unused capacity included $2.2 billion at December 31, 2012 from certain committed funding arrangements that were generally reliant upon the origination of future automotive receivables available in 2013.
(e)	Includes the secured facilities of our Commercial Finance Group.
(f)	Funding was generally available for assets originated by Ally Bank or the parent company, Ally Financial Inc. Total shared facilities included committed funding for our discontinued international automobile financing business of $0.1 billion as of December 31, 2012, with outstanding debt of $0.1 billion.

Accrued_Expenses_and_Other_Lia

Accrued Expenses and Other Liabilities	12 Months Ended
	Dec. 31, 2013
Accounts Payable and Accrued Liabilities [Abstract]	'
Accounts Payable and Accrued Liabilities Disclosure [Text Block]	'
	Accrued Expenses and Other Liabilities
	The components of accrued expenses and other liabilities were as follows.
	December 31, ($ in millions)		2013		2012
	Employee compensation and benefits		$	437	$	494
	Accounts payable		414		565
	Fair value of derivative contracts in payable position (a)		317		2,468
	Reserves for insurance losses and loss adjustment expenses		275		341
	Collateral received from counterparties		159		941
	Deferred revenue		122		97
	Accrual related to ResCap Bankruptcy and deconsolidation (b)		—		750
	Other liabilities (c)		673		929
	Total accrued expenses and other liabilities		$	2,397	$	6,585
	(a)	For additional information on derivative instruments and hedging activities, refer to Note 21.
	(b)	Refer to Note 1 for more information regarding the Debtors' bankruptcy.
	(c)	Includes $150 million and $0 accrual for insurance proceeds to be contributed to the ResCap estate at December 31, 2013, and December 31, 2012, respectively. Refer to Note 1 for more information regarding the Debtors' bankruptcy.

Equity

Equity	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Equity Note [Text Block]	'
	Equity
	Common Stock
	Our common stock has a par value of $0.01 and there are 1,547,779 shares authorized for issuance as of December 31, 2013. Our common stock is not registered with the Securities and Exchange Commission, and there is no established public trading market for the shares. Treasury held 63.4% of Ally common stock as of December 31, 2013. The following table presents changes in the number of shares issued and outstanding.
	(in shares)	2013			2012		2011
	Common stock
	January 1,	1,330,970			1,330,970		1,330,970
	New issuances
	Private placement (a)	216,667			—		—
	December 31,	1,547,637			1,330,970		1,330,970
	(a)	On November 20, 2013, Ally completed its private placement of its common stock for an aggregate price of $1.3 billion.
	Preferred Stock
	Series F-2 Mandatorily Convertible Preferred Stock held by U.S. Department of Treasury
	On December 30, 2009, Ally entered into a Securities Purchase and Exchange Agreement (the Purchase Agreement) with Treasury, pursuant to which a series of transactions occurred resulting in Treasury acquiring 228,750,000 shares of Ally's newly issued Fixed Rate Cumulative Mandatorily Convertible Preferred Stock, Series F-2 (the New MCP), with a total liquidation preference of $11.4 billion. On December 30, 2010, Treasury converted 110,000,000 shares of the New MCP into 531,850 shares of Ally common stock. The conversion occurred at an agreed upon rate that exceeded the initial conversion rate as defined in Exhibit H to the Ally Certificate of Incorporation.
	On November 20, 2013, Ally completed its private placement of an aggregate of 216,667 shares of its common stock for an aggregate price of $1.3 billion and its repurchase of all 118,750,000 outstanding shares of the New MCP, held by Treasury, including payment for the elimination or relinquishment of any right to receive additional shares of common stock to be issued pursuant to Section 6(a)(i)(B) of the certificate of designations of the New MCP. Ally paid to Treasury a total of approximately $5.9 billion for the repurchase of the New MCP and Treasury's elimination of its share adjustment right in connection with the New MCP.
	Series A Preferred Stock
	On March 1, 2011, pursuant to a registration rights agreement between Ally and GM, GM notified Ally of its intent to sell shares of Ally's existing Fixed Rate Perpetual Preferred Stock, Series A (Existing Series A Preferred Stock), held by a subsidiary of GM. On March 25, 2011, Ally filed a Certificate of Amendment of Amended and Restated Certificate of Incorporation (the Amendment) with the Secretary of State of the State of Delaware. Pursuant to the Amendment, Ally's Certificate of Incorporation, which included the terms of the Existing Series A Preferred Stock, was amended to modify certain terms of the Existing Series A Preferred Stock. As part of the Amendment, the Existing Series A Preferred Stock was redesignated as Ally's Fixed Rate / Floating Rate Perpetual Preferred Stock, Series A (the Amended Series A Preferred Stock) and the liquidation amount was reduced from $1,000 per share to $25 per share. The Amendment, and a corresponding amendment to Ally's bylaws, also increased the authorized number of shares of Amended Series A Preferred Stock to 160,870,560 shares, which was adjusted to account for the decreased liquidation amount per share. The total number of shares outstanding following the Amendment is 40,870,560 shares.
	Immediately following the Amendment, the subsidiary of GM that held all of the outstanding Amended Series A Preferred Stock sold 100% of the stock in an offering registered with the SEC. Ally did not receive any proceeds from the sale.
	Holders of the Amended Series A Preferred Stock are entitled to receive, when, and if declared by Ally, noncumulative cash dividends. Beginning March 25, 2011, to but excluding May 15, 2016, dividends accrue at a fixed rate of 8.5% per annum. Beginning on May 15, 2016, dividends will accrue at a rate equal to three-month London interbank offer rate (LIBOR) plus 6.243%, commencing on August 15, 2016, in each case on the 15th day of February, May, August, and November. Dividends will be payable to holders of record at the close of business on the preceding February 1, May 1, August 1, or November 1, as the case may be, or on such other date, not more than seventy calendar days prior to the dividend payment date, as will be fixed by the Ally Board of Directors. In the event that dividends with respect to a dividend period have not been paid in full on the dividend payment date, we will be prohibited, subject to certain specified exceptions, from (i) redeeming, purchasing or otherwise acquiring, any stock that ranks on a parity basis with, or junior in interest to, the Amended Series A Preferred Stock; (ii) paying any dividends or making any distributions with respect to any stock that ranks junior in interest to the Amended Series A Preferred Stock, until such time as Ally has paid the dividends payable on shares of the Amended Series A Preferred Stock with respect to a subsequent dividend period; and (iii) declaring or paying any dividend on any stock ranking on a parity basis with the Amended Series A Preferred Stock, subject to certain exceptions.
	The holders of the Amended Series A Preferred Stock do not have voting rights other than those set forth in the certificate of designations for the Amended Series A Preferred Stock included in Ally's Certificate of Incorporation. Ally may not redeem the Amended Series A Preferred Stock before May 15, 2016, and after such time the Amended Series A Preferred Stock may be redeemed in certain circumstances. In the event of any liquidation, dissolution or winding up of the affairs of Ally, holders of the Amended Series A Preferred Stock will be entitled to receive the liquidation amount per share of Amended Series A Preferred Stock and an amount equal to all declared, but unpaid dividends declared prior to the date of payment out of assets available for distribution, before any distribution is made for holders of stock that ranks junior in interest to the Amended Series A Preferred Stock, subject to the rights of Ally's creditors.
	The changes to the terms of the Existing Series A Preferred Stock pursuant to the terms of the Amendment were deemed substantive, and as a result, the transaction was accounted for as a redemption of the Existing Series A Preferred Stock and the issuance of the Amended Series A Preferred Stock. The Existing Series A Preferred Stock was removed at its carrying value, the Amended Series A Preferred Stock was recognized at its fair value, and the difference of $32 million was recorded as an increase to retained earnings, which impacted the income available to common stockholders used for the earnings per common share calculation.
	Series G Preferred Stock
	Effective June 30, 2009, we converted (the Conversion) from a Delaware limited liability company into a Delaware corporation in accordance with applicable law. In connection with the Conversion, the 7% Cumulative Perpetual Preferred Stock (the Blocker Preferred) of Preferred Blocker Inc. (PBI), a wholly owned subsidiary, was required to be converted into or exchanged for preferred stock. For this purpose, we had previously authorized for issuance its 7% Fixed Rate Cumulative Perpetual Preferred Stock, Series G (the Series G Preferred Stock). Pursuant to the terms of a Certificate of Merger, effective October 15, 2009, PBI merged with and into Ally with Ally continuing as the surviving entity. At that time, each share of the Blocker Preferred issued and outstanding immediately prior to the effective time of the merger was converted into the right to receive an equal number of newly issued shares of Series G Preferred Stock. In the aggregate, 2,576,601 shares of Series G Preferred Stock were issued to holders of the Blocker Preferred in connection with the merger. The Series G Preferred Stock ranks equally in right of payment with each of our outstanding series of preferred stock in accordance with the terms thereof.
	The Series G Preferred Stock accrues dividends at a rate of 7% per annum. Dividends are payable quarterly, in arrears, only if and when declared by Ally's Board of Directors. Subject to any other restrictions contained in the terms of any other series of stock or other agreements that Ally is or may become subject to, at Ally's option and subject to Ally having obtained any required regulatory approvals, Ally may, subject to certain conditions, redeem the Series G Preferred Stock, in whole or in part, at any time or from time to time, upon proper notice given, at a redemption price equal to the liquidation amount plus the amount of any accrued and unpaid dividends thereon through the date of redemption. Further, so long as any shares of Series G Preferred Stock remain outstanding, if any shares of Parity Stock (as defined in the certificate of designation for the Series G Preferred Stock) are redeemed, then shares of the Series G Preferred Stock shall also be redeemed on a pro rata basis based on the aggregate liquidation amount of the Series G Preferred Stock and such Parity Stock. The Series G Preferred Stock generally is nonvoting other than class-voting on certain matters under certain circumstances including generally, the authorization of senior capital stock or amendments that adversely impact the Series G Preferred Stock. Ally is generally prohibited from making any Restricted Payments on or prior to January 1, 2014, and may only make Restricted Payments after January 1, 2014, if certain conditions are satisfied. For this purpose, Restricted Payments include, subject to certain exceptions, any dividend payment or distribution of assets on any common stock or any redemption, purchase, or other acquisition of any shares of common stock.
	The following table summarizes information about our Series F-2, Series A, and Series G preferred stock.
	December 31,		2013			2012
	Mandatorily convertible preferred stock held by U.S. Department of Treasury
	Series F-2 preferred stock
	Carrying value ($ in millions)		$	—		$	5,685
	Par value (per share)		0.01			0.01
	Liquidation preference (per share)		50			50
	Number of shares authorized		228,750,000			228,750,000
	Number of shares issued and outstanding		—			118,750,000
	Dividend/coupon		9		%	9		%
	Preferred stock
	Series A preferred stock (a)
	Carrying value ($ in millions)		$	1,021		$	1,021
	Par value (per share)		0.01			0.01
	Liquidation preference (per share)		25			25
	Number of shares authorized		160,870,560			160,870,560
	Number of shares issued and outstanding		40,870,560			40,870,560
	Dividend/coupon
	Prior to May 15, 2016		8.5		%	8.5		%
	On and after May 15, 2016		three month			three month
			LIBOR + 6.243%			LIBOR + 6.243%
	Series G preferred stock (b) (c)
	Carrying value ($ in millions)		$	234		$	234
	Par value (per share)		0.01			0.01
	Liquidation preference (per share)		1,000			1,000
	Number of shares authorized		2,576,601			2,576,601
	Number of shares issued and outstanding		2,576,601			2,576,601
	Dividend/coupon		7		%	7		%
	(a)	Nonredeemable prior to May 15, 2016.
	(b)	Pursuant to a registration rights agreement, we are required to maintain an effective shelf registration statement. In the event we fail to meet this obligation, we may be required to pay additional interest to the holders of the Series G Preferred Stock.
	(c)	Redeemable beginning at December 31, 2011.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Abstract]	'
Comprehensive Income (Loss) Note [Text Block]	'
	Accumulated Other Comprehensive Income (Loss)
	The following table presents changes, net of tax, in each component of accumulated other comprehensive income (loss).
	($ in millions)	Unrealized (losses) gains on investment securities (a)				Translation adjustments and net investment hedges (b)				Cash flow hedges (b)			Defined benefit pension plans			Accumulated other comprehensive income (loss)
	Balance at January 1, 2011	$	(26	)		$	416			$	6		$	(137	)	$	259
	2011 net change	(88		)		(64		)		—			(20		)	(172		)
	Balance at December 31, 2011	(114		)		352				6			(157		)	87
	2012 net change	190				16				(4		)	22			224
	Balance at December 31, 2012	76				368				2			(135		)	311
	2013 net change	(345		)		(303		)		3			58			(587		)
	Balance at December 31, 2013	$	(269	)		$	65			$	5		$	(77	)	$	(276	)
	(a)	Represents the after-tax difference between the fair value and amortized cost of our available-for-sale securities portfolio.
	(b)	For additional information on derivative instruments and hedging activities, refer to Note 21.
	The following table presents the before- and after-tax changes in each component of accumulated other comprehensive income (loss).
	December 31, ($ in millions)	Before Tax				Tax Effect				After Tax
	2013
	Unrealized losses on investment securities
	Net unrealized losses arising during the period	$	(333	)		$	174			$	(159	)
	Less: Net realized gains reclassified to income from continuing operations	180			(a)	(2		)	(b)	178
	Less: Net realized gains reclassified to income from discontinued operations, net of tax	10				(2		)		8
	Net change	(523		)		178				(345		)
	Translation adjustments
	Net unrealized losses arising during the period	(104		)		24				(80		)
	Less: Net realized gains reclassified to income from discontinued operations, net of tax	337				92				429
	Net change	(441		)		(68		)		(509		)
	Net investment hedges (c)
	Net unrealized gains arising during the period	59				(22		)		37
	Less: Net realized losses reclassified to income from discontinued operations, net of tax	(250		)		81				(169		)
	Net change	309				(103		)		206
	Cash flow hedges (c)
	Net unrealized losses arising during the period	(1		)		—				(1		)
	Less: Net realized losses reclassified to income from continuing operations	(7		)	(d)	3			(b)	(4		)
	Net change	6				(3		)		3
	Defined benefit pension plans
	Net unrealized gains arising during the period	26				(8		)		18
	Less: Net losses reclassified to income from continuing operations	(2		)	(e)	—			(b)	(2		)
	Less: Net losses reclassified to income from discontinued operations, net of tax	(49		)		11				(38		)
	Net change	77				(19		)		58
	Other comprehensive loss	$	(572	)		$	(15	)		$	(587	)
	(a)	Includes gains reclassified to other gain on investments, net in our Consolidated Statement of Income.
	(b)	Includes amounts reclassified to income tax (benefit) expense from continuing operations in our Consolidated Statement of Income.
	(c)	For additional information on derivative instruments and hedging activities, refer to Note 21.
	(d)	Includes losses reclassified to interest on long-term debt in our Consolidated Statement of Income.
	(e)	Includes losses reclassified to compensation and benefits expense in our Consolidated Statement of Income.

Earnings_Per_Common_Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share [Text Block]	'
	Earnings per Common Share
	The following table presents the calculation of basic and diluted earnings per common share.
	Year ended December 31, ($ in millions except per share data)		2013			2012			2011
	Net income (loss) from continuing operations		$	416		$	1,370		$	(219	)
	Preferred stock dividends — U.S. Department of Treasury		(543		)	(535		)	(534		)
	Impact of repurchase of mandatorily convertible preferred stock held by U.S. Department of Treasury and elimination of share adjustment right (a)		(240		)	—			—
	Preferred stock dividends		(267		)	(267		)	(260		)
	Impact of preferred stock conversion or amendment		—			—			32
	Net (loss) income from continuing operations attributable to common shareholders (b)		(634		)	568			(981		)
	(Loss) income from discontinued operations, net of tax		(55		)	(174		)	62
	Net (loss) income attributable to common shareholders		$	(689	)	$	394		$	(919	)
	Basic weighted-average common shares outstanding		1,355,375			1,330,970			1,330,970
	Diluted weighted-average common shares outstanding (b)		1,355,375			1,330,970			1,330,970
	Basic earnings per common share
	Net (loss) income from continuing operations		$	(468	)	$	427		$	(738	)
	(Loss) income from discontinued operations, net of tax		(41		)	(131		)	47
	Net (loss) income		$	(509	)	$	296		$	(691	)
	Diluted earnings per common share (b)
	Net (loss) income from continuing operations		$	(468	)	$	427		$	(738	)
	(Loss) income from discontinued operations, net of tax		(41		)	(131		)	47
	Net (loss) income		$	(509	)	$	296		$	(691	)
	(a)	Refer to Note 17 for further detail.
	(b)	Due to the antidilutive effect of converting the Fixed Rate Cumulative Mandatorily Convertible Preferred Stock into common shares and the net loss from continuing operations attributable to common shareholders for 2013, and 2011, respectively, net (loss) income from continuing operations attributable to common shareholders and basic weighted-average common shares outstanding were used to calculate basic and diluted earnings per share.
	The effects of converting the outstanding Fixed Rate Cumulative Mandatorily Convertible Preferred Stock into common shares are not included in the diluted earnings per share calculation for the years ended December 31, 2013, 2012, and 2011, respectively, as the effects would be antidilutive for those periods. As such, 288 thousand, 574 thousand, and 574 thousand of potential common shares were excluded from the diluted earnings per share calculation for the years ended December 31, 2013, 2012, and 2011, respectively.

Regulatory_Capital

Regulatory Capital	12 Months Ended
	Dec. 31, 2013
Regulatory Capital Requirements [Abstract]	'
Regulatory Capital Requirements under Banking Regulations [Text Block]	'
	Regulatory Capital and Other Regulatory Matters
	As a bank holding company, we and our wholly owned state-chartered banking subsidiary, Ally Bank, are subject to risk-based and leverage capital requirements issued by U.S. banking regulators that require us to maintain regulatory capital ratios above minimum levels. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary action by regulators that, if undertaken, could have a direct material effect on the consolidated financial statements or the results of operations and financial condition of Ally and Ally Bank. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, we must meet specific capital guidelines that involve quantitative measures of our assets and certain off-balance sheet items. Our capital amounts and classifications are also subject to qualitative judgments by the regulators about components, risk-weightings, and other factors.
	A risk-based capital ratio is the ratio of a banking organization’s regulatory capital (numerator) to its risk-weighted assets (denominator). Under the existing Basel I capital rules, regulatory capital is divided into two tiers: Tier 1 capital and Tier 2 capital. Tier 1 capital generally consists of common equity, minority interests, qualifying noncumulative preferred stock, and the fixed rate cumulative preferred stock sold to Treasury under the Troubled Asset Relief Program (TARP), less goodwill and other adjustments. Tier 2 capital generally consists of perpetual preferred stock not qualifying as Tier 1 capital, limited amounts of subordinated debt and the allowance for loan losses, and other adjustments. The amount of Tier 2 capital may not exceed the amount of Tier 1 capital. Total regulatory capital is the sum of Tier 1 and Tier 2 capital. Under the existing Basel I capital rules, risk-weighted assets are determined by allocating assets and specified off-balance sheet financial instruments into several broad risk weight categories with higher risk weights (expressed in percentage) assigned to asset classes that present greater perceived risk. Under the existing Basel I capital rules, banking organizations are required to maintain a minimum Total risk-based capital ratio (Total capital to risk-weighted assets) of 8% and a Tier 1 risk-based capital ratio (Tier 1 capital to risk-weighted assets) of 4%.
	The U.S. banking regulators also have established minimum leverage capital ratio requirements. The Tier 1 leverage ratio is defined as Tier 1 capital divided by adjusted quarterly average total assets (which reflect adjustments for disallowed goodwill and certain intangible assets). Under the existing Basel I capital rules, the minimum U.S. Tier 1 leverage ratio is 3% or 4% depending on factors specified in the regulations.
	Under the U.S. banking regulators’ existing regulations, a banking organization meets the regulatory definition of “well-capitalized” when its Total risk-based capital ratio equals or exceeds 10% and its Tier 1 risk-based capital ratio equals or exceeds 6%; and for insured depository institutions, when its Tier 1 leverage ratio equals or exceeds 5%, unless subject to a regulatory directive to maintain higher capital levels. To maintain its status as a financial holding company, Ally and its bank subsidiary, Ally Bank, must remain “well-capitalized” and “well-managed,” as defined under applicable law.
	As discussed below, the U.S. banking regulators have issued the U.S. Basel III final rules to replace the existing Basel I capital rules. Effective January 1, 2015, the “well-capitalized” standard for Ally Bank will be revised to reflect the higher capital requirements in the U.S. Basel III final rules.
	In the context of capital planning and stress testing, the U.S. banking regulators have also developed a measure of capital called “Tier 1 common,” which is defined as Tier 1 capital less noncommon elements, including qualifying perpetual preferred stock, minority interest in subsidiaries, trust preferred securities, and mandatory convertible preferred securities. Tier 1 common is used by banking regulators, investors and analysts to assess and compare the quality and composition of Ally's capital with the capital of other financial services companies. Also, bank holding companies with total consolidated assets of $50 billion or more, such as Ally, must develop and maintain a capital plan annually, and among other elements, the capital plan must include a discussion of how we will maintain a pro forma Tier 1 common risk-based capital ratio (Tier 1 common to risk-weighted assets) above 5% under expected conditions and certain stressed scenarios.
	On October 29, 2010, Ally, IB Finance Holding Company, LLC, Ally Bank, and the FDIC entered into a Capital and Liquidity Maintenance Agreement (CLMA). The effective date of the CLMA was August 24, 2010. The CLMA requires capital at Ally Bank to be maintained at a level such that Ally Bank's leverage ratio is at least 15%. For this purpose, the leverage ratio is determined in accordance with the FDIC's regulations related to capital maintenance.
	The following table summarizes our capital ratios.
		2013				2012				Required			Well-capitalized
	December 31, ($ in millions)	Amount		Ratio		Amount		Ratio		minimum			minimum
	Risk-based capital
	Tier 1 (to risk-weighted assets)
	Ally Financial Inc.	$	15,165	11.79	%	$	20,232	13.13	%	4	%		6	%
	Ally Bank	15,159		16.73		14,136		16.26		4			6
	Total (to risk-weighted assets)
	Ally Financial Inc.	$	16,405	12.76	%	$	21,669	14.07	%	8	%		10	%
	Ally Bank	15,809		17.45		14,827		17.06		8			10
	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		15.3		15		(c)	5	%
	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 =160;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%.
	At December 31, 2013, Ally and Ally Bank were “well-capitalized” and met all capital requirements to which each was subject.
	Basel Capital Accord and Other Regulatory Matters
	In December 2010, the Basel Committee on Banking Supervision (Basel Committee) reached an agreement on the Basel III capital framework, which was designed to increase the quality and quantity of regulatory capital by introducing new risk-based and leverage capital standards. In July 2013, the U.S. banking regulators finalized rules implementing the Basel III capital framework and related Dodd-Frank Act provisions. The U.S. Basel III final rules represent substantial revisions to the existing regulatory capital standards for U.S. banking organizations. Ally will become subject to the U.S. Basel III final rules beginning on January 1, 2015. Certain aspects of the U.S. Basel III final rules, including the new capital buffers and regulatory capital deductions, will be phased in over several years.
	Once fully phased in, the U.S. Basel III final rules will subject Ally to a minimum Common Equity Tier 1 risk-based capital ratio of 4.5%, a minimum Tier 1 risk-based capital ratio of 6%, and a minimum Total risk-based capital ratio of 8% on a fully phased-in basis. Ally will also be subject to a 2.5% Common Equity Tier 1 capital conservation buffer. Failure to maintain such buffers will result in restrictions on Ally’s ability to make capital distributions, including dividend payment, stock repurchases and redemptions, and pay discretionary bonuses to executive officers. In addition to these new risk-based capital standards, the U.S. Basel III final rules require large internationally active U.S. banking organizations (advanced approaches banking organizations) to comply with a minimum Basel III supplementary leverage ratio of 3%. Ally is not an advanced approaches banking organization and therefore will not be subject to the Basel III supplementary leverage ratio requirement. The U.S. Basel III final rules subjects all U.S. banking organizations, including Ally, to a minimum Tier 1 leverage ratio of 4%, the denominator of which only takes into account on-balance sheet assets. Effective January 1, 2015, the “well-capitalized” standard for Ally Bank will be revised to reflect the higher capital requirements in the U.S. Basel III final rules.
	In addition to introducing new capital ratios, the U.S. Basel III final rules revise the eligibility criteria for regulatory capital instruments and provides for the phase-out of existing capital instruments that do not satisfy the new criteria. Subject to certain exceptions (e.g., for certain debt or equity issued to the U.S. government under the Emergency Economic Stabilization Act), trust preferred and other “hybrid” securities will be phased out from a banking organization’s Tier 1 capital by January 1, 2016. Also, certain new items will be deducted from Common Equity Tier 1 capital and certain existing regulatory capital deductions will be modified. Among other things, the final rules require significant investments in the common shares of unconsolidated financial institutions, MSRs, and certain deferred tax assets that exceed specified individual and aggregate thresholds to be deducted from Common Equity Tier 1 capital.
	Beginning on January 1, 2015, the U.S. Basel III final rules will replace the existing Basel I-based approach for calculating risk-weighted assets with the U.S. Basel III standardized approach that, among other things, modifies certain existing risk weights and introduces new methods for calculating risk-weighted assets of certain types of assets and exposures. In December 2013, the Board of Governors of the Federal Reserve System (FRB) made technical revisions to the market risk capital rule, which only applies to banking organizations with significant trading assets and liabilities. Ally is currently not subject to the market risk capital rule.
	Compliance with evolving capital requirements is a strategic priority for Ally. We expect to be in compliance with all applicable requirements within the established timeframes.
	Depository Institutions
	Ally Bank is a state nonmember bank, chartered by the State of Utah, and subject to the supervision of the FDIC and the Utah Department of Financial Institutions. Ally Bank's deposits are insured by the FDIC, and Ally Bank is required to file periodic reports with the FDIC concerning its financial condition. Total assets of Ally Bank were $98.7 billion and $94.8 billion at December 31, 2013 and 2012, respectively. Ally Bank is subject to Utah law (and, in certain instances, federal law) that places restrictions and limitations on the amount of dividends or other distributions. Ally Bank did not make any dividend or other distributions to Ally in 2013, 2012, or 2011.
	The FRB requires banks to maintain minimum average reserve balances. The amount of the required reserve balance for Ally Bank was $416 million and $214 million at December 31, 2013 and 2012, respectively.
	U.S. Mortgage Business
	Our U.S. mortgage business is subject to extensive federal, state, and local laws, rules, and regulations, in addition to judicial and administrative decisions that impose requirements and restrictions on this business. As a Federal Housing Administration-approved lender, Ally Bank is required to submit audited financial statements to the Department of Housing and Urban Development on an annual basis. The U.S. mortgage business is also subject to examination by the Federal Housing Commissioner to assure compliance with Federal Housing Administration regulations, policies, and procedures. The federal, state, and local laws, rules, and regulations to which our U.S. mortgage business is subject, among other things, impose licensing obligations and financial requirements; limit the interest rates, finance charges, and other fees that can be charged; regulate the use of credit reports and the reporting of credit information; impose underwriting requirements; regulate marketing techniques and practices; require the safeguarding of nonpublic information about customers; and regulate servicing practices, including the assessment, collection, foreclosure, claims handling, and investment and interest payments on escrow accounts.
	Ally Bank is required to satisfy regulatory net worth requirements. Failure to meet minimum capital requirements can initiate certain mandatory actions by federal, state, and foreign agencies that could have a material effect on our results of operations and financial condition. Ally Bank was in compliance with these requirements at December 31, 2013.
	Insurance Companies
	Our Insurance operations are subject to certain minimum aggregate capital requirements, net asset and dividend restrictions under applicable state and foreign insurance law, and the rules and regulations promulgated by various U.S. and foreign regulatory agencies. Under various state and foreign insurance regulations, dividend distributions may be made only from statutory unassigned surplus, with approvals required from the regulatory authorities for dividends in excess of certain statutory limitations. At December 31, 2013, the maximum dividend that could be paid by the U.S. insurance subsidiaries over the next twelve months without prior statutory approval was $110 million.

Derivative_Instruments_And_Hed

Derivative Instruments And Hedging Activities	12 Months Ended
	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments and Hedging Activities Disclosure [Text Block]	'
	Derivative Instruments and Hedging Activities
	We enter into interest rate, foreign-currency, and equity swaps, futures, forwards, options, and swaptions in connection with our market risk management activities. Derivative instruments are used to manage interest rate risk relating to specific groups of assets and liabilities, including automotive loan assets and debt. We use foreign exchange contracts to mitigate foreign-currency risk associated with foreign-currency-denominated debt, foreign exchange transactions, and our net investment in foreign subsidiaries. In addition, we also enter into equity option contracts to manage our exposure to the equity markets. Our primary objective for utilizing derivative financial instruments is to manage interest rate risk associated with our fixed and variable rate assets and liabilities, foreign exchange risks related to our foreign-currency denominated assets and liabilities, and market risks related to our investment portfolio.
	Interest Rate Risk
	We monitor our mix of fixed- and variable-rate assets and liabilities. When it is cost-effective to do so, we may enter into interest rate swaps, forwards, futures, options, and swaptions to achieve our desired mix of fixed- and variable-rate assets and liabilities. We execute interest rate swaps, forwards, futures, options, and swaptions to modify our exposure to interest rate risk by converting certain fixed-rate instruments to a variable-rate and certain variable-rate instruments to a fixed-rate. We use a mix of both derivatives that qualify for hedge accounting treatment and economic hedges.
	Derivatives qualifying for hedge accounting consist of receive-fixed swaps designated as fair value hedges of specific fixed-rate debt obligations, pay-fixed swaps designated as fair value hedges of specific portfolios of fixed-rate held-for-investment retail automotive loan assets, and pay-fixed swaps designated as cash flow hedges of the expected future cash flows in the form of interest payments on certain outstanding variable-rate borrowings associated with our secured debt.
	We also execute economic hedges, which consist of interest rate swaps and interest rate caps held to mitigate interest rate risk associated with our debt portfolio. We also use interest rate swaps to hedge our net fixed versus variable interest rate exposure. We enter into economic hedges in the form of short-dated, exchange-traded Eurodollar futures to hedge the interest rate exposure of our fixed-rate automotive loans, as well as forwards, options, and swaptions to economically hedge our net fixed versus variable interest rate exposure.
	In the past, we used a multitude of derivative instruments to manage interest rate risk related to MSRs, mortgage loan commitments, and mortgage loans held-for-sale. They included, but were not limited to, interest rate swaps, forward sales of mortgage backed securities, interest rate futures contracts, options on U.S. Treasuries, swaptions, interest rate floors, and interest rate caps. Since we no longer have exposures to these activities, we no longer utilize these hedge strategies as of December 31, 2013.
	Foreign Exchange Risk
	We enter into derivative financial instrument contracts to mitigate the risk associated with variability in cash flows related to our various foreign-currency exposures.
	We enter into foreign-currency forwards with external counterparties as net investment hedges of foreign exchange exposure on our investments in foreign subsidiaries. However, we have reduced our foreign exchange exposure to net investments in foreign operations through the sales of discontinued international businesses. Refer to Note 2 for further details on these sales.
	Our remaining foreign subsidiaries maintain both assets and liabilities in local currencies. These local currencies are generally the subsidiaries' functional currencies for accounting purposes. Foreign-currency-exchange-rate gains and losses arise when the assets or liabilities of our subsidiaries are denominated in currencies that differ from its functional currency. In addition, our equity is impacted by the cumulative translation adjustments resulting from the translation of foreign subsidiary results; this impact is reflected in our accumulated other comprehensive income (loss).
	We utilize a cross-currency swap to economically hedge foreign exchange exposure on foreign-currency-denominated debt by converting the funding currency to our functional currency. This swap was entered into concurrent with the debt issuance with the terms of the derivative matching the terms of the underlying debt.
	We also enter into foreign currency forwards to economically hedge both our foreign denominated debt and our centralized lending program. The hedge of foreign denominated debt was entered into concurrent with the debt issuance with the terms of the derivative matching the terms of the underlying debt. The centralized lending program manages liquidity for our subsidiary businesses, but as of December 31, 2013, this activity is immaterial. Foreign-currency-denominated loan agreements are executed with our foreign subsidiaries in their local currencies. We evaluate our foreign-currency exposure resulting from intercompany lending and manage our currency risk exposure by entering into foreign-currency derivatives with external counterparties. Our remaining foreign-currency derivatives are recorded at fair value with changes recorded as income offsetting the gains and losses on the associated foreign-currency transactions.
	Market Risk
	We enter into equity options to economically hedge our exposure to the equity markets. We purchase options to assume a long position on certain equities and write options to assume a short position.
	Counterparty Credit Risk
	Derivative financial instruments contain an element of credit risk if counterparties are unable to meet the terms of the agreements. Credit risk associated with derivative financial instruments is measured as the net replacement cost should the counterparties that owe us under the contract completely fail to perform under the terms of those contracts, assuming no recoveries of underlying collateral as measured by the market value of the derivative financial instrument.
	To mitigate the risk of counterparty default, we maintain collateral agreements with certain counterparties. The agreements require both parties to maintain collateral in the event the fair values of the derivative financial instruments meet established thresholds. In the event that either party defaults on the obligation, the secured party may seize the collateral. Generally, our collateral arrangements are bilateral such that we and the counterparty post collateral for the value of our total obligation to each other. Contractual terms provide for standard and customary exchange of collateral based on changes in the market value of the outstanding derivatives. The securing party posts additional collateral when their obligation rises or removes collateral when it falls. We also have unilateral collateral agreements whereby we are the only entity required to post collateral.
	Certain derivative instruments contain provisions that require us to either post additional collateral or immediately settle any outstanding liability balances upon the occurrence of a specified credit risk-related event. If a credit risk-related event had been triggered, the amount of additional collateral required to be posted by us would have been insignificant.
	We placed cash and securities collateral totaling $328 million and $1.3 billion at December 31, 2013 and 2012, respectively, in accounts maintained by counterparties, $18 million of which relates to non-derivative collateral at December 31, 2013 and December 31, 2012. We received cash collateral from counterparties totaling $159 million and $941 million at December 31, 2013 and 2012, respectively. The receivables for collateral placed and the payables for collateral received are included on our Consolidated Balance Sheet in other assets and accrued expenses and other liabilities, respectively. In certain circumstances, we receive or post securities as collateral with counterparties. We do not record such collateral received on our Consolidated Balance Sheet unless certain conditions are met. At December 31, 2013 and 2012, we received noncash collateral of $18 million and $0.3 million, respectively.
	Balance Sheet Presentation
	The following table summarizes the fair value amounts of derivative instruments reported on our Consolidated Balance Sheet. The fair value amounts are presented on a gross basis, are segregated by derivatives that are designated and qualifying as hedging instruments or those that are not, and are further segregated by type of contract within those two categories. At December 31, 2013 and December 31, 2012, $362 million and $2.3 billion, respectively, of the derivative contracts in a receivable position were classified as other assets on the Consolidated Balance Sheet. At December 31, 2013 and December 31, 2012, $317 million and $2.5 billion of derivative contracts in a liability position were classified as accrued expenses and other liabilities on the Consolidated Balance Sheet.
			2013									2012
			Derivative contracts in a						Notional			Derivative contracts in a				Notional
	December 31, ($ in millions)		receivable			payable			amount			receivable position (a)		payable		amount
			position (a)			position (b)								position (b)
	Derivatives qualifying for hedge accounting
	Interest rate contracts
	Swaps (c)		$	204		$	169		$	21,606		$	411	$	10	$	9,828
	Foreign exchange contracts
	Forwards		3			—			326			35		53		8,693
	Total derivatives qualifying for hedge accounting		207			169			21,932			446		63		18,521
	Economic hedges
	Interest rate contracts
	Swaps		36			44			13,613			1,524		2,255		131,337
	Futures and forwards		11			3			29,836			78		46		62,328
	Written options		—			94			11,132			—		70		3,066
	Purchased options		95			—			22,962			244		—		17,967
	Total interest rate risk		142			141			77,543			1,846		2,371		214,698
	Foreign exchange contracts
	Swaps		12			1			1,379			—		2		—
	Forwards		1			1			330			4		23		2,462
	Written options		—			—			17			—		1		1
	Purchased options		—			—			17			1		—		1
	Total foreign exchange risk		13			2			1,743			5		26		2,464
	Equity contracts
	Written options		—			5			3			—		8		435
	Purchased options		—			—			—			1		—		119
	Total equity risk		—			5			3			1		8		554
	Total economic hedges		155			148			79,289			1,852		2,405		217,716
	Total derivatives		$	362		$	317		$	101,221		$	2,298	$	2,468	$	236,237
	(a)	Includes accrued interest of $120 million and $175 million at December 31, 2013 and 2012, respectively.
	(b)	Includes accrued interest of $12 million and $144 million at December 31, 2013 and 2012, respectively.
	(c)	Includes fair value hedges consisting of receive-fixed swaps on fixed-rate debt obligations with $196 million and $411 million in a receivable position, $163 million and $0 in a payable position, and of an $8.5 billion and $7.2 billion notional amount at December 31, 2013 and December 31, 2012, respectively. Other fair value hedges include pay-fixed swaps on portfolios of held-for-investment automotive loan assets with $9 million in a receivable position, $5 million in a payable position, and of a $12.6 billion notional amount at December 31, 2013. There were no outstanding positions at December 31, 2012. Also includes cash flow hedges consisting of pay-fixed swaps on floating rate debt obligations with $1 million and $10 million in a payable position, and of a $495 million and $2.6 billion notional amount at December 31, 2013 and December 31, 2012, respectively.
	Statement of Income and Comprehensive Income Presentation
	The following table summarizes the location and amounts of gains and losses on derivative instruments reported in our Consolidated Statement of Income.
	Year ended December 31, ($ in millions)		2013			2012			2011
	Derivatives qualifying for hedge accounting
	Gain (loss) recognized in earnings on derivatives
	Interest rate contracts
	Interest and fees on finance receivables and loans (a)		$	7		$	—		$	—
	Interest on long-term debt (b)		(389		)	164			895
	Foreign exchange contracts
Other income, net of losses		—			—			35
Gain (loss) recognized in earnings on hedged items (c)
Interest rate contracts
Interest and fees on finance receivables and loans		2			—			—
Interest on long-term debt		402			(193		)	(851		)
Foreign exchange contracts
Other income, net of losses		—			—			(35		)
Total derivatives qualifying for hedge accounting		22			(29		)	44
Economic derivatives
(Loss) gain recognized in earnings on derivatives
Interest rate contracts
Servicing asset valuation and hedge activities, net		(112		)	556			359
Loss on mortgage and automotive loans, net		(37		)	(5		)	(242		)
Other income, net of losses (d)		14			(18		)	(57		)
Total interest rate contracts		(135		)	533			60
Foreign exchange contracts (e)
Interest on long-term debt		94			(39		)	61
Other income, net of losses		24			(48		)	17
Total foreign exchange contracts		118			(87		)	78
Gain recognized in earnings on derivatives		$	5		$	417		$	182
(a)	Amounts exclude losses related to interest for qualifying accounting hedges of portfolios of retail automotive loans held-for-investment of $9 million for the year ended December 31, 2013. These losses are primarily offset by the fixed coupon receipts on the retail automotive loans held-for-investment.
(b)	Amounts exclude gains related to interest for qualifying accounting hedges of debt, which are primarily offset by the fixed coupon payment on the long-term debt. The gains were $131 million, $119 million, and $248 million for the years ended December 31, 2013, 2012, and 2011, respectively.
(c)	Amounts exclude gains related to amortization of deferred basis adjustments on the de-designated hedged item of $247 million, $226 million, and $216 million for the years ended December 31, 2013, 2012, and 2011, respectively.
(d)	Amounts in 2012 and 2011 include other income from derivatives held for trading purposes entered into by our broker-dealer.
(e)	Amounts exclude gains and losses related to the revaluation of the related foreign-denominated debt or receivable. Losses of $117 million, gains of $87 million, and losses of $103 million, were recognized for the years ended December 31, 2013, 2012, and 2011, respectively.
The following table summarizes derivative instruments used in cash flow and net investment hedge accounting relationships.
Year ended December 31, ($ in millions)		2013			2012			2011
Cash flow hedges
Interest rate contracts
(Loss) gain reclassified from accumulated other comprehensive income to interest on long-term debt (a)		$	(7	)	$	1		$	—
(Loss) gain recorded directly to interest on long-term debt		—			(7		)	5
Total interest on long-term debt		$	(7	)	$	(6	)	$	5
Gain (loss) recognized in other comprehensive income		$	6		$	(7	)	$	(1	)
Net investment hedges
Foreign exchange contracts
Loss reclassified from accumulated other comprehensive income to (loss) income from discontinued operations, net		$	(250	)	$	(1	)	$	(8	)
Loss recorded directly to other income, net of losses (b)		—			—			(3		)
Total other income, net of losses		$	(250	)	$	(1	)	$	(11	)
Gain (loss) recognized in other comprehensive income (c)		$	309		$	(270	)	$	173
(a)	The amount in 2013 represents losses reclassified from other comprehensive income into earnings as a result of the discontinuance of hedge accounting because it is probable that the forecasted transaction will not occur.
(b)	The amounts represent the forward points excluded from the assessment of hedge effectiveness.
(c)	The amounts represent the effective portion of net investment hedges. There are offsetting amounts recognized in accumulated other comprehensive income related to the revaluation of the related net investment in foreign operations. There were losses of $582 million, gains of $285 million, and losses of $237 million for the years ended December 31, 2013, 2012, and 2011, respectively.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure [Text Block]	'
	Income Taxes
	The significant components of income tax (benefit) expense from continuing operations were as follows.
	Year ended December 31, ($ in millions)	2013			2012				2011
	Current income tax expense (benefit)
	U.S. federal	$	—		$	—			$	10
	Foreign	4			(24		)		29
	State and local	—			10				8
	Total current expense (benefit)	4			(14		)		47
	Deferred income tax (benefit) expense
	U.S. federal	(67		)	(663		)		—
	Foreign	(1		)	25				(5		)
	State and local	5			(204		)		—
	Total deferred benefit	(63		)	(842		)		(5		)
	Total income tax (benefit) expense from continuing operations	$	(59	)	$	(856	)		$	42
	A reconciliation of income tax (benefit) expense from continuing operations with the amounts at the statutory U.S. federal income tax rate is shown in the following table.
	Year ended December 31, ($ in millions)	2013			2012				2011
	Statutory U.S. federal tax expense (benefit)	$	125		$	180			$	(62	)
	Change in tax resulting from
	Effect of valuation allowance change	(154		)	(1,022		)		49
	Tax credits	(45		)	(45		)		—
	Tax law enactment	(44		)	—				—
	Foreign tax differential	(3		)	9				30
	State and local income taxes, net of federal income tax benefit	16			(34		)		22
	Non-deductible expenses	26			12				9
	Other, net	20			44				(6		)
	Total income tax (benefit) expense from continuing operations	$	(59	)	$	(856	)		$	42
	Our income tax (benefit) expense from continuing operations has not naturally corresponded with our income (loss) from continuing operations before income tax for the years ended December 31, 2013, 2012, and 2011, given we had U.S. and foreign valuation allowance movements during those years. For 2013, consolidated income tax benefit from continuing operations is largely driven by a release of a portion of our valuation allowance related to the measurement of foreign tax credit carryforwards anticipated to be utilized in the future and reversal of our valuation allowance on capital loss carryforwards utilized against current year capital gains. Additional benefit was also recognized from a tax law enactment that retroactively reinstated the active financing exception. For 2012, consolidated income tax benefit from continuing operations was largely driven by a release of a portion of our U.S. valuation allowance on the basis of management's reassessment of the amount of its deferred tax assets that are more likely than not to be realized.
	As of each reporting date, we consider existing evidence, both positive and negative, that could impact our view with regard to future realization of deferred tax assets. We continue to believe it is more likely than not that the benefit for certain capital loss, foreign tax credit, and state net operating loss carryforwards will not be realized. In recognition of this risk, we continue to provide a partial valuation allowance on the deferred tax assets relating to these carryforwards.
	The significant components of deferred tax assets and liabilities are reflected in the following table.
	December 31, ($ in millions)	2013			2012
	Deferred tax assets
	Tax credit carryforwards	$	1,874		$	1,631
	Tax loss carryforwards	1,624			1,025
	Mark-to-market on consumer finance receivables and loans	721			880
	State and local taxes	297			263
	Provision for loan losses	257			306
	Hedging transactions	177			267
	Unearned insurance premiums	140			142
	ResCap settlement accrual	53			262
	Sales of finance receivables and loans	—			206
	Equity investment in ResCap	—			486
	Other	247			266
	Gross deferred tax assets	5,390			5,734
	Valuation allowance	(1,154		)	(1,653		)
	Net deferred tax assets	4,236			4,081
	Deferred tax liabilities
	Lease transactions	1,527			1,756
	Deferred acquisition costs	351			333
	Debt transactions	191			226
	Basis difference in subsidiaries	55			454
	Sales of finance receivables and loans	26			—
	Other	46			128
	Gross deferred tax liabilities	2,196			2,897
	Net deferred tax assets	$	2,040		$	1,184
	The following table summarizes the deferred tax assets and related valuation allowances at December 31, 2013.
	($ in millions)		Deferred Tax Asset			Valuation Allowance				Net Deferred Tax Asset		Years of Expiration
	Tax credit carryforwards
	Foreign tax credits		$	1,753		$	(554	)		$	1,199	2014 - 2023
	General business credits		121			—				121		2032 - 2033
	Total tax credit carryforwards		1,874			(554		)		1,320
	Tax loss carryforwards
	Net operating losses - federal		1,187			—				1,187		2025 - 2033
	Capital losses - federal		437			(437		)		—		2015 - 2017
Total tax loss carryforwards		1,624			(437		)		1,187
State and local taxes
Net operating losses - state		253			(87		)		166		2014 - 2033
Capital losses - state		46			(46		)		—		2014 - 2017
Total state and local taxes		299		(a)	(133		)		166
Other deferred tax assets		1,593			(30		)		1,563		n/a
Total		$	5,390		$	(1,154	)		$	4,236
(a)	State net operating loss and capital loss carryforwards are included in the state and local taxes total disclosed in our deferred inventory table above.
As discussed in Note 1, on May 14, 2012, we deconsolidated ResCap for financial reporting purposes as a result of ResCap's bankruptcy filing. On December 17, 2013, the remainder of ResCap's assets were transferred to a liquidating trust under Chapter 7 of the Bankruptcy Code effectively terminating our ownership in ResCap for U.S. tax purposes. This termination resulted in the write-off of our tax equity investment in ResCap, gain recognition on the relief of nonrecourse debt, and an increase to our tax loss carryforwards. No material change to our total net deferred position resulted from the ResCap liquidation.
As of December 31, 2013, we do not assert that any foreign earnings are indefinitely reinvested outside of the United States. As a result, all deferred tax liabilities for incremental U.S. tax that stem from temporary differences related to investments in foreign subsidiaries or foreign corporate joint ventures have been recognized as of December 31, 2013.
The following table provides a reconciliation of the beginning and ending amount of unrecognized tax benefits.
($ in millions)	2013			2012				2011
Balance at January 1,	$	102		$	198			$	214
Additions based on tax positions related to the current year	174			14				11
Additions for tax positions of prior years	1			2				20
Reductions for tax positions of prior years	—			(4		)		(3		)
Settlements	(14		)	(17		)		(35		)
Expiration of statute of limitations	(1		)	(4		)		—
Foreign-currency translation adjustments	—			(5		)		(9		)
Deconsolidation of ResCap and discontinued operations	—			(82		)		—
Balance at December 31,	$	262		$	102			$	198
Included in the unrecognized tax benefits balances are some items, the recognition of which would not affect the effective tax rate, such as the tax effect of certain temporary differences and the portion of gross state unrecognized tax benefits that would be offset by the tax benefit of the associated federal deduction. At December 31, 2013, 2012, and 2011, the balance of unrecognized tax benefits that, if recognized, would affect our effective tax rate is $240 million, $84 million, and $179 million, respectively.
We recognize accrued interest and penalties related to uncertain income tax positions in interest expense and other operating expenses, respectively. For the years ended December 31, 2013, 2012, and 2011, $2 million, $1 million, and $1 million, respectively, were accrued for interest and penalties with the cumulative accrued balance totaling $7 million at December 31, 2013, $7 million at December 31, 2012, and $178 million at December 31, 2011.
We anticipate the examination of various U.S. income tax returns along with the examinations by various foreign, state, and local jurisdictions will be completed within the next twelve months. As such, it is reasonably possible that certain tax positions may be settled and the unrecognized tax benefits would decrease by $69 million, which includes interest and penalties.
We file tax returns in the U.S. federal jurisdiction and various states and foreign jurisdictions. Our most significant operations remaining following our divestitures of various international operations are the United States and Canada. The oldest tax years that remain subject to examination for those jurisdictions are 2009 and 2008, respectively.

Employee_Benefits_and_Compensa

Employee Benefits and Compensation Plans	12 Months Ended
	Dec. 31, 2013
Compensation Related Costs [Abstract]	'
Compensation and Employee Benefit Plans [Text Block]	'
	Employee Benefit and Compensation Plans
	Defined Contribution Plan
	A significant number of our employees are covered by defined contribution plans. Employer contributions vary based on criteria specific to each individual plan and amounted to $50 million, $49 million, and $49 million in 2013, 2012, and 2011, respectively. These costs were recorded as compensation and benefits expense in our Consolidated Statement of Income. We expect contributions for 2014 to be similar to contributions made in 2013.
	Defined Benefit Pension Plan
	Certain of our employees are eligible to participate in separate retirement plans that provide for pension payments upon retirement based on factors such as length of service and salary. In recent years, we have transferred, frozen, or terminated a significant number of our other defined benefit plans. All income and expense noted for pension accounting was recorded as compensation and benefits expense in our Consolidated Statement of Income.
	The following summarizes information related to our pension plans.
	Year ended December 31, ($ in millions)	2013		2012
	Projected benefit obligation	$	141	$	355
	Fair value of plan assets	142		214
	Over/(under) funded status	$	1	$	(141	)
	The overfunded position is recognized on the Consolidated Balance Sheet and the change in the overfunded position was recorded in other comprehensive income (loss).
	Other Postretirement Benefits
	Certain of our subsidiaries participated in various postretirement medical, dental, vision, and life insurance plans. We have provided for certain amounts associated with estimated future postretirement benefits other than pensions and characterized such amounts as other postretirement benefits. Other postretirement benefits expense (income), which is recorded in compensation and benefits expense in our Consolidated Statement of Income, was minimal in 2013, 2012, and 2011. We expect our other postretirement benefit expense to continue to be minimal in future years.
	Share-based Compensation Plans
	Based on our transactions with Treasury during 2009, we are required to comply with the limitations on executive pay as determined by the Special Master of TARP Compensation (Special Master). We have established Deferred Stock Units (DSUs) and Incentive Restricted Stock Units (IRSUs) as forms of compensation to our senior executives, which have been approved by the Special Master. We also grant Restricted Stock Units (RSUs) to executives under the Long-Term Equity Compensation Incentive Plan (LTIP). Each of our approved compensation plans and awards were designed to provide our executives with an opportunity to share in the future growth in value of Ally, which is necessary to attract and retain key executives.
	Pursuant to the terms of the LTIP, the Ally Board of Directors determines a share price valuation (Share Price Valuation) for share-based compensation awards not less than annually. The Share Price Valuation determined by the Board, assisted by an independent advisor, considered, among other things, the stock price performance, on an indexed basis, of publicly traded common stock issued by certain comparative companies and considered Ally’s common stock as if it were freely tradable in the public markets. The Ally Board of Directors thus determined a Share Price Valuation of $9,000 per share for purposes of the LTIP as of December 31, 2013 and December 2012, respectively.
	RSU awards are incentive awards granted to executives as phantom shares of Ally and are paid in cash. The majority of RSU awards granted in 2008 and 2009 vested ratably on an annual basis based on continued service on December 31, 2012 with the final tranche vesting on December 31, 2012. Participants had the option at grant date to defer the valuation and payout for awards granted in 2008 and 2009. A majority of the RSU awards granted in 2010, 2011, and 2012 vest ratably over a three-year period starting on the date the award was issued, with the majority of the awards fully vesting in February 2013, February 2014, and February 2015, respectively. RSU awards granted in 2013 vest ratably over a two-year period starting on the date the award was issued, with the majority of the awards fully vesting January 2015. The awards require liability treatment and are remeasured quarterly at the Share Price Valuation until they are paid. The compensation costs related to these awards are ratably charged to expense over the applicable service period. Changes in the value related to the portion of the awards that have vested and have not been paid are recognized in earnings in the period in which the changes occur. At December 31, 2013, there were a total of 14,858 RSU award shares outstanding, composed of 57 shares awarded during 2009, 577 shares awarded during 2010, 1,877 shares awarded during 2011, 5,546 shares awarded during 2012, and 6,801 shares awarded during 2013. At December 31, 2012, there were a total of 17,057 RSU award shares outstanding, composed of 189 shares awarded during 2008, 844 shares awarded during 2009, 2,648 shares awarded during 2010, 5,956 shares awarded during 2011, and 7,420 shares awarded during 2012. We recognized compensation expense related to RSU awards of $64 million, $78 million and $50 million for the years ended December 31, 2013, 2012 and 2011, respectively. These costs were recorded as compensation and benefits expense in our Consolidated Statement of Income.
	DSU awards are granted to senior executives as phantom shares of Ally and are included as part of their base salary. DSU awards are generally granted ratably each pay period throughout the year, vest immediately upon grant, and are paid in cash. DSUs awarded in 2013 will generally be redeemable in three equal installments: the first on the final payroll date of 2013, the second ratably over 2014, and the third ratably over 2015. DSUs awarded in 2012 are generally redeemable in three equal annual installments: the first on the final payroll date of 2012, the second ratably over 2013, and the third ratably over 2014. The DSU awards require liability treatment and are remeasured quarterly at the Share Price Valuation until they are paid, with each change in value fully charged to compensation expense in the period in which the change occurs. At December 31, 2013 and 2012 there were a total of 11,980 and 13,190 DSU award shares outstanding, respectively. We recognized compensation expense related to DSU awards of $65 million, $57 million and $19 million for the years ended December 31, 2013, 2012 and 2011, respectively, for the outstanding awards. These costs were recorded as compensation and benefits expense in our Consolidated Statement of Income.
	IRSU awards are incentive awards granted to senior executives as phantom shares of Ally and are paid in cash. IRSU awards from 2009, 2010, and 2011 generally vest in full after two years from the date of grant based on continued service with Ally. There were no IRSUs granted to senior executives in 2012. IRSU awards from 2013 vest two-thirds after two years from grant date and in full three years from grant date. After the vesting requirement is met, IRSU payouts will be made only as we repay our TARP obligations. Payouts will be made in 25% increments based on the percentage of TARP obligations that have been repaid, as determined in accordance with the established guidelines for determining "repayment." As of December 31, 2013, Ally had repaid 75% of its TARP obligations. Payouts are based on the Share Price Valuation of the phantom shares at the time of the payout. The awards require liability treatment and are remeasured quarterly at Share Price Valuation until they are paid. The compensation costs related to these awards are ratably charged to expense over the requisite service period. Changes in value relating to the portion of the awards that have vested and have not been paid are recognized in earnings in the period in which the changes occur. At December 31, 2013 and 2012 there were a total of 2,462 and 6,475 IRSU award shares outstanding, respectively. We recognized compensation expense related to IRSU awards of $8 million, $23 million and $12 million for the years ended December 31, 2013, 2012, and 2011, respectively, for the outstanding awards. These costs were recorded as compensation and benefits expense in our Consolidated Statement of Income.

Fair_Value

Fair Value	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Disclosures [Text Block]	'
	Fair Value
	Fair Value Measurements
	For purposes of this disclosure, fair value is defined as the exchange price that would be received to sell an asset or paid to transfer a liability (exit price) in the principal or most advantageous market in an orderly transaction between market participants at the measurement date. Fair value is based on the assumptions market participants would use when pricing an asset or liability. Additionally, entities are required to consider all aspects of nonperformance risk, including the entity’s own credit standing, when measuring the fair value of a liability.
	GAAP specifies a three-level hierarchy that is used when measuring and disclosing fair value. The fair value hierarchy gives the highest priority to quoted prices available in active markets (i.e., observable inputs) and the lowest priority to data lacking transparency (i.e., unobservable inputs). An instrument’s categorization within the fair value hierarchy is based on the lowest level of significant input to its valuation. The following is a description of the three hierarchy levels.
	Level 1	Inputs are quoted prices in active markets for identical assets or liabilities at the measurement date. Additionally, the entity must have the ability to access the active market, and the quoted prices cannot be adjusted by the entity.
	Level 2	Inputs are other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices in active markets for similar assets or liabilities; quoted prices in inactive markets for identical or similar assets or liabilities; or inputs that are observable or can be corroborated by observable market data by correlation or other means for substantially the full term of the assets or liabilities.
	Level 3	Unobservable inputs are supported by little or no market activity. The unobservable inputs represent management's best assumptions of how market participants would price the assets or liabilities. Generally, Level 3 assets and liabilities are valued using pricing models, discounted cash flow methodologies, or similar techniques that require significant judgment or estimation.
	Transfers	Transfers into or out of any hierarchy level are recognized at the end of the reporting period in which the transfer occurred. For the year ended December 31, 2013, transfers from Level 2 into Level 3 included $93 million of derivative contracts in a receivable position and $93 million of derivative contracts in a payable position based on utilizing independent sources that were not considered market observable related to certain interest rate caps. Transfers from Level 3 into Level 2 included $11 million of derivative contracts in a receivable position based on increased observability of significant inputs related to the valuation of our cross-currency swap. There were no additional transfers between any levels during the year ended December 31, 2013. There were no transfers between any levels during the year ended December 31, 2012.
	Following are descriptions of the valuation methodologies used to measure material assets and liabilities at fair value and details of the valuation models, key inputs to those models, and significant assumptions utilized.
	•	Available-for-sale securities — Available-for-sale securities are carried at fair value based on observable market prices, when available. If observable market prices are not available, our valuations are based on internally developed discounted cash flow models (an income approach) that use a market-based discount rate and consider recent market transactions, experience with similar securities, current business conditions, and analysis of the underlying collateral, as available. To estimate cash flows, we are required to utilize various significant assumptions including market observable inputs (e.g., forward interest rates) and internally developed inputs (including prepayment speeds, delinquency levels, and credit losses).
	•	Mortgage loans held-for-sale, net — Our mortgage loans held-for-sale are accounted for at fair value because of fair value option elections. Mortgage loans held-for-sale are typically pooled together and sold into certain exit markets depending on underlying attributes of the loan, such as GSE eligibility, product type, interest rate, and credit quality. Mortgage loans classified as Level 2 were mainly GSE-eligible mortgage loans carried at fair value due to fair value option election, which are valued predominantly using published forward agency prices. It also includes any domestic loans where recently negotiated market prices for the loan pool exist with a counterparty (which approximates fair value) or quoted market prices for similar loans are available.
	Refer to the section within this note titled Fair Value Option for Financial Assets and Financial Liabilities for further information about the fair value elections.
	•	MSRs — MSRs were classified as Level 3. Management estimated fair value using our transaction data and other market data or, in periods when there were limited MSR market transactions that were directly observable, internally developed discounted cash flow models (an income approach) were used to estimate the fair value. These internal valuation models estimated net cash flows based on internal operating assumptions that we believed 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 believed approximate yields required by investors in this asset. Cash flows primarily included servicing fees, float income, and late fees in each case less operating costs to service the loans. The estimated cash flows were discounted using an option-adjusted spread-derived discount rate. As of June 30, 2013, we no longer held such positions as a result of our exit from the mortgage origination and servicing business.
	•	Interests retained in financial asset sales — The interests retained are in securitization trusts and deferred purchase prices on the sale of whole-loans. Due to inactivity in the market, valuations are based on internally developed discounted cash flow models (an income approach) that use a market-based discount rate; therefore, we classified these assets as Level 3. The valuation considers recent market transactions, experience with similar assets, current business conditions, and analysis of the underlying collateral, as available. To estimate cash flows, we utilize various significant assumptions, including market observable inputs (e.g., forward interest rates) and internally developed inputs (e.g., prepayment speeds, delinquency levels, and credit losses).
	•	Derivative instruments — We enter into a variety of derivative financial instruments as part of our risk management strategies. Certain of these derivatives are exchange traded, such as Eurodollar futures, options of Eurodollar futures, equity options, and centrally-cleared interest rate swaps. To determine the fair value of these instruments, we utilize the quoted market prices for the particular derivative contracts; therefore, we classified these contracts as Level 1.
	We also execute over-the-counter derivative contracts, such as interest rate swaps, a cross-currency swap, swaptions, forwards, caps, floors, and agency to-be-announced securities. We utilize third-party-developed valuation models that are widely accepted in the market to value these over-the-counter derivative contracts. The specific terms of the contract and market observable inputs (such as interest rate forward curves and interpolated volatility assumptions) are used in the model. We classified these over-the-counter derivative contracts as Level 2 because all significant inputs into these models were market observable.
	We also execute over-the-counter interest rate caps in which there are neither quoted market prices, nor do we utilize a third-party valuation model. Therefore, we utilize management's best assumptions of how market participants would price the assets or liabilities and classified these as Level 3.
	Historically, we had interest rate lock commitments and a cross-currency swap accounted for as derivative instruments that were classified as Level 3. We have also historically held certain derivative contracts that are structured specifically to meet a particular hedging objective. These derivative contracts often were utilized to hedge risks inherent within certain on-balance sheet securitizations. To hedge risks on particular bond classes or securitization collateral, the derivative's notional amount was often indexed to the hedged item. As a result, we typically were required to use internally developed prepayment assumptions as an input into the model to forecast future notional amounts on these structured derivative contracts. Accordingly, we classified these derivative contracts as Level 3. However, as of March 31, 2013, we no longer held such positions within continuing operations due to the sales of our international automotive finance businesses.
	We are required to consider all aspects of nonperformance risk, including our own credit standing, when measuring fair value of a liability. We reduce credit risk on the majority of our derivatives by entering into legally enforceable agreements that enable the posting and receiving of collateral associated with the fair value of our derivative positions on an ongoing basis. In the event that we do not enter into legally enforceable agreements that enable the posting and receiving of collateral, we will consider our credit risk and the credit risk of our counterparties in the valuation of derivative instruments through a credit valuation adjustment (CVA), if warranted. The CVA calculation utilizes our credit default swap spreads and the spreads of the counterparty.
	Recurring Fair Value
	The following tables display the assets and liabilities measured at fair value on a recurring basis including financial instruments elected for the fair value option. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The tables below display the hedges separately from the hedged items; therefore, they do not directly display the impact of our risk management activities.
			Recurring fair value measurements
	December 31, 2013 ($ in millions)		Level 1				Level 2				Level 3				Total
	Assets
	Investment securities
	Available-for-sale securities
	Debt securities
	U.S. Treasury and federal agencies		$	310			$	1,117			$	—			$	1,427
	U.S. State and political subdivisions		—				315				—				315
	Foreign government		7				281				—				288
	Mortgage-backed residential		—				10,782				—				10,782
	Mortgage-backed commercial		—				39				—				39
	Asset-backed		—				2,219				—				2,219
	Corporate debt securities		—				1,069				—				1,069
	Total debt securities		317				15,822				—				16,139
	Equity securities (a)		944				—				—				944
	Total available-for-sale securities		1,261				15,822				—				17,083
	Mortgage loans held-for-sale, net (b)		—				16				—				16
	Other assets
	Interests retained in financial asset sales		—				—				100				100
	Derivative contracts in a receivable position (c)
	Interest rate		46				207				93				346
	Foreign currency		—				16				—				16
	Total derivative contracts in a receivable position		46				223				93				362
	Collateral placed with counterparties		—				133				—				133
	Total assets		$	1,307			$	16,194			$	193			$	17,694
	Liabilities
	Accrued expenses and other liabilities
	Derivative contracts in a payable position (c)
	Interest rate		$	(15	)		$	(201	)		$	(94	)		$	(310	)
	Foreign currency		—				(2		)		—				(2		)
	Other		(5		)		—				—				(5		)
	Total derivative contracts in a payable position		(20		)		(203		)		(94		)		(317		)
	Total liabilities		$	(20	)		$	(203	)		$	(94	)		$	(317	)
	(a)	Our investment in any one industry did not exceed 19%.
	(b)	Carried at fair value due to fair value option elections.
	(c)	For additional information on derivative instruments and hedging activities, refer to Note 21.
			Recurring fair value measurements
	December 31, 2012 ($ in millions)		Level 1				Level 2				Level 3				Total
	Assets
	Investment securities
	Available-for-sale securities
	Debt securities
U.S. Treasury and federal agencies		$	697			$	1,517			$	—			$	2,214
Foreign government		3				300				—				303
Mortgage-backed residential		—				6,906				—				6,906
Asset-backed		—				2,340				—				2,340
Corporate debt securities		—				1,263				—				1,263
Total debt securities		700				12,326				—				13,026
Equity securities (a)		1,152				—				—				1,152
Total available-for-sale securities		1,852				12,326				—				14,178
Mortgage loans held-for-sale, net (b)		—				2,490				—				2,490
Mortgage servicing rights		—				—				952				952
Other assets
Interests retained in financial asset sales		—				—				154				154
Derivative contracts in a receivable position (c)
Interest rate		40				2,170				48				2,258
Foreign currency		—				40				—				40
Total derivative contracts in a receivable position		40				2,210				48				2,298
Collateral placed with counterparties (d)		103				99				—				202
Total assets		$	1,995			$	17,125			$	1,154			$	20,274
Liabilities
Accrued expenses and other liabilities
Derivative contracts in a payable position
Interest rate		$	(13	)		$	(2,374	)		$	(1	)		$	(2,388	)
Foreign currency		—				(78		)		(2		)		(80		)
Total derivative contracts in a payable position		(13		)		(2,452		)		(3		)		(2,468		)
Total liabilities		$	(13	)		$	(2,452	)		$	(3	)		$	(2,468	)
(a)	Our investment in any one industry did not exceed 21%.
(b)	Carried at fair value due to fair value option elections.
(c)	For additional information on derivative instruments and hedging activities, refer to Note 21.
(d)	Represents collateral in the form of investment securities. Cash collateral was excluded.
The following table presents quantitative information regarding the significant unobservable inputs used in significant Level 3 assets and liabilities measured at fair value on a recurring basis.
December 31, 2013 ($ in millions)		Level 3 recurring measurements				Valuation technique		Unobservable input		Range
Assets
Other assets
Interests retained in financial asset sales		$	100			Discounted cash flow		Discount rate		5.3-5.5%
								Commercial paper rate		0-0.1%
The following tables present the reconciliation for all Level 3 assets and liabilities measured at fair value on a recurring basis. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The Level 3 items presented below may be hedged by derivatives and other financial instruments that are classified as Level 1 or Level 2. Thus, the following tables do not fully reflect the impact of our risk management activities.
	Level 3 recurring fair value measurements
				Net realized/unrealized																						Fair value at December 31, 2013			Net unrealized gains included in earnings still held at December 31, 2013
				(losses) gains
($ in millions)	Fair value at January 1, 2013			included				included			Purchases			Sales			Issuances			Settlements			Transfers out of level 3
				in  earnings				in OCI
Assets
Mortgage servicing rights	$	952		$	(101	)	(a)	$	—		$	—		$	(911	)	$	60		$	—		$	—		$	—		$	—
Other assets
Interests retained in financial asset sales	154			23			(b)	—			—			—			—			(77		)	—			100			—
Derivative contracts, net (c)
Interest rate	47			(52		)	(d)	—			—			—			—			4			—			(1		)	—
Foreign currency	(2		)	11			(d)	—			—			—			—			2			(11		)	—			11			(d)
Total derivative contracts in a receivable position, net	45			(41		)		—			—			—			—			6			(11		)	(1		)	11
Total assets	$	1,151		$	(119	)		$	—		$	—		$	(911	)	$	60		$	(71	)	$	(11	)	$	99		$	11
(a)	Fair value adjustment was reported as servicing-asset valuation and hedge activities, net, in the Consolidated Statement of Income.
(b)	Reported as other income, net of losses, in the Consolidated Statement of Income.
(c)	For additional information on derivative instruments and hedging activities, refer to Note 21.
(d)	Refer to Note 21 for information related to the location of the gains and losses on derivative instruments in the Consolidated Statement of Income.
	Level 3 recurring fair value measurements
	Fair value			Net realized/unrealized							Purchases			Sales				Issuances			Settlements			Transfers out due to deconsolidation or discontinued operations (a)			Fair value at December 31, 2012			Net
	at			gains (losses)																										unrealized
	1-Jan-12																													gains (losses)
																														included  in
																														earnings still
																														held at
($ in millions)				included				included in OCI																						31-Dec-12
				in
				earnings
Assets
Trading assets (excluding derivatives)
Mortgage-backed residential securities	$	33		$	2		(b)	$	—		$	—		$	—			$	—		$	(4	)	$	(31	)	$	—		$	4		(b)
Investment securities
Available-for-sale debt securities
Asset-backed	62			19				(12		)	—			(69		)		—			—			—			—			—
Mortgage loans held-for-sale, net (c)	30			—				—			12			—				—			(11		)	(31		)	—			—
Consumer mortgage finance receivables and loans, net (c)	835			121			(c)	—			—			(245		)	(d)	—			(124		)	(587		)	—			51			(c)
Mortgage servicing rights	2,519			(677		)	(e)	—			—			—				240			—			(1,130		)	952			(677		)	(e)
Other assets
Interests retained in financial asset sales	231			46			(f)	—			—			—				—			(123		)	—			154			—
Derivative contracts, net (g)
Interest rate	71			(78		)	(h)	—			—			—				—			53			1			47			1			(h)
Foreign currency	16			(32		)	(h)	—			—			—				—			—			14			(2		)	(50		)	(h)
Total derivative contracts in a receivable (payable) position, net	87			(110		)		—			—			—				—			53			15			45			(49		)
Total assets	$	3,797		$	(599	)		$	(12	)	$	12		$	(314	)		$	240		$	(209	)	$	(1,764	)	$	1,151		$	(671	)
Liabilities
Long-term debt
On-balance sheet securitization debt (c)	$	(830	)	$	(115	)	(c)	$	—		$	—		$	—			$	—		$	389		$	556		$	—		$	(62	)	(c)
Accrued expenses and other liabilities
Loan repurchase liabilities (c)	(29		)	—				—			(11		)	—				—			10			30			—			—
Total liabilities	$	(859	)	$	(115	)		$	—		$	(11	)	$	—			$	—		$	399		$	586		$	—		$	(62	)
(a)	Represents the amounts transferred out of Level 3 due to the deconsolidation of ResCap or discontinued operations. Refer to Note 1 for additional information related to ResCap. Refer to Note 2 for additional information related to discontinued operations.
(b)	The fair value adjustment and the related interest were reported as income from discontinued operations, net of tax, in the Consolidated Statement of Income.
(c)	Carried at fair value due to fair value option elections. Refer to the next section of this note titled Fair Value Option for Financial Assets and Liabilities for the location of the gains and losses in the Consolidated Statement of Income.
(d)	Represents the sale of consumer mortgage finance receivables and loans sold as part of the sale of a business line during 2012.
(e)	Fair value adjustment was reported as servicing-asset valuation and hedge activities, net and income from discontinued operations, net of tax, in the Consolidated Statement of Income.
(f)	Reported as other income, net of losses, and income from discontinued operations, net of tax, in the Consolidated Statement of Income.
(g)	Includes derivatives classified as trading. For additional information on derivative instruments and hedging activities, refer to Note 21.
(h)	Refer to Note 21 for information related to the location of the gains and losses on derivative instruments in the Consolidated Statement of Income.
Nonrecurring Fair Value
We may be required to measure certain assets and liabilities at fair value from time to time. These periodic fair value measures typically result from the application of lower-of-cost or fair value accounting or certain impairment measures. These items would constitute nonrecurring fair value measures.
The following tables display the assets and liabilities measured at fair value on a nonrecurring basis.
		Nonrecurring																Lower-of-cost				Total loss
		fair value measurements																or				included in
																		fair value				earnings for
																		or valuation				the year ended
																		reserve
December 31, 2013 ($ in millions)		Level 1				Level 2				Level 3				Total				allowance
Assets
Loans held-for-sale		$	—			$	—			$	18			$	18			$	—			n/m	(a)
Commercial finance receivables and loans, net (b)
Automotive		—				—				54				54				(9		)		n/m	(a)
Other		—				—				59				59				(16		)		n/m	(a)
Total commercial finance receivables and loans, net		—				—				113				113				(25		)		n/m	(a)
Other assets
Repossessed and foreclosed assets (c)		—				—				9				9				(3		)		n/m	(a)
Other		—				—				2				2				—				n/m	(a)
Total assets		$	—			$	—			$	142			$	142			$	(28	)		n/m
n/m =ot meaningful
(a)	We consider the applicable valuation or loan loss allowance to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation or loan loss allowance.
(b)	Represents the portion of the portfolio specifically impaired during 2013. The related valuation allowance represents the cumulative adjustment to fair value of those specific receivables.
(c)	The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value.
		Nonrecurring																Lower-of-cost				Total loss
		fair value measurements																or				included in
																		fair value				earnings for
																		or valuation				the year ended
																		reserve
December 31, 2012 ($ in millions)		Level 1				Level 2				Level 3				Total				allowance
Assets
Commercial finance receivables and loans, net (a)
Automotive		$	—			$	—			$	108			$	108			$	(19	)		n/m	(b)
Other		—				—				23				23				(7		)		n/m	(b)
Total commercial finance receivables and loans, net		—				—				131				131				(26		)		n/m	(b)
Other assets
Repossessed and foreclosed assets (c)		—				—				3				3				(2		)		n/m	(b)
Total assets		$	—			$	—			$	134			$	134			$	(28	)		n/m
n/m =ot meaningful
(a)	Represents the portion of the portfolio specifically impaired during 2012. The related valuation allowance represents the cumulative adjustment to fair value of those specific receivables.
(b)	We consider the applicable valuation or loan loss allowance to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation or loan loss allowance.
(c)	The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value.
The following table presents quantitative information regarding the significant unobservable inputs used in significant Level 3 assets measured at fair value on a nonrecurring basis.
December 31, 2013 ($ in millions)		Level 3 nonrecurring measurements				Valuation technique		Unobservable input		Range
Assets
Commercial finance receivables and loans, net
Automotive		$	54			Fair value of collateral		Adjusted appraisal value		65.0-95.0%
Fair Value Option for Financial Assets
We elected the fair value option for conforming and government-insured mortgage loans held-for-sale. We elected the fair value option to mitigate earnings volatility by better matching the accounting for the assets with the related hedges. Our intent in electing fair value measurement was to mitigate a divergence between accounting losses and economic exposure for certain assets and liabilities.
Excluded from the fair value option were conforming and government-insured loans funded on or prior to July 31, 2009, and repurchased or rerecognized. The loans funded on or prior to July 31, 2009, were ineligible because the election must be made at the time of funding. Repurchased and rerecognized conforming and government-insured loans were not elected because the election would not mitigate earning volatility. We repurchase or rerecognize loans due to representation and warranty obligations or conditional repurchase options. Typically, we will be unable to resell these assets through regular channels due to characteristics of the assets. Since the fair value of these assets is influenced by factors that cannot be hedged, we did not elect the fair value option.
We carried the fair value-elected conforming and government-insured loans as loans held-for-sale, net, on the Consolidated Balance Sheet. Our policy is to separately record interest income on the fair value-elected loans (unless they are placed on nonaccrual status); however, the accrued interest was excluded from the fair value presentation. Upfront fees and costs related to the fair value-elected loans were not deferred or capitalized. The fair value adjustment recorded for these loans was classified as gain (loss) on mortgage loans, net, in the Consolidated Statement of Income. In accordance with GAAP, the fair value option election is irrevocable once the asset is funded even if it is subsequently determined that a particular loan cannot be sold.
The following tables summarize the fair value option elections and information regarding the amounts recorded as earnings for each fair value option-elected item.
		Changes included in the
		Consolidated Statement of Income
Year ended December 31, ($ in millions)		Interest				Loss on				Total
		on loans				mortgage				included in
		held-for-sale (a)				loans, net				earnings
2013
Assets
Mortgage loans held-for-sale, net		$	20			$	(31	)		$	(11	)
2012
Assets
Mortgage loans held-for-sale, net		$	82			$	(32	)		$	50
(a)	Interest income is measured by multiplying the unpaid principal balance on the loans by the coupon rate and the number of days of interest due.
The following table provides the aggregate fair value and the aggregate unpaid principal balance for the fair value option-elected loans.
		2013								2012
December 31, ($ in millions)		Unpaid				Fair				Unpaid				Fair
		principal				value (a)				principal				value (a)
		balance								balance
Assets
Mortgage loans held-for-sale, net
Total loans		$	31			$	16			$	2,416			$	2,490
Nonaccrual loans		18				9				47				25
Loans 90+ days past due (b)		15				8				36				19
(a)	Excludes accrued interest receivable.
(b)	Loans 90+ days past due are also presented within the nonaccrual loan balance and the total loan balance; however, excludes government-insured loans that are still accruing interest.
Fair Value of Financial Instruments
The following table presents the carrying and estimated fair value of financial instruments, except for those recorded at fair value on a recurring basis presented in the previous section of this note titled Recurring Fair Value. When possible, we use quoted market prices to determine fair value. Where quoted market prices are not available, the fair value is internally derived based on appropriate valuation methodologies with respect to the amount and timing of future cash flows and estimated discount rates. However, considerable judgment is required in interpreting market data to develop estimates of fair value, so the estimates are not necessarily indicative of the amounts that could be realized or would be paid in a current market exchange. The effect of using different market assumptions or estimation methodologies could be material to the estimated fair values. Fair value information presented herein was based on information available at December 31, 2013 and 2012.
					Estimated fair value
December 31, ($ in millions)	Carrying				Level 1				Level 2				Level 3				Total
	value
2013
Financial assets
Loans held-for-sale, net (a)	$	35			$	—			$	17			$	18			$	35
Finance receivables and loans, net (a)	99,120				—				—				100,090				100,090
Nonmarketable equity investments	337				—				308				38				346
Financial liabilities
Deposit liabilities	$	53,350			$	—			$	—			$	54,070			$	54,070
Short-term borrowings	8,545				—				—				8,545				8,545
Long-term debt (a)(b)	69,824				—				31,067				42,297				73,364
2012
Financial assets
Loans held-for-sale, net (a)	$	2,576			$	—			$	2,490			$	86			$	2,576
Finance receivables and loans, net (a)	97,885				—				—				98,907				98,907
Nonmarketable equity investments	303				—				272				34				306
Financial liabilities
Deposit liabilities	$	47,915			$	—			$	—			$	48,752			$	48,752
Short-term borrowings	7,461				6				—				7,454				7,460
Long-term debt (a)(b)	74,882				—				36,018				42,533				78,551
(a)	Includes financial instruments carried at fair value due to fair value option elections. Refer to the previous section of this note titled Fair Value Option for Financial Assets and Liabilities for further information about the fair value elections.
(b)	The carrying value includes deferred interest for zero-coupon bonds of $359 million and $321 million at December 31, 2013, and 2012, respectively.
The following describes the methodologies and assumptions used to determine fair value for the significant classes of financial instruments. In addition to the valuation methods discussed below, we also followed guidelines for determining whether a market was not active and a transaction was not distressed. As such, we assumed the price that would be received in an orderly transaction (including a market-based return) and not in forced liquidation or distressed sale.
•	Cash and cash equivalents — Included in cash and cash equivalents are highly liquid investments that are readily convertible to known amounts of cash and which are subject to an insignificant risk of change in value due to interest rate, quoted price, or penalty on withdrawal. Classified as Level 1 under the fair value hierarchy, cash and cash equivalents generally expose us to limited credit risk and have no stated maturities or have short-term maturities and carry interest rates that approximate market. As such, the carrying value approximates the fair value of these instruments.
•	Loans held-for-sale, net — Loans held-for-sale classified as Level 2 included all GSE-eligible mortgage loans valued predominantly using published forward agency prices. It also included any domestic loans where recently negotiated market prices for the loan pool existed with a counterparty (which approximated fair value) or quoted market prices for similar loans were available. Loans held-for-sale classified as Level 3 included all loans valued using internally developed valuation models because observable market prices were not available. The loans were priced on a discounted cash flow basis utilizing cash flow projections from internally developed models that utilized prepayment, default, and discount rate assumptions. To the extent available, we utilized market observable inputs such as interest rates and market spreads. If market observable inputs were not available, we were required to utilize internal inputs, such as prepayment speeds, credit losses, and discount rates.
•	Finance receivables and loans, net — With the exception of mortgage loans held-for-investment, the fair value of finance receivables was based on discounted future cash flows using applicable spreads to approximate current rates applicable to each category of finance receivables (an income approach using Level 3 inputs). The carrying value of commercial receivables in certain markets and certain automotive and other receivables for which interest rates reset on a short-term basis with applicable market indices are assumed to approximate fair value either because of the short-term nature or because of the interest rate adjustment feature. The fair value of commercial receivables in other markets was based on discounted future cash flows using applicable spreads to approximate current rates applicable to similar assets in those markets.
For mortgage loans held-for-investment, we used valuation methods and assumptions similar to those used for mortgage loans held-for-sale. These valuations consider unique attributes of the loans such as geography, delinquency status, product type, and other factors. Refer to the section above titled Loans held-for-sale, net, for a description of methodologies and assumptions used to determine the fair value of mortgage loans held-for-sale.
•	Deposit liabilities — Deposit liabilities represent certain consumer and brokered bank deposits, mortgage escrow deposits, and dealer deposits. The fair value of deposits at Level 3 were estimated by discounting projected cash flows based on discount factors derived from the forward interest rate swap curve.
•	Debt — Level 2 debt was valued using quoted market prices, when available, or other means for substantiation with observable inputs. Debt valued using internally derived inputs, such as prepayment speeds and discount rates, was classified as Level 3.

Offsetting_Assets_and_Liabilit

Offsetting Assets and Liabilities	12 Months Ended
	Dec. 31, 2013
Offsetting [Abstract]	'
Offsetting Assets and Liabilities [Table Text Block]	'
	Offsetting Assets and Liabilities
	Our qualifying derivatives master netting agreements and securities repurchase agreements are written, legally enforceable bilateral agreements that (1) create a single legal obligation for all individual transactions covered by the agreement to the non-defaulting entity upon an event of default of the counterparty, including bankruptcy, insolvency, or similar proceeding, and (2) provide the non-defaulting entity the right to accelerate, terminate, and close-out on a net basis all transactions under the agreement and to liquidate or set off collateral promptly upon an event of default of the counterparty. As it relates to derivative instruments, in certain instances we have the option to report derivatives that are subject to a qualifying master netting agreement on a net basis, we have elected to report these instruments as gross assets and liabilities on the Consolidated Balance Sheet.
	To further mitigate the risk of counterparty default related to derivative instruments, we maintain collateral agreements with certain counterparties. The agreements require both parties to maintain collateral in the event the fair values of the derivative financial instruments meet established thresholds. In the event that either party defaults on the obligation, the secured party may seize the collateral. Generally, our collateral arrangements are bilateral such that we and the counterparty post collateral for the value of our total obligation to each other. Contractual terms provide for standard and customary exchange of collateral based on changes in the market value of the outstanding derivatives. The securing party posts additional collateral when their obligation rises or removes collateral when it falls, such that the net replacement cost of the non-defaulting party is covered in the event of counterparty default.
	The composition of offsetting derivative instruments, financial assets, and financial liabilities was as follows.
			Gross Amounts of Recognized Assets/(Liabilities)			Gross Amounts Offset in the Consolidated Balance Sheet		Net Amounts of Assets/(Liabilities) Presented in the Consolidated Balance Sheet
											Gross Amounts Not Offset in the Consolidated Balance Sheet
	December 31, 2013 ($ in millions)										Financial Instruments			Collateral (a)			Net Amount
	Assets
	Derivative assets in net asset positions		$	319		$	—	$	319		$	(65	)	$	(120	)	$	134
	Derivative assets in net liability positions		43			—		43			(43		)	—			—
	Total assets (b)		$	362		$	—	$	362		$	(108	)	$	(120	)	$	134
	Liabilities
	Derivative liabilities in net liability positions		$	(252	)	$	—	$	(252	)	$	43		$	137		$	(72	)
	Derivative liabilities in net asset positions		(65		)	—		(65		)	65			—			—
	Total derivative liabilities (b)		(317		)	—		(317		)	108			137			(72		)
	Securities sold under agreements to repurchase (c)		(1,500		)	—		(1,500		)	—			1,500			—
	Total liabilities		$	(1,817	)	$	—	$	(1,817	)	$	108		$	1,637		$	(72	)
	(a)	Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty.
	(b)	For additional information on derivative instruments and hedging activities, refer to Note 21.
	(c)	For additional information on securities sold under agreements to repurchase, refer to Note 14.
			Gross Amounts of Recognized Assets/(Liabilities)			Gross Amounts Offset in the Consolidated Balance Sheet		Net Amounts of Assets/(Liabilities) Presented in the Consolidated Balance Sheet
											Gross Amounts Not Offset in the Consolidated Balance Sheet
	December 31, 2012 ($ in millions)										Financial Instruments			Collateral (a)			Net Amount
	Assets
	Derivative assets in net asset positions		$	1,395		$	—	$	1,395		$	(503	)	$	(841	)	$	51
	Derivative assets in net liability positions		788			—		788			(788		)	—			—
	Derivative assets with no offsetting arrangements		115			—		115			—			—			115
	Total assets (b)		$	2,298		$	—	$	2,298		$	(1,291	)	$	(841	)	$	166
	Liabilities
	Derivative liabilities in net liability positions		$	(1,929	)	$	—	$	(1,929	)	$	788		$	1,092		$	(49	)
	Derivative liabilities in net asset positions		(503		)	—		(503		)	503			—			—
	Derivative liabilities with no offsetting arrangements		(36		)	—		(36		)	—			—			(36		)
	Total liabilities (b)		$	(2,468	)	$	—	$	(2,468	)	$	1,291		$	1,092		$	(85	)
	(a)	Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty.
	(b)	For additional information on derivative instruments and hedging activities, refer to Note 21.

Segment_And_Geographic_Informa

Segment And Geographic Information	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Segment Reporting Disclosure [Text Block]	'
	Segment and Geographic Information
	Operating segments are defined as components of an enterprise that engage in business activity from which revenues are earned and expenses incurred for which discrete financial information is available that is evaluated regularly by our chief operating decision maker in deciding how to allocate resources and in assessing performance.
	We report our results of operations on a line-of-business basis through three operating segments - Automotive Finance operations, Insurance operations, and Mortgage operations, with the remaining activity reported in Corporate and Other. The operating segments are determined based on the products and services offered, and reflect the manner in which financial information is currently evaluated by management. The following is a description of each of our reportable operating segments.
	Automotive Finance operations — Provides automotive financing services to consumers and automotive dealers. For consumers, we offer retail automotive financing and leasing for new and used vehicles, and through our commercial automotive financing operations, we fund dealer purchases of new and used vehicles through wholesale or floorplan financing.
	Insurance operations — Offers both consumer financial and insurance products sold primarily through the automotive dealer channel, and commercial insurance products sold to dealers. As part of our focus on offering dealers a broad range of consumer financial and insurance products, we provide vehicle service contracts, maintenance coverage, and GAP products. We also underwrite selected commercial insurance coverages, which primarily insure dealers' vehicle inventory in the United States.
	Mortgage operations — Our ongoing Mortgage operations include the management of our held-for-investment mortgage portfolio.
	Corporate and Other primarily consists of our Commercial Finance Group, our centralized corporate treasury activities, such as management of the cash and corporate investment securities portfolios, short- and long-term debt, retail and brokered deposit liabilities, derivative instruments, the amortization of the discount associated with debt issuances and bond exchanges, and the residual impacts of our corporate funds-transfer pricing (FTP) and treasury asset liability management (ALM) activities. Corporate and Other also includes certain equity investments, overhead that was previously allocated to operations that have since been sold or classified as discontinued operations, and reclassifications and eliminations between the reportable operating segments.
	We utilize an FTP methodology for the majority of our business operations. The FTP methodology assigns charge rates and credit rates to classes of assets and liabilities based on expected duration and the LIBOR swap curve plus an assumed credit spread. Matching duration allocates interest income and interest expense to these reportable segments so their respective results are insulated from interest rate risk. This methodology is consistent with our ALM practices, which includes managing interest rate risk centrally at a corporate level. The net residual impact of the FTP methodology is included within the results of Corporate and Other.
	The information presented in our reportable operating segments and geographic areas tables that follow are based in part on internal allocations, which involve management judgment.
	Financial information for our reportable operating segments is summarized as follows.
	Year ended December 31,		Automotive Finance operations			Insurance			Mortgage operations			Corporate			Consolidated (b)
	($ in millions)					operations						and
												Other (a)
	2013
	Net financing revenue (loss)		$	3,159		$	57		$	76		$	(513	)	$	2,779
	Other revenue		268			1,196			—			20			1,484
	Total net revenue (loss)		3,427			1,253			76			(493		)	4,263
	Provision for loan losses		494			—			13			(6		)	501
	Total noninterest expense		1,662			999			321			423			3,405
	Income (loss) from continuing operations before income tax expense		$	1,271		$	254		$	(258	)	$	(910	)	$	357
	Total assets		$	109,312		$	7,124		$	8,168		$	26,563		$	151,167
	2012
	Net financing revenue (loss)		$	2,827		$	64		$	149		$	(1,149	)	$	1,891
	Other revenue (loss)		322			1,150			1,159			(57		)	2,574
	Total net revenue (loss)		3,149			1,214			1,308			(1,206		)	4,465
	Provision for loan losses		253			—			86			(10		)	329
	Total noninterest expense		1,507			1,054			627			434			3,622
	Income (loss) from continuing operations before income tax expense		$	1,389		$	160		$	595		$	(1,630	)	$	514
	Total assets		$	128,411		$	8,439		$	14,744		$	30,753		$	182,347
	2011
	Net financing revenue (loss)		$	2,530		$	62		$	205		$	(1,673	)	$	1,124
	Other revenue		422			1,336			354			176			2,288
	Total net revenue (loss)		2,952			1,398			559			(1,497		)	3,412
	Provision for loan losses		89			—			123			(51		)	161
	Total noninterest expense		1,530			1,082			344			472			3,428
	Income (loss) from continuing operations before income tax expense		$	1,333		$	316		$	92		$	(1,918	)	$	(177	)
	Total assets		$	112,591		$	8,036		$	33,906		$	29,526		$	184,059
	(a)	Total assets for the Commercial Finance Group were $1.6 billion, $1.5 billion, and $1.2 billion at December 31, 2013, 2012 and 2011, respectively.
	(b)	Net financing revenue after the provision for loan losses totaled $2.3 billion, $1.6 billion, and $1.0 billion for the years ended December 31, 2013, 2012, and 2011, respectively.
	Information concerning principal geographic areas were as follows.
	Year ended December 31, ($ in millions)		Revenue  (a)			Income (loss)			Net income			Identifiable assets (c)			Long-lived assets (d)
						from continuing			(loss) (b)
						operations
						before income
						tax expense (b)
	2013
	Canada		$	171		$	64		$	1,266		$	704		$	—
	Europe (e)		(8		)	(18		)	(88		)	1,972			—
	Latin America		—			7			300			29			—
	Asia-Pacific		1			(2		)	117			520			—
	Total foreign		164			51			1,595			3,225			—
	Total domestic (f)		4,099			306			(1,234		)	147,915			17,916
	Total		$	4,263		$	357		$	361		$	151,140		$	17,916
	2012
	Canada		$	233		$	48		$	295		$	13,362		$	1
	Europe (e)		(28		)	(14		)	183			10,971			16
	Latin America		2			(19		)	219			8,050			33
	Asia-Pacific		4			3			99			395			—
	Total foreign		211			18			796			32,778			50
	Total domestic (f)		4,254			496			400			149,542			13,831
	Total		$	4,465		$	514		$	1,196		$	182,320		$	13,881
	2011
	Canada		$	174		$	(13	)	$	436		$	15,156		$	282
Europe (e)		(42		)	(3		)	175			9,976			92
Latin America		4			(18		)	104			7,647			30
Asia-Pacific		2			—			69			292			—
Total foreign		138			(34		)	784			33,071			404
Total domestic (f)		3,274			(143		)	(941		)	150,470			9,236
Total		$	3,412		$	(177	)	$	(157	)	$	183,541		$	9,640
(a)	Revenue consists of net financing revenue and total other revenue as presented in our Consolidated Statement of Income.
(b)	The domestic amounts include original discount amortization of $262 million, $349 million, and $925 million for the years ended December 31, 2013, 2012, and 2011, respectively.
(c)	Identifiable assets consist of total assets excluding goodwill.
(d)	Long-lived assets consist of investment in operating leases, net, and net property and equipment.
(e)	Amounts include eliminations between our foreign operations.
(f)	Amounts include eliminations between our domestic and foreign operations.

Parent_And_Guarantor_Consolida

Parent And Guarantor Consolidating Financial Statements	12 Months Ended
	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Condensed Financial Statements [Text Block]	'
	Parent and Guarantor Consolidating Financial Statements
	Certain of our senior notes are guaranteed by 100% directly owned subsidiaries of Ally (the Guarantors). As of December 31, 2013, the Guarantors include Ally US LLC and IB Finance Holding Company, LLC (IB Finance), each of which fully and unconditionally guarantee the senior notes on a joint and several basis.
	The following financial statements present condensed consolidating financial data for (i) Ally Financial Inc. (on a parent company-only basis), (ii) the Guarantors, (iii) the nonguarantor subsidiaries (all other subsidiaries), and (iv) an elimination column for adjustments to arrive at (v) the information for the parent company, Guarantors, and nonguarantors on a consolidated basis.
	Investments in subsidiaries are accounted for by the parent company and the Guarantors using the equity-method for this presentation. Results of operations of subsidiaries are therefore classified in the parent company’s and Guarantors’ investment in subsidiaries accounts. The elimination entries set forth in the following condensed consolidating financial statements eliminate distributed and undistributed income of subsidiaries, investments in subsidiaries, and intercompany balances and transactions between the parent, Guarantors, and nonguarantors.
	Condensed Consolidating Statements of Comprehensive Income
	Year ended December 31, 2013 ($ in millions)		Parent				Guarantors				Nonguarantors				Consolidating adjustments				Ally
																			consolidated
	Financing revenue and other interest income
	Interest and fees on finance receivables and loans		$	771			$	—			$	3,758			$	—			$	4,529
	Interest and fees on finance receivables and loans — intercompany		59				—				68				(127		)		—
	Interest on loans held-for-sale		—				—				20				—				20
	Interest and dividends on available-for-sale investment securities		—				—				325				—				325
	Interest-bearing cash		3				—				7				—				10
	Interest-bearing cash — intercompany		—				—				7				(7		)		—
	Operating leases		500				—				2,709				—				3,209
	Total financing revenue and other interest income		1,333				—				6,894				(134		)		8,093
	Interest expense
	Interest on deposits		25				—				629				—				654
	Interest on short-term borrowings		46				—				17				—				63
	Interest on long-term debt		2,039				—				568				(5		)		2,602
	Interest on intercompany debt		66				—				62				(128		)		—
	Total interest expense		2,176				—				1,276				(133		)		3,319
	Depreciation expense on operating lease assets		369				—				1,626				—				1,995
	Net financing (loss) revenue		(1,212		)		—				3,992				(1		)		2,779
	Dividends from subsidiaries
	Nonbank subsidiaries		5,732				3,659				—				(9,391		)		—
	Other revenue
	Servicing fees		152				—				(26		)		—				126
	Servicing asset valuation and hedge activities, net		—				—				(213		)		—				(213		)
	Total servicing income (loss), net		152				—				(239		)		—				(87		)
	Insurance premiums and service revenue earned		—				—				1,012				—				1,012
	Gain on mortgage and automotive loans, net		—				—				55				—				55
	(Loss) gain on extinguishment of debt		(61		)		—				2				—				(59		)
	Other gain on investments, net		—				—				180				—				180
	Other income, net of losses		157				—				1,438				(1,212		)		383
	Total other revenue		248				—				2,448				(1,212		)		1,484
	Total net revenue		4,768				3,659				6,440				(10,604		)		4,263
	Provision for loan losses		196				—				305				—				501
	Noninterest expense
	Compensation and benefits expense		639				—				822				(442		)		1,019
	Insurance losses and loss adjustment expenses		—				—				405				—				405
	Other operating expenses		503				—				2,248				(770		)		1,981
	Total noninterest expense		1,142				—				3,475				(1,212		)		3,405
	Income from continuing operations before income tax (benefit) expense and undistributed income (loss) of subsidiaries		3,430				3,659				2,660				(9,392		)		357
	Income tax (benefit) expense from continuing operations		(967		)		—				908				—				(59		)
	Net income from continuing operations		4,397				3,659				1,752				(9,392		)		416
	(Loss) income from discontinued operations, net of tax		(1,311		)		(19		)		1,274				1				(55		)
	Undistributed income (loss) of subsidiaries
	Bank subsidiary		883				883				—				(1,766		)		—
	Nonbank subsidiaries		(3,608		)		(2,393		)		—				6,001				—
	Net income		361				2,130				3,026				(5,156		)		361
	Other comprehensive loss, net of tax		(587		)		(812		)		(858		)		1,670				(587		)
	Comprehensive (loss) income		$	(226	)		$	1,318			$	2,168			$	(3,486	)		$	(226	)
	Year ended December 31, 2012 ($ in millions)		Parent				Guarantors				Nonguarantors				Consolidating adjustments				Ally
																			consolidated
	Financing revenue and other interest income
	Interest and fees on finance receivables and loans		$	852			$	—			$	3,687			$	—			$	4,539
	Interest and fees on finance receivables and loans — intercompany		104				—				22				(126		)		—
	Interest on loans held-for-sale		15				—				83				—				98
	Interest on trading assets		—				—				10				—				10
	Interest and dividends on available-for-sale investment securities		—				—				292				—				292
	Interest-bearing cash		16				—				8				—				24
	Interest-bearing cash — intercompany		—				—				16				(16		)		—
Operating leases		232				—				2,147				—				2,379
Total financing revenue and other interest income		1,219				—				6,265				(142		)		7,342
Interest expense
Interest on deposits		58				—				587				—				645
Interest on short-term borrowings		60				—				11				—				71
Interest on long-term debt		2,676				—				677				(17		)		3,336
Interest on intercompany debt		(1		)		1				120				(120		)		—
Total interest expense		2,793				1				1,395				(137		)		4,052
Depreciation expense on operating lease assets		113				—				1,286				—				1,399
Net financing (loss) revenue		(1,687		)		(1		)		3,584				(5		)		1,891
Dividends from subsidiaries
Nonbank subsidiaries		1,074				448				—				(1,522		)		—
Other revenue
Servicing fees		191				—				218				—				409
Servicing asset valuation and hedge activities, net		—				—				(4		)		—				(4		)
Total servicing income, net		191				—				214				—				405
Insurance premiums and service revenue earned		—				—				1,055				—				1,055
(Loss) gain on mortgage and automotive loans, net		(2		)		—				381				—				379
Loss on extinguishment of debt		—				—				(148		)		—				(148		)
Other gain on investments, net		—				—				146				—				146
Other income, net of losses		173				474				1,280				(1,190		)		737
Total other revenue		362				474				2,928				(1,190		)		2,574
Total net (loss) revenue		(251		)		921				6,512				(2,717		)		4,465
Provision for loan losses		81				—				248				—				329
Noninterest expense
Compensation and benefits expense		728				473				381				(476		)		1,106
Insurance losses and loss adjustment expenses		—				—				454				—				454
Other operating expenses		1,090				1				1,685				(714		)		2,062
Total noninterest expense		1,818				474				2,520				(1,190		)		3,622
(Loss) income from continuing operations before income tax benefit and undistributed income (loss) of subsidiaries		(2,150		)		447				3,744				(1,527		)		514
Income tax benefit from continuing operations		(172		)		—				(684		)		—				(856		)
Net (loss) income from continuing operations		(1,978		)		447				4,428				(1,527		)		1,370
Income (loss) from discontinued operations, net of tax		49				(93		)		(130		)		—				(174		)
Undistributed income (loss) of subsidiaries
Bank subsidiary		859				859				—				(1,718		)		—
Nonbank subsidiaries		2,266				(105		)		—				(2,161		)		—
Net income		1,196				1,108				4,298				(5,406		)		1,196
Other comprehensive income, net of tax		224				149				411				(560		)		224
Comprehensive income		$	1,420			$	1,257			$	4,709			$	(5,966	)		$	1,420
Year ended December 31, 2011 ($ in millions)		Parent				Guarantors				Nonguarantors				Consolidating adjustments				Ally
																		consolidated
Financing revenue and other interest income
Interest and fees on finance receivables and loans		$	1,071			$	—			$	3,128			$	(10	)		$	4,189
Interest and fees on finance receivables and loans — intercompany		173				—				26				(199		)		—
Interest on loans held-for-sale		5				—				175				—				180
Interest on trading assets		—				—				8				—				8
Interest and dividends on available-for-sale investment securities		4				—				346				—				350
Interest-bearing cash		5				—				10				—				15
Operating leases		713				—				1,216				—				1,929
Total financing revenue and other interest income		1,971				—				4,909				(209		)		6,671
Interest expense
Interest on deposits		65				—				550				—				615
Interest on short-term borrowings		56				—				5				—				61
Interest on long-term debt		3,365				(1		)		587				(21		)		3,930
Interest on intercompany debt		(13		)		2				196				(185		)		—
Total interest expense		3,473				1				1,338				(206		)		4,606
Depreciation expense on operating lease assets		250				—				691				—				941
Net financing (loss) revenue		(1,752		)		(1		)		2,880				(3		)		1,124
Dividends from subsidiaries
Nonbank subsidiaries		1,383				—				—				(1,383		)		—
Other revenue
Servicing fees		270				—				256				(1		)		525
Servicing asset valuation and hedge activities, net		—				—				(434		)		—				(434		)
Total servicing income (loss), net		270				—				(178		)		(1		)		91
Insurance premiums and service revenue earned		—				—				1,153				—				1,153
Gain on mortgage and automotive loans, net		22				—				207				—				229
Loss on extinguishment of debt		(64		)		—				—				—				(64		)
Other gain on investments, net		10				—				248				—				258
Other income, net of losses		(167		)		37				1,415				(664		)		621
Total other revenue		71				37				2,845				(665		)		2,288
Total net (loss) revenue		(298		)		36				5,725				(2,051		)		3,412
Provision for loan losses		58				—				103				—				161
Noninterest expense
Compensation and benefits expense		685				37				308				(37		)		993
Insurance losses and loss adjustment expenses		—				—				452				—				452
Other operating expenses		541				1				2,069				(628		)		1,983
Total noninterest expense		1,226				38				2,829				(665		)		3,428
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income (loss) of subsidiaries		(1,582		)		(2		)		2,793				(1,386		)		(177		)
Income tax (benefit) expense from continuing operations		(616		)		(1		)		659				—				42
Net (loss) income from continuing operations		(966		)		(1		)		2,134				(1,386		)		(219		)
Income (loss) from discontinued operations, net of tax		10				(8		)		57				3				62
Undistributed income (loss) of subsidiaries
Bank subsidiary		1,254				1,254				—				(2,508		)		—
Nonbank subsidiaries		(455		)		477				—				(22		)		—
Net (loss) income		(157		)		1,722				2,191				(3,913		)		(157		)
Other comprehensive loss, net of tax		(172		)		(63		)		(346		)		409				(172		)
Comprehensive (loss) income		$	(329	)		$	1,659			$	1,845			$	(3,504	)		$	(329	)
Condensed Consolidating Balance Sheet
December 31, 2013 ($ in millions)		Parent (a)				Guarantors				Nonguarantors (a)				Consolidating				Ally
														adjustments				consolidated
Assets
Cash and cash equivalents
Noninterest-bearing		$	979			$	37			$	299			$	—			$	1,315
Interest-bearing		1,951				—				2,265				—				4,216
Interest-bearing — intercompany		—				—				410				(410		)		—
Total cash and cash equivalents		2,930				37				2,974				(410		)		5,531
Investment securities		—				—				17,083				—				17,083
Loans held-for-sale, net		—				—				35				—				35
Finance receivables and loans, net
Finance receivables and loans, net		6,673				—				93,655				—				100,328
Intercompany loans to
Bank subsidiary		600				—				—				(600		)		—
Nonbank subsidiaries		4,207				—				1,925				(6,132		)		—
Allowance for loan losses		(131		)		—				(1,077		)		—				(1,208		)
Total finance receivables and loans, net		11,349				—				94,503				(6,732		)		99,120
Investment in operating leases, net		3,172				—				14,508				—				17,680
Intercompany receivables from
Bank subsidiary		236				—				—				(236		)		—
Nonbank subsidiaries		465				—				588				(1,053		)		—
Investment in subsidiaries
Bank subsidiary		14,916				14,916				—				(29,832		)		—
Nonbank subsidiaries		12,201				68				—				(12,269		)		—
Premiums receivable and other insurance assets		—				—				1,634				(21		)		1,613
Other assets		3,122				—				6,880				(413		)		9,589
Assets of operations held-for-sale		516				—				—				—				516
Total assets		$	48,907			$	15,021			$	138,205			$	(50,966	)		$	151,167
Liabilities
Deposit liabilities
Noninterest-bearing		$	—			$	—			$	60			$	—			$	60
Interest-bearing		440				—				52,850				—				53,290
Total deposit liabilities		440				—				52,910				—				53,350
Short-term borrowings		3,225				—				5,320				—				8,545
Long-term debt		25,819				—				43,646				—				69,465
Intercompany debt to
Nonbank subsidiaries		2,334				—				4,808				(7,142		)		—
Intercompany payables to
Bank subsidiary		197				—				—				(197		)		—
Nonbank subsidiaries		666				—				447				(1,113		)		—
Interest payable		709				—				179				—				888
Unearned insurance premiums and service revenue		—				—				2,314				—				2,314
Accrued expenses and other liabilities		1,309				93				1,408				(413		)		2,397
Total liabilities		34,699				93				111,032				(8,865		)		136,959
Total equity		14,208				14,928				27,173				(42,101		)		14,208
Total liabilities and equity		$	48,907			$	15,021			$	138,205			$	(50,966	)		$	151,167
(a)	Amounts presented are based upon the legal transfer of the underlying assets to VIEs in order to reflect legal ownership.
December 31, 2012 ($ in millions)		Parent (a)				Guarantors				Nonguarantors (a)				Consolidating				Ally
														adjustments				consolidated
Assets
Cash and cash equivalents
Noninterest-bearing		$	729			$	—			$	344			$	—			$	1,073
Noninterest-bearing — intercompany		39				—				—				(39		)		—
Interest-bearing		3,204				—				3,236				—				6,440
Interest-bearing — intercompany		—				—				452				(452		)		—
Total cash and cash equivalents		3,972				—				4,032				(491		)		7,513
Investment securities		—				—				14,178				—				14,178
Loans held-for-sale, net		—				—				2,576				—				2,576
Finance receivables and loans, net
Finance receivables and loans, net		12,486				—				86,569				—				99,055
Intercompany loans to
Bank subsidiary		1,600				—				—				(1,600		)		—
Nonbank subsidiaries		3,514				—				672				(4,186		)		—
Allowance for loan losses		(170		)		—				(1,000		)		—				(1,170		)
Total finance receivables and loans, net		17,430				—				86,241				(5,786		)		97,885
Investment in operating leases, net		2,003				—				11,547				—				13,550
Intercompany receivables from
Bank subsidiary		677				—				—				(677		)		—
Nonbank subsidiaries		315				334				378				(1,027		)		—
Investment in subsidiaries
Bank subsidiary		14,288				14,288				—				(28,576		)		—
Nonbank subsidiaries		19,180				3,723				—				(22,903		)		—
Mortgage servicing rights		—				—				952				—				952
Premiums receivable and other insurance assets		—				—				1,609				—				1,609
Other assets		2,514				—				9,968				(574		)		11,908
Assets of operations held-for-sale		855				762				30,582				(23		)		32,176
Total assets		$	61,234			$	19,107			$	162,063			$	(60,057	)		$	182,347
Liabilities
Deposit liabilities
Noninterest-bearing		$	—			$	—			$	1,977			$	—			$	1,977
Noninterest-bearing — intercompany		—				—				39				(39		)		—
Interest-bearing		983				—				44,955				—				45,938
Total deposit liabilities		983				—				46,971				(39		)		47,915
Short-term borrowings		3,094				—				4,367				—				7,461
Long-term debt		32,342				—				42,219				—				74,561
Intercompany debt to
Nonbank subsidiaries		530				—				5,708				(6,238		)		—
Intercompany payables to
Bank subsidiary		752				—				—				(752		)		—
Nonbank subsidiaries		674				—				278				(952		)		—
Interest payable		748				—				184				—				932
Unearned insurance premiums and service revenue		—				—				2,296				—				2,296
Accrued expenses and other liabilities		2,187				451				4,517				(570		)		6,585
Liabilities of operations held-for-sale		26				725				21,948				—				22,699
Total liabilities		41,336				1,176				128,488				(8,551		)		162,449
Total equity		19,898				17,931				33,575				(51,506		)		19,898
Total liabilities and equity		$	61,234			$	19,107			$	162,063			$	(60,057	)		$	182,347
(a)	Amounts presented are based upon the legal transfer of the underlying assets to VIEs in order to reflect legal ownership.
Condensed Consolidating Statement of Cash Flows
Year ended December 31, 2013 ($ in millions)		Parent				Guarantors				Nonguarantors				Consolidating				Ally
														adjustments				consolidated
Operating activities
Net cash provided by operating activities		$	3,015			$	3,572			$	5,305			$	(9,391	)		$	2,501
Investing activities
Purchases of available-for-sale securities		—				—				(12,304		)		—				(12,304		)
Proceeds from sales of available-for-sale securities		—				—				3,627				—				3,627
Proceeds from maturities and repayments of available-for-sale securities		—				—				5,509				—				5,509
Net decrease (increase) in finance receivables and loans		4,898				79				(7,456		)		—				(2,479		)
Net change in loans — intercompany		306				251				(1,503		)		946				—
Net increase in operating lease assets		(1,320		)		—				(4,912		)		—				(6,232		)
Capital contributions to subsidiaries		(477		)		—				—				477				—
Returns of contributed capital		1,002				150				—				(1,152		)		—
Sales of mortgage servicing rights		—				—				911				—				911
Proceeds from sale of business units, net		1,799				554				5,091				—				7,444
Net change in restricted cash		—				(26		)		(44		)		—				(70		)
Other, net		41				—				10				—				51
Net cash provided by (used in) investing activities		6,249				1,008				(11,071		)		271				(3,543		)
Financing activities
Net change in short-term borrowings — third party		131				36				1,424				—				1,591
Net (decrease) increase in deposits		(543		)		—				5,879				39				5,375
Proceeds from issuance of long-term debt — third party		3,236				—				24,076				—				27,312
Repayments of long-term debt — third party		(9,468		)		(70		)		(22,354		)		—				(31,892		)
Net change in debt — intercompany		1,803				(271		)		(629		)		(903		)		—
Proceeds from issuance of common stock		1,270				—				—				—				1,270
Repurchase of mandatorily convertible preferred stock held by U.S. Department of Treasury and elimination of share adjustment right		(5,925		)		—				—				—				(5,925		)
Dividends paid — third party		(810		)		—				—				—				(810		)
Dividends paid and returns of contributed capital — intercompany		—				(4,267		)		(6,275		)		10,542				—
Capital contributions from parent		—				29				448				(477		)		—
Net cash (used in) provided by financing activities		(10,306		)		(4,543		)		2,569				9,201				(3,079		)
Effect of exchange-rate changes on cash and cash equivalents		—				—				45				—				45
Net (decrease) increase in cash and cash equivalents		(1,042		)		37				(3,152		)		81				(4,076		)
Adjustment for change in cash and cash equivalents of operations held-for-sale		—				—				2,094				—				2,094
Cash and cash equivalents at beginning of year		3,972				—				4,032				(491		)		7,513
Cash and cash equivalents at end of year		$	2,930			$	37			$	2,974			$	(410	)		$	5,531
Year ended December 31, 2012 ($ in millions)		Parent				Guarantors				Nonguarantors				Consolidating				Ally
														adjustments				consolidated
Operating activities
Net cash provided by operating activities		$	102			$	306			$	5,862			$	(1,221	)		$	5,049
Investing activities
Purchases of available-for-sale securities		—				—				(12,816		)		—				(12,816		)
Proceeds from sales of available-for-sale securities		—				—				7,662				—				7,662
Proceeds from maturities and repayments of available-for-sale securities		—				—				5,673				—				5,673
Net decrease (increase) in finance receivables and loans		3,027				2				(14,972		)		—				(11,943		)
Proceeds from sales of finance receivables and loans		352				—				1,980				—				2,332
Net change in loans — intercompany		3,879				105				129				(4,113		)		—
Net increase in operating lease assets		(2,268		)		—				(3,431		)		—				(5,699		)
Capital contributions to subsidiaries		(261		)		—				—				261				—
Returns of contributed capital		2,079				—				—				(2,079		)		—
Net cash effect from deconsolidation of ResCap		—				—				(539		)		—				(539		)
Proceeds from sale of business units, net		29				—				487				—				516
Net change in restricted cash		—				(13		)		(1,685		)		—				(1,698		)
Other, net		(247		)		—				204				—				(43		)
Net cash provided by (used in) investing activities		6,590				94				(17,308		)		(5,931		)		(16,555		)
Financing activities
Net change in short-term borrowings — third party		338				25				2,331				—				2,694
Net (decrease) increase in deposits		(785		)		1				7,476				(39		)		6,653
Proceeds from issuance of long-term debt — third party		3,613				70				35,718				—				39,401
Repayments of long-term debt — third party		(11,238		)		(73		)		(28,598		)		—				(39,909		)
Net change in debt — intercompany		(44		)		(149		)		(3,984		)		4,177				—
Dividends paid — third party		(802		)		—				—				—				(802		)
Dividends paid and returns of contributed capital — intercompany		—				(457		)		(2,843		)		3,300				—
Capital contributions from parent		—				169				92				(261		)		—
Net cash (used in) provided by financing activities		(8,918		)		(414		)		10,192				7,177				8,037
Effect of exchange-rate changes on cash and cash equivalents		(63		)		—				5				—				(58		)
Net decrease in cash and cash equivalents		(2,289		)		(14		)		(1,249		)		25				(3,527		)
Adjustment for change in cash and cash equivalents of operations held-for-sale		—				—				(1,995		)		—				(1,995		)
Cash and cash equivalents at beginning of year		6,261				14				7,276				(516		)		13,035
Cash and cash equivalents at end of year		$	3,972			$	—			$	4,032			$	(491	)		$	7,513
Year ended December 31, 2011 ($ in millions)	Parent				Guarantors				Nonguarantors				Consolidating				Ally
													adjustments				consolidated
Operating activities
Net cash provided by operating activities	$	2,695			$	209			$	3,973			$	(1,384	)		$	5,493
Investing activities
Purchases of available-for-sale securities	—				—				(19,377		)		—				(19,377		)
Proceeds from sales of available-for-sale securities	1,494				—				12,738				—				14,232
Proceeds from maturities and repayments of available-for-sale securities	1				—				4,964				—				4,965
Net increase in finance receivables and loans	(2,933		)		(51		)		(14,014		)		—				(16,998		)
Proceeds from sales of finance receivables and loans	1,346				—				1,522				—				2,868
Net change in loans — intercompany	2,743				11				(88		)		(2,666		)		—
Net (increase) decrease in operating lease assets	2,890				—				(3,901		)		—				(1,011		)
Capital contributions to subsidiaries	(1,634		)		(855		)		—				2,489				—
Returns of contributed capital	1,255				—				—				(1,255		)		—
Proceeds from sale of business unit, net	—				—				50				—				50
Net change in restricted cash	157				—				189				—				346
Other, net	(33		)		(1		)		831				—				797
Net cash provided by (used in) investing activities	5,286				(896		)		(17,086		)		(1,432		)		(14,128		)
Financing activities
Net change in short-term borrowings — third party	237				47				230				—				514
Net increase in deposits	308				—				5,766				—				6,074
Proceeds from issuance of long-term debt — third party	3,201				200				41,353				—				44,754
Repayments of long-term debt — third party	(9,414		)		(226		)		(30,833		)		—				(40,473		)
Net change in debt — intercompany	71				30				(2,755		)		2,654				—
Dividends paid — third party	(819		)		—				—				—				(819		)
Dividends paid and returns of contributed capital — intercompany	—				(207		)		(2,431		)		2,638				—
Capital contributions from parent	—				855				1,634				(2,489		)		—
Net cash (used in) provided by financing activities	(6,416		)		699				12,964				2,803				10,050
Effect of exchange-rate changes on cash and cash equivalents	31				—				18				—				49
Net increase (decrease) in cash and cash equivalents	1,596				12				(131		)		(13		)		1,464
Adjustment for change in cash and cash equivalents of operations held-for-sale	—				—				(99		)		—				(99		)
Cash and cash equivalents at beginning of year	4,665				2				7,506				(503		)		11,670
Cash and cash equivalents at end of year	$	6,261			$	14			$	7,276			$	(516	)		$	13,035

Guarantees_and_Commitments

Guarantees and Commitments	12 Months Ended
	Dec. 31, 2013
Guarantees [Abstract]	'
Guarantees [Text Block]	'
	Guarantees and Commitments
	Guarantees
	Guarantees are defined as contracts or indemnification agreements that contingently require us to make payments to third parties based on changes in the underlying agreements with the guaranteed parties. The following summarizes our outstanding guarantees, including those of our discontinued operations, made to third parties on our Consolidated Balance Sheet, for the periods shown.
		2013				2012
	December 31, ($ in millions)	Maximum		Carrying value		Maximum		Carrying value
		liability		of liability		liability		of liability
	Default automotive repurchases	$	—	$	—	$	1,897	$	—
	Standby letters of credit and other guarantees	142		30		274		44
	Default Automotive Repurchases
	Certain of our discontinued international automotive financing businesses provided certain investors in our on-balance sheet arrangements (securitizations) and whole-loan transactions with repurchase commitments for loans that became contractually delinquent within a specified time from their date of origination or purchase. The maximum obligation represented the principal balance for loans sold that were covered by those stipulations. Refer to Note 9 for further information regarding our securitization trusts.
	Standby Letters of Credit
	Our Commercial Finance Group has exposure to standby letters of credit that represent irrevocable guarantees of payment of specified financial obligations. Third-party beneficiaries primarily utilize standby letters of credit as insurance in the event of nonperformance by our customers. Assets of the customers (e.g., trade receivables, inventory, and cash deposits) generally collateralize the letters of credit. Expiration dates on letters of credit range from certain ongoing commitments that will expire during the upcoming year to terms of several years for certain letters of credit.
	If nonperformance by a customer occurs for letters of credit, we can be liable for payment of the letter of credit to the beneficiary with our likely recourse being a charge back to the customer or liquidation of the collateral.
	Commitments
	Financing Commitments
	The contractual commitments were as follows.
	December 31, ($ in millions)	2013		2012
	Commitments to
	Sell mortgages or securities (a)	$	—	$	6,282
	Originate/purchase mortgages or securities (a)	—		4,249
	Provide capital to investees (b)	63		86
	Provide retail automotive receivables to third-parties (c)	—		425
	Construction-lending commitments (d)	187		100
	Home equity lines of credit (e)	388		411
	Unused revolving credit line commitments (f)	1,062		668
	(a)	We have exited the mortgage origination and servicing business.
	(b)	We are committed to contribute capital to certain investees. The fair value of these commitments is considered in the overall valuation of the underlying assets with which they are associated.
	(c)	Certain of our discontinued international automotive financing businesses were committed to provide retail automotive receivables to third-party banks in exchange for secured debt. Those transactions did not meet the definition of a sale.
	(d)	The fair value of these commitments is considered in the overall valuation of the related assets.
	(e)	We are committed to fund the remaining unused balances on home equity lines of credit.
	(f)	The unused portion of revolving lines of credit reset at prevailing market rates and, as such, approximate market value.
	Revolving credit line commitments contain an element of credit risk. Management reduces its credit risk for unused revolving credit line commitments by applying the same credit policies in making commitments as it does for extending loans. We typically require collateral as these commitments are drawn.
	Lease Commitments
	Future minimum rental payments required under operating leases, primarily for real property, with noncancelable lease terms expiring after December 31, 2013, are as follows.
	Year ended December 31, ($ in millions)
	2014	$	39
	2015	34
	2016	18
	2017	5
	2018	—
	2019 and thereafter	—
	Total minimum payment required	$	96
	Certain of the leases contain escalation clauses and renewal or purchase options. Rental expenses under operating leases were $47 million, $63 million, and $79 million in 2013, 2012, and 2011, respectively.
	Contractual Commitments
	We have entered into multiple agreements for information technology, marketing and advertising, and voice and communication technology and maintenance. Many of the agreements are subject to variable price provisions, fixed or minimum price provisions, and termination or renewal provisions.
	Year ended December 31, ($ in millions)
	2014	$	76
	2015 and 2016	2
	Total future payment obligations	$	78

Contingencies_And_Other_Risks

Contingencies And Other Risks	12 Months Ended
	Dec. 31, 2013
Loss Contingency [Abstract]	'
Contingencies Disclosure and Other Risks [Text Block]	'
	Contingencies and Other Risks
	In the normal course of business, we enter into transactions that expose us to varying degrees of risk.
	Concentration with GM and Chrysler
	The profitability and financial condition of our operations are heavily dependent upon the performance, operations, and prospects of GM, Chrysler, and their dealers. We were previously party to agreements with each of GM and Chrysler that provided for certain exclusivity privileges related to subvention programs that they offered. Our agreement with Chrysler expired in April 2013. In addition, our agreement with GM expired effective February 28, 2014. These agreements provided Ally with certain preferred provider benefits, including limiting the use of other financing providers by GM and Chrysler for their incentive programs. We entered into a new auto financing agreement with GM that became effective on March 1, 2014 (the GM Agreement), which provides a general framework for dealer and consumer financing related to GM vehicles, as well as with respect to our ongoing participation in GM subvention programs. The GM Agreement does not provide Ally with any exclusivity or similar privileges related to the financing of GM vehicles, whether through subvention programs or otherwise. The GM Agreement is cancellable upon notice by either party after one year.
	Mortgage-Related Matters
	ResCap Bankruptcy Filing
	Our mortgage operations were historically a significant portion of our operations and were conducted primarily through our Residential Capital, LLC (ResCap) subsidiary. On May 14, 2012, ResCap and certain of its wholly owned direct and indirect subsidiaries (collectively, the Debtors) filed voluntary petitions for relief under Chapter 11 of the Bankruptcy Code in the United States Bankruptcy Court for the Southern District of New York (the Bankruptcy Court). On May 14, 2013, Ally Financial Inc., on behalf of itself and certain of its subsidiaries (collectively, AFI) entered into a Plan Support Agreement (the PSA) with the Debtors, the official committee of unsecured creditors appointed in the Debtors’ Chapter 11 cases, and certain creditors. The PSA, which was approved by the Bankruptcy Court on June 26, 2013, required the parties to support a Chapter 11 plan in the Debtors’ Chapter 11 cases (the Plan) that, among other things, settled and provided AFI full releases for all existing and potential claims between AFI and the Debtors, including all representation and warranty claims that resided with the Debtors, as well as full releases for all pending and potential claims related to the Debtors that have been or could be brought against AFI by third parties.
	On July 3, 2013, the Debtors filed the Plan and related disclosure statement (the Disclosure Statement), with the Bankruptcy Court. The Bankruptcy Court entered an order approving the Disclosure Statement on August 23, 2013. The Plan provided, among other things, that on the effective date of the Plan, AFI would contribute to the Debtors' estates $1.95 billion in cash or cash equivalents, and will further contribute $150 million received by AFI for claims it pursues against its insurance carriers related to the claims released in connection with the Plan, with such amount guaranteed by AFI to be paid no later than September 30, 2014. The Bankruptcy Court entered an order confirming the Plan on December 11, 2013, which became effective on December 17, 2013. The confirmed Plan excludes from the third party releases the Federal National Mortgage Association (Fannie Mae) and the Federal Home Loan Mortgage Corporation (Freddie Mac), and the Federal Housing Finance Agency (the FHFA) as conservator for Fannie Mae and Freddie Mac, with respect to certain ordinary-course claims against Ally Bank as a former mortgage seller and servicer, as well as the Department of Justice and state attorneys general with respect to certain types of claims. Further, AFI has agreed to settlements with each of the FHFA and the Federal Deposit Insurance Corporation (FDIC), as receiver for certain failed banks, pursuant to which, among other things, in exchange for a monetary payment, the FHFA’s and FDIC’s previously pending lawsuits against AFI were dismissed. For further information with respect to the bankruptcy, refer to Note 1.
	Mortgage Settlements and Consent Order
	On February 9, 2012, we announced that we had reached an agreement with respect to investigations into procedures followed by mortgage servicing companies and banks in connection with mortgage origination and servicing activities and foreclosure home sales and evictions (the Mortgage Settlement). Further, as a result of an examination conducted by the FRB and FDIC, on April 13, 2011, we entered into a consent order (the Consent Order) with the FRB and the FDIC, that required, among other things, GMAC Mortgage, LLC to retain independent consultants to conduct a risk assessment related to mortgage servicing activities and, separately, to conduct a review of certain past residential mortgage foreclosure actions. As a result of the Plan becoming effective, the Debtors will remain responsible for all costs and obligations imposed on the Debtors under the Mortgage Settlement and Consent Order.
	Legal Proceedings
	We are or may be subject to potential liability under various governmental proceedings, claims, and legal actions that are pending or otherwise asserted against us. We are named as defendants in a number of legal actions, and we are involved in governmental proceedings arising in connection with our respective businesses. Some of the pending actions purport to be class actions, and certain legal actions include claims for substantial compensatory and/or punitive damages or claims for indeterminate amounts of damages. We establish reserves for legal claims when payments associated with the claims become probable and the payments can be reasonably estimated. Given the inherent difficulty of predicting the outcome of litigation and regulatory matters, it is generally very difficult to predict what the eventual outcome will be, and when the matter will be resolved. The actual costs of resolving legal claims may be higher or lower than any amounts reserved for the claims.
	On the basis of information currently available, advice of counsel, available insurance coverage, and established reserves, it is the opinion of management that the eventual outcome of the current actions against us will not have a material adverse effect on our consolidated financial condition, results of operations, or cash flows. However, it is possible that the ultimate resolution of legal matters, if unfavorable, may be material to our consolidated financial condition, results of operations, or cash flows in a particular period.
	Regulatory Matters
	Ally and its subsidiaries, including Ally Bank, are or may become involved from time to time in reviews, investigations, and proceedings (both formal and informal), and information-gathering requests, by government and self-regulatory agencies, including the FRB, FDIC, Utah DFI, CFPB, U.S. Department of Justice (DOJ), SEC, and the Federal Trade Commission regarding their respective operations. Such requests include subpoenas from each of the SEC and the DOJ. The subpoenas and document requests from the SEC include information covering a wide range of mortgage-related matters, and the subpoenas received from the DOJ include a broad request for documentation and other information in connection with its investigations of potential fraud and other potential legal violations related to mortgage-backed securities, as well as the origination and/or underwriting of mortgage loans.
	Further, in December 2013, Ally Financial Inc. and Ally Bank entered into Consent Orders issued by the CFPB and the DOJ pertaining to the allegation of disparate impact in the automotive finance business, which resulted in a $98 million charge in the fourth quarter of 2013. The Consent Orders require Ally to create a compliance plan addressing, at a minimum, the communication of Ally’s expectations of Equal Credit Opportunity Act compliance to dealers, maintenance of Ally’s existing limits on dealer finance income for contracts acquired by Ally, and monitoring for potential discrimination both at the dealer level and across all dealers. Ally also must form a compliance committee consisting of Ally and Ally Bank directors to oversee Ally’s execution of the Consent Orders’ terms. Failure to achieve certain remediation targets could result in the payment of additional amounts in the future.
	Investigations, proceedings or information-gathering requests that Ally is, or may become, involved in may result in material adverse consequences including without limitation, adverse judgments, settlements, fines, penalties, injunctions, or other actions.
	Loan Repurchases and Obligations Related to Loan Sales
	Representation and Warranty Obligation Reserve Methodology
	The representation and warranty reserve was $45 million at December 31, 2013 with respect to our sold and serviced loans for which we have retained representation and warranty obligation. The liability for representation and warranty obligations reflects management's best estimate of probable losses with respect to Ally Bank's mortgage loans sold to Fannie Mae and Freddie Mac. We considered historical and recent demand trends in establishing the reserve. The methodology used to estimate the reserve considers a variety of assumptions including borrower performance (both actual and estimated future defaults), repurchase demand behavior, historical loan defect experience, historical mortgage insurance rescission experience, and historical and estimated future loss experience, which includes projections of future home price changes as well as other qualitative factors including investor behavior. It is difficult to predict and estimate the level and timing of any potential future demands. In cases where we may not be able to reasonably estimate losses, a liability is not recognized. Management monitors the adequacy of the overall reserve and makes adjustments to the level of reserve, as necessary, after consideration of other qualitative factors including ongoing dialogue and experience with counterparties. At the time a loan is sold, an estimate of the fair value of the liability is recorded and classified in accrued expenses and other liabilities on our Consolidated Balance Sheet and recorded as a component of gain (loss) on mortgage and automotive loans, net, in our Consolidated Statement of Income. We recognize changes in the liability when additional relevant information becomes available. Changes in the estimate are recorded as other operating expenses in our Consolidated Statement of Income.
	On April 16, 2013, we completed the sales of agency MSRs to Ocwen and Quicken. The sale to Ocwen included the transfer of the origination representation and warranty liabilities (but not those related to servicing) on any and all claims following the sale of the MSRs through an indemnification agreement. However, Ally Bank retained all representation and warranty liability related to loans previously liquidated with a loss (e.g. GSEs completed a foreclosure) as well as the liability on outstanding claims at the time of the sale. The MSRs sale to Quicken did not include the transfer of representation and warranty liabilities. The repurchase reserve at December 31, 2013 reflects probable losses associated with the contractual obligation retained.
	Other Contingencies
	We are subject to potential liability under various other exposures including tax, nonrecourse loans, self-insurance, and other miscellaneous contingencies. We establish reserves for these contingencies when the loss becomes probable and the amount can be reasonably estimated. The actual costs of resolving these items may be substantially higher or lower than the amounts reserved for any one item. Based on information currently available, it is the opinion of management that the eventual outcome of these items will not have a material adverse impact on our results of operations, financial position, or cash flows.

Quarterly_Financial_Statments_

Quarterly Financial Statments (unaudited)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Statements [Abstract]	'
Quarterly Financial Information [Text Block]	'
	Quarterly Financial Statements (unaudited)
	($ in millions)	First			Second			Third			Fourth
		quarter			quarter			quarter			quarter
	2013
	Net financing revenue	$	640		$	628		$	737		$	774
	Other revenue	386			402			371			325
	Total net revenue	1,026			1,030			1,108			1,099
	Provision for loan losses	131			89			141			140
	Total noninterest expense	958			801			762			884
	(Loss) income from continuing operations before income tax (benefit) expense	(63		)	140			205			75
	Income tax (benefit) expense from continuing operations	(123		)	40			28			(4		)
	Net income from continuing operations	60			100			177			79
	Income (loss) from discontinued operations, net of tax	1,033			(1,027		)	(86		)	25
	Net income (loss)	$	1,093		$	(927	)	$	91		$	104
	Basic earnings per common share
	Net loss from continuing operations	$	(105	)	$	(75	)	$	(18	)	$	(270	)
	Net income (loss)	671			(847		)	(82		)	(251		)
	Diluted earnings per common share
	Net loss from continuing operations	$	(105	)	$	(75	)	$	(18	)	$	(270	)
	Net income (loss)	671			(847		)	(82		)	(251		)
	2012
	Net financing revenue	$	351		$	457		$	472		$	611
	Other revenue	605			714			775			480
	Total net revenue	956			1,171			1,247			1,091
	Provision for loan losses	98			33			105			93
	Total noninterest expense	855			971			845			951
	Income from continuing operations before income tax expense (benefit)	3			167			297			47
	Income tax expense (benefit) from continuing operations	1			(16		)	46			(887		)
	Net income from continuing operations	2			183			251			934
	Income (loss) from discontinued operations, net of tax	308			(1,081		)	133			466
	Net income (loss)	$	310		$	(898	)	$	384		$	1,400
	Basic earnings per common share
	Net (loss) income from continuing operations	$	(149	)	$	(13	)	$	38		$	551
	Net income (loss)	82			(825		)	137			901
	Diluted earnings per common share
	Net (loss) income from continuing operations	$	(149	)	$	(13	)	$	38		$	455
	Net income (loss)	82			(825		)	137			700

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]	'
Subsequent Events [Text Block]	'
	Subsequent Events
	U.S. Department of the Treasury Sale of Ally Common Stock
	On January 23, 2014, Treasury sold 410,000 shares of Ally Financial Inc. common stock in a private offering. Treasury obtained gross proceeds of $3.0 billion from the common stock offering. At the conclusion of this sale, Treasury held approximately 37 percent of Ally's common stock.
	Notes Offering
	On January 22, 2014, we completed a securities offering of $750 million in aggregate principal amount of 3.5% Ally senior guaranteed notes with a January 2019 maturity date.
	Declaration of Quarterly Dividend Payments
	On January 2, 2014, the Ally Board of Directors declared quarterly dividend payments on certain outstanding preferred stock. This included a cash dividend of $18.08 per share, or a total of $47 million, on Fixed Rate Cumulative Perpetual Preferred Stock, Series G; and a cash dividend of $0.53 per share, or a total of $22 million, on Fixed Rate/Floating Rate Perpetual Preferred Stock, Series A. The dividends were paid on February 18, 2014.

Description_Of_Business_Basis_1

Description Of Business, Basis of Presentation, And Changes in Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Consolidation, Policy [Policy Text Block]	'
	The Consolidated Financial Statements include our accounts and accounts of our majority-owned subsidiaries, after eliminating intercompany balances and transactions, and include all variable interest entities (VIEs) in which we are the primary beneficiary. Refer to Note 9 for further details on our VIEs.
Basis of Accounting [Text Block]	'
	Our accounting and reporting policies conform to accounting principles generally accepted in the United States of America (GAAP). Additionally, where applicable, the policies conform to the accounting and reporting guidelines prescribed by bank regulatory authorities.
Use of Estimates, Policy [Policy Text Block]	'
	Use of Estimates and Assumptions
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and that affect income and expenses during the reporting period and related disclosures. In developing the estimates and assumptions, management uses all available evidence; however, actual results could differ because of uncertainties associated with estimating the amounts, timing, and likelihood of possible outcomes.
Cash and Cash Equivalents, Policy [Policy Text Block]	'
	Cash and Cash Equivalents
	Cash and cash equivalents include cash on hand and certain highly liquid investment securities with maturities of three months or less from the date of purchase. Cash and cash equivalents that have restrictions on our ability to withdraw the funds are included in other assets on our Consolidated Balance Sheet. The book value of cash equivalents approximates fair value because of the short maturities of these instruments.
Marketable Securities, Policy [Policy Text Block]	'
	Securities
	Our portfolio of securities includes government securities, corporate bonds, asset- and mortgage-backed securities (MBS), interests in securitization trusts, equity securities, and other investments. Securities are classified based on management's intent. Our securities are primarily classified as available-for-sale and carried at fair value with unrealized gains and losses included in accumulated other comprehensive income or loss, on an after-tax basis. Premiums and discounts on debt securities are amortized as an adjustment to investment yield generally over the stated maturity of the security. We employ a systematic methodology that considers available evidence in evaluating potential other-than-temporary impairment of our investments classified as available-for-sale. If the cost of an investment exceeds its fair value, we evaluate, among other factors, the magnitude and duration of the decline in fair value. We also evaluate the financial health of and business outlook for the issuer, the performance of the underlying assets for interests in securitized assets, and our intent and ability to hold the investment.
	Once a decline in fair value of a debt security is determined to be other-than-temporary, an impairment charge for the credit component is recorded to other gain (loss) on investments, net, in our Consolidated Statement of Income, and a new cost basis in the investment is established. Noncredit component losses of a debt security are recorded in other comprehensive income (loss) when we do not intend to sell the security or it is not more likely than not that we will have to sell the security prior to the security's anticipated recovery. Subsequent increases and decreases to the fair value of available-for-sale securities are included in other comprehensive income (loss), so long as they are not attributable to another other-than-temporary impairment.
	Realized gains and losses on investment securities are reported in other gain (loss) on investments, net, and are determined using the specific identification method.
	For information on investment securities refer to Note 6.
Finance, Loans and Leases Receivable, Policy [Policy Text Block]	'
	Finance Receivables and Loans
	Finance receivables and loans are reported at the principal amount outstanding, net of unearned income, premiums and discounts, and allowances. Unearned income, which includes unearned rate support received from an automotive manufacturer on certain automotive loans and deferred origination fees reduced by origination costs, is amortized over the contractual life of the related finance receivable or loan using the effective interest method. We make incentive payments for consumer automobile loan originations to automotive dealers under our Ally Dealer Rewards Program and account for these payments as direct loan origination costs. Loan commitment fees are generally deferred and amortized over the commitment period. For information on finance receivables and loans, refer to Note 7.
	We classify finance receivables and loans between loans held-for-sale and loans held-for-investment based on management's assessment of our intent and ability to hold loans for the foreseeable future or until maturity. Management's intent and ability with respect to certain loans may change from time to time depending on a number of factors including economic, liquidity, and capital conditions. Management's view of the foreseeable future is based on the longest reasonably reliable net income, liquidity, and capital forecast period.
	Our portfolio segments are based on the level at which we develop and document our methodology for determining the allowance for loan losses. Additionally, the classes of finance receivables are based on several factors including the method for monitoring and assessing credit risk, the method of measuring carrying value, and the risk characteristics of the finance receivable. Based on an evaluation of our process for developing the allowance for loan losses including the nature and extent of exposure to credit risk arising from finance receivables, we have determined our portfolio segments to be consumer automobile, consumer mortgage, and commercial.
	•	Consumer automobile — Consists of retail automobile financing for new and used vehicles.
	•	Consumer mortgage — Consists of first mortgage, subordinate-lien mortgages and home equity loans.
	•	Commercial — Consists of the following classes of finance receivables.
	•	Commercial and Industrial
	•	Automobile — Consists of financing operations to fund dealer purchases of new and used vehicles through wholesale or floorplan financing. Additional commercial offerings include automotive dealer term loans, revolving lines of credit, and dealer fleet financing.
	•	Mortgage — Consists primarily of warehouse lending.
	•	Other — Consists of senior secured commercial lending.
	•	Commercial Real Estate — Automobile — Consists of term loans to finance dealership land and buildings.
	Nonaccrual Loans
	Revenue recognition is suspended when any finance receivables and loans are placed on nonaccrual status. Generally, all classes of finance receivables and loans are placed on nonaccrual status when principal or interest has been delinquent for 90 days or when full collection is determined not to be probable. Exceptions include commercial real estate loans that are placed on nonaccrual status when delinquent for 60 days. These loans are reported as nonperforming loans in Note 7. Revenue accrued, but not collected, at the date finance receivables and loans are placed on nonaccrual status is reversed and subsequently recognized only to the extent it is received in cash or until it qualifies for return to accrual status. However, where there is doubt regarding the ultimate collectability of loan principal, all cash received is applied to reduce the carrying value of such loans. Finance receivables and loans are restored to accrual status only when contractually current and the collection of future payments is reasonably assured.
	Generally, we recognize all classes of loans as past due when they are 30 days delinquent on making a contractually required payment.
	Impaired Loans
	All classes of loans are considered impaired when we determine it is probable that we will be unable to collect all amounts due (both principal and interest) according to the terms of the loan agreement.
	For all classes of consumer loans, impaired loans are loans that have been modified in troubled debt restructurings (TDRs).
	All classes of commercial loans are considered impaired on an individual basis and reported as impaired when we determine it is probable that we will be unable to collect all amounts due according to the terms of the loan agreement.
	With exception of certain consumer TDRs that have been returned to accruing status, for all classes of impaired loans, income recognition is consistent with that of nonaccrual loans discussed above. For collateral dependent loans, if the recorded investment in impaired loans exceeds the fair value of the collateral, a charge-off is recorded consistent with the TDR discussion below.
	Troubled Debt Restructurings (TDRs)
	When the terms of finance receivables or loans are modified, consideration must be given as to whether or not the modification results in a TDR. A modification is considered to be a TDR when both a) the borrower is experiencing financial difficulty and b) we grant a concession to the borrower. These considerations require significant judgment and vary by portfolio segment. In all cases, the cumulative impacts of all modifications are considered at the time of the most recent modification.
	For all classes of consumer loans, various qualitative factors are utilized for assessing the financial difficulty of the borrower. These include, but are not limited to, the borrowers default status on any of its debts, bankruptcy and recent changes in financial circumstances (loss of job, etc.). A concession has been granted when as a result of the modification we do not expect to collect all amounts due, including interest accrued at the original contract rate. Types of modifications that may be considered concessions include, but are not limited to, extensions of terms at a rate that does not constitute a market rate, a reduction, deferral or forgiveness of principal or interest owed and loans that have been discharged in a Chapter 7 Bankruptcy and have not been reaffirmed by the borrower.
	In addition to the modifications noted above, in our consumer automobile class of loans we also provide extensions or deferrals of payments to borrowers who we deem to be experiencing only temporary financial difficulty. In these cases, there are limits within our operational policies to minimize the number of times a loan can be extended, as well as limits to the length of each extension, including a cumulative cap over the life of the loan. Before offering an extension or deferral, we evaluate the capacity of the customer to make the scheduled payments after the deferral period. During the deferral period, we continue to accrue and collect interest on the loan as part of the deferral agreement. We grant these extensions or deferrals when we expect to collect all amounts due including interest accrued at the original contract rate.
	A restructuring that results in only a delay in payment that is deemed to be insignificant is not a concession and the modification is not considered to be a TDR. In order to assess whether a restructuring that results in a delay in payment is insignificant, we consider the amount of the restructured payments subject to delay in conjunction with the unpaid principal balance or the collateral value of the loan, whether or not the delay is significant with respect to the frequency of payments under the original contract, or the loan's original expected duration. In the cases where payment extensions on our automobile loan portfolio cumulatively extend beyond 90 days and are more than 10% of the original contractual term or any cumulative extension beyond 180 days, we deem the delay in payment to be more than insignificant, and as such, classify these types of modifications as TDRs. Otherwise, we believe that the modifications do not represent a concessionary modification and accordingly, they are not classified as TDRs.
	For all classes of commercial loans, similar qualitative factors are considered when assessing the financial difficulty of the borrower. In addition to the factors noted above, consideration is also given to the borrower's forecasted ability to service the debt in accordance with the contractual terms, possible regulatory actions and other potential business disruptions (e.g., the loss of a significant customer or other revenue stream). Consideration of a concession is also similar for commercial loans. In addition to the factors noted above, consideration is also given to whether additional guarantees or collateral have been provided.
	For all loans, TDR classification typically results from our loss mitigation activities. For loans held-for-investment that are not carried at fair value and are TDRs, impairment is typically measured based on the differences between the net carrying value of the loan and the present value of the expected future cash flows of the loan. The loan may also be measured for impairment based on the fair value of the underlying collateral less costs to sell for loans that are collateral dependent. We recognize impairment by either establishing a valuation allowance or recording a charge-off.
	The financial impacts of modifications that meet the definition of a TDR are reported in the period in which they are identified as TDRs. Additionally, if a loan that is classified as a TDR redefaults within twelve months of the modification, we are required to disclose the instances of redefault. For the purpose of this disclosure, we have determined that a loan is considered to have redefaulted when the loan meets the requirements for evaluation under our charge-off policy except for commercial loans where redefault is defined as 90 days past due.
	Our policy is to generally place all TDRs on nonaccrual status until the loan has been brought fully current, the collection of contractual principal and interest is reasonably assured, and six consecutive months of repayment performance is achieved. In certain cases, if a borrower has been current up to the time of the modification and repayment of the debt subsequent to the modification is reasonably assured, we may choose to continue to accrue interest on the loan.
	Charge-offs
	As a general rule, consumer automobile loans are written down to estimated collateral value, less costs to sell, once a loan becomes 120 days past due. In our consumer mortgage segment, first-lien mortgages and a subset of our home equity portfolio that are secured by real estate in a first-lien position are written down to the estimated fair value of the collateral, less costs to sell, once a mortgage loan becomes 180 days past due. Consumer mortgage loans that represent second-lien positions are charged off at 180 days past due. Consumer mortgage loans within our second-lien portfolio in bankruptcy that are 60 days past due are fully charged off within 60 days of receipt of notification of filing from the bankruptcy court. Consumer automobile and first-lien consumer mortgage loans in bankruptcy that are 60 days past due are written down to the estimated fair value of the collateral, less costs to sell, within 60 days of receipt of notification of discharge from the bankruptcy court. Regardless of other timelines noted within this policy, loans are considered collateral dependent once foreclosure or repossession proceedings begin and are charged off to the estimated fair value of the underlying collateral, less costs to sell at that time.
	Commercial loans are individually evaluated and where collectability of the recorded balance is in doubt are written down to the estimated fair value of the collateral less costs to sell. Generally, all commercial loans are charged off when it becomes unlikely that the borrower is willing or able to repay the remaining balance of the loan and any underlying collateral is not sufficient to recover the outstanding principal. Collateral dependent loans are charged-off to the fair market value of collateral less costs to sell and non-collateral dependent loans are fully written-off.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	'
	Allowance for Loan Losses
	The allowance for loan losses (the allowance) is management's estimate of incurred losses in the lending portfolios. We determine the amount of the allowance required for each of our portfolio segments based on its relative risk characteristics. The evaluation of these factors for both consumer and commercial finance receivables and loans involves quantitative analysis combined with sound management judgment. Additions to the allowance are charged to current period earnings through the provision for loan losses; amounts determined to be uncollectible are charged directly against the allowance, net of amounts recovered on previously charged-off accounts.
	The allowance is comprised of two components: specific reserves established for individual loans evaluated as impaired and portfolio-level reserves established for large groups of typically smaller balance homogeneous loans that are collectively evaluated for impairment. We evaluate the adequacy of the allowance based on the combined total of these two components. Determining the appropriateness of the allowance is complex and requires judgment by management about the effect of matters that are inherently uncertain. It is possible that others, given the same information, may at any point in time reach different reasonable conclusions.
	Measurement of impairment for specific reserves is generally determined on a loan-by-loan basis. Loans determined to be specifically impaired are measured based on the present value of expected future cash flows discounted at the loan's effective interest rate, an observable market price, or the estimated fair value of the collateral less estimated costs to sell, whichever is determined to be the most appropriate. When these measurement values are lower than the carrying value of that loan, impairment is recognized. Loans that are not identified as individually impaired are pooled with other loans with similar risk characteristics for evaluation of impairment for the portfolio-level allowance.
	For the purpose of calculating portfolio-level reserves, we have grouped our loans into three portfolio segments: consumer automobile, consumer mortgage, and commercial. The allowance consists of the combination of a quantitative assessment component based on statistical models, a retrospective evaluation of actual loss information to loss forecasts, and includes a qualitative component based on management judgment. Management takes into consideration relevant qualitative factors, including external and internal trends such as the impacts of changes in underwriting standards, collections and account management effectiveness, geographic concentrations, and economic events, among other factors, that have occurred but are not yet reflected in the quantitative assessment component. Qualitative adjustments are documented, reviewed, and approved through our established risk governance processes. Refer to Note 7 for information on the allowance for loan losses.
	Consumer Loans
	Our consumer automobile and consumer mortgage portfolio segments are reviewed for impairment based on an analysis of loans that are grouped into common risk categories (i.e., past due status, loan or lease type, collateral type, borrower, industry or geographic concentrations). We perform periodic and systematic detailed reviews of our lending portfolios to identify inherent risks and to assess the overall collectability of those portfolios. Loss models are utilized for these portfolios, which consider a variety of credit quality indicators including, but not limited to, historical loss experience, current economic conditions, anticipated repossessions or foreclosures based on portfolio trends, delinquencies and credit scores, and expected loss factors by loan type.
	Consumer Automobile Portfolio Segment
	The allowance for loan losses within the consumer automobile portfolio segment is calculated using proprietary statistical models and other risk indicators applied to pools of loans with similar risk characteristics, including credit bureau score and loan-to-value ratios to arrive at an estimate of incurred losses in the portfolio. These statistical loss forecasting models are utilized to estimate incurred losses and consider a variety of factors including, but not limited to, historical loss experience, estimated defaults based on portfolio trends, delinquencies, and general economic and business trends. These statistical models predict forecasted losses inherent in the portfolio based on both vintage and migration analyses.
	The forecasted losses consider historical factors such as frequency (the number of contracts that we expect to default) and loss severity (the expected loss on a per vehicle basis). The loss severity within the consumer automobile portfolio segment is impacted by the market values of vehicles that are repossessed. Vehicle market values are affected by numerous factors including vehicles supply, the condition of the vehicle upon repossession, the overall price and volatility of gasoline or diesel fuel, consumer preference related to specific vehicle segments, and other factors. The historical loss experience is updated quarterly to incorporate the most recent data reflective of the current economic environment.
	The quantitative assessment component is supplemented with qualitative reserves based on management's determination that such adjustments provide a better estimate of credit losses. This qualitative assessment takes into consideration relevant internal and external factors that have occurred but are not yet reflected in the forecasted losses and may affect the performance of the portfolio.
	Our methodology and policies with respect to the allowance for loan losses for our consumer automobile portfolio segment did not change during 2013.
	Consumer Mortgage Portfolio Segment
	The allowance for loan losses within the consumer mortgage portfolio segment is calculated by using proprietary statistical models based on pools of loans with similar risk characteristics, including credit score, loan-to-value, loan age, documentation type, product type, and loan purpose, to arrive at an estimate of incurred losses in the portfolio. These statistical loss forecasting models are utilized to estimate incurred losses and consider a variety of factors including, but not limited to, historical loss experience, estimated foreclosures or defaults based on portfolio trends, delinquencies, and general economic and business trends.
	The forecasted losses are statistically derived based on a suite of behavioral based transition models. This transition framework predicts various stages of delinquency, default, and voluntary prepayment over the course of the life of the loan. The transition probability is a function of the loan and borrower characteristics and economic variables and considers historical factors such as frequency (the number of contracts that we expect to default) and loss severity (the expected loss on a per loan basis). When a default event is predicted, a severity model is applied to estimate future loan losses. Loss severity within the consumer mortgage portfolio segment is impacted by the market values of foreclosed properties, which is affected by numerous factors, including geographic considerations and the condition of the foreclosed property. The historical loss experience is updated quarterly to incorporate the most recent data reflective of the current economic environment.
	The quantitative assessment component is supplemented with qualitative reserves based on management's determination that such adjustments provide a better estimate of credit losses. This qualitative assessment takes into consideration relevant internal and external factors that have occurred but are not yet reflected in the forecasted losses and may affect the credit quality of the portfolio.
	Our methodology and policies with respect to the allowance for loan losses for our consumer mortgage portfolio segment did not change during 2013.
	Commercial Loans
	The allowance for loan losses within the commercial portfolio is comprised of reserves established for specific loans evaluated as impaired and portfolio-level reserves based on nonimpaired loans grouped into pools based on similar risk characteristics and collectively evaluated.
	A commercial loan is considered impaired when it is probable that we will be unable to collect all amounts due according to the contractual terms of the loan agreement based on current information and events. These loans are primarily evaluated individually and are risk-rated based on borrower, collateral, and industry-specific information that management believes is relevant in determining the occurrence of a loss event and measuring impairment. Management establishes specific allowances for commercial loans determined to be individually impaired based on the present value of expected future cash flows, discounted at the loan's effective interest rate, observable market price or the fair value of collateral, whichever is determined to be the most appropriate. Estimated costs to sell or realize the value of the collateral on a discounted basis are included in the impairment measurement, when appropriate.
	Loans not identified as impaired are grouped into pools based on similar risk characteristics and collectively evaluated. Our risk rating models use historical loss experience, concentrations, current economic conditions, and performance trends. The commercial historical loss experience is updated quarterly to incorporate the most recent data reflective of the current economic environment. The determination of the allowance is influenced by numerous assumptions and many factors that may materially affect estimates of loss, including volatility of loss given default, probability of default, and rating migration. In assessing the risk rating of a particular loan, several factors are considered including an evaluation of historical and current information involving subjective assessments and interpretations. In addition, the allowance related to the commercial portfolio segment is influenced by estimated recoveries from automotive manufacturers relative to guarantees or agreements with them to repurchase vehicles used as collateral to secure the loans.
	The quantitative assessment component may be supplemented with qualitative reserves based on management's determination that such adjustments provide a better estimate of credit losses. This qualitative assessment takes into consideration relevant internal and external factors that have occurred and may affect the credit quality of the portfolio.
	Our methodology and policies with respect to the allowance for loan losses for our commercial portfolio segment did not change during 2013.
Consolidation, Variable Interest Entity, Policy [Policy Text Block]	'
	Securitizations and Variable Interest Entities
	We securitize, transfer, and service consumer automobile loans, operating leases, and wholesale loans. Securitization transactions typically involve the use of variable interest entities and are accounted for either as sales or secured financings. We may retain economic interests in the securitized and sold assets, which are generally retained in the form of senior or subordinated interests, interest- or principal-only strips, cash reserve accounts, residual interests, and servicing rights.
	In order to conclude whether or not a variable interest entity is required to be consolidated, careful consideration and judgment must be given to our continuing involvement with the variable interest entity. In circumstances where we have both the power to direct the activities of the entity that most significantly impact the entity's performance and the obligation to absorb losses or the right to receive benefits of the entity that could be significant, we would conclude that we would consolidate the entity, which would also preclude us from recording an accounting sale on the transaction. In the case of a consolidated variable interest entity, the accounting is consistent with a secured financing, (i.e., we continue to carry the loans and we record the related securitized debt on our balance sheet).
	In transactions where either one or both of the power or economic criteria mentioned above are not met, we then must determine whether or not we achieve a sale for accounting purposes. In order to achieve a sale for accounting purposes, the assets being transferred must be legally isolated, not be constrained by restrictions from further transfer, and be deemed to be beyond our control. If we were to fail any of the three criteria for sale accounting, the accounting would be consistent with the preceding paragraph (i.e., a secured borrowing). Refer to Note 9 for discussion on variable interest entities.
	Gains or losses on off-balance sheet securitizations take into consideration the fair value of the retained interests including the value of certain servicing assets or liabilities, if any, which are initially recorded at fair value at the date of sale. The estimate of the fair value of the retained interests and servicing requires us to exercise significant judgment about the timing and amount of future cash flows from the interests. Refer to Note 24 for a discussion of fair value estimates.
	Gains or losses on off-balance sheet securitizations and sales are reported in gain (loss) on mortgage and automotive loans, net, in our Consolidated Statement of Income for consumer automobile loans, and wholesale loans. Declines in the fair value of retained interests below the carrying amount are reflected in other comprehensive income, or as other gain on investments, net, in our Consolidated Statement of Income if such declines are determined to be other-than-temporary or if the interests are classified as trading. Retained interests, as well as any purchased securities, are generally included in available-for-sale investment securities, trading investment securities, or other assets. Designation as available-for-sale or trading depends on management's intent. Securities that are noncertificated and cash reserve accounts related to securitizations are included in other assets on our Consolidated Balance Sheet.
	We retain servicing responsibilities for all of our consumer automobile loan, operating lease, and wholesale loan securitizations. We may receive servicing fees based on the securitized loan balances and certain ancillary fees, all of which are reported in servicing fees in the Consolidated Statement of Income.
	Whether on- or off-balance sheet, the investors in the securitization trusts generally have no recourse to our assets outside of customary market representation and warranty repurchase provisions.
Loans and Leases Receivable, Mortgage Banking Activities, Policy [Policy Text Block]	'
	Mortgage Servicing Rights
	We capitalized the value expected to be realized from performing specified mortgage servicing activities for others as mortgage servicing rights (MSRs) when the expected future cash flows from servicing were projected to be more than adequate compensation for such activities. These capitalized servicing rights were purchased or retained upon sale or securitization of mortgage loans. MSRs were not recorded on securitizations accounted for as secured financings.
	We measured all mortgage servicing assets and liabilities at fair value. We defined our servicing rights based on both the availability of market inputs and the manner in which we managed the risks of our servicing assets and liabilities. We leveraged all available relevant market data to determine the fair value of our recognized servicing assets and liabilities. We sold our remaining MSRs during the year ended December 31, 2013. Refer to Note 10 for further details.
Finance, Loan and Lease Receivables, Held for Investments, Foreclosed Assets Policy [Policy Text Block]	'
	Repossessed and Foreclosed Assets
	Assets are classified as repossessed and foreclosed and included in other assets when physical possession of the collateral is taken regardless of whether foreclosure proceedings have taken place. Repossessed and foreclosed assets are carried at the lower of the outstanding balance at the time of repossession or foreclosure or the fair value of the asset less estimated costs to sell. Losses on the revaluation of repossessed and foreclosed assets are charged to the allowance for loan losses at the time of repossession. Declines in value after repossession are charged to other operating expenses for loans and depreciation expense for operating lease assets as incurred.
Revenue Recognition Leases, Operating [Policy Text Block]	'
	Investment in Operating Leases
	Investment in operating leases represents the automobiles that are underlying the automotive lease contracts and is reported at cost, less accumulated depreciation and net of impairment charges and origination fees or costs. Depreciation of vehicles is generally provided on a straight-line basis to an estimated residual value over the lease term. Manufacturer support payments that we receive are treated as a reduction to the cost-basis in the underlying lease asset, which has the effect of reducing depreciation expense over the life of the contract. We periodically evaluate our depreciation rate for leased vehicles based on projected residual values. Income from operating lease assets that includes lease origination fees, net of lease origination costs, is recognized as operating lease revenue on a straight-line basis over the scheduled lease term.
	We have significant investments in the residual values of the assets in our operating lease portfolio. The residual values represent an estimate of the values of the assets at the end of the lease contracts. At contract inception, we determine the projected residual value based on an internal evaluation of the expected future value. This evaluation is based on a proprietary model, which includes variables such as age, mileage, seasonality, segment factors, vehicle type, economic indicators and production cycle. This internally generated data is compared against third party, independent data for reasonableness and analysis. Realization of the residual values is dependent on our future ability to market the vehicles under the prevailing market conditions. Over the life of the lease, we evaluate the adequacy of our estimate of the residual value and may make adjustments to the depreciation rates to the extent the expected value of the vehicle (including any residual support payments) at lease termination changes. In addition to estimating the residual value at lease termination, we also evaluate the current value of the operating lease asset and test for impairment to the extent necessary based on market considerations and portfolio characteristics. Impairment is determined to exist if the undiscounted expected future cash flows are lower than the carrying value of the asset. If our operating lease assets are considered to be impaired, the impairment is measured as the amount by which the carrying amount of the assets exceeds the fair value as estimated by discounted cash flows. The accrual of revenue on operating leases is generally discontinued at the time an account is determined to be uncollectible, at the earliest of time of repossession, within 60 days of bankruptcy notification and greater than 60 days past due, or greater than 120 days past due.
	When a lease vehicle is returned to us, the asset is reclassified from investment in operating leases, net, to other assets and recorded at the lower-of-cost or estimated fair value, less costs to sell, on our Consolidated Balance Sheet.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	'
	Impairment of Long-lived Assets
	The carrying value of long-lived assets (including property and equipment) are evaluated for impairment whenever events or changes in circumstances indicate that their carrying values may not be recoverable from the estimated undiscounted future cash flows expected to result from their use and eventual disposition. Recoverability of assets to be held and used is measured by a comparison of their carrying amount to future net undiscounted cash flows expected to be generated by the assets. If these assets are considered to be impaired, the impairment is measured as the amount by which the carrying amount of the assets exceeds the fair value as estimated by discounted cash flows. No material impairment was recognized in 2013, 2012, or 2011.
	An impairment test on an asset group to be sold or otherwise disposed of is performed upon occurrence of a triggering event or when certain criteria are met (e.g., the asset is planned to be disposed of within twelve months, appropriate levels of authority have approved the sale, there is an active program to locate a buyer, etc.), which cause the disposal group to be classified as held-for-sale. Long-lived assets held-for-sale are recorded at the lower of their carrying amount or estimated fair value less cost to sell. If the carrying value of the assets held-for-sale exceeds the fair value less cost to sell, we recognize an impairment loss based on the excess of the carrying amount over the fair value of the assets less cost to sell. During 2013, 2012, and 2011, impairment losses were recognized on asset groups that were classified as held-for-sale or disposed of by sale. Refer to Note 2 for a discussion of discontinued and held-for-sale operations.
Property, Plant and Equipment, Policy [Policy Text Block]	'
	Property and Equipment
	Property and equipment stated at cost, net of accumulated depreciation and amortization, are reported in other assets on our Consolidated Balance Sheet. Included in property and equipment are certain buildings, furniture and fixtures, leasehold improvements, company vehicles, IT hardware and software, and capitalized software costs. Depreciation is computed on a straight-line basis over the estimated useful lives of the assets, which generally ranges from three to thirty years. Capitalized software is generally amortized on a straight-line basis over its useful life, which generally ranges from three to five years. Capitalized software that is not expected to provide substantive service potential or for which development costs significantly exceed the amount originally expected is considered impaired and written down to fair value. Software expenditures that are considered general, administrative, or of a maintenance nature are expensed as incurred.
Revenue Recognition, Deferred Revenue [Policy Text Block]	'
	Unearned Insurance Premiums and Service Revenue
	Insurance premiums, net of premiums ceded to reinsurers, and service revenue are earned over the terms of the policies. The portion of premiums and service revenue written applicable to the unexpired terms of the policies is recorded as unearned insurance premiums or unearned service revenue. For extended service and maintenance contracts, premiums and service revenues are earned on a basis proportionate to the anticipated cost emergence. For other short duration contracts, premiums and unearned service revenue are earned on a pro rata basis. For further information, refer to Note 3.
Deferred Charges, Policy [Policy Text Block]	'
	Deferred Policy Acquisition Costs
	Commissions, including compensation paid to sellers of vehicle service contracts and other costs of acquiring insurance that are primarily related to and vary with the production of business, are deferred and recorded in other assets. Deferred policy acquisition costs are amortized over the terms of the related policies and service contracts on the same basis as premiums and revenue are earned except for direct response advertising costs, which are amortized over their expected future benefit. We group costs incurred for acquiring like contracts and consider anticipated investment income in determining the recoverability of these costs.
Unpaid Policy Claims and Claims Adjustment Expense, Policy [Policy Text Block]	'
	Reserves for Insurance Losses and Loss Adjustment Expenses
	Reserves for insurance losses and loss adjustment expenses are reported in accrued expenses and other liabilities. They are established for the unpaid cost of insured events that have occurred as of a point in time. More specifically, the reserves for insurance losses and loss adjustment expenses represent the accumulation of estimates for both reported losses and those incurred, but not reported, including claims adjustment expenses relating to direct insurance and assumed reinsurance agreements. Estimates for salvage and subrogation recoverable are recognized at the time losses are incurred and netted against provision for insurance losses and loss adjustment expenses. Reserves are established for each business at the lowest meaningful level of homogeneous data. Since the reserves are based on estimates, the ultimate liability may vary from such estimates. The estimates are regularly reviewed and adjustments, which can potentially be significant, are included in earnings in the period in which they are deemed necessary.
Legal Costs, Policy [Policy Text Block]	'
	Legal and Regulatory Reserves
	Reserves for legal and regulatory matters are established when those matters present loss contingencies that are both probable and estimable, with a corresponding amount recorded to other noninterest expense. In cases where we have an accrual for losses, it is our policy to include an estimate for probable and estimable legal expenses related to the case. If, at the time of evaluation, the loss contingency related to a legal or regulatory matter is not both probable and estimable, we do not establish an accrued liability. We continue to monitor legal and regulatory matters for further developments that could affect the requirement to establish a liability or that may impact the amount of a previously established liability. There may be exposure to loss in excess of any amounts recognized. For certain other matters where the risk of loss is determined to be reasonably possible, estimable, and material to the financial statements, disclosure regarding details of the matter and an estimated range of loss is required. The estimated range of possible loss does not represent our maximum loss exposure. Financial statement disclosure is also required for matters that are deemed probable or reasonably possible, material to the financial statements, but for which an estimated range of loss is not possible to determine. While we believe our reserves are adequate, the outcome of legal and regulatory proceedings is extremely difficult to predict and we may settle claims or be subject to judgments for amounts that differ from our estimates. For information regarding the nature of all material contingencies, refer to Note 29.
Repurchase and Resale Agreements Policy [Policy Text Block]	'
	Loan Repurchase and Obligations Related to Loan Sales
	Our mortgage operations has sold consumer loans through securitization transactions involving the Federal National Mortgage Association (Fannie Mae), the Federal Home Loan Mortgage Corporation (Freddie Mac), and the Government National Mortgage Association (Ginnie Mae) (collectively, the Government-sponsored Enterprises, or GSEs) and via whole-loan transactions directly to third party investors. In connection with these activities we provide to the GSEs and third party investors various representations and warranties related to the loans sold. These representations and warranties generally relate to, among other things, the ownership of the loan, the validity of the lien securing the loan, the loan's compliance with the criteria for inclusion in the transaction, including compliance with underwriting standards or loan criteria established by the buyer, ability to deliver required documentation and compliance with applicable laws. Generally, the representations and warranties described in Note 29 may be enforced at any time over the life of the loan.
	Upon a breach of a representation, we correct the breach in a manner conforming to the provisions of the sale agreement. This may require us either to repurchase the loan or to indemnify (make-whole) a party for incurred losses or provide other recourse to a GSE or investor. Repurchase demands and claims for indemnification payments are reviewed on a loan-by-loan basis to validate if there has been a breach requiring repurchase or a make-whole payment. We actively contest claims to the extent we do not consider them valid. In cases where we repurchase loans, we bear the credit loss on the loans. Repurchased loans are classified as held-for-sale and initially recorded at fair value and subsequently at the lower of cost or market. We seek to manage the risk of repurchase and associated credit exposure through our underwriting and quality assurance practices and by servicing mortgage loans to meet investor standards.
	The reserve for representation and warranty obligations reflects management's best estimate of probable lifetime loss. We consider historical and recent demand trends in establishing the reserve. The methodology used to estimate the reserve considers a variety of assumptions including borrower performance (both actual and estimated future defaults), repurchase demand behavior, historical loan defect experience, historical and estimated future loss experience, which includes projections of future home price changes as well as other qualitative factors including investor behavior. In cases where we may not be able to reasonably estimate losses, a liability is not recognized. Management monitors the adequacy of the overall reserve and makes adjustments to the level of reserve, as necessary, after consideration of other qualitative factors including ongoing dialogue with counterparties.
	At the time a loan is sold, an estimate of the fair value of the liability is recorded and classified in other liabilities on our Consolidated Balance Sheet, and recorded as a component of gain (loss) on mortgage and automotive loans, net, in our Consolidated Statement of Income. We recognize changes in the reserve when additional relevant information becomes available. Changes in the liability are recorded as other operating expenses in our Consolidated Statement of Income.
Earnings Per Share, Policy [Policy Text Block]	'
	Earnings per Common Share
	We compute basic earnings (loss) per common share by dividing net income (loss) from continuing operations attributable to common shareholders after deducting dividends on preferred stock by the weighted-average number of common shares outstanding during the period. We compute diluted earnings (loss) per common share by dividing net income (loss) from continuing operations after deducting dividends on preferred stock by the weighted-average number of common shares outstanding during the period plus the dilution resulting from the conversion of convertible preferred stock, if applicable.
Derivatives, Policy [Policy Text Block]	'
	Derivative Instruments and Hedging Activities
	We primarily use derivative instruments for risk management purposes. Some of our derivative instruments are designated in qualifying hedge accounting relationships; other derivative instruments do not qualify for hedge accounting or are not elected to be designated in a qualifying hedging relationship. In accordance with applicable accounting standards, all derivative financial instruments, whether designated for hedge accounting or not, are required to be recorded on the balance sheet as assets or liabilities and measured at fair value. Additionally, we report derivative financial instruments on the Consolidated Balance Sheet primarily on a gross basis. For additional information on derivative instruments and hedging activities, refer to Note 21.
	At inception of a hedge accounting relationship, we designate each qualifying derivative financial instrument as a hedge of the fair value of a specifically identified asset or liability (fair value hedge); as a hedge of the variability of cash flows to be received or paid related to a recognized asset or liability (cash flow hedge); or as a hedge of the foreign-currency exposure of a net investment in a foreign operation. We formally document all relationships between hedging instruments and hedged items and risk management objectives for undertaking various hedge transactions. Both at the hedge's inception and on an ongoing basis, we formally assess whether the derivatives that are used in hedging relationships are highly effective in offsetting changes in fair values or cash flows of hedged items.
	Changes in the fair value of derivative financial instruments that are designated and qualify as fair value hedges along with the gain or loss on the hedged asset or liability attributable to the hedged risk, are recorded in the current period earnings. For qualifying cash flow hedges, the effective portion of the change in the fair value of the derivative financial instruments is recorded in accumulated other comprehensive income, and recognized in the income statement when the hedged cash flows affect earnings. For a derivative designated as hedging the foreign-currency exposure of a net investment in a foreign operation, the gain or loss is reported in accumulated other comprehensive income as part of the cumulative translation adjustment. The ineffective portions of fair value, cash flow, and net investment hedges are immediately recognized in earnings, along with the portion of the change in fair value that is excluded from the assessment of hedge effectiveness, if any.
	The hedge accounting treatment described herein is no longer applied if a derivative financial instrument is terminated or the hedge designation is removed or is assessed to be no longer highly effective. For these terminated fair value hedges, any changes to the hedged asset or liability remain as part of the basis of the asset or liability and are recognized into income over the remaining life of the asset or liability. For terminated cash flow hedges, unless it is probable that the forecasted cash flows will not occur within a specified period, any changes in fair value of the derivative financial instrument previously recognized remain in accumulated other comprehensive income, and are reclassified into earnings in the same period that the hedged cash flows affect earnings. The previously recognized net derivative gain or loss for a net investment hedge continues to remain in accumulated other comprehensive income until earnings are impacted by sale or liquidation of the associated foreign operation. In all instances, after hedge accounting is no longer applied, any subsequent changes in fair value of the derivative instrument will be recorded into earnings.
	Changes in the fair value of derivative financial instruments held for risk management purposes that are not designated for hedge accounting under GAAP are reported in current period earnings.
Income Tax, Policy [Policy Text Block]	'
	Income Taxes
	Our income tax expense, deferred tax assets and liabilities, and reserves for unrecognized tax benefits reflect management's best assessment of estimated future taxes to be paid. We are subject to income taxes in the United States and numerous foreign jurisdictions. Significant judgments and estimates are required in determining the consolidated income tax expense.
	Deferred income taxes arise from temporary differences between the tax and financial statement recognition of revenue and expense. In evaluating our ability to recover our deferred tax assets within the jurisdiction from which they arise we consider all available positive and negative evidence including scheduled reversals of deferred tax liabilities, projected future taxable income, tax planning strategies and recent financial operations. In projecting future taxable income, we begin with historical results adjusted for the results of discontinued operations and changes in accounting policies and incorporate assumptions including the amount of future state, federal and foreign pretax operating income, the reversal of temporary differences, and the implementation of feasible and prudent tax planning strategies. For additional information regarding our provision for income taxes, refer to Note 22.
	We recognize the financial statement effects of uncertain income tax positions when it is more likely than not, based on the technical merits, that the position will be sustained upon examination. Also, we recognize accrued interest and penalties related to uncertain income tax positions in interest expense and other operating expenses, respectively.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	'
	Share-based Compensation
	Under accounting guidance for share-based compensation, compensation cost recognized includes cost for share-based awards. For certain share-based awards compensation cost is ratably charged to expense over the applicable service periods. For other share-based awards, the awards require liability treatment and are remeasured quarterly at fair value, as determined by the Board of Directors, until they are paid, with changes in fair value charged to compensation expense in the period in which the change occurs. Refer to Note 23 for a discussion of our share-based compensation plans.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	'
	Foreign Exchange
	Foreign-denominated assets and liabilities resulting from foreign-currency transactions are valued using period-end foreign-exchange rates and the results of operations and cash flows are determined using approximate weighted average exchange rates for the period. Translation adjustments are related to foreign subsidiaries using local currency as their functional currency and are reported as a separate component of accumulated other comprehensive income. We may elect to enter into foreign-currency derivatives to mitigate our exposure to changes in foreign-exchange rates. Refer to Derivative Instruments and Hedging Activities above for a discussion of our hedging activities of the foreign-currency exposure of a net investment in a foreign operation.
Discontinued Operations, Policy [Policy Text Block]	'
	We classify operations as discontinued when operations and cash flows will be eliminated from our ongoing operations and we do not expect to retain any significant continuing involvement in their operations after the respective sale transactions. For all periods presented, the operating results for these discontinued operations have been removed from continuing operations and presented separately as discontinued operations, net of tax, in the Consolidated Statement of Income. The Notes to the Consolidated Financial Statements have been adjusted to exclude discontinued operations unless otherwise noted.

Discontinued_and_Heldforsale_O1

Discontinued and Held-for-sale Operations (Tables)	12 Months Ended
	Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]	'
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	'
	The assets and liabilities of operations held-for-sale are summarized below.
	December 31, ($ in millions)		Select				Select			Total
			Insurance				Automotive Finance			held-for-sale
			operations (a)				operations (b)			operations
	2013
	Assets
	Other assets		$	—			$	516		$	516
	Total assets		$	—			$	516		$	516
	2012
	Assets
	Cash and cash equivalents
	Noninterest-bearing		$	8			$	100		$	108
	Interest-bearing		119				1,918			2,037
	Total cash and cash equivalents		127				2,018			2,145
	Investment securities		576				424			1,000
	Finance receivables and loans, net
	Finance receivables and loans, net of unearned income		—				25,835			25,835
	Allowance for loan losses		—				(208		)	(208		)
	Total finance receivables and loans, net		—				25,627			25,627
	Investment in operating leases, net		—				144			144
	Premiums receivable and other insurance assets		277				—			277
	Other assets		94				2,942			3,036
	Impairment on assets of held-for-sale operations		(53		)		—			(53		)
	Total assets		$	1,021			$	31,155		$	32,176
	Liabilities
	Interest-bearing deposit liabilities		$	—			$	3,907		$	3,907
	Short-term borrowings		—				2,800			2,800
	Long-term debt		—				13,514			13,514
	Interest payable		—				177			177
	Unearned insurance premiums and service revenue		506				—			506
	Accrued expenses and other liabilities		297				1,498			1,795
	Total liabilities		$	803			$	21,896		$	22,699
	(a)	Includes our U.K.-based operations that provide vehicle service contracts and insurance products, and ABA Seguros.
	(b)	Includes our Canadian operations sold to Royal Bank of Canada and international entities being sold to GM Financial.
	Select financial information of discontinued operations is summarized below. The pretax income or loss, including direct costs to transact a sale, includes any impairment recognized to present the operations at the lower-of-cost or fair value. Fair value was based on the estimated sales price, which could differ from the ultimate sales price due to price volatility, changing interest rates, changing foreign-currency rates, and future economic conditions.
	Year ended December 31, ($ in millions)		2013				2012			2011
	Select Mortgage operations
	Total net revenue		$	—			$	439		$	562
	Pretax loss including direct costs to transact a sale (a) (b)		(1,741		)		(1,282		)	(811		)
	Tax (benefit) expense (c)		(592		)		(443		)	2
	Select Insurance operations
	Total net revenue		$	190			$	625		$	710
	Pretax income including direct costs to transact a sale (a)		319			(d)	86			145
	Tax (benefit) expense (c)		(14		)		53			39
	Select Automotive Finance operations
	Total net revenue		$	572			$	1,503		$	1,690
	Pretax income including direct costs to transact a sale (a)		660			(e)	786			820
	Tax (benefit) expense (c)		(101		)		235			92
	Select Corporate and Other operations
	Total net revenue		$	—			$	11		$	7
	Pretax income		—				83			44
	Tax expense		—				2			3
	(a)	Includes certain treasury and other corporate activity recognized by Corporate and Other.
	(b)	Includes the results of ResCap. Refer to Note 1 for more information regarding the Debtors' bankruptcy.
	(c)	Includes certain income tax activity recognized by Corporate and Other.
	(d)	Includes recognized pretax gain of $274 million in connection with the sale of our Mexican insurance business, ABA Seguros.
	(e)	Includes recognized pretax loss of $488 million in connection with the sale of our European and Latin American automotive finance operations and pretax gain of $888 million in connection with the sale of our Canadian automotive finance operations, Ally Credit Canada Limited and ResMor Trust.

Insurance_Premiums_and_Service1

Insurance Premiums and Service Revenue Earned (Tables)	12 Months Ended
	Dec. 31, 2013
Premiums Written and Earned [Abstract]	'
Insurance Premiums and Service Revenue Earned [Table Text Block]	'
	The following table is a summary of insurance premiums and service revenue written and earned.
		2013						2012						2011
	Year ended December 31, ($ in millions)	Written			Earned			Written			Earned			Written			Earned
	Insurance premiums
	Direct	$	270		$	305		$	332		$	335		$	342		$	309
	Assumed	61			58			44			49			38			76
	Gross insurance premiums	331			363			376			384			380			385
	Ceded	(172		)	(120		)	(141		)	(109		)	(129		)	(126		)
	Net insurance premiums	159			243			235			275			251			259
	Service revenue	838			769			826			780			788			894
	Insurance premiums and service revenue written and earned	$	997		$	1,012		$	1,061		$	1,055		$	1,039		$	1,153

Other_Income_Net_Of_Losses_Tab

Other Income, Net Of Losses (Tables)	12 Months Ended
	Dec. 31, 2013
Other Nonoperating Income (Expense) [Abstract]	'
Schedule of Other Nonoperating Income, by Component [Table Text Block]	'
	Details of other income, net of losses, were as follows.
	Year ended December 31, ($ in millions)	2013		2012			2011
	Late charges and other administrative fees	$	94	$	83		$	82
	Remarketing fees	82		63			96
	Mortgage processing fees and other mortgage income	81		475			236
	Fair value adjustment on derivatives (a)	24		(30		)	(125		)
	Securitization income	23		45			199
	Other, net	79		101			133
	Total other income, net of losses	$	383	$	737		$	621
	(a)	Refer to Note 21 for a description of derivative instruments and hedging activities.

Other_Operating_Expenses_Table

Other Operating Expenses (Tables)	12 Months Ended
	Dec. 31, 2013
Operating Expenses [Abstract]	'
Schedule of Other Operating Cost and Expense, by Component [Table Text Block]	'
	Details of other operating expenses were as follows.
	Year ended December 31, ($ in millions)	2013		2012		2011
	Insurance commissions	$	370	$	382	$	431
	Technology and communications	346		317		342
	Professional services	176		149		171
	Lease and loan administration	173		325		201
	Advertising and marketing	136		145		150
	Regulatory and licensing fees	116		118		124
	Provision for legal and regulatory settlements (a)	105		6		2
	Mortgage representation and warranty obligation, net	104		171		—
	Premises and equipment depreciation	81		76		70
	Vehicle remarketing and repossession	60		52		84
	Occupancy	44		50		47
	Other	270		271		361
	Total other operating expenses	$	1,981	$	2,062	$	1,983
	(a)	Results for the year ended December 31, 2013 include a $98 million settlement charge related to Consent Orders issued by the Consumer Financial Protection Bureau (CFPB) and the U.S. Department of Justice (DOJ) pertaining to the allegation of disparate impact in the automotive finance business. Refer to Note 29 for additional details.

Investment_Securities_Tables

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2013
Available-for-sale Securities [Abstract]	'
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]	'
	Our portfolio of securities includes bonds, equity securities, asset- and mortgage-backed securities, interests in securitization trusts, and other investments. The cost, fair value, and gross unrealized gains and losses on available-for-sale securities were as follows.
			2013															2012
			Amortized cost			Gross unrealized								Fair				Amortized cost				Gross unrealized						Fair
	December 31, ($ in millions)					gains				losses				value								gains			losses			value
	Available-for-sale securities
	Debt securities
	U.S. Treasury and federal agencies		$	1,495		$	1			$	(69	)		$	1,427			$	2,212			$	3		$	(1	)	$	2,214
	U.S. States and political subdivisions		316			—				(1		)		315				—				—			—			—
	Foreign government		287			4				(3		)		288				295				8			—			303
	Mortgage-backed residential (a)		11,131			49				(398		)		10,782				6,779				130			(3		)	6,906
	Mortgage-backed commercial		39			—				—				39				—				—			—			—
	Asset-backed		2,207			15				(3		)		2,219				2,309				32			(1		)	2,340
	Corporate debt		1,052			23				(6		)		1,069				1,209				57			(3		)	1,263
	Total debt securities		16,527			92				(480		)		16,139				12,804				230			(8		)	13,026
	Equity securities		898			74				(28		)		944				1,193				32			(73		)	1,152
	Total available-for-sale securities (b)		$	17,425		$	166			$	(508	)		$	17,083			$	13,997			$	262		$	(81	)	$	14,178
	(a)	Residential mortgage-backed securities include agency-backed bonds totaling $8,266 million and $4,983 million at December 31, 2013, and December 31, 2012, respectively.
	(b)	Certain entities related to our Insurance operations are required to deposit securities with state regulatory authorities. These deposited securities totaled $15 million and $15 million at December 31, 2013, and December 31, 2012, respectively.
Investments Classified by Contractual Maturity Date [Table Text Block]	'
	The maturity distribution of available-for-sale debt securities outstanding is summarized in the following tables. Prepayments may cause actual maturities to differ from scheduled maturities.
			Total						Due in							Due after							Due after					Due after
									one year							one year							five years					ten years (a)
									or less							through							through
																five years							ten years
	($ in millions)		Amount			Yield			Amount				Yield			Amount				Yield			Amount			Yield		Amount			Yield
	December 31, 2013
	Fair value of available-for-sale debt securities (b)
	U.S. Treasury and federal agencies		$	1,427		1.3	%		$	9			3	%		$	766			1.2	%		$	652		1.3	%	$	—		—	%
	U.S. States and political subdivisions		315			3.3			39				1.3			10				0.6			102			2.6		164			4.3
	Foreign government		288			2.7			18				2.7			105				2.4			164			2.9		1			2.7
	Mortgage-backed residential		10,782			2.7			—				—			90				2.1			3			4.2		10,689			2.7
	Mortgage-backed commercial		39			1.3			—				—			—				—			—			—		39			1.3
	Asset-backed		2,219			2			76				2.4			1,483				1.9			491			1.9		169			2.7
	Corporate debt		1,069			4.1			24				3.4			547				3			430			5.3		68			5.7
	Total available-for-sale debt securities		$	16,139		2.5			$	166			2.3			$	3,001			1.9			$	1,842		2.5		$	11,130		2.7
	Amortized cost of available-for-sale debt securities		$	16,527					$	165						$	3,000						$	1,882				$	11,480
	December 31, 2012
	Fair value of available-for-sale debt securities (b)
	U.S. Treasury and federal agencies		$	2,214		0.9	%		$	422			—	%		$	682			0.7	%		$	1,110		1.4	%	$	—		—	%
	Foreign government		303			2.5			1				2.2			136				1.8			166			3		—			—
	Mortgage-backed residential		6,906			2.7			—				—			—				—			35			4.3		6,871			2.7
	Asset-backed		2,340			2.1			—				—			1,543				2			510			1.7		287			3.3
	Corporate debt		1,263			5.1			9				3.2			560				4			596			6		98			5.8
	Total available-for-sale debt securities		$	13,026		2.4			$	432			0.1			$	2,921			2			$	2,417		2.6		$	7,256		2.6
	Amortized cost of available-for-sale debt securities		$	12,804					$	431						$	2,880						$	2,369				$	7,124
	(a)	Investments with no stated maturities are included as contractual maturities of greater than 10 years. Actual maturities may differ due to call or prepayment options.
	(b)	Yields on tax-exempt obligations are computed on a tax-equivalent basis.
Schedule of Realized Gain (Loss) [Table Text Block]	'
	The following table presents gross gains and losses realized upon the sales of available-for-sale securities and other-than-temporary impairment.
	Year ended December 31, ($ in millions)	2013			2012				2011
	Gross realized gains	$	221		$	241			$	297
	Gross realized losses	(21		)	(34		)		(28		)
	Other-than-temporary impairment	(20		)	(61		)		(11		)
	Other gain on investments, net	$	180		$	146			$	258
Investment Income [Table Text Block]	'
	The following table presents interest and dividends on available-for-sale securities.
	Year ended December 31, ($ in millions)	2013			2012				2011
	Taxable interest	$	297		$	262			$	325
	Taxable dividends	25			30				25
	Interest and dividends exempt from U.S. federal income tax	3			—				—
	Interest and dividends on available-for-sale securities	$	325		$	292			$	350
Schedule of Unrealized Loss on Investments [Table Text Block]	'
	Certain available-for-sale securities were sold at a loss in 2013, 2012, and 2011 as a result of market conditions within these respective periods (e.g., a downgrade in the rating of a debt security). The table below summarizes available-for-sale securities in an unrealized loss position in accumulated other comprehensive income. Based on the methodology described below that was applied to these securities, we believe that the unrealized losses relate to factors other than credit losses in the current market environment. As of December 31, 2013, we did not have the intent to sell the debt securities with an unrealized loss position in accumulated other comprehensive income, and it is not more likely than not that we will be required to sell these securities before recovery of their amortized cost basis. As of December 31, 2013, we had the ability and intent to hold equity securities with an unrealized loss position in accumulated other comprehensive income, and it is not more likely than not that we will be required to sell these securities before recovery of their amortized cost basis. As a result, we believe that the securities with an unrealized loss position in accumulated other comprehensive income are not considered to be other-than-temporarily impaired at December 31, 2013. Refer to Note 1 for additional information related to investment securities and our methodology for evaluating potential other-than-temporary impairments.
			2013															2012
			Less than							12 months								Less than							12 months
			12 months							or longer								12 months							or longer
	December 31, ($ in millions)		Fair			Unrealized				Fair				Unrealized				Fair				Unrealized			Fair			Unrealized
			value			loss				value				loss				value				loss			value			loss
	Available-for-sale securities
	Debt securities
	U.S. Treasury and federal agencies		$	1,405		$	(69	)		$	—			$	—			$	244			$	(1	)	$	—		$	—
	U.S. States and political subdivisions		212			(1		)		—				—				—				—			—			—
	Foreign government		114			(3		)		—				—				11				—			—			—
	Mortgage-backed		7,503			(388		)		100				(10		)		493				(2		)	23			(1		)
	Asset-backed		407			(3		)		1				—				143				(1		)	1			—
	Corporate debt		310			(6		)		3				—				120				(2		)	15			(1		)
	Total temporarily impaired debt securities		9,951			(470		)		104				(10		)		1,011				(6		)	39			(2		)
	Temporarily impaired equity securities		167			(12		)		100				(16		)		380				(39		)	218			(34		)
	Total temporarily impaired available-for-sale securities		$	10,118		$	(482	)		$	204			$	(26	)		$	1,391			$	(45	)	$	257		$	(36	)

Finance_Receivables_And_Loans_1

Finance Receivables And Loans, Net (Tables)	12 Months Ended
	Dec. 31, 2013
Loans and Leases Receivable, Net Reported Amount, by Category Alternative [Abstract]	'
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	'
	The composition of finance receivables and loans, net, reported at carrying value before allowance for loan losses was as follows.
	December 31, ($ in millions)		2013				2012
	Consumer automobile (a)		$	56,417			$	53,715
	Consumer mortgage (b) (c)		8,444				9,821
	Commercial
	Commercial and industrial
	Automobile		30,948				30,270
	Mortgage		—				—
	Other		1,664				2,697
	Commercial real estate - Automobile		2,855				2,552
	Total commercial		35,467				35,519
	Total finance receivables and loans (d)		$	100,328			$	99,055
	(a)	Includes $1 million of fair value adjustment for loans in hedge accounting relationships at December 31, 2013. Refer to Note 21 for additional information.
	(b)	Includes interest-only mortgage loans of $1.5 billion and $2.1 billion at December 31, 2013, and December 31, 2012, respectively, the majority of which are expected to start principal amortization in 2015 or beyond.
	(c)	Includes domestic consumer mortgages at a fair value of $1 million at December 31, 2013, as a result of fair value option election.
	(d)	Totals are net of unearned income, unamortized premiums and discounts, and deferred fees and costs of $595 million and $895 million at December 31, 2013, and December 31, 2012, respectively.
Allowance for Credit Losses on Financing Receivables [Table Text Block]	'
	($ in millions)		Consumer				Consumer				Commercial				Total
			automobile				mortgage
	Allowance at January 1, 2012		$	766			$	516			$	221			$	1,503
	Charge-offs		(616		)		(149		)		(11		)		(776		)
	Recoveries		247				11				44				302
	Net charge-offs		(369		)		(138		)		33				(474		)
	Provision for loan losses		257				86				(14		)		329
	Other (a)		(79		)		(12		)		(97		)		(188		)
	Allowance at December 31, 2012		$	575			$	452			$	143			$	1,170
	Allowance for loan losses
	Individually evaluated for impairment		$	16			$	186			$	26			$	228
	Collectively evaluated for impairment		556				266				117				939
	Loans acquired with deteriorated credit quality		3				—				—				3
	Finance receivables and loans at historical cost
	Ending balance		53,715				9,821				35,519				99,055
	Individually evaluated for impairment		260				873				1,538				2,671
	Collectively evaluated for impairment		53,425				8,948				33,981				96,354
	Loans acquired with deteriorated credit quality		30				—				—				30
	(a)	Includes provision for loan losses relating to discontinued operations of $65 million.
	The following tables present an analysis of the activity in the allowance for loan losses on finance receivables and loans.
	($ in millions)		Consumer				Consumer				Commercial				Total
			automobile				mortgage
	Allowance at January 1, 2013		$	575			$	452			$	143			$	1,170
	Charge-offs		(639		)		(93		)		(5		)		(737		)
	Recoveries		237				18				10				265
	Net charge-offs		(402		)		(75		)		5				(472		)
	Provision for loan losses		490				13				(2		)		501
	Other		10				(1		)		—				9
	Allowance at December 31, 2013		$	673			$	389			$	146			$	1,208
	Allowance for loan losses
	Individually evaluated for impairment		$	23			$	199			$	26			$	248
	Collectively evaluated for impairment		650				190				120				960
	Loans acquired with deteriorated credit quality		—				—				—				—
	Finance receivables and loans at historical cost
	Ending balance		56,417				8,443				35,467				100,327
	Individually evaluated for impairment		281				919				204				1,404
	Collectively evaluated for impairment		56,128				7,524				35,263				98,915
	Loans acquired with deteriorated credit quality		8				—				—				8
Schedule Of Sales Of Financing Receivables And Loans [Table Text Block]	'
	The following table presents information about significant sales of finance receivables and loans recorded at historical cost and transfers of finance receivables and loans from held-for-investment to held-for-sale.
	December 31, ($ in millions)		2013				2012
	Consumer automobile		$	—			$	1,960
	Consumer mortgage		—				40
	Commercial		65				96
	Total sales and transfers		$	65			$	2,096
Past Due Financing Receivables [Table Text Block]	'
	The following table presents an analysis of our past due finance receivables and loans, net, recorded at historical cost reported at carrying value before allowance for loan losses.
	December 31, ($ in millions)		30-59 days				60-89 days				90 days				Total				Current				Total finance
			past due				past due				or more				past due								receivables and loans
											past due
	2013
	Consumer automobile		$	1,145			$	255			$	157			$	1,557			$	54,860			$	56,417
	Consumer mortgage		82				31				124				237				8,206				8,443
	Commercial
	Commercial and industrial
	Automobile		—				—				36				36				30,912				30,948
	Mortgage		—				—				—				—				—				—
	Other		—				—				—				—				1,664				1,664
	Commercial real estate - Automobile		—				—				6				6				2,849				2,855
	Total commercial		—				—				42				42				35,425				35,467
	Total consumer and commercial		$	1,227			$	286			$	323			$	1,836			$	98,491			$	100,327
	2012
	Consumer automobile		$	920			$	213			$	138			$	1,271			$	52,444			$	53,715
	Consumer mortgage		81				43				174				298				9,523				9,821
	Commercial
	Commercial and industrial
	Automobile		—				—				16				16				30,254				30,270
	Mortgage		—				—				—				—				—				—
	Other		—				—				1				1				2,696				2,697
	Commercial real estate - Automobile		—				—				8				8				2,544				2,552
	Total commercial		—				—				25				25				35,494				35,519
	Total consumer and commercial		$	1,001			$	256			$	337			$	1,594			$	97,461			$	99,055
Schedule of Financing Receivables, Non Accrual Status [Table Text Block]	'
	The following table presents the carrying value before allowance for loan losses of our finance receivables and loans recorded at historical cost on nonaccrual status.
	December 31, ($ in millions)		2013				2012
	Consumer automobile		$	329			$	260
	Consumer mortgage		192				382
	Commercial
	Commercial and industrial
	Automobile		116				146
	Mortgage		—				—
	Other		74				33
	Commercial real estate - Automobile		14				37
	Total commercial		204				216
	Total consumer and commercial finance receivables and loans		$	725			$	858
Financing Receivable Credit Quality Indicators [Table Text Block]	'
	The following table presents performing and nonperforming credit quality indicators in accordance with our internal accounting policies for our consumer finance receivables and loans recorded at historical cost reported at carrying value before allowance for loan losses. Nonperforming loans include finance receivables and loans on nonaccrual status when the principal or interest has been delinquent for 90 days or when full collection is determined not to be probable. Refer to Note 1 for additional information.
			2013												2012
	December 31, ($ in millions)		Performing				Nonperforming				Total				Performing				Nonperforming				Total
	Consumer automobile		$	56,088			$	329			$	56,417			$	53,455			$	260			$	53,715
	Consumer mortgage		8,251				192				8,443				9,439				382				9,821
	The following table presents pass and criticized credit quality indicators based on regulatory definitions for our commercial finance receivables and loans recorded at historical cost reported at carrying value before allowance for loan losses.
			2013												2012
	December 31, ($ in millions)		Pass				Criticized (a)				Total				Pass				Criticized (a)				Total
	Commercial
	Commercial and industrial
	Automobile		$	29,194			$	1,754			$	30,948			$	28,978			$	1,292			$	30,270
	Mortgage		—				—				—				—				—				—
	Other		1,388				276				1,664				2,417				280				2,697
	Commercial real estate - Automobile		2,770				85				2,855				2,440				112				2,552
	Total commercial		$	33,352			$	2,115			$	35,467			$	33,835			$	1,684			$	35,519
	(a)	Includes loans classified as special mention, substandard, or doubtful. These classifications are based on regulatory definitions and generally represent loans within our portfolio that have a higher default risk or have already defaulted.
Impaired Financing Receivables [Table Text Block]	'
	The following table presents information about our impaired finance receivables and loans recorded at historical cost.
	December 31, ($ in millions)		Unpaid principal balance				Carrying value before allowance				Impaired with no allowance				Impaired with an allowance				Allowance for impaired loans
	2013
	Consumer automobile		$	281			$	281			$	—			$	281			$	23
	Consumer mortgage		924				919				128				791				199
	Commercial
	Commercial and industrial
	Automobile		116				116				57				59				7
	Mortgage		—				—				—				—				—
	Other		74				74				—				74				16
	Commercial real estate - Automobile		14				14				9				5				3
	Total commercial		204				204				66				138				26
	Total consumer and commercial finance receivables and loans		$	1,409			$	1,404			$	194			$	1,210			$	248
	2012
	Consumer automobile		$	260			$	260			$	90			$	170			$	16
	Consumer mortgage		958				873				124				749				186
	Commercial
	Commercial and industrial
	Automobile		146				146				54				92				7
	Mortgage		—				—				—				—				—
	Other		33				33				9				24				7
	Commercial real estate - Automobile		37				37				9				28				12
	Total commercial		216				216				72				144				26
	Total consumer and commercial finance receivables and loans		$	1,434			$	1,349			$	286			$	1,063			$	228
	The following tables present average balance and interest income for our impaired finance receivables and loans.
			2013								2012								2011
	Year ended December 31, ($ in millions)		Average				Interest				Average				Interest				Average				Interest
			balance				income				balance				income				balance				income
	Consumer automobile		$	278			$	18			$	131			$	12			$	35			$	2
	Consumer mortgage		908				29				693				28				553				22
	Commercial
	Commercial and industrial
	Automobile		152				6				178				8				303				19
	Mortgage		—				—				5				—				19				6
	Other		72				2				32				6				84				1
	Commercial real estate
	Automobile		29				1				64				1				126				7
	Mortgage		—				—				6				—				40				1
	Total commercial		253				9				285				15				572				34
	Total consumer and commercial finance receivables and loans		$	1,439			$	56			$	1,109			$	55			$	1,160			$	58
Troubled Debt Restructurings on Financing Receivables [Table Text Block]	'
	The following table presents information related to finance receivables and loans recorded at historical cost modified in connection with a TDR during the period.
			2013 (a)											2012 (a)
	Year ended December 31, ($ in millions)		Number of			Pre-modification				Post-modification				Number of			Pre-modification				Post-modification
			loans			carrying value before				carrying value before				loans			carrying value before				carrying value before
						allowance				allowance							allowance				allowance
	Consumer automobile		19,388			$	297			$	249			36,285			$	407			$	295
	Consumer mortgage		1,092			278				234				2,969			436				350
	Commercial
	Commercial and industrial
	Automobile		8			37				37				9			15				15
	Mortgage		—			—				—				—			—				—
	Other		4			80				78				—			—				—
	Commercial real estate - Automobile		5			20				20				8			14				13
	Total commercial		17			137				135				17			29				28
	Total consumer and commercial finance receivables and loans		20,497			$	712			$	618			39,271			$	872			$	673
	(a)	Due to recent industry practice, bankruptcy loans that have not been reaffirmed have been included within our TDR population beginning in the fourth quarter of 2012.
Finance receivables and loans redefaulted during the period [Table Text Block]	'
	The following table presents information about finance receivables and loans recorded at historical cost that have redefaulted during the reporting period and were within 12 months or less of being modified as a TDR. Redefault is when finance receivables and loans meet the requirements for evaluation under our charge-off policy (Refer to Note 1 for additional information) except for commercial finance receivables and loans, where redefault is defined as 90 days past due.
			2013 (a)											2012 (a)
	Year ended December 31, ($ in millions)		Number of			Carrying value				Charge-off amount				Number of			Carrying value				Charge-off amount
			loans			before allowance								loans			before allowance
	Consumer automobile		6,038			$	75			$	37			2,290			$	26			$	12
	Consumer mortgage		32			8				1				153			19				3
	Commercial
	Commercial and industrial - Automobile		—			—				—				4			3				—
	Commercial real estate - Automobile		—			—				—				3			3				—
	Total commercial		—			—				—				7			6				—
	Total consumer and commercial finance receivables and loans		6,070			$	83			$	38			2,450			$	51			$	15
	(a)	Due to recent industry practice, bankruptcy loans that have not been reaffirmed have been included within our TDR population beginning in the fourth quarter of 2012.
Consumer Concentration Risk [Table Text Block]	'
	The following table shows the percentage of total consumer finance receivables and loans recorded at historical cost reported at carrying value before allowance for loan losses by geographic region.
		2013 (a)						2012
	December 31,	Automobile			1st Mortgage and home equity			Automobile			1st Mortgage and home equity
	Texas	13.2	%		5.8	%		12.9	%		5.8	%
	California	5.8			29.5			5.6			29.2
	Florida	7			3.6			6.7			3.6
	Pennsylvania	5.3			1.7			5.2			1.6
	Illinois	4.4			4.4			4.3			4.8
	Michigan	4.4			3.9			5			4.1
	New York	4.3			1.9			4.6			2
	Georgia	4			2.1			3.7			1.9
	Ohio	4			0.7			4			0.8
	North Carolina	3.4			1.9			3.3			2
	Other United States	44.2			44.5			44.7			44.2
	Total consumer loans	100	%		100	%		100	%		100	%
	(a)	Presentation is in descending order as a percentage of total consumer finance receivables and loans at December 31, 2013.
Commercial Concentration Risk [Table Text Block]	'
	The commercial real estate portfolio consists of loans issued primarily to automotive dealers. The following table shows the percentage of total commercial real estate finance receivables and loans reported at carrying value before allowance for loan losses by geographic region.
	December 31,	2013			2012
	Geographic region
	Texas	13.2	%		13	%
	Florida	12.6			11.7
	Michigan	11.6			12.6
	California	9.2			9.3
	New York	4.5			4.9
	North Carolina	4.1			3.9
	Virginia	3.8			3.9
	Pennsylvania	3.3			3.3
	Georgia	3.1			3
	Illinois	2.5			1.8
	Other United States	32.1			32.6
	Total commercial real estate finance receivables and loans	100	%		100	%
Commercial Criticized Exposure [Table Text Block]	'
	Finance receivables and loans classified as special mention, substandard, or doubtful are deemed as criticized. These classifications are based on regulatory definitions and generally represent finance receivables and loans within our portfolio that have a higher default risk or have already defaulted. The following table presents the percentage of total commercial criticized finance receivables and loans reported at carrying value before allowance for loan losses by industry concentrations.
	December 31,	2013			2012
	Industry
	Automotive	91.4	%		85.7	%
	Electronics	3.4			1.2
	Services	2.5			4.9
	Other	2.7			8.2
	Total commercial criticized finance receivables and loans	100	%		100	%

Investment_In_Operating_Leases1

Investment In Operating Leases, Net (Tables)	12 Months Ended
	Dec. 31, 2013
Leases, Operating [Abstract]	'
Schedule of Property Subject to or Available for Operating Lease [Table Text Block]	'
	Investments in operating leases were as follows.
	December 31, ($ in millions)		2013				2012
	Vehicles and other equipment		$	21,125			$	16,009
	Accumulated depreciation		(3,445		)		(2,459		)
	Investment in operating leases, net		$	17,680			$	13,550
Depreciation Expense On Operating Lease Assets [Table Text Block]	'
	Depreciation expense on operating lease assets includes remarketing gains and losses recognized on the sale of operating lease assets. The following summarizes the components of depreciation expense on operating lease assets.
	Year ended December 31, ($ in millions)	2013				2012				2011
	Depreciation expense on operating lease assets (excluding remarketing gains)	$	2,327			$	1,515			$	1,158
	Remarketing gains	(332		)		(116		)		(217		)
	Depreciation expense on operating lease assets	$	1,995			$	1,399			$	941
Schedule of Operating Leases of Lessor [Table Text Block]	'
	The following table presents the future lease nonresidual rental payments due from customers for equipment on operating leases.
	Year ended December 31, ($ in millions)
	2014	$	2,942
	2015	1,890
	2016	733
	2017	22
	2018 and after	—
	Total	$	5,587

Securitizations_And_Variable_I1

Securitizations And Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2013
Securitizations And Variable Interest Entities [Abstract]	'
Schedule of Variable Interest Entities [Table Text Block]	'
	Our involvement with consolidated and nonconsolidated VIEs in which we hold variable interests is presented below.
	December 31, ($ in millions)		Consolidated				Assets of				Maximum exposure to
			involvement				nonconsolidated				loss in nonconsolidated
			with VIEs (a)				VIEs (a)				VIEs
	2013
	On-balance sheet variable interest entities
	Consumer automobile		$	19,072
	Commercial automobile		20,511
	Commercial other		564
	Off-balance sheet variable interest entities
	Consumer automobile		—				$	899			$	899		(b)
	Commercial other		(24		)	(c)	—			(d)	40
	Total		$	40,123			$	899			$	939
	2012
	On-balance sheet variable interest entities
	Consumer automobile		$	28,566
	Commercial automobile		23,139
	Commercial other		728
	Off-balance sheet variable interest entities
	Consumer automobile		—				$	1,495			$	1,495		(b)
	Consumer mortgage — other		—				—			(d)	12			(e)
	Commercial other		(28		)	(c)	—			(d)	85
	Total		$	52,405			$	1,495			$	1,592
	(a)	Asset values represent the current unpaid principal balance of outstanding consumer finance receivables and loans within the VIEs.
	(b)	Maximum exposure to loss represents the current unpaid principal balance of outstanding loans based on our customary representation and warranty provisions. This measure is based on the unlikely event that all of the loans have underwriting defects or other defects that trigger a representation and warranty provision and the collateral supporting the loans are worthless. This required disclosure is not an indication of our expected loss.
	(c)	Amounts classified as accrued expenses and other liabilities.
	(d)	Includes a VIE for which we have no management oversight and therefore we are not able to provide the total assets of the VIEs.
	(e)	Our maximum exposure to loss in this VIE is a component of servicer advances made that are allocated to the trust. The maximum exposure to loss presented represents the unlikely event that every loan underlying the excess servicing rights sold defaults, and we, as servicer, are required to advance the entire excess service fee to the trust for the contractually established period. This required disclosure is not an indication of our expected loss.
Schedule of On-balance Sheet Variable Interest Entities [Table Text Block]	'
	The consolidated VIEs included in the Consolidated Balance Sheet represent separate entities with which we are involved. The third-party investors in the obligations of consolidated VIEs have legal recourse only to the assets of the VIEs and do not have such recourse to us, except for the customary representation and warranty provisions or when we are the counterparty to certain derivative transactions involving the VIE. In addition, the cash flows from the assets are restricted only to pay such liabilities. Thus, our economic exposure to loss from outstanding third-party financing related to consolidated VIEs is significantly less than the carrying value of the consolidated VIE assets. All assets of consolidated VIEs, presented below based upon the legal transfer of the underlying assets in order to reflect legal ownership, are restricted for the benefit of the beneficial interest holders. Refer to Note 24 for discussion of the assets and liabilities for which the fair value option has been elected.
	December 31, ($ in millions)	2013				2012
	Assets
	Finance receivables and loans, net
	Consumer	$	13,291			$	13,671
	Commercial	18,974				17,839
	Allowance for loan losses	(174		)		(144		)
	Total finance receivables and loans, net	32,091				31,366
	Investment in operating leases, net	4,620				6,060
	Other assets	3,436				2,868
	Assets of operations held-for-sale	—				12,139
	Total assets	$	40,147			$	52,433
	Liabilities
	Short-term borrowings	$	250			$	400
	Long-term debt	24,147				26,461
	Interest payable	—				1
	Accrued expenses and other liabilities	43				16
	Liabilities of operations held-for-sale	—				9,686
	Total liabilities	$	24,440			$	36,564
Schedule Of Cash Flow Received And Paid To Nonconsolidated Securitization Entities [Table Text Block]	'
	The following table summarizes cash flows received and paid related to securitization entities, asset-backed financings, or other similar transfers of financial assets where the transfer is accounted for as a sale and we have a continuing involvement with the transferred assets (e.g., servicing) that were outstanding in 2013, 2012, and 2011. Additionally, this table contains information regarding cash flows received from and paid to nonconsolidated securitization entities that existed during each period.
	Year ended December 31, ($ in millions)		Consumer automobile				Consumer				Consumer mortgage
							mortgage GSEs				private-label
	2013
	Cash proceeds from transfers completed during the period		$	—			$	8,676			$	—
	Servicing fees		13				70				—
	Representations and warranties obligations		—				(66		)		—
	Other cash flows		—				70				—
	2012
	Cash proceeds from transfers completed during the period		$	1,979			$	32,796			$	5
	Cash flows received on retained interests in securitization entities		—				—				71
	Servicing fees		12				693				63
	Purchases of previously transferred financial assets		—				(876		)		(12		)
	Representations and warranties obligations		—				(108		)		(7		)
	Other cash flows		—				(96		)		255
	2011
	Cash proceeds from transfers completed during the period		$	—			$	59,815			$	722
	Cash flows received on retained interests in securitization entities		—				—				68
	Servicing fees		—				999				201
	Purchases of previously transferred financial assets		—				(2,537		)		(222		)
	Representations and warranties obligations		—				(143		)		(38		)
	Other cash flows		—				(13		)		187
Schedule of Quantitative Information and Net Credit Losses about Securitized and Other Financial Assets Managed Together [Table Text Block]	'
	The following tables represent on-balance sheet loans held-for-sale and finance receivable and loans, off-balance sheet securitizations, and whole-loan sales where we have continuing involvement. The table presents quantitative information about delinquencies and net credit losses.
			Total Amount								Amount 60 days or more past due						Net credit losses
	December 31, ($ in millions)		2013				2012				2013				2012		2013			2012
	On-balance sheet loans
	Consumer automobile		$	56,417			$	53,715			$	412			$	351	$	402		$	369
	Consumer mortgage		8,460				12,311				164				241		75			8
	Commercial automobile		33,803				32,822				42				24		2			(1		)
	Commercial mortgage		—				—				—				—		—			(1		)
	Commercial other		1,683				2,783				—				1		(7		)	(31		)
	Total on-balance sheet loans		100,363				101,631				618				617		472			344
	Off-balance sheet securitization entities
	Consumer automobile		899				1,495				3				4		3			2
	Consumer mortgage - GSEs (a)		—				119,384				—				1,892		n/m			n/m
	Total off-balance sheet securitization entities		899				120,879				3				1,896		3			2
	Whole-loan transactions (b)		2,848				6,756				69				129		6			16
	Total		$	104,110			$	229,266			$	690			$	2,642	$	481		$	362
	n/m =160;not meaningful
	(a)	Anticipated credit losses are not meaningful due to the GSE guarantees.
	(b)	Whole-loan transactions are not part of a securitization transaction, but represent consumer automobile and consumer mortgage pools of loans sold to third-party investors.

Servicing_Activities_Tables

Servicing Activities (Tables)	12 Months Ended
	Dec. 31, 2013
Servicing Activities [Abstract]	'
Schedule of Servicing Assets at Fair Value [Table Text Block]	'
	The following table summarizes past activity related to mortgage servicing rights (MSRs), which were carried at fair value. Management estimated fair value using our transaction data and other market data or, in periods when there were limited MSRs market transactions that were directly observable, internally developed discounted cash flow models (an income approach) were used to estimate the fair value. These internal valuation models estimated net cash flows based on internal operating assumptions that we believed 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 believed approximate yields required by investors in this asset.
	Year ended December 31, ($ in millions)		2013				2012 (a)
	Estimated fair value at January 1,		$	952			$	2,519
	Additions		60				240
	Sales (b)		(911		)		—
	Changes in fair value
	Due to changes in valuation inputs or assumptions used in the valuation model		(32		)		(282		)
	Other changes in fair value		(69		)		(395		)
	Deconsolidation of ResCap		—				(1,130		)
	Estimated fair value at December 31,		$	—			$	952
	(a)	Includes activities of our discontinued operations.
	(b)	Includes the sales of agency MSRs to Ocwen Financial Corp. (Ocwen) and Quicken Loans, Inc. (Quicken) on April 1, 2013 and April 16, 2013, respectively.
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)		December 31, 2013		December 31, 2012
	Weighted average life (in years)		n/a		4.6
	Weighted average prepayment speed		n/a		13.5		%
	Impact on fair value of 10% adverse change		n/a		$	(77	)
	Impact on fair value of 20% adverse change		n/a		(144		)
	Weighted average discount rate		n/a		7.7		%
	Impact on fair value of 10% adverse change		n/a		$	(10	)
	Impact on fair value of 20% adverse change		n/a		(19		)
	n/a =160;not applicable
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)	2013				2012				2011
	Change in estimated fair value of mortgage servicing rights	$	(101	)		$	(560	)		$	(793	)
	Change in fair value of derivative financial instruments	(112		)		556				359
	Servicing asset valuation and hedge activities, net	$	(213	)		$	(4	)		$	(434	)
Components Of Mortgage Servicing Fees [Table Text Block]	'
	The components of mortgage servicing fees were as follows.
	Year ended December 31, ($ in millions)	2013				2012				2011
	Contractual servicing fees, net of guarantee fees and including subservicing	$	62			$	281			$	344
	Late fees	2				7				9
	Ancillary fees	4				12				12
	Total mortgage servicing fees	$	68			$	300			$	365
Schedule Of Total Serviced Automobile Loans Outstanding [Table Text Block]	'
	The total serviced automobile finance loans and leases outstanding were as follows.
	December 31, ($ in millions)		2013				2012
	On-balance sheet automobile finance loans and leases
	Consumer automobile		$	56,417			$	53,715
	Commercial automobile		33,803				32,822
	Operating leases		17,680				13,550
	Operations held-for-sale		—				25,979
	Other		54				41
	Off-balance sheet automobile finance loans
	Loans sold to third-party investors
	Securitizations		887				1,474
	Whole-loan		2,748				6,541
	Total serviced automobile finance loans and leases		$	111,589			$	134,122

Premiums_Receivable_and_Other_1

Premiums Receivable and Other Insurance Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Premiums Receivable and Other Insurance Assets [Abstract]	'
Premiums Receivable and Other Insurance Assets [Table Text Block]	'
	Premiums receivable and other insurance assets consisted of the following.
	December 31, ($ in millions)	2013		2012
	Prepaid reinsurance premiums	$	288	$	236
	Reinsurance recoverable on unpaid losses	182		234
	Reinsurance recoverable on paid losses	13		40
	Premiums receivable	85		108
	Deferred policy acquisition costs	1,045		991
	Total premiums receivable and other insurance assets	$	1,613	$	1,609

Other_Assets_Tables

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Other Assets [Abstract]	'
Schedule of Other Assets [Table Text Block]	'
	The components of other assets were as follows.
	December 31, ($ in millions)		2013			2012
	Property and equipment at cost		$	709		$	693
	Accumulated depreciation		(474		)	(411		)
	Net property and equipment		235			282
	Restricted cash collections for securitization trusts (a)		3,664			2,983
	Deferred tax asset		2,040			1,190
	Cash reserve deposits held-for-securitization trusts (b)		402			442
	Fair value of derivative contracts in receivable position (c)		362			2,298
	Nonmarketable equity securities		337			303
	Collateral placed with counterparties		328			1,290
	Unamortized debt issuance costs		312			425
	Other accounts receivable		290			525
	Restricted cash and cash equivalents		205			889
	Other assets		1,414			1,281
	Total other assets		$	9,589		$	11,908
	(a)	Represents cash collection from customer payments on securitized receivables. These funds are distributed to investors as payments on the related secured debt.
	(b)	Represents credit enhancement in the form of cash reserves for various securitization transactions.
	(c)	For additional information on derivative instruments and hedging activities, refer to Note 21.

Deposit_Liabilities_Tables

Deposit Liabilities (Tables)	12 Months Ended
	Dec. 31, 2013
Deposits [Abstract]	'
Schedule of Deposit Liabilities [Table Text Block]	'
	Deposit liabilities consisted of the following.
	December 31, ($ in millions)		2013		2012
	Domestic deposits
	Noninterest-bearing deposits		$	60	$	1,977
	Interest-bearing deposits
	Savings and money market checking accounts		21,210		13,871
	Certificates of deposit		31,640		31,084
	Dealer deposits		440		983
	Total deposit liabilities		$	53,350	$	47,915
Schedule Of Maturities For Total Time Deposits Text Block [Table Text Block]	'
	The following table presents the scheduled maturity of total certificates of deposit.
	($ in millions)
	Due in 2014	$	15,483
	Due in 2015	8,709
	Due in 2016	4,275
	Due in 2017	2,142
	Due in 2018	1,031
	Total certificates of deposit	$	31,640

ShortTerm_Borrowings_Tables

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2013
Short-term Debt [Abstract]	'
Schedule of Short-term Debt [Table Text Block]	'
	The following table presents the composition of our short-term borrowings portfolio.
			2013							2012
	December 31, ($ in millions)		Unsecured		Secured (a)		Total			Unsecured		Secured (a)		Total
	Demand notes		$	3,225	$	—	$	3,225		$	3,094	$	—	$	3,094
	Bank loans and overdrafts		—		—		—			167		—		167
	Federal Home Loan Bank		—		3,570		3,570			—		3,800		3,800
	Securities sold under agreements to repurchase (b)		—		1,500		1,500			—		—		—
	Other (c)		—		250		250			—		400		400
	Total short-term borrowings		$	3,225	$	5,320	$	8,545		$	3,261	$	4,200	$	7,461
	Weighted average interest rate (d)						0.8		%					1		%
	(a)	Refer to Note 15 for further details on assets restricted as collateral for payment of the related debt.
	(b)	We periodically enter into term repurchase agreements, short-term borrowing arrangements in which we sell financial instruments to one or more investors while simultaneously committing to repurchase them at a specified future date, at the stated price plus accrued interest. The financial instruments sold under agreement to repurchase typically consist of U.S. government and agency securities.
	(c)	Other relates to secured borrowings at our Commercial Finance Group.
	(d)	Based on the debt outstanding and the interest rate at December 31 of each year.

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Long-term Debt, Unclassified [Abstract]	'
Schedule of Long-term Debt Instruments [Table Text Block]	'
	The following tables present the composition of our long-term debt portfolio.
	December 31, ($ in millions)	Amount				Interest		Weighted		Due date
						rate		average		range
								interest
								rate (a)
	2013
	Unsecured debt
	Fixed rate (b)	$	21,367
	Variable rate	2,755
	Trust preferred securities	2,624
	Fair value adjustment (c)	445
	Total unsecured debt	27,191				0.32 - 10.29%		6.28	%	2014 - 2049
	Secured debt
	Fixed rate	20,492
	Variable rate	21,782
	Total secured debt (d) (e)	42,274				0.40 - 4.59%		0.98	%	2014 - 2022
	Total long-term debt	$	69,465
	2012
	Unsecured debt
	Fixed rate (b)	$	27,588
	Variable rate	2,345
	Trust preferred securities	2,623
	Fair value adjustment (c)	1,094
	Total unsecured debt	33,650				0.38 - 10.29%		6.72	%	2013 - 2049
	Secured debt
	Fixed rate	20,076
	Variable rate	20,835
	Total secured debt (d) (e)	40,911				0.25 - 8.30%		1.1	%	2013 - 2021
	Total long-term debt	$	74,561
	(a)	Based on the debt outstanding and the interest rate at December 31 of each year.
	(b)	Includes subordinated debt of $271 million at December 31, 2013 and $251 million at December 31, 2012.
	(c)	Amount represents the hedge accounting adjustment of fixed-rate debt.
	(d)	Includes $24.1 billion and $26.5 billion of VIE secured debt outstanding at December 31, 2013 and 2012, respectively.
	(e)	Includes $15.1 billion and $13.5 billion of debt outstanding from the Automotive secured revolving credit facilities at December 31, 2013 and 2012, respectively
Long-term Debt Portfolio [Table Text Block]	'
			2013										2012
	December 31, ($ in millions)		Unsecured				Secured			Total			Unsecured			Secured			Total
	Long-term debt
	Due within one year		$	5,321			$	11,851		$	17,172		$	1,070		$	11,503		$	12,573
	Due after one year		21,425				30,423			51,848			31,486			29,408			60,894
	Fair value adjustment		445				—			445			1,094			—			1,094
	Total long-term debt		$	27,191			$	42,274		$	69,465		$	33,650		$	40,911		$	74,561
Scheduled Remaining Maturity of Long-term Debt [Table Text Block]	'
	The following table presents the scheduled remaining maturity of long-term debt, assuming no early redemptions will occur. The actual payment of secured debt may vary based on the payment activity of the related pledged assets.
	Year ended December 31,		2014				2015			2016			2017			2018			2019 and			Fair value		Total
	($ in millions)																		thereafter			adjustment
	Unsecured
	Long-term debt		$	5,511			$	5,163		$	1,934		$	3,527		$	1,278		$	10,922		$	445	$	28,780
	Original issue discount		(190		)		(59		)	(65		)	(77		)	(90		)	(1,108		)	—		(1,589		)
	Total unsecured		5,321				5,104			1,869			3,450			1,188			9,814			445		27,191
	Secured
	Long-term debt		11,851				13,819			7,861			5,211			2,256			1,276			—		42,274
	Total long-term debt		$	17,172			$	18,923		$	9,730		$	8,661		$	3,444		$	11,090		$	445	$	69,465
Pledged assets for the payment of the related secured borrowings and repurchase agreements [Table Text Block]	'
	The following summarizes assets restricted as collateral for the payment of the related debt obligation primarily arising from securitization transactions accounted for as secured borrowings and repurchase agreements.
			2013							2012
	December 31, ($ in millions)		Total				Ally Bank (a)			Total			Ally Bank (a)
	Investment securities		$	2,864			$	2,864		$	1,911		$	1,911
	Mortgage assets held-for-investment and lending receivables		8,524				8,524			9,866			9,866
	Consumer automobile finance receivables		32,947				12,332			29,557			14,833
	Commercial automobile finance receivables		21,249				21,249			19,606			19,606
	Investment in operating leases, net		5,810				3,190			6,058			1,691
	Other assets		563				—			999			272
	Total assets restricted as collateral (b)		$	71,957			$	48,159		$	67,997		$	48,179
	Secured debt (c)		$	47,594			$	27,818		$	45,111		$	29,162
	(a)	Ally Bank is a component of the total column.
	(b)	Ally Bank has an advance agreement with the Federal Home Loan Bank of Pittsburgh (FHLB) and had assets pledged to secure borrowings that were restricted as collateral to the FHLB totaling $12.7 billion and $12.6 billion at December 31, 2013, and 2012, respectively. These assets were composed primarily of consumer and commercial mortgage finance receivables and loans, net. Ally Bank has access to the Federal Reserve Bank Discount Window. Ally Bank had assets pledged and restricted as collateral to the Federal Reserve Bank totaling $3.2 billion and $1.9 billion at December 31, 2013, and 2012, respectively. These assets were composed of consumer mortgage finance receivables and loans, net; consumer automobile finance receivables and loans, net; and investment securities. Availability under these programs is only for the operations of Ally Bank and cannot be used to fund the operations or liabilities of Ally or its subsidiaries.
	(c)	Includes $5.3 billion and $4.2 billion of short-term borrowings at December 31, 2013, and 2012, respectively.
Schedule Of Committed Funding Facilities [Table Text Block]	'
			Outstanding							Unused capacity (a)						Total capacity
	December 31, ($ in millions)		2013				2012			2013			2012			2013			2012
	Bank funding
	Secured		$	2,750			$	3,800		$	250		$	4,700		$	3,000		$	8,500
	Parent funding
	Unsecured (b)		—				118			—			25			—			143
	Secured (c) (d) (e)		15,159				22,454			6,497			7,839			21,656			30,293
	Total Parent funding		15,159				22,572			6,497			7,864			21,656			30,436
	Shared capacity (f)		—				1,154			—			2,971			—			4,125
	Total committed facilities		$	17,909			$	27,526		$	6,747		$	15,535		$	24,656		$	43,061
	(a)	Funding from committed secured facilities is available on request in the event excess collateral resides in certain facilities or is available to the extent incremental collateral is available and contributed to the facilities.
	(b)	Total unsecured parent funding capacity represented committed funding for our discontinued international automobile financing business.
	(c)	Total secured parent funding capacity included committed funding for our discontinued international automobile financing business of $12.0 billion at December 31, 2012, with outstanding debt of $9.6 billion.
	(d)	Total unused capacity included $2.2 billion at December 31, 2012 from certain committed funding arrangements that were generally reliant upon the origination of future automotive receivables available in 2013.
	(e)	Includes the secured facilities of our Commercial Finance Group.
	(f)	Funding was generally available for assets originated by Ally Bank or the parent company, Ally Financial Inc. Total shared facilities included committed funding for our discontinued international automobile financing business of $0.1 billion as of December 31, 2012, with outstanding debt of $0.1 billion.

Accrued_Expenses_and_Other_Lia1

Accrued Expenses and Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2013
Accounts Payable and Accrued Liabilities [Abstract]	'
Schedule of Accrued Liabilities [Table Text Block]	'
	The components of accrued expenses and other liabilities were as follows.
	December 31, ($ in millions)		2013		2012
	Employee compensation and benefits		$	437	$	494
	Accounts payable		414		565
	Fair value of derivative contracts in payable position (a)		317		2,468
	Reserves for insurance losses and loss adjustment expenses		275		341
	Collateral received from counterparties		159		941
	Deferred revenue		122		97
	Accrual related to ResCap Bankruptcy and deconsolidation (b)		—		750
	Other liabilities (c)		673		929
	Total accrued expenses and other liabilities		$	2,397	$	6,585
	(a)	For additional information on derivative instruments and hedging activities, refer to Note 21.
	(b)	Refer to Note 1 for more information regarding the Debtors' bankruptcy.
	(c)	Includes $150 million and $0 accrual for insurance proceeds to be contributed to the ResCap estate at December 31, 2013, and December 31, 2012, respectively. Refer to Note 1 for more information regarding the Debtors' bankruptcy.

Equity_Tables

Equity (Tables)	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Schedule of Stockholders Equity [Table Text Block]	'
	Our common stock has a par value of $0.01 and there are 1,547,779 shares authorized for issuance as of December 31, 2013. Our common stock is not registered with the Securities and Exchange Commission, and there is no established public trading market for the shares. Treasury held 63.4% of Ally common stock as of December 31, 2013. The following table presents changes in the number of shares issued and outstanding.
	(in shares)	2013			2012		2011
	Common stock
	January 1,	1,330,970			1,330,970		1,330,970
	New issuances
	Private placement (a)	216,667			—		—
	December 31,	1,547,637			1,330,970		1,330,970
	(a)	On November 20, 2013, Ally completed its private placement of its common stock for an aggregate price of $1.3 billion.
Schedule of Stock by Class [Table Text Block]	'
	The following table summarizes information about our Series F-2, Series A, and Series G preferred stock.
	December 31,		2013			2012
	Mandatorily convertible preferred stock held by U.S. Department of Treasury
	Series F-2 preferred stock
	Carrying value ($ in millions)		$	—		$	5,685
	Par value (per share)		0.01			0.01
	Liquidation preference (per share)		50			50
	Number of shares authorized		228,750,000			228,750,000
	Number of shares issued and outstanding		—			118,750,000
	Dividend/coupon		9		%	9		%
	Preferred stock
	Series A preferred stock (a)
	Carrying value ($ in millions)		$	1,021		$	1,021
	Par value (per share)		0.01			0.01
	Liquidation preference (per share)		25			25
	Number of shares authorized		160,870,560			160,870,560
	Number of shares issued and outstanding		40,870,560			40,870,560
	Dividend/coupon
	Prior to May 15, 2016		8.5		%	8.5		%
	On and after May 15, 2016		three month			three month
			LIBOR + 6.243%			LIBOR + 6.243%
	Series G preferred stock (b) (c)
	Carrying value ($ in millions)		$	234		$	234
	Par value (per share)		0.01			0.01
	Liquidation preference (per share)		1,000			1,000
	Number of shares authorized		2,576,601			2,576,601
	Number of shares issued and outstanding		2,576,601			2,576,601
	Dividend/coupon		7		%	7		%
	(a)	Nonredeemable prior to May 15, 2016.
	(b)	Pursuant to a registration rights agreement, we are required to maintain an effective shelf registration statement. In the event we fail to meet this obligation, we may be required to pay additional interest to the holders of the Series G Preferred Stock.
	(c)	Redeemable beginning at December 31, 2011.

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Abstract]	'
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'
	The following table presents changes, net of tax, in each component of accumulated other comprehensive income (loss).
	($ in millions)	Unrealized (losses) gains on investment securities (a)				Translation adjustments and net investment hedges (b)				Cash flow hedges (b)			Defined benefit pension plans			Accumulated other comprehensive income (loss)
	Balance at January 1, 2011	$	(26	)		$	416			$	6		$	(137	)	$	259
	2011 net change	(88		)		(64		)		—			(20		)	(172		)
	Balance at December 31, 2011	(114		)		352				6			(157		)	87
	2012 net change	190				16				(4		)	22			224
	Balance at December 31, 2012	76				368				2			(135		)	311
	2013 net change	(345		)		(303		)		3			58			(587		)
	Balance at December 31, 2013	$	(269	)		$	65			$	5		$	(77	)	$	(276	)
	(a)	Represents the after-tax difference between the fair value and amortized cost of our available-for-sale securities portfolio.
	(b)	For additional information on derivative instruments and hedging activities, refer to Note 21.
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	'
	The following table presents the before- and after-tax changes in each component of accumulated other comprehensive income (loss).
	December 31, ($ in millions)	Before Tax				Tax Effect				After Tax
	2013
	Unrealized losses on investment securities
	Net unrealized losses arising during the period	$	(333	)		$	174			$	(159	)
	Less: Net realized gains reclassified to income from continuing operations	180			(a)	(2		)	(b)	178
	Less: Net realized gains reclassified to income from discontinued operations, net of tax	10				(2		)		8
	Net change	(523		)		178				(345		)
	Translation adjustments
	Net unrealized losses arising during the period	(104		)		24				(80		)
	Less: Net realized gains reclassified to income from discontinued operations, net of tax	337				92				429
	Net change	(441		)		(68		)		(509		)
	Net investment hedges (c)
	Net unrealized gains arising during the period	59				(22		)		37
	Less: Net realized losses reclassified to income from discontinued operations, net of tax	(250		)		81				(169		)
	Net change	309				(103		)		206
	Cash flow hedges (c)
	Net unrealized losses arising during the period	(1		)		—				(1		)
	Less: Net realized losses reclassified to income from continuing operations	(7		)	(d)	3			(b)	(4		)
	Net change	6				(3		)		3
	Defined benefit pension plans
	Net unrealized gains arising during the period	26				(8		)		18
	Less: Net losses reclassified to income from continuing operations	(2		)	(e)	—			(b)	(2		)
	Less: Net losses reclassified to income from discontinued operations, net of tax	(49		)		11				(38		)
	Net change	77				(19		)		58
	Other comprehensive loss	$	(572	)		$	(15	)		$	(587	)
	(a)	Includes gains reclassified to other gain on investments, net in our Consolidated Statement of Income.
	(b)	Includes amounts reclassified to income tax (benefit) expense from continuing operations in our Consolidated Statement of Income.
	(c)	For additional information on derivative instruments and hedging activities, refer to Note 21.
	(d)	Includes losses reclassified to interest on long-term debt in our Consolidated Statement of Income.
	(e)	Includes losses reclassified to compensation and benefits expense in our Consolidated Statement of Income.

Earnings_Per_Common_Share_Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	'
	The following table presents the calculation of basic and diluted earnings per common share.
	Year ended December 31, ($ in millions except per share data)		2013			2012			2011
	Net income (loss) from continuing operations		$	416		$	1,370		$	(219	)
	Preferred stock dividends — U.S. Department of Treasury		(543		)	(535		)	(534		)
	Impact of repurchase of mandatorily convertible preferred stock held by U.S. Department of Treasury and elimination of share adjustment right (a)		(240		)	—			—
	Preferred stock dividends		(267		)	(267		)	(260		)
	Impact of preferred stock conversion or amendment		—			—			32
	Net (loss) income from continuing operations attributable to common shareholders (b)		(634		)	568			(981		)
	(Loss) income from discontinued operations, net of tax		(55		)	(174		)	62
	Net (loss) income attributable to common shareholders		$	(689	)	$	394		$	(919	)
	Basic weighted-average common shares outstanding		1,355,375			1,330,970			1,330,970
	Diluted weighted-average common shares outstanding (b)		1,355,375			1,330,970			1,330,970
	Basic earnings per common share
	Net (loss) income from continuing operations		$	(468	)	$	427		$	(738	)
	(Loss) income from discontinued operations, net of tax		(41		)	(131		)	47
	Net (loss) income		$	(509	)	$	296		$	(691	)
	Diluted earnings per common share (b)
	Net (loss) income from continuing operations		$	(468	)	$	427		$	(738	)
	(Loss) income from discontinued operations, net of tax		(41		)	(131		)	47
	Net (loss) income		$	(509	)	$	296		$	(691	)
	(a)	Refer to Note 17 for further detail.
	(b)	Due to the antidilutive effect of converting the Fixed Rate Cumulative Mandatorily Convertible Preferred Stock into common shares and the net loss from continuing operations attributable to common shareholders for 2013, and 2011, respectively, net (loss) income from continuing operations attributable to common shareholders and basic weighted-average common shares outstanding were used to calculate basic and diluted earnings per share.

Regulatory_Capital_Tables

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			Well-capitalized
	December 31, ($ in millions)	Amount		Ratio		Amount		Ratio		minimum			minimum
	Risk-based capital
	Tier 1 (to risk-weighted assets)
	Ally Financial Inc.	$	15,165	11.79	%	$	20,232	13.13	%	4	%		6	%
	Ally Bank	15,159		16.73		14,136		16.26		4			6
	Total (to risk-weighted assets)
	Ally Financial Inc.	$	16,405	12.76	%	$	21,669	14.07	%	8	%		10	%
	Ally Bank	15,809		17.45		14,827		17.06		8			10
	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		15.3		15		(c)	5	%
	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 =160;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%.

Derivative_Instruments_And_Hed1

Derivative Instruments And Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Fair Value Amounts Of Derivative Instruments Reported On Our Condensed Consolidated Balance Sheet [Table Text Block]	'
	The following table summarizes the fair value amounts of derivative instruments reported on our Consolidated Balance Sheet. The fair value amounts are presented on a gross basis, are segregated by derivatives that are designated and qualifying as hedging instruments or those that are not, and are further segregated by type of contract within those two categories. At December 31, 2013 and December 31, 2012, $362 million and $2.3 billion, respectively, of the derivative contracts in a receivable position were classified as other assets on the Consolidated Balance Sheet. At December 31, 2013 and December 31, 2012, $317 million and $2.5 billion of derivative contracts in a liability position were classified as accrued expenses and other liabilities on the Consolidated Balance Sheet.
			2013									2012
			Derivative contracts in a						Notional			Derivative contracts in a				Notional
	December 31, ($ in millions)		receivable			payable			amount			receivable position (a)		payable		amount
			position (a)			position (b)								position (b)
	Derivatives qualifying for hedge accounting
	Interest rate contracts
	Swaps (c)		$	204		$	169		$	21,606		$	411	$	10	$	9,828
	Foreign exchange contracts
	Forwards		3			—			326			35		53		8,693
	Total derivatives qualifying for hedge accounting		207			169			21,932			446		63		18,521
	Economic hedges
	Interest rate contracts
	Swaps		36			44			13,613			1,524		2,255		131,337
	Futures and forwards		11			3			29,836			78		46		62,328
	Written options		—			94			11,132			—		70		3,066
	Purchased options		95			—			22,962			244		—		17,967
	Total interest rate risk		142			141			77,543			1,846		2,371		214,698
	Foreign exchange contracts
	Swaps		12			1			1,379			—		2		—
	Forwards		1			1			330			4		23		2,462
	Written options		—			—			17			—		1		1
	Purchased options		—			—			17			1		—		1
	Total foreign exchange risk		13			2			1,743			5		26		2,464
	Equity contracts
	Written options		—			5			3			—		8		435
	Purchased options		—			—			—			1		—		119
	Total equity risk		—			5			3			1		8		554
	Total economic hedges		155			148			79,289			1,852		2,405		217,716
	Total derivatives		$	362		$	317		$	101,221		$	2,298	$	2,468	$	236,237
	(a)	Includes accrued interest of $120 million and $175 million at December 31, 2013 and 2012, respectively.
	(b)	Includes accrued interest of $12 million and $144 million at December 31, 2013 and 2012, respectively.
	(c)	Includes fair value hedges consisting of receive-fixed swaps on fixed-rate debt obligations with $196 million and $411 million in a receivable position, $163 million and $0 in a payable position, and of an $8.5 billion and $7.2 billion notional amount at December 31, 2013 and December 31, 2012, respectively. Other fair value hedges include pay-fixed swaps on portfolios of held-for-investment automotive loan assets with $9 million in a receivable position, $5 million in a payable position, and of a $12.6 billion notional amount at December 31, 2013. There were no outstanding positions at December 31, 2012. Also includes cash flow hedges consisting of pay-fixed swaps on floating rate debt obligations with $1 million and $10 million in a payable position, and of a $495 million and $2.6 billion notional amount at December 31, 2013 and December 31, 2012, respectively.
Gains and Losses on Derivative Instruments Reported in Statement of Comprehensive Income [Table Text Block]	'
	The following table summarizes the location and amounts of gains and losses on derivative instruments reported in our Consolidated Statement of Income.
	Year ended December 31, ($ in millions)		2013			2012			2011
	Derivatives qualifying for hedge accounting
	Gain (loss) recognized in earnings on derivatives
	Interest rate contracts
	Interest and fees on finance receivables and loans (a)		$	7		$	—		$	—
	Interest on long-term debt (b)		(389		)	164			895
	Foreign exchange contracts
	Other income, net of losses		—			—			35
	Gain (loss) recognized in earnings on hedged items (c)
	Interest rate contracts
	Interest and fees on finance receivables and loans		2			—			—
	Interest on long-term debt		402			(193		)	(851		)
	Foreign exchange contracts
	Other income, net of losses		—			—			(35		)
	Total derivatives qualifying for hedge accounting		22			(29		)	44
	Economic derivatives
	(Loss) gain recognized in earnings on derivatives
	Interest rate contracts
	Servicing asset valuation and hedge activities, net		(112		)	556			359
	Loss on mortgage and automotive loans, net		(37		)	(5		)	(242		)
	Other income, net of losses (d)		14			(18		)	(57		)
	Total interest rate contracts		(135		)	533			60
	Foreign exchange contracts (e)
	Interest on long-term debt		94			(39		)	61
	Other income, net of losses		24			(48		)	17
	Total foreign exchange contracts		118			(87		)	78
	Gain recognized in earnings on derivatives		$	5		$	417		$	182
	(a)	Amounts exclude losses related to interest for qualifying accounting hedges of portfolios of retail automotive loans held-for-investment of $9 million for the year ended December 31, 2013. These losses are primarily offset by the fixed coupon receipts on the retail automotive loans held-for-investment.
	(b)	Amounts exclude gains related to interest for qualifying accounting hedges of debt, which are primarily offset by the fixed coupon payment on the long-term debt. The gains were $131 million, $119 million, and $248 million for the years ended December 31, 2013, 2012, and 2011, respectively.
	(c)	Amounts exclude gains related to amortization of deferred basis adjustments on the de-designated hedged item of $247 million, $226 million, and $216 million for the years ended December 31, 2013, 2012, and 2011, respectively.
	(d)	Amounts in 2012 and 2011 include other income from derivatives held for trading purposes entered into by our broker-dealer.
	(e)	Amounts exclude gains and losses related to the revaluation of the related foreign-denominated debt or receivable. Losses of $117 million, gains of $87 million, and losses of $103 million, were recognized for the years ended December 31, 2013, 2012, and 2011, respectively.
Derivative Instruments Used In Cash Flow and Net Investment Hedge Accounting Relationships [Table Text Block]	'
	The following table summarizes derivative instruments used in cash flow and net investment hedge accounting relationships.
	Year ended December 31, ($ in millions)		2013			2012			2011
	Cash flow hedges
	Interest rate contracts
	(Loss) gain reclassified from accumulated other comprehensive income to interest on long-term debt (a)		$	(7	)	$	1		$	—
	(Loss) gain recorded directly to interest on long-term debt		—			(7		)	5
	Total interest on long-term debt		$	(7	)	$	(6	)	$	5
	Gain (loss) recognized in other comprehensive income		$	6		$	(7	)	$	(1	)
	Net investment hedges
	Foreign exchange contracts
	Loss reclassified from accumulated other comprehensive income to (loss) income from discontinued operations, net		$	(250	)	$	(1	)	$	(8	)
	Loss recorded directly to other income, net of losses (b)		—			—			(3		)
	Total other income, net of losses		$	(250	)	$	(1	)	$	(11	)
	Gain (loss) recognized in other comprehensive income (c)		$	309		$	(270	)	$	173
	(a)	The amount in 2013 represents losses reclassified from other comprehensive income into earnings as a result of the discontinuance of hedge accounting because it is probable that the forecasted transaction will not occur.
	(b)	The amounts represent the forward points excluded from the assessment of hedge effectiveness.
	(c)	The amounts represent the effective portion of net investment hedges. There are offsetting amounts recognized in accumulated other comprehensive income related to the revaluation of the related net investment in foreign operations. There were losses of $582 million, gains of $285 million, and losses of $237 million for the years ended December 31, 2013, 2012, and 2011, respectively.

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	'
	The significant components of income tax (benefit) expense from continuing operations were as follows.
	Year ended December 31, ($ in millions)	2013			2012				2011
	Current income tax expense (benefit)
	U.S. federal	$	—		$	—			$	10
	Foreign	4			(24		)		29
	State and local	—			10				8
	Total current expense (benefit)	4			(14		)		47
	Deferred income tax (benefit) expense
	U.S. federal	(67		)	(663		)		—
	Foreign	(1		)	25				(5		)
	State and local	5			(204		)		—
	Total deferred benefit	(63		)	(842		)		(5		)
	Total income tax (benefit) expense from continuing operations	$	(59	)	$	(856	)		$	42
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	'
	A reconciliation of income tax (benefit) expense from continuing operations with the amounts at the statutory U.S. federal income tax rate is shown in the following table.
	Year ended December 31, ($ in millions)	2013			2012				2011
	Statutory U.S. federal tax expense (benefit)	$	125		$	180			$	(62	)
	Change in tax resulting from
	Effect of valuation allowance change	(154		)	(1,022		)		49
	Tax credits	(45		)	(45		)		—
	Tax law enactment	(44		)	—				—
	Foreign tax differential	(3		)	9				30
	State and local income taxes, net of federal income tax benefit	16			(34		)		22
	Non-deductible expenses	26			12				9
	Other, net	20			44				(6		)
	Total income tax (benefit) expense from continuing operations	$	(59	)	$	(856	)		$	42
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	'
	The significant components of deferred tax assets and liabilities are reflected in the following table.
	December 31, ($ in millions)	2013			2012
	Deferred tax assets
	Tax credit carryforwards	$	1,874		$	1,631
	Tax loss carryforwards	1,624			1,025
	Mark-to-market on consumer finance receivables and loans	721			880
	State and local taxes	297			263
	Provision for loan losses	257			306
	Hedging transactions	177			267
	Unearned insurance premiums	140			142
	ResCap settlement accrual	53			262
	Sales of finance receivables and loans	—			206
	Equity investment in ResCap	—			486
	Other	247			266
	Gross deferred tax assets	5,390			5,734
	Valuation allowance	(1,154		)	(1,653		)
	Net deferred tax assets	4,236			4,081
	Deferred tax liabilities
	Lease transactions	1,527			1,756
	Deferred acquisition costs	351			333
	Debt transactions	191			226
	Basis difference in subsidiaries	55			454
	Sales of finance receivables and loans	26			—
	Other	46			128
	Gross deferred tax liabilities	2,196			2,897
	Net deferred tax assets	$	2,040		$	1,184
Schedule of Deferred tax assets and related valuation allowances recognized for the net operating and other loss carryforwards and tax credit carryforwards [Table Text Block]	'
	The following table summarizes the deferred tax assets and related valuation allowances at December 31, 2013.
	($ in millions)		Deferred Tax Asset			Valuation Allowance				Net Deferred Tax Asset		Years of Expiration
	Tax credit carryforwards
	Foreign tax credits		$	1,753		$	(554	)		$	1,199	2014 - 2023
	General business credits		121			—				121		2032 - 2033
	Total tax credit carryforwards		1,874			(554		)		1,320
	Tax loss carryforwards
	Net operating losses - federal		1,187			—				1,187		2025 - 2033
	Capital losses - federal		437			(437		)		—		2015 - 2017
	Total tax loss carryforwards		1,624			(437		)		1,187
	State and local taxes
	Net operating losses - state		253			(87		)		166		2014 - 2033
	Capital losses - state		46			(46		)		—		2014 - 2017
	Total state and local taxes		299		(a)	(133		)		166
	Other deferred tax assets		1,593			(30		)		1,563		n/a
	Total		$	5,390		$	(1,154	)		$	4,236
	(a)	State net operating loss and capital loss carryforwards are included in the state and local taxes total disclosed in our deferred inventory table above.
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	'
	The following table provides a reconciliation of the beginning and ending amount of unrecognized tax benefits.
	($ in millions)	2013			2012				2011
	Balance at January 1,	$	102		$	198			$	214
	Additions based on tax positions related to the current year	174			14				11
	Additions for tax positions of prior years	1			2				20
	Reductions for tax positions of prior years	—			(4		)		(3		)
	Settlements	(14		)	(17		)		(35		)
	Expiration of statute of limitations	(1		)	(4		)		—
	Foreign-currency translation adjustments	—			(5		)		(9		)
	Deconsolidation of ResCap and discontinued operations	—			(82		)		—
	Balance at December 31,	$	262		$	102			$	198

Employee_Benefits_and_Compensa1

Employee Benefits and Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Compensation Related Costs [Abstract]	'
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]	'
	The following summarizes information related to our pension plans.
	Year ended December 31, ($ in millions)	2013		2012
	Projected benefit obligation	$	141	$	355
	Fair value of plan assets	142		214
	Over/(under) funded status	$	1	$	(141	)

Fair_Value_Tables

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements - Recurring Basis [Table Text Block]	'
			Recurring fair value measurements
	December 31, 2012 ($ in millions)		Level 1				Level 2				Level 3				Total
	Assets
	Investment securities
	Available-for-sale securities
	Debt securities
	U.S. Treasury and federal agencies		$	697			$	1,517			$	—			$	2,214
	Foreign government		3				300				—				303
	Mortgage-backed residential		—				6,906				—				6,906
	Asset-backed		—				2,340				—				2,340
	Corporate debt securities		—				1,263				—				1,263
	Total debt securities		700				12,326				—				13,026
	Equity securities (a)		1,152				—				—				1,152
	Total available-for-sale securities		1,852				12,326				—				14,178
	Mortgage loans held-for-sale, net (b)		—				2,490				—				2,490
	Mortgage servicing rights		—				—				952				952
	Other assets
	Interests retained in financial asset sales		—				—				154				154
	Derivative contracts in a receivable position (c)
	Interest rate		40				2,170				48				2,258
	Foreign currency		—				40				—				40
	Total derivative contracts in a receivable position		40				2,210				48				2,298
	Collateral placed with counterparties (d)		103				99				—				202
	Total assets		$	1,995			$	17,125			$	1,154			$	20,274
	Liabilities
	Accrued expenses and other liabilities
	Derivative contracts in a payable position
	Interest rate		$	(13	)		$	(2,374	)		$	(1	)		$	(2,388	)
	Foreign currency		—				(78		)		(2		)		(80		)
	Total derivative contracts in a payable position		(13		)		(2,452		)		(3		)		(2,468		)
	Total liabilities		$	(13	)		$	(2,452	)		$	(3	)		$	(2,468	)
	(a)	Our investment in any one industry did not exceed 21%.
	(b)	Carried at fair value due to fair value option elections.
	(c)	For additional information on derivative instruments and hedging activities, refer to Note 21.
	(d)	Represents collateral in the form of investment securities. Cash collateral was excluded.
	The following tables display the assets and liabilities measured at fair value on a recurring basis including financial instruments elected for the fair value option. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The tables below display the hedges separately from the hedged items; therefore, they do not directly display the impact of our risk management activities.
			Recurring fair value measurements
	December 31, 2013 ($ in millions)		Level 1				Level 2				Level 3				Total
	Assets
	Investment securities
	Available-for-sale securities
	Debt securities
	U.S. Treasury and federal agencies		$	310			$	1,117			$	—			$	1,427
	U.S. State and political subdivisions		—				315				—				315
	Foreign government		7				281				—				288
	Mortgage-backed residential		—				10,782				—				10,782
	Mortgage-backed commercial		—				39				—				39
	Asset-backed		—				2,219				—				2,219
	Corporate debt securities		—				1,069				—				1,069
	Total debt securities		317				15,822				—				16,139
	Equity securities (a)		944				—				—				944
	Total available-for-sale securities		1,261				15,822				—				17,083
	Mortgage loans held-for-sale, net (b)		—				16				—				16
	Other assets
	Interests retained in financial asset sales		—				—				100				100
	Derivative contracts in a receivable position (c)
	Interest rate		46				207				93				346
	Foreign currency		—				16				—				16
	Total derivative contracts in a receivable position		46				223				93				362
	Collateral placed with counterparties		—				133				—				133
	Total assets		$	1,307			$	16,194			$	193			$	17,694
	Liabilities
	Accrued expenses and other liabilities
Derivative contracts in a payable position (c)
Interest rate		$	(15	)		$	(201	)		$	(94	)		$	(310	)
Foreign currency		—				(2		)		—				(2		)
Other		(5		)		—				—				(5		)
Total derivative contracts in a payable position		(20		)		(203		)		(94		)		(317		)
Total liabilities		$	(20	)		$	(203	)		$	(94	)		$	(317	)
(a)	Our investment in any one industry did not exceed 19%.
(b)	Carried at fair value due to fair value option elections.
(c)	For additional information on derivative instruments and hedging activities, refer to Note 21
Fair Value Measurements - Recurring Fair Value Inputs [Table Text Block]	'
	The following table presents quantitative information regarding the significant unobservable inputs used in significant Level 3 assets and liabilities measured at fair value on a recurring basis.
	December 31, 2013 ($ in millions)		Level 3 recurring measurements				Valuation technique		Unobservable input		Range
	Assets
	Other assets
	Interests retained in financial asset sales		$	100			Discounted cash flow		Discount rate		5.3-5.5%
									Commercial paper rate		0-0.1%
Fair Value Measurements - Reconciliation of Level 3 Assets and Liabilities [Table Text Block]	'
	The following tables present the reconciliation for all Level 3 assets and liabilities measured at fair value on a recurring basis. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The Level 3 items presented below may be hedged by derivatives and other financial instruments that are classified as Level 1 or Level 2. Thus, the following tables do not fully reflect the impact of our risk management activities.
		Level 3 recurring fair value measurements
					Net realized/unrealized																						Fair value at December 31, 2013			Net unrealized gains included in earnings still held at December 31, 2013
					(losses) gains
	($ in millions)	Fair value at January 1, 2013			included				included			Purchases			Sales			Issuances			Settlements			Transfers out of level 3
					in  earnings				in OCI
	Assets
	Mortgage servicing rights	$	952		$	(101	)	(a)	$	—		$	—		$	(911	)	$	60		$	—		$	—		$	—		$	—
	Other assets
	Interests retained in financial asset sales	154			23			(b)	—			—			—			—			(77		)	—			100			—
	Derivative contracts, net (c)
	Interest rate	47			(52		)	(d)	—			—			—			—			4			—			(1		)	—
	Foreign currency	(2		)	11			(d)	—			—			—			—			2			(11		)	—			11			(d)
	Total derivative contracts in a receivable position, net	45			(41		)		—			—			—			—			6			(11		)	(1		)	11
	Total assets	$	1,151		$	(119	)		$	—		$	—		$	(911	)	$	60		$	(71	)	$	(11	)	$	99		$	11
	(a)	Fair value adjustment was reported as servicing-asset valuation and hedge activities, net, in the Consolidated Statement of Income.
	(b)	Reported as other income, net of losses, in the Consolidated Statement of Income.
	(c)	For additional information on derivative instruments and hedging activities, refer to Note 21.
	(d)	Refer to Note 21 for information related to the location of the gains and losses on derivative instruments in the Consolidated Statement of Income.
		Level 3 recurring fair value measurements
		Fair value			Net realized/unrealized							Purchases			Sales				Issuances			Settlements			Transfers out due to deconsolidation or discontinued operations (a)			Fair value at December 31, 2012			Net
		at			gains (losses)																										unrealized
		1-Jan-12																													gains (losses)
																															included  in
																															earnings still
																															held at
	($ in millions)				included				included in OCI																						31-Dec-12
					in
					earnings
	Assets
	Trading assets (excluding derivatives)
	Mortgage-backed residential securities	$	33		$	2		(b)	$	—		$	—		$	—			$	—		$	(4	)	$	(31	)	$	—		$	4		(b)
	Investment securities
	Available-for-sale debt securities
	Asset-backed	62			19				(12		)	—			(69		)		—			—			—			—			—
	Mortgage loans held-for-sale, net (c)	30			—				—			12			—				—			(11		)	(31		)	—			—
	Consumer mortgage finance receivables and loans, net (c)	835			121			(c)	—			—			(245		)	(d)	—			(124		)	(587		)	—			51			(c)
	Mortgage servicing rights	2,519			(677		)	(e)	—			—			—				240			—			(1,130		)	952			(677		)	(e)
	Other assets
	Interests retained in financial asset sales	231			46			(f)	—			—			—				—			(123		)	—			154			—
	Derivative contracts, net (g)
	Interest rate	71			(78		)	(h)	—			—			—				—			53			1			47			1			(h)
	Foreign currency	16			(32		)	(h)	—			—			—				—			—			14			(2		)	(50		)	(h)
	Total derivative contracts in a receivable (payable) position, net	87			(110		)		—			—			—				—			53			15			45			(49		)
	Total assets	$	3,797		$	(599	)		$	(12	)	$	12		$	(314	)		$	240		$	(209	)	$	(1,764	)	$	1,151		$	(671	)
	Liabilities
	Long-term debt
	On-balance sheet securitization debt (c)	$	(830	)	$	(115	)	(c)	$	—		$	—		$	—			$	—		$	389		$	556		$	—		$	(62	)	(c)
	Accrued expenses and other liabilities
	Loan repurchase liabilities (c)	(29		)	—				—			(11		)	—				—			10			30			—			—
	Total liabilities	$	(859	)	$	(115	)		$	—		$	(11	)	$	—			$	—		$	399		$	586		$	—		$	(62	)
	(a)	Represents the amounts transferred out of Level 3 due to the deconsolidation of ResCap or discontinued operations. Refer to Note 1 for additional information related to ResCap. Refer to Note 2 for additional information related to discontinued operations.
	(b)	The fair value adjustment and the related interest were reported as income from discontinued operations, net of tax, in the Consolidated Statement of Income.
	(c)	Carried at fair value due to fair value option elections. Refer to the next section of this note titled Fair Value Option for Financial Assets and Liabilities for the location of the gains and losses in the Consolidated Statement of Income.
	(d)	Represents the sale of consumer mortgage finance receivables and loans sold as part of the sale of a business line during 2012.
	(e)	Fair value adjustment was reported as servicing-asset valuation and hedge activities, net and income from discontinued operations, net of tax, in the Consolidated Statement of Income.
	(f)	Reported as other income, net of losses, and income from discontinued operations, net of tax, in the Consolidated Statement of Income.
	(g)	Includes derivatives classified as trading. For additional information on derivative instruments and hedging activities, refer to Note 21.
	(h)	Refer to Note 21 for information related to the location of the gains and losses on derivative instruments in the Consolidated Statement of Income.
Fair Value Measurements - Nonrecurring Basis [Table Text Block]	'
			Nonrecurring																Lower-of-cost				Total loss
			fair value measurements																or				included in
																			fair value				earnings for
																			or valuation				the year ended
																			reserve
	December 31, 2012 ($ in millions)		Level 1				Level 2				Level 3				Total				allowance
	Assets
	Commercial finance receivables and loans, net (a)
	Automotive		$	—			$	—			$	108			$	108			$	(19	)		n/m	(b)
	Other		—				—				23				23				(7		)		n/m	(b)
	Total commercial finance receivables and loans, net		—				—				131				131				(26		)		n/m	(b)
	Other assets
	Repossessed and foreclosed assets (c)		—				—				3				3				(2		)		n/m	(b)
	Total assets		$	—			$	—			$	134			$	134			$	(28	)		n/m
	n/m =ot meaningful
	(a)	Represents the portion of the portfolio specifically impaired during 2012. The related valuation allowance represents the cumulative adjustment to fair value of those specific receivables.
	(b)	We consider the applicable valuation or loan loss allowance to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation or loan loss allowance.
	(c)	The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value.
	The following tables display the assets and liabilities measured at fair value on a nonrecurring basis.
			Nonrecurring																Lower-of-cost				Total loss
			fair value measurements																or				included in
																			fair value				earnings for
																			or valuation				the year ended
																			reserve
	December 31, 2013 ($ in millions)		Level 1				Level 2				Level 3				Total				allowance
	Assets
	Loans held-for-sale		$	—			$	—			$	18			$	18			$	—			n/m	(a)
	Commercial finance receivables and loans, net (b)
	Automotive		—				—				54				54				(9		)		n/m	(a)
	Other		—				—				59				59				(16		)		n/m	(a)
	Total commercial finance receivables and loans, net		—				—				113				113				(25		)		n/m	(a)
	Other assets
	Repossessed and foreclosed assets (c)		—				—				9				9				(3		)		n/m	(a)
	Other		—				—				2				2				—				n/m	(a)
	Total assets		$	—			$	—			$	142			$	142			$	(28	)		n/m
	n/m =ot meaningful
	(a)	We consider the applicable valuation or loan loss allowance to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation or loan loss allowance.
	(b)	Represents the portion of the portfolio specifically impaired during 2013. The related valuation allowance represents the cumulative adjustment to fair value of those specific receivables.
	(c)	The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value.
Fair Value Measurements - Nonrecurring Fair Value Inputs [Table Text Block]	'
	The following table presents quantitative information regarding the significant unobservable inputs used in significant Level 3 assets measured at fair value on a nonrecurring basis.
	December 31, 2013 ($ in millions)		Level 3 nonrecurring measurements				Valuation technique		Unobservable input		Range
	Assets
	Commercial finance receivables and loans, net
	Automotive		$	54			Fair value of collateral		Adjusted appraisal value		65.0-95.0%
Fair Value Option - Summary of Changes Included in the Condensed Consolidated Statement of Income [Table Text Block]	'
	The following tables summarize the fair value option elections and information regarding the amounts recorded as earnings for each fair value option-elected item.
			Changes included in the
			Consolidated Statement of Income
	Year ended December 31, ($ in millions)		Interest				Loss on				Total
			on loans				mortgage				included in
			held-for-sale (a)				loans, net				earnings
	2013
	Assets
	Mortgage loans held-for-sale, net		$	20			$	(31	)		$	(11	)
	2012
	Assets
	Mortgage loans held-for-sale, net		$	82			$	(32	)		$	50
	(a)	Interest income is measured by multiplying the unpaid principal balance on the loans by the coupon rate and the number of days of interest due.
Fair Value Option Election [Table Text Block]	'
	The following table provides the aggregate fair value and the aggregate unpaid principal balance for the fair value option-elected loans.
			2013								2012
	December 31, ($ in millions)		Unpaid				Fair				Unpaid				Fair
			principal				value (a)				principal				value (a)
			balance								balance
	Assets
	Mortgage loans held-for-sale, net
	Total loans		$	31			$	16			$	2,416			$	2,490
	Nonaccrual loans		18				9				47				25
	Loans 90+ days past due (b)		15				8				36				19
	(a)	Excludes accrued interest receivable.
	(b)	Loans 90+ days past due are also presented within the nonaccrual loan balance and the total loan balance; however, excludes government-insured loans that are still accruing interest.
Fair Value of Financial Intruments [Table Text Block]	'
	The following table presents the carrying and estimated fair value of financial instruments, except for those recorded at fair value on a recurring basis presented in the previous section of this note titled Recurring Fair Value. When possible, we use quoted market prices to determine fair value. Where quoted market prices are not available, the fair value is internally derived based on appropriate valuation methodologies with respect to the amount and timing of future cash flows and estimated discount rates. However, considerable judgment is required in interpreting market data to develop estimates of fair value, so the estimates are not necessarily indicative of the amounts that could be realized or would be paid in a current market exchange. The effect of using different market assumptions or estimation methodologies could be material to the estimated fair values. Fair value information presented herein was based on information available at December 31, 2013 and 2012.
						Estimated fair value
	December 31, ($ in millions)	Carrying				Level 1				Level 2				Level 3				Total
		value
	2013
	Financial assets
	Loans held-for-sale, net (a)	$	35			$	—			$	17			$	18			$	35
	Finance receivables and loans, net (a)	99,120				—				—				100,090				100,090
	Nonmarketable equity investments	337				—				308				38				346
	Financial liabilities
	Deposit liabilities	$	53,350			$	—			$	—			$	54,070			$	54,070
	Short-term borrowings	8,545				—				—				8,545				8,545
	Long-term debt (a)(b)	69,824				—				31,067				42,297				73,364
	2012
	Financial assets
	Loans held-for-sale, net (a)	$	2,576			$	—			$	2,490			$	86			$	2,576
	Finance receivables and loans, net (a)	97,885				—				—				98,907				98,907
	Nonmarketable equity investments	303				—				272				34				306
	Financial liabilities
	Deposit liabilities	$	47,915			$	—			$	—			$	48,752			$	48,752
	Short-term borrowings	7,461				6				—				7,454				7,460
	Long-term debt (a)(b)	74,882				—				36,018				42,533				78,551
	(a)	Includes financial instruments carried at fair value due to fair value option elections. Refer to the previous section of this note titled Fair Value Option for Financial Assets and Liabilities for further information about the fair value elections.
	(b)	The carrying value includes deferred interest for zero-coupon bonds of $359 million and $321 million at December 31, 2013, and 2012, respectively

Offsetting_Assets_and_Liabilit1

Offsetting Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2013
Offsetting [Abstract]	'
Offsetting Assets and Liabilities [Table Text Block]	'
			Gross Amounts of Recognized Assets/(Liabilities)			Gross Amounts Offset in the Consolidated Balance Sheet		Net Amounts of Assets/(Liabilities) Presented in the Consolidated Balance Sheet
											Gross Amounts Not Offset in the Consolidated Balance Sheet
	December 31, 2012 ($ in millions)										Financial Instruments			Collateral (a)			Net Amount
	Assets
	Derivative assets in net asset positions		$	1,395		$	—	$	1,395		$	(503	)	$	(841	)	$	51
	Derivative assets in net liability positions		788			—		788			(788		)	—			—
	Derivative assets with no offsetting arrangements		115			—		115			—			—			115
	Total assets (b)		$	2,298		$	—	$	2,298		$	(1,291	)	$	(841	)	$	166
	Liabilities
	Derivative liabilities in net liability positions		$	(1,929	)	$	—	$	(1,929	)	$	788		$	1,092		$	(49	)
	Derivative liabilities in net asset positions		(503		)	—		(503		)	503			—			—
	Derivative liabilities with no offsetting arrangements		(36		)	—		(36		)	—			—			(36		)
	Total liabilities (b)		$	(2,468	)	$	—	$	(2,468	)	$	1,291		$	1,092		$	(85	)
	(a)	Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty.
	(b)	For additional information on derivative instruments and hedging activities, refer to Note 21.
	The composition of offsetting derivative instruments, financial assets, and financial liabilities was as follows.
			Gross Amounts of Recognized Assets/(Liabilities)			Gross Amounts Offset in the Consolidated Balance Sheet		Net Amounts of Assets/(Liabilities) Presented in the Consolidated Balance Sheet
											Gross Amounts Not Offset in the Consolidated Balance Sheet
	December 31, 2013 ($ in millions)										Financial Instruments			Collateral (a)			Net Amount
	Assets
	Derivative assets in net asset positions		$	319		$	—	$	319		$	(65	)	$	(120	)	$	134
	Derivative assets in net liability positions		43			—		43			(43		)	—			—
	Total assets (b)		$	362		$	—	$	362		$	(108	)	$	(120	)	$	134
	Liabilities
	Derivative liabilities in net liability positions		$	(252	)	$	—	$	(252	)	$	43		$	137		$	(72	)
	Derivative liabilities in net asset positions		(65		)	—		(65		)	65			—			—
	Total derivative liabilities (b)		(317		)	—		(317		)	108			137			(72		)
	Securities sold under agreements to repurchase (c)		(1,500		)	—		(1,500		)	—			1,500			—
	Total liabilities		$	(1,817	)	$	—	$	(1,817	)	$	108		$	1,637		$	(72	)
	(a)	Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty.
	(b)	For additional information on derivative instruments and hedging activities, refer to Note 21.
	(c)	For additional information on securities sold under agreements to repurchase, refer to Note 14.

Segment_And_Geographic_Informa1

Segment And Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Schedule of Segment Reporting Information, by Segment [Table Text Block]	'
	Financial information for our reportable operating segments is summarized as follows.
	Year ended December 31,		Automotive Finance operations			Insurance			Mortgage operations			Corporate			Consolidated (b)
	($ in millions)					operations						and
												Other (a)
	2013
	Net financing revenue (loss)		$	3,159		$	57		$	76		$	(513	)	$	2,779
	Other revenue		268			1,196			—			20			1,484
	Total net revenue (loss)		3,427			1,253			76			(493		)	4,263
	Provision for loan losses		494			—			13			(6		)	501
	Total noninterest expense		1,662			999			321			423			3,405
	Income (loss) from continuing operations before income tax expense		$	1,271		$	254		$	(258	)	$	(910	)	$	357
	Total assets		$	109,312		$	7,124		$	8,168		$	26,563		$	151,167
	2012
	Net financing revenue (loss)		$	2,827		$	64		$	149		$	(1,149	)	$	1,891
	Other revenue (loss)		322			1,150			1,159			(57		)	2,574
	Total net revenue (loss)		3,149			1,214			1,308			(1,206		)	4,465
	Provision for loan losses		253			—			86			(10		)	329
	Total noninterest expense		1,507			1,054			627			434			3,622
	Income (loss) from continuing operations before income tax expense		$	1,389		$	160		$	595		$	(1,630	)	$	514
	Total assets		$	128,411		$	8,439		$	14,744		$	30,753		$	182,347
	2011
	Net financing revenue (loss)		$	2,530		$	62		$	205		$	(1,673	)	$	1,124
	Other revenue		422			1,336			354			176			2,288
	Total net revenue (loss)		2,952			1,398			559			(1,497		)	3,412
	Provision for loan losses		89			—			123			(51		)	161
	Total noninterest expense		1,530			1,082			344			472			3,428
	Income (loss) from continuing operations before income tax expense		$	1,333		$	316		$	92		$	(1,918	)	$	(177	)
	Total assets		$	112,591		$	8,036		$	33,906		$	29,526		$	184,059
	(a)	Total assets for the Commercial Finance Group were $1.6 billion, $1.5 billion, and $1.2 billion at December 31, 2013, 2012 and 2011, respectively.
	(b)	Net financing revenue after the provision for loan losses totaled $2.3 billion, $1.6 billion, and $1.0 billion for the years ended December 31, 2013, 2012, and 2011, respectively.
Information Concerning Principal Geographic Areas [Table Text Block]	'
	Information concerning principal geographic areas were as follows.
	Year ended December 31, ($ in millions)		Revenue  (a)			Income (loss)			Net income			Identifiable assets (c)			Long-lived assets (d)
						from continuing			(loss) (b)
						operations
						before income
						tax expense (b)
	2013
	Canada		$	171		$	64		$	1,266		$	704		$	—
	Europe (e)		(8		)	(18		)	(88		)	1,972			—
	Latin America		—			7			300			29			—
	Asia-Pacific		1			(2		)	117			520			—
	Total foreign		164			51			1,595			3,225			—
	Total domestic (f)		4,099			306			(1,234		)	147,915			17,916
	Total		$	4,263		$	357		$	361		$	151,140		$	17,916
	2012
	Canada		$	233		$	48		$	295		$	13,362		$	1
	Europe (e)		(28		)	(14		)	183			10,971			16
	Latin America		2			(19		)	219			8,050			33
	Asia-Pacific		4			3			99			395			—
	Total foreign		211			18			796			32,778			50
	Total domestic (f)		4,254			496			400			149,542			13,831
	Total		$	4,465		$	514		$	1,196		$	182,320		$	13,881
	2011
	Canada		$	174		$	(13	)	$	436		$	15,156		$	282
	Europe (e)		(42		)	(3		)	175			9,976			92
	Latin America		4			(18		)	104			7,647			30
	Asia-Pacific		2			—			69			292			—
	Total foreign		138			(34		)	784			33,071			404
	Total domestic (f)		3,274			(143		)	(941		)	150,470			9,236
	Total		$	3,412		$	(177	)	$	(157	)	$	183,541		$	9,640
	(a)	Revenue consists of net financing revenue and total other revenue as presented in our Consolidated Statement of Income.
	(b)	The domestic amounts include original discount amortization of $262 million, $349 million, and $925 million for the years ended December 31, 2013, 2012, and 2011, respectively.
	(c)	Identifiable assets consist of total assets excluding goodwill.
	(d)	Long-lived assets consist of investment in operating leases, net, and net property and equipment.
	(e)	Amounts include eliminations between our foreign operations.
	(f)	Amounts include eliminations between our domestic and foreign operations.

Parent_And_Guarantor_Consolida1

Parent And Guarantor Consolidating Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Condensed Income Statement [Table Text Block]	'
	Year ended December 31, 2011 ($ in millions)		Parent				Guarantors				Nonguarantors				Consolidating adjustments				Ally
																			consolidated
	Financing revenue and other interest income
	Interest and fees on finance receivables and loans		$	1,071			$	—			$	3,128			$	(10	)		$	4,189
	Interest and fees on finance receivables and loans — intercompany		173				—				26				(199		)		—
	Interest on loans held-for-sale		5				—				175				—				180
	Interest on trading assets		—				—				8				—				8
	Interest and dividends on available-for-sale investment securities		4				—				346				—				350
	Interest-bearing cash		5				—				10				—				15
	Operating leases		713				—				1,216				—				1,929
	Total financing revenue and other interest income		1,971				—				4,909				(209		)		6,671
	Interest expense
	Interest on deposits		65				—				550				—				615
	Interest on short-term borrowings		56				—				5				—				61
	Interest on long-term debt		3,365				(1		)		587				(21		)		3,930
	Interest on intercompany debt		(13		)		2				196				(185		)		—
	Total interest expense		3,473				1				1,338				(206		)		4,606
	Depreciation expense on operating lease assets		250				—				691				—				941
	Net financing (loss) revenue		(1,752		)		(1		)		2,880				(3		)		1,124
	Dividends from subsidiaries
	Nonbank subsidiaries		1,383				—				—				(1,383		)		—
	Other revenue
	Servicing fees		270				—				256				(1		)		525
	Servicing asset valuation and hedge activities, net		—				—				(434		)		—				(434		)
	Total servicing income (loss), net		270				—				(178		)		(1		)		91
	Insurance premiums and service revenue earned		—				—				1,153				—				1,153
	Gain on mortgage and automotive loans, net		22				—				207				—				229
	Loss on extinguishment of debt		(64		)		—				—				—				(64		)
	Other gain on investments, net		10				—				248				—				258
	Other income, net of losses		(167		)		37				1,415				(664		)		621
	Total other revenue		71				37				2,845				(665		)		2,288
	Total net (loss) revenue		(298		)		36				5,725				(2,051		)		3,412
	Provision for loan losses		58				—				103				—				161
	Noninterest expense
	Compensation and benefits expense		685				37				308				(37		)		993
	Insurance losses and loss adjustment expenses		—				—				452				—				452
	Other operating expenses		541				1				2,069				(628		)		1,983
	Total noninterest expense		1,226				38				2,829				(665		)		3,428
	(Loss) income from continuing operations before income tax (benefit) expense and undistributed income (loss) of subsidiaries		(1,582		)		(2		)		2,793				(1,386		)		(177		)
	Income tax (benefit) expense from continuing operations		(616		)		(1		)		659				—				42
	Net (loss) income from continuing operations		(966		)		(1		)		2,134				(1,386		)		(219		)
	Income (loss) from discontinued operations, net of tax		10				(8		)		57				3				62
	Undistributed income (loss) of subsidiaries
	Bank subsidiary		1,254				1,254				—				(2,508		)		—
	Nonbank subsidiaries		(455		)		477				—				(22		)		—
	Net (loss) income		(157		)		1,722				2,191				(3,913		)		(157		)
	Other comprehensive loss, net of tax		(172		)		(63		)		(346		)		409				(172		)
	Comprehensive (loss) income		$	(329	)		$	1,659			$	1,845			$	(3,504	)		$	(329	)
	Condensed Consolidating Statements of Comprehensive Income
	Year ended December 31, 2013 ($ in millions)		Parent				Guarantors				Nonguarantors				Consolidating adjustments				Ally
																			consolidated
	Financing revenue and other interest income
	Interest and fees on finance receivables and loans		$	771			$	—			$	3,758			$	—			$	4,529
	Interest and fees on finance receivables and loans — intercompany		59				—				68				(127		)		—
	Interest on loans held-for-sale		—				—				20				—				20
	Interest and dividends on available-for-sale investment securities		—				—				325				—				325
	Interest-bearing cash		3				—				7				—				10
	Interest-bearing cash — intercompany		—				—				7				(7		)		—
	Operating leases		500				—				2,709				—				3,209
	Total financing revenue and other interest income		1,333				—				6,894				(134		)		8,093
	Interest expense
	Interest on deposits		25				—				629				—				654
	Interest on short-term borrowings		46				—				17				—				63
Interest on long-term debt		2,039				—				568				(5		)		2,602
Interest on intercompany debt		66				—				62				(128		)		—
Total interest expense		2,176				—				1,276				(133		)		3,319
Depreciation expense on operating lease assets		369				—				1,626				—				1,995
Net financing (loss) revenue		(1,212		)		—				3,992				(1		)		2,779
Dividends from subsidiaries
Nonbank subsidiaries		5,732				3,659				—				(9,391		)		—
Other revenue
Servicing fees		152				—				(26		)		—				126
Servicing asset valuation and hedge activities, net		—				—				(213		)		—				(213		)
Total servicing income (loss), net		152				—				(239		)		—				(87		)
Insurance premiums and service revenue earned		—				—				1,012				—				1,012
Gain on mortgage and automotive loans, net		—				—				55				—				55
(Loss) gain on extinguishment of debt		(61		)		—				2				—				(59		)
Other gain on investments, net		—				—				180				—				180
Other income, net of losses		157				—				1,438				(1,212		)		383
Total other revenue		248				—				2,448				(1,212		)		1,484
Total net revenue		4,768				3,659				6,440				(10,604		)		4,263
Provision for loan losses		196				—				305				—				501
Noninterest expense
Compensation and benefits expense		639				—				822				(442		)		1,019
Insurance losses and loss adjustment expenses		—				—				405				—				405
Other operating expenses		503				—				2,248				(770		)		1,981
Total noninterest expense		1,142				—				3,475				(1,212		)		3,405
Income from continuing operations before income tax (benefit) expense and undistributed income (loss) of subsidiaries		3,430				3,659				2,660				(9,392		)		357
Income tax (benefit) expense from continuing operations		(967		)		—				908				—				(59		)
Net income from continuing operations		4,397				3,659				1,752				(9,392		)		416
(Loss) income from discontinued operations, net of tax		(1,311		)		(19		)		1,274				1				(55		)
Undistributed income (loss) of subsidiaries
Bank subsidiary		883				883				—				(1,766		)		—
Nonbank subsidiaries		(3,608		)		(2,393		)		—				6,001				—
Net income		361				2,130				3,026				(5,156		)		361
Other comprehensive loss, net of tax		(587		)		(812		)		(858		)		1,670				(587		)
Comprehensive (loss) income		$	(226	)		$	1,318			$	2,168			$	(3,486	)		$	(226	)
Year ended December 31, 2012 ($ in millions)		Parent				Guarantors				Nonguarantors				Consolidating adjustments				Ally
																		consolidated
Financing revenue and other interest income
Interest and fees on finance receivables and loans		$	852			$	—			$	3,687			$	—			$	4,539
Interest and fees on finance receivables and loans — intercompany		104				—				22				(126		)		—
Interest on loans held-for-sale		15				—				83				—				98
Interest on trading assets		—				—				10				—				10
Interest and dividends on available-for-sale investment securities		—				—				292				—				292
Interest-bearing cash		16				—				8				—				24
Interest-bearing cash — intercompany		—				—				16				(16		)		—
Operating leases		232				—				2,147				—				2,379
Total financing revenue and other interest income		1,219				—				6,265				(142		)		7,342
Interest expense
Interest on deposits		58				—				587				—				645
Interest on short-term borrowings		60				—				11				—				71
Interest on long-term debt		2,676				—				677				(17		)		3,336
Interest on intercompany debt		(1		)		1				120				(120		)		—
Total interest expense		2,793				1				1,395				(137		)		4,052
Depreciation expense on operating lease assets		113				—				1,286				—				1,399
Net financing (loss) revenue		(1,687		)		(1		)		3,584				(5		)		1,891
Dividends from subsidiaries
Nonbank subsidiaries		1,074				448				—				(1,522		)		—
Other revenue
Servicing fees		191				—				218				—				409
Servicing asset valuation and hedge activities, net		—				—				(4		)		—				(4		)
Total servicing income, net		191				—				214				—				405
Insurance premiums and service revenue earned		—				—				1,055				—				1,055
(Loss) gain on mortgage and automotive loans, net		(2		)		—				381				—				379
Loss on extinguishment of debt		—				—				(148		)		—				(148		)
Other gain on investments, net		—				—				146				—				146
Other income, net of losses		173				474				1,280				(1,190		)		737
Total other revenue		362				474				2,928				(1,190		)		2,574
Total net (loss) revenue		(251		)		921				6,512				(2,717		)		4,465
Provision for loan losses		81				—				248				—				329
Noninterest expense
Compensation and benefits expense		728				473				381				(476		)		1,106
Insurance losses and loss adjustment expenses		—				—				454				—				454
Other operating expenses		1,090				1				1,685				(714		)		2,062
Total noninterest expense		1,818				474				2,520				(1,190		)		3,622
(Loss) income from continuing operations before income tax benefit and undistributed income (loss) of subsidiaries		(2,150		)		447				3,744				(1,527		)		514
Income tax benefit from continuing operations		(172		)		—				(684		)		—				(856		)
Net (loss) income from continuing operations		(1,978		)		447				4,428				(1,527		)		1,370
Income (loss) from discontinued operations, net of tax		49				(93		)		(130		)		—				(174		)
Undistributed income (loss) of subsidiaries
Bank subsidiary		859				859				—				(1,718		)		—
Nonbank subsidiaries		2,266				(105		)		—				(2,161		)		—
Net income		1,196				1,108				4,298				(5,406		)		1,196
Other comprehensive income, net of tax		224				149				411				(560		)		224
Comprehensive income		$	1,420			$	1,257			$	4,709			$	(5,966	)		$	1,420
Condensed Balance Sheet [Table Text Block]	'
	Condensed Consolidating Balance Sheet
	December 31, 2013 ($ in millions)		Parent (a)				Guarantors				Nonguarantors (a)				Consolidating				Ally
															adjustments				consolidated
	Assets
	Cash and cash equivalents
	Noninterest-bearing		$	979			$	37			$	299			$	—			$	1,315
	Interest-bearing		1,951				—				2,265				—				4,216
	Interest-bearing — intercompany		—				—				410				(410		)		—
	Total cash and cash equivalents		2,930				37				2,974				(410		)		5,531
	Investment securities		—				—				17,083				—				17,083
	Loans held-for-sale, net		—				—				35				—				35
	Finance receivables and loans, net
	Finance receivables and loans, net		6,673				—				93,655				—				100,328
	Intercompany loans to
	Bank subsidiary		600				—				—				(600		)		—
	Nonbank subsidiaries		4,207				—				1,925				(6,132		)		—
	Allowance for loan losses		(131		)		—				(1,077		)		—				(1,208		)
	Total finance receivables and loans, net		11,349				—				94,503				(6,732		)		99,120
	Investment in operating leases, net		3,172				—				14,508				—				17,680
	Intercompany receivables from
	Bank subsidiary		236				—				—				(236		)		—
	Nonbank subsidiaries		465				—				588				(1,053		)		—
	Investment in subsidiaries
	Bank subsidiary		14,916				14,916				—				(29,832		)		—
	Nonbank subsidiaries		12,201				68				—				(12,269		)		—
	Premiums receivable and other insurance assets		—				—				1,634				(21		)		1,613
	Other assets		3,122				—				6,880				(413		)		9,589
	Assets of operations held-for-sale		516				—				—				—				516
	Total assets		$	48,907			$	15,021			$	138,205			$	(50,966	)		$	151,167
	Liabilities
	Deposit liabilities
	Noninterest-bearing		$	—			$	—			$	60			$	—			$	60
	Interest-bearing		440				—				52,850				—				53,290
	Total deposit liabilities		440				—				52,910				—				53,350
	Short-term borrowings		3,225				—				5,320				—				8,545
	Long-term debt		25,819				—				43,646				—				69,465
	Intercompany debt to
	Nonbank subsidiaries		2,334				—				4,808				(7,142		)		—
	Intercompany payables to
	Bank subsidiary		197				—				—				(197		)		—
	Nonbank subsidiaries		666				—				447				(1,113		)		—
	Interest payable		709				—				179				—				888
	Unearned insurance premiums and service revenue		—				—				2,314				—				2,314
	Accrued expenses and other liabilities		1,309				93				1,408				(413		)		2,397
	Total liabilities		34,699				93				111,032				(8,865		)		136,959
	Total equity		14,208				14,928				27,173				(42,101		)		14,208
	Total liabilities and equity		$	48,907			$	15,021			$	138,205			$	(50,966	)		$	151,167
	(a)	Amounts presented are based upon the legal transfer of the underlying assets to VIEs in order to reflect legal ownership.
	December 31, 2012 ($ in millions)		Parent (a)				Guarantors				Nonguarantors (a)				Consolidating				Ally
															adjustments				consolidated
	Assets
	Cash and cash equivalents
	Noninterest-bearing		$	729			$	—			$	344			$	—			$	1,073
	Noninterest-bearing — intercompany		39				—				—				(39		)		—
	Interest-bearing		3,204				—				3,236				—				6,440
	Interest-bearing — intercompany		—				—				452				(452		)		—
	Total cash and cash equivalents		3,972				—				4,032				(491		)		7,513
	Investment securities		—				—				14,178				—				14,178
	Loans held-for-sale, net		—				—				2,576				—				2,576
	Finance receivables and loans, net
	Finance receivables and loans, net		12,486				—				86,569				—				99,055
	Intercompany loans to
	Bank subsidiary		1,600				—				—				(1,600		)		—
Nonbank subsidiaries		3,514				—				672				(4,186		)		—
Allowance for loan losses		(170		)		—				(1,000		)		—				(1,170		)
Total finance receivables and loans, net		17,430				—				86,241				(5,786		)		97,885
Investment in operating leases, net		2,003				—				11,547				—				13,550
Intercompany receivables from
Bank subsidiary		677				—				—				(677		)		—
Nonbank subsidiaries		315				334				378				(1,027		)		—
Investment in subsidiaries
Bank subsidiary		14,288				14,288				—				(28,576		)		—
Nonbank subsidiaries		19,180				3,723				—				(22,903		)		—
Mortgage servicing rights		—				—				952				—				952
Premiums receivable and other insurance assets		—				—				1,609				—				1,609
Other assets		2,514				—				9,968				(574		)		11,908
Assets of operations held-for-sale		855				762				30,582				(23		)		32,176
Total assets		$	61,234			$	19,107			$	162,063			$	(60,057	)		$	182,347
Liabilities
Deposit liabilities
Noninterest-bearing		$	—			$	—			$	1,977			$	—			$	1,977
Noninterest-bearing — intercompany		—				—				39				(39		)		—
Interest-bearing		983				—				44,955				—				45,938
Total deposit liabilities		983				—				46,971				(39		)		47,915
Short-term borrowings		3,094				—				4,367				—				7,461
Long-term debt		32,342				—				42,219				—				74,561
Intercompany debt to
Nonbank subsidiaries		530				—				5,708				(6,238		)		—
Intercompany payables to
Bank subsidiary		752				—				—				(752		)		—
Nonbank subsidiaries		674				—				278				(952		)		—
Interest payable		748				—				184				—				932
Unearned insurance premiums and service revenue		—				—				2,296				—				2,296
Accrued expenses and other liabilities		2,187				451				4,517				(570		)		6,585
Liabilities of operations held-for-sale		26				725				21,948				—				22,699
Total liabilities		41,336				1,176				128,488				(8,551		)		162,449
Total equity		19,898				17,931				33,575				(51,506		)		19,898
Total liabilities and equity		$	61,234			$	19,107			$	162,063			$	(60,057	)		$	182,347
(a)	Amounts presented are based upon the legal transfer of the underlying assets to VIEs in order to reflect legal ownership.
Condensed Cash Flow Statement [Table Text Block]	'
	Condensed Consolidating Statement of Cash Flows
	Year ended December 31, 2013 ($ in millions)		Parent				Guarantors				Nonguarantors				Consolidating				Ally
															adjustments				consolidated
	Operating activities
	Net cash provided by operating activities		$	3,015			$	3,572			$	5,305			$	(9,391	)		$	2,501
	Investing activities
	Purchases of available-for-sale securities		—				—				(12,304		)		—				(12,304		)
	Proceeds from sales of available-for-sale securities		—				—				3,627				—				3,627
	Proceeds from maturities and repayments of available-for-sale securities		—				—				5,509				—				5,509
	Net decrease (increase) in finance receivables and loans		4,898				79				(7,456		)		—				(2,479		)
	Net change in loans — intercompany		306				251				(1,503		)		946				—
	Net increase in operating lease assets		(1,320		)		—				(4,912		)		—				(6,232		)
	Capital contributions to subsidiaries		(477		)		—				—				477				—
	Returns of contributed capital		1,002				150				—				(1,152		)		—
	Sales of mortgage servicing rights		—				—				911				—				911
	Proceeds from sale of business units, net		1,799				554				5,091				—				7,444
	Net change in restricted cash		—				(26		)		(44		)		—				(70		)
	Other, net		41				—				10				—				51
	Net cash provided by (used in) investing activities		6,249				1,008				(11,071		)		271				(3,543		)
	Financing activities
	Net change in short-term borrowings — third party		131				36				1,424				—				1,591
	Net (decrease) increase in deposits		(543		)		—				5,879				39				5,375
	Proceeds from issuance of long-term debt — third party		3,236				—				24,076				—				27,312
	Repayments of long-term debt — third party		(9,468		)		(70		)		(22,354		)		—				(31,892		)
	Net change in debt — intercompany		1,803				(271		)		(629		)		(903		)		—
	Proceeds from issuance of common stock		1,270				—				—				—				1,270
	Repurchase of mandatorily convertible preferred stock held by U.S. Department of Treasury and elimination of share adjustment right		(5,925		)		—				—				—				(5,925		)
	Dividends paid — third party		(810		)		—				—				—				(810		)
	Dividends paid and returns of contributed capital — intercompany		—				(4,267		)		(6,275		)		10,542				—
	Capital contributions from parent		—				29				448				(477		)		—
	Net cash (used in) provided by financing activities		(10,306		)		(4,543		)		2,569				9,201				(3,079		)
	Effect of exchange-rate changes on cash and cash equivalents		—				—				45				—				45
	Net (decrease) increase in cash and cash equivalents		(1,042		)		37				(3,152		)		81				(4,076		)
	Adjustment for change in cash and cash equivalents of operations held-for-sale		—				—				2,094				—				2,094
	Cash and cash equivalents at beginning of year		3,972				—				4,032				(491		)		7,513
	Cash and cash equivalents at end of year		$	2,930			$	37			$	2,974			$	(410	)		$	5,531
	Year ended December 31, 2012 ($ in millions)		Parent				Guarantors				Nonguarantors				Consolidating				Ally
															adjustments				consolidated
	Operating activities
	Net cash provided by operating activities		$	102			$	306			$	5,862			$	(1,221	)		$	5,049
	Investing activities
	Purchases of available-for-sale securities		—				—				(12,816		)		—				(12,816		)
	Proceeds from sales of available-for-sale securities		—				—				7,662				—				7,662
	Proceeds from maturities and repayments of available-for-sale securities		—				—				5,673				—				5,673
	Net decrease (increase) in finance receivables and loans		3,027				2				(14,972		)		—				(11,943		)
	Proceeds from sales of finance receivables and loans		352				—				1,980				—				2,332
	Net change in loans — intercompany		3,879				105				129				(4,113		)		—
	Net increase in operating lease assets		(2,268		)		—				(3,431		)		—				(5,699		)
	Capital contributions to subsidiaries		(261		)		—				—				261				—
	Returns of contributed capital		2,079				—				—				(2,079		)		—
	Net cash effect from deconsolidation of ResCap		—				—				(539		)		—				(539		)
	Proceeds from sale of business units, net		29				—				487				—				516
	Net change in restricted cash		—				(13		)		(1,685		)		—				(1,698		)
	Other, net		(247		)		—				204				—				(43		)
	Net cash provided by (used in) investing activities		6,590				94				(17,308		)		(5,931		)		(16,555		)
	Financing activities
	Net change in short-term borrowings — third party		338				25				2,331				—				2,694
	Net (decrease) increase in deposits		(785		)		1				7,476				(39		)		6,653
	Proceeds from issuance of long-term debt — third party		3,613				70				35,718				—				39,401
	Repayments of long-term debt — third party		(11,238		)		(73		)		(28,598		)		—				(39,909		)
	Net change in debt — intercompany		(44		)		(149		)		(3,984		)		4,177				—
	Dividends paid — third party		(802		)		—				—				—				(802		)
	Dividends paid and returns of contributed capital — intercompany		—				(457		)		(2,843		)		3,300				—
Capital contributions from parent		—				169				92				(261		)		—
Net cash (used in) provided by financing activities		(8,918		)		(414		)		10,192				7,177				8,037
Effect of exchange-rate changes on cash and cash equivalents		(63		)		—				5				—				(58		)
Net decrease in cash and cash equivalents		(2,289		)		(14		)		(1,249		)		25				(3,527		)
Adjustment for change in cash and cash equivalents of operations held-for-sale		—				—				(1,995		)		—				(1,995		)
Cash and cash equivalents at beginning of year		6,261				14				7,276				(516		)		13,035
Cash and cash equivalents at end of year		$	3,972			$	—			$	4,032			$	(491	)		$	7,513
Year ended December 31, 2011 ($ in millions)	Parent				Guarantors				Nonguarantors				Consolidating				Ally
													adjustments				consolidated
Operating activities
Net cash provided by operating activities	$	2,695			$	209			$	3,973			$	(1,384	)		$	5,493
Investing activities
Purchases of available-for-sale securities	—				—				(19,377		)		—				(19,377		)
Proceeds from sales of available-for-sale securities	1,494				—				12,738				—				14,232
Proceeds from maturities and repayments of available-for-sale securities	1				—				4,964				—				4,965
Net increase in finance receivables and loans	(2,933		)		(51		)		(14,014		)		—				(16,998		)
Proceeds from sales of finance receivables and loans	1,346				—				1,522				—				2,868
Net change in loans — intercompany	2,743				11				(88		)		(2,666		)		—
Net (increase) decrease in operating lease assets	2,890				—				(3,901		)		—				(1,011		)
Capital contributions to subsidiaries	(1,634		)		(855		)		—				2,489				—
Returns of contributed capital	1,255				—				—				(1,255		)		—
Proceeds from sale of business unit, net	—				—				50				—				50
Net change in restricted cash	157				—				189				—				346
Other, net	(33		)		(1		)		831				—				797
Net cash provided by (used in) investing activities	5,286				(896		)		(17,086		)		(1,432		)		(14,128		)
Financing activities
Net change in short-term borrowings — third party	237				47				230				—				514
Net increase in deposits	308				—				5,766				—				6,074
Proceeds from issuance of long-term debt — third party	3,201				200				41,353				—				44,754
Repayments of long-term debt — third party	(9,414		)		(226		)		(30,833		)		—				(40,473		)
Net change in debt — intercompany	71				30				(2,755		)		2,654				—
Dividends paid — third party	(819		)		—				—				—				(819		)
Dividends paid and returns of contributed capital — intercompany	—				(207		)		(2,431		)		2,638				—
Capital contributions from parent	—				855				1,634				(2,489		)		—
Net cash (used in) provided by financing activities	(6,416		)		699				12,964				2,803				10,050
Effect of exchange-rate changes on cash and cash equivalents	31				—				18				—				49
Net increase (decrease) in cash and cash equivalents	1,596				12				(131		)		(13		)		1,464
Adjustment for change in cash and cash equivalents of operations held-for-sale	—				—				(99		)		—				(99		)
Cash and cash equivalents at beginning of year	4,665				2				7,506				(503		)		11,670
Cash and cash equivalents at end of year	$	6,261			$	14			$	7,276			$	(516	)		$	13,035

Guarantees_and_Commitments_Tab

Guarantees and Commitments (Tables)	12 Months Ended
	Dec. 31, 2013
Guarantees [Abstract]	'
Schedule of Guarantor Obligations [Table Text Block]	'
	Guarantees are defined as contracts or indemnification agreements that contingently require us to make payments to third parties based on changes in the underlying agreements with the guaranteed parties. The following summarizes our outstanding guarantees, including those of our discontinued operations, made to third parties on our Consolidated Balance Sheet, for the periods shown.
		2013				2012
	December 31, ($ in millions)	Maximum		Carrying value		Maximum		Carrying value
		liability		of liability		liability		of liability
	Default automotive repurchases	$	—	$	—	$	1,897	$	—
	Standby letters of credit and other guarantees	142		30		274		44
Financing Commitments [Table Text Block]	'
	The contractual commitments were as follows.
	December 31, ($ in millions)	2013		2012
	Commitments to
	Sell mortgages or securities (a)	$	—	$	6,282
	Originate/purchase mortgages or securities (a)	—		4,249
	Provide capital to investees (b)	63		86
	Provide retail automotive receivables to third-parties (c)	—		425
	Construction-lending commitments (d)	187		100
	Home equity lines of credit (e)	388		411
	Unused revolving credit line commitments (f)	1,062		668
	(a)	We have exited the mortgage origination and servicing business.
	(b)	We are committed to contribute capital to certain investees. The fair value of these commitments is considered in the overall valuation of the underlying assets with which they are associated.
	(c)	Certain of our discontinued international automotive financing businesses were committed to provide retail automotive receivables to third-party banks in exchange for secured debt. Those transactions did not meet the definition of a sale.
	(d)	The fair value of these commitments is considered in the overall valuation of the related assets.
	(e)	We are committed to fund the remaining unused balances on home equity lines of credit.
	(f)	The unused portion of revolving lines of credit reset at prevailing market rates and, as such, approximate market value.
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	'
	Future minimum rental payments required under operating leases, primarily for real property, with noncancelable lease terms expiring after December 31, 2013, are as follows.
	Year ended December 31, ($ in millions)
	2014	$	39
	2015	34
	2016	18
	2017	5
	2018	—
	2019 and thereafter	—
	Total minimum payment required	$	96
Long-term Purchase Commitment [Table Text Block]	'
	We have entered into multiple agreements for information technology, marketing and advertising, and voice and communication technology and maintenance. Many of the agreements are subject to variable price provisions, fixed or minimum price provisions, and termination or renewal provisions.
	Year ended December 31, ($ in millions)
	2014	$	76
	2015 and 2016	2
	Total future payment obligations	$	78

Quarterly_Financial_Statements

Quarterly Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Statements [Abstract]	'
Schedule of Quarterly Financial Information [Table Text Block]	'
	($ in millions)	First			Second			Third			Fourth
		quarter			quarter			quarter			quarter
	2013
	Net financing revenue	$	640		$	628		$	737		$	774
	Other revenue	386			402			371			325
	Total net revenue	1,026			1,030			1,108			1,099
	Provision for loan losses	131			89			141			140
	Total noninterest expense	958			801			762			884
	(Loss) income from continuing operations before income tax (benefit) expense	(63		)	140			205			75
	Income tax (benefit) expense from continuing operations	(123		)	40			28			(4		)
	Net income from continuing operations	60			100			177			79
	Income (loss) from discontinued operations, net of tax	1,033			(1,027		)	(86		)	25
	Net income (loss)	$	1,093		$	(927	)	$	91		$	104
	Basic earnings per common share
	Net loss from continuing operations	$	(105	)	$	(75	)	$	(18	)	$	(270	)
	Net income (loss)	671			(847		)	(82		)	(251		)
	Diluted earnings per common share
	Net loss from continuing operations	$	(105	)	$	(75	)	$	(18	)	$	(270	)
	Net income (loss)	671			(847		)	(82		)	(251		)
	2012
	Net financing revenue	$	351		$	457		$	472		$	611
	Other revenue	605			714			775			480
	Total net revenue	956			1,171			1,247			1,091
	Provision for loan losses	98			33			105			93
	Total noninterest expense	855			971			845			951
	Income from continuing operations before income tax expense (benefit)	3			167			297			47
	Income tax expense (benefit) from continuing operations	1			(16		)	46			(887		)
	Net income from continuing operations	2			183			251			934
	Income (loss) from discontinued operations, net of tax	308			(1,081		)	133			466
	Net income (loss)	$	310		$	(898	)	$	384		$	1,400
	Basic earnings per common share
	Net (loss) income from continuing operations	$	(149	)	$	(13	)	$	38		$	551
	Net income (loss)	82			(825		)	137			901
	Diluted earnings per common share
	Net (loss) income from continuing operations	$	(149	)	$	(13	)	$	38		$	455
	Net income (loss)	82			(825		)	137			700

Description_Of_Business_Basis_2

Description Of Business, Basis Of Presentation, And Changes In Significant Accounting Policies ResCap Bankruptcy Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2013	Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'	'	'
Impairment of Investment in ResCap	$442	'	'
ResCap settlement accrual	750	0	1,950
ResCap settlement accrual for insurance proceeds	$0	$150	'

Discontinued_and_Heldforsale_O2

Discontinued and Held-for-sale Operations (Selected Income Statement Information for Discontinued Operations) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Interest in Joint Venture	40.00%	'	'
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	$666	$28	$0
Mortgage Operations [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Total net (loss) revenue - Discontinued Operations	0	439	562
Pretax income (loss) including direct costs to transact a sale	-1,741	-1,282	-811
Tax (benefit) expense - Discontinued Operations	-592	-443	2
Insurance Operations [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Total net (loss) revenue - Discontinued Operations	190	625	710
Pretax income (loss) including direct costs to transact a sale	319	86	145
Tax (benefit) expense - Discontinued Operations	-14	53	39
Automotive finance operations [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Total net (loss) revenue - Discontinued Operations	572	1,503	1,690
Pretax income (loss) including direct costs to transact a sale	660	786	820
Tax (benefit) expense - Discontinued Operations	-101	235	92
Commercial Finance Operations [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Total net (loss) revenue - Discontinued Operations	0	11	7
Pretax income (loss) including direct costs to transact a sale	0	83	44
Tax (benefit) expense - Discontinued Operations	0	2	3
MEXICO	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	274	'	'
Europe and Latin America [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	-488	'	'
CANADA	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	$888	'	'

Discontinued_and_Heldforsale_O3

Discontinued and Held-for-sale Operations (Select Balance Sheet Information for Held-for-sale Operations) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
In Millions, unless otherwise specified
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'
Cash and Due from Banks	$1,315	$1,073	'	'	'
Interest-bearing Deposits in Banks and Other Financial Institutions	4,216	6,440	'	'	'
Total cash and cash equivalents	5,531	7,513	13,035	11,670	11,670
Available-for-sale Securities	17,083	14,178	'	'	'
Finance receivables and loans, net	100,328	99,055	'	'	'
Loans and Leases Receivable, Allowance	-1,208	-1,170	-1,503	'	'
Total finance receivables and loans, net	99,120	97,885	'	'	'
Investment in operating leases, net	17,680	13,550	'	'	'
Premiums receivable and other insurance assets	1,613	1,609	'	'	'
Other Assets	9,589	11,908	'	'	'
Total assets	151,167	182,347	184,059	'	'
Interest-bearing deposit liabilities	53,290	45,938	'	'	'
Short-term borrowings	8,545	7,461	'	'	'
Long-term debt	69,465	74,561	'	'	'
Interest payable	888	932	'	'	'
Unearned insurance premiums and service revenue	2,314	2,296	'	'	'
Accrued expenses and other liabilities	2,397	6,585	'	'	'
Total liabilities	136,959	162,449	'	'	'
Insurance Operations [Member]	'	'	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'
Cash and Due from Banks	'	8	'	'	'
Interest-bearing Deposits in Banks and Other Financial Institutions	'	119	'	'	'
Total cash and cash equivalents	'	127	'	'	'
Available-for-sale Securities	'	576	'	'	'
Finance receivables and loans, net	'	0	'	'	'
Loans and Leases Receivable, Allowance	'	0	'	'	'
Total finance receivables and loans, net	'	0	'	'	'
Investment in operating leases, net	'	0	'	'	'
Premiums receivable and other insurance assets	'	277	'	'	'
Other Assets	0	94	'	'	'
Impairment on assets of held-for-sale operations	'	-53	'	'	'
Total assets	0	1,021	'	'	'
Interest-bearing deposit liabilities	'	0	'	'	'
Short-term borrowings	'	0	'	'	'
Long-term debt	'	0	'	'	'
Interest payable	'	0	'	'	'
Unearned insurance premiums and service revenue	'	506	'	'	'
Accrued expenses and other liabilities	'	297	'	'	'
Total liabilities	'	803	'	'	'
Automotive finance operations [Member]	'	'	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'
Cash and Due from Banks	'	100	'	'	'
Interest-bearing Deposits in Banks and Other Financial Institutions	'	1,918	'	'	'
Total cash and cash equivalents	'	2,018	'	'	'
Available-for-sale Securities	'	424	'	'	'
Finance receivables and loans, net	'	25,835	'	'	'
Loans and Leases Receivable, Allowance	'	-208	'	'	'
Total finance receivables and loans, net	'	25,627	'	'	'
Investment in operating leases, net	'	144	'	'	'
Premiums receivable and other insurance assets	'	0	'	'	'
Other Assets	516	2,942	'	'	'
Impairment on assets of held-for-sale operations	'	0	'	'	'
Total assets	516	31,155	'	'	'
Interest-bearing deposit liabilities	'	3,907	'	'	'
Short-term borrowings	'	2,800	'	'	'
Long-term debt	'	13,514	'	'	'
Interest payable	'	177	'	'	'
Unearned insurance premiums and service revenue	'	0	'	'	'
Accrued expenses and other liabilities	'	1,498	'	'	'
Total liabilities	'	21,896	'	'	'
Discontinued Operation Or Assets Disposal [Member]	'	'	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'
Cash and Due from Banks	'	108	'	'	'
Interest-bearing Deposits in Banks and Other Financial Institutions	'	2,037	'	'	'
Total cash and cash equivalents	'	2,145	'	'	'
Available-for-sale Securities	'	1,000	'	'	'
Finance receivables and loans, net	'	25,835	'	'	'
Loans and Leases Receivable, Allowance	'	-208	'	'	'
Total finance receivables and loans, net	'	25,627	'	'	'
Investment in operating leases, net	'	144	'	'	'
Premiums receivable and other insurance assets	'	277	'	'	'
Other Assets	516	3,036	'	'	'
Impairment on assets of held-for-sale operations	'	-53	'	'	'
Total assets	516	32,176	'	'	'
Interest-bearing deposit liabilities	'	3,907	'	'	'
Short-term borrowings	'	2,800	'	'	'
Long-term debt	'	13,514	'	'	'
Interest payable	'	177	'	'	'
Unearned insurance premiums and service revenue	'	506	'	'	'
Accrued expenses and other liabilities	'	1,795	'	'	'
Total liabilities	'	$22,699	'	'	'

Insurance_Premiums_and_Service2

Insurance Premiums and Service Revenue Earned (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Premiums Written and Earned [Abstract]	'	'	'
Direct Premiums Written, Property and Casualty	$270	$332	$342
Direct Premiums Earned, Property and Casualty	305	335	309
Assumed Premiums Written, Property and Casualty	61	44	38
Assumed Premiums Earned, Property and Casualty	58	49	76
Premiums Written, Gross	331	376	380
Gross Insurance Premiums Earned	363	384	385
Ceded Premiums Written, Property and Casualty	-172	-141	-129
Ceded Premiums Earned, Property and Casualty	-120	-109	-126
Premiums Written, Net, Property and Casualty	159	235	251
Premiums Earned, Net, Property and Casualty	243	275	259
Insurance Commissions and Fees Written	838	826	788
Insurance Commissions and Fees	769	780	894
Insurance Services Revenue Written	997	1,061	1,039
Insurance premiums and service revenue earned	$1,012	$1,055	$1,153

Other_Income_Net_Of_Losses_Oth

Other Income, Net Of Losses (Other Income, Net Of Losses) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Nonoperating Income (Expense) [Abstract]	'	'	'
Fees and Commissions, Other	$94	$83	$82
Remarketing Fees	82	63	96
Fees and Commissions, Mortgage Banking	81	475	236
Unrealized Gain (Loss) on Derivatives	24	-30	-125
Other Securitization Income Loss	23	45	199
Other Income	79	101	133
Other income, net of losses	$383	$737	$621

Other_Operating_Expenses_Detai

Other Operating Expenses (Details Of Other Operating Expenses) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Expenses [Abstract]	'	'	'
Insurance Commissions	$370	$382	$431
Communications and Information Technology	346	317	342
Professional Fees	176	149	171
Lease and loan administration	173	325	201
Marketing and Advertising Expense	136	145	150
Regulatory and licensing fees	116	118	124
Legal Fees	105	6	2
Mortgage Representation And Warranty, Net	104	171	0
Depreciation, Nonproduction	81	76	70
Vehicle remarketing and repossession	60	52	84
Occupancy, Net	44	50	47
Other Cost and Expense, Operating	270	271	361
Total other operating expenses	1,981	2,062	1,983
CFPB Settlement	$98	'	'

Investment_Securities_Schedule

Investment Securities (Schedule of Available-for-sale Securities Reconciliation) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Amortized Cost Basis	$17,425,000,000	$13,997,000,000
Available-for-sale Securities, Gross Unrealized Gains	166,000,000	262,000,000
Available-for-sale Securities, Gross Unrealized Losses	-508,000,000	-81,000,000
Available-for-sale Securities	17,083,000,000	14,178,000,000
Total agency backed bonds	8,266,000,000	4,983,000,000
Deposit Assets	15,000,000	15,000,000
Cash Equivalents, at Carrying Value	2,400,000,000	3,400,000,000
Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities, Amortized Cost Basis	16,527,000,000	12,804,000,000
Available-for-sale Debt Securities Gross Unrealized Gain	92,000,000	230,000,000
Available-for-sale Debt Securities, Gross Unrealized Loss	-480,000,000	-8,000,000
Available-for-sale Securities, Debt Securities	16,139,000,000	13,026,000,000
US Treasury and Government [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities, Amortized Cost Basis	1,495,000,000	2,212,000,000
Available-for-sale Debt Securities Gross Unrealized Gain	1,000,000	3,000,000
Available-for-sale Debt Securities, Gross Unrealized Loss	-69,000,000	-1,000,000
Available-for-sale Securities, Debt Securities	1,427,000,000	2,214,000,000
US States and Political Subdivisions Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities, Amortized Cost Basis	316,000,000	0
Available-for-sale Debt Securities Gross Unrealized Gain	0	0
Available-for-sale Debt Securities, Gross Unrealized Loss	-1,000,000	0
Available-for-sale Securities, Debt Securities	315,000,000	0
Foreign Government Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities, Amortized Cost Basis	287,000,000	295,000,000
Available-for-sale Debt Securities Gross Unrealized Gain	4,000,000	8,000,000
Available-for-sale Debt Securities, Gross Unrealized Loss	-3,000,000	0
Available-for-sale Securities, Debt Securities	288,000,000	303,000,000
Residential Mortgage Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities, Amortized Cost Basis	11,131,000,000	6,779,000,000
Available-for-sale Debt Securities Gross Unrealized Gain	49,000,000	130,000,000
Available-for-sale Debt Securities, Gross Unrealized Loss	-398,000,000	-3,000,000
Available-for-sale Securities, Debt Securities	10,782,000,000	6,906,000,000
Commercial Mortgage Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities, Amortized Cost Basis	39,000,000	0
Available-for-sale Debt Securities Gross Unrealized Gain	0	0
Available-for-sale Debt Securities, Gross Unrealized Loss	0	0
Available-for-sale Securities, Debt Securities	39,000,000	0
Asset-backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities, Amortized Cost Basis	2,207,000,000	2,309,000,000
Available-for-sale Debt Securities Gross Unrealized Gain	15,000,000	32,000,000
Available-for-sale Debt Securities, Gross Unrealized Loss	-3,000,000	-1,000,000
Available-for-sale Securities, Debt Securities	2,219,000,000	2,340,000,000
Corporate Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities, Amortized Cost Basis	1,052,000,000	1,209,000,000
Available-for-sale Debt Securities Gross Unrealized Gain	23,000,000	57,000,000
Available-for-sale Debt Securities, Gross Unrealized Loss	-6,000,000	-3,000,000
Available-for-sale Securities, Debt Securities	1,069,000,000	1,263,000,000
Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Equity Securities, Amortized Cost Basis	898,000,000	1,193,000,000
Available-for-sale Equity Securities, Gross Unrealized Gain	74,000,000	32,000,000
Available-for-sale Equity Securities, Gross Unrealized Loss	-28,000,000	-73,000,000
Available-for-sale Securities, Equity Securities	$944,000,000	$1,152,000,000

Investment_Securities_Investme

Investment Securities (Investments Classified by Contractual Maturity Date) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized cost of available-for-sale debt securities, Due in one year or less, Amount	$165	$431
Amortized cost of available-for-sale debt securities, Due after one year through five years, Amount	3,000	2,880
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis	1,882	2,369
Amortized cost of available-for-sale debt securities, Due after ten years, Amount	11,480	7,124
Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale debt securities, Due in one year or less, Amount	166	432
Available-for-sale debt securities, Due after one year through five years, Amount	3,001	2,921
Available-for-sale debt securities, Due after five years through ten years, Amount	1,842	2,417
Available-for-sale debt securities, Due after ten years, Amount	11,130	7,256
Available-for-sale debt securities, Yield	2.50%	2.40%
Available-for-sale debt securities, Due in one year or less, Yield	2.30%	0.10%
Available-for-sale debt securities, Due after one year through five years, Yield	1.90%	2.00%
Available-for-sale debt securities, Due after five years through ten years, Yield	2.50%	2.60%
Available-for-sale debt securities, Due after ten years, Yield	2.70%	2.60%
Available-for-sale Securities, Debt Securities	16,139	13,026
Available-for-sale Debt Securities, Amortized Cost Basis	16,527	12,804
US Treasury and Government [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale debt securities, Due in one year or less, Amount	9	422
Available-for-sale debt securities, Due after one year through five years, Amount	766	682
Available-for-sale debt securities, Due after five years through ten years, Amount	652	1,110
Available-for-sale debt securities, Due after ten years, Amount	0	0
Available-for-sale debt securities, Yield	1.30%	0.90%
Available-for-sale debt securities, Due in one year or less, Yield	3.00%	0.00%
Available-for-sale debt securities, Due after one year through five years, Yield	1.20%	0.70%
Available-for-sale debt securities, Due after five years through ten years, Yield	1.30%	1.40%
Available-for-sale debt securities, Due after ten years, Yield	0.00%	0.00%
Available-for-sale Securities, Debt Securities	1,427	2,214
Available-for-sale Debt Securities, Amortized Cost Basis	1,495	2,212
US States and Political Subdivisions Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale debt securities, Due in one year or less, Amount	39	'
Available-for-sale debt securities, Due after one year through five years, Amount	10	'
Available-for-sale debt securities, Due after five years through ten years, Amount	102	'
Available-for-sale debt securities, Due after ten years, Amount	164	'
Available-for-sale debt securities, Yield	3.30%	'
Available-for-sale debt securities, Due in one year or less, Yield	1.30%	'
Available-for-sale debt securities, Due after one year through five years, Yield	0.60%	'
Available-for-sale debt securities, Due after five years through ten years, Yield	2.60%	'
Available-for-sale debt securities, Due after ten years, Yield	4.30%	'
Available-for-sale Securities, Debt Securities	315	0
Available-for-sale Debt Securities, Amortized Cost Basis	316	0
Foreign Government Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale debt securities, Due in one year or less, Amount	18	1
Available-for-sale debt securities, Due after one year through five years, Amount	105	136
Available-for-sale debt securities, Due after five years through ten years, Amount	164	166
Available-for-sale debt securities, Due after ten years, Amount	1	0
Available-for-sale debt securities, Yield	2.70%	2.50%
Available-for-sale debt securities, Due in one year or less, Yield	2.70%	2.20%
Available-for-sale debt securities, Due after one year through five years, Yield	2.40%	1.80%
Available-for-sale debt securities, Due after five years through ten years, Yield	2.90%	3.00%
Available-for-sale debt securities, Due after ten years, Yield	2.70%	0.00%
Available-for-sale Securities, Debt Securities	288	303
Available-for-sale Debt Securities, Amortized Cost Basis	287	295
Residential Mortgage Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale debt securities, Due in one year or less, Amount	0	0
Available-for-sale debt securities, Due after one year through five years, Amount	90	0
Available-for-sale debt securities, Due after five years through ten years, Amount	3	35
Available-for-sale debt securities, Due after ten years, Amount	10,689	6,871
Available-for-sale debt securities, Yield	2.70%	2.70%
Available-for-sale debt securities, Due in one year or less, Yield	0.00%	0.00%
Available-for-sale debt securities, Due after one year through five years, Yield	2.10%	0.00%
Available-for-sale debt securities, Due after five years through ten years, Yield	4.20%	4.30%
Available-for-sale debt securities, Due after ten years, Yield	2.70%	2.70%
Available-for-sale Securities, Debt Securities	10,782	6,906
Available-for-sale Debt Securities, Amortized Cost Basis	11,131	6,779
Commercial Mortgage Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale debt securities, Due in one year or less, Amount	0	'
Available-for-sale debt securities, Due after one year through five years, Amount	0	'
Available-for-sale debt securities, Due after five years through ten years, Amount	0	'
Available-for-sale debt securities, Due after ten years, Amount	39	'
Available-for-sale debt securities, Yield	1.30%	'
Available-for-sale debt securities, Due in one year or less, Yield	0.00%	'
Available-for-sale debt securities, Due after one year through five years, Yield	0.00%	'
Available-for-sale debt securities, Due after five years through ten years, Yield	0.00%	'
Available-for-sale debt securities, Due after ten years, Yield	1.30%	'
Available-for-sale Securities, Debt Securities	39	0
Available-for-sale Debt Securities, Amortized Cost Basis	39	0
Asset-backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale debt securities, Due in one year or less, Amount	76	0
Available-for-sale debt securities, Due after one year through five years, Amount	1,483	1,543
Available-for-sale debt securities, Due after five years through ten years, Amount	491	510
Available-for-sale debt securities, Due after ten years, Amount	169	287
Available-for-sale debt securities, Yield	2.00%	2.10%
Available-for-sale debt securities, Due in one year or less, Yield	2.40%	0.00%
Available-for-sale debt securities, Due after one year through five years, Yield	1.90%	2.00%
Available-for-sale debt securities, Due after five years through ten years, Yield	1.90%	1.70%
Available-for-sale debt securities, Due after ten years, Yield	2.70%	3.30%
Available-for-sale Securities, Debt Securities	2,219	2,340
Available-for-sale Debt Securities, Amortized Cost Basis	2,207	2,309
Corporate Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale debt securities, Due in one year or less, Amount	24	9
Available-for-sale debt securities, Due after one year through five years, Amount	547	560
Available-for-sale debt securities, Due after five years through ten years, Amount	430	596
Available-for-sale debt securities, Due after ten years, Amount	68	98
Available-for-sale debt securities, Yield	4.10%	5.10%
Available-for-sale debt securities, Due in one year or less, Yield	3.40%	3.20%
Available-for-sale debt securities, Due after one year through five years, Yield	3.00%	4.00%
Available-for-sale debt securities, Due after five years through ten years, Yield	5.30%	6.00%
Available-for-sale debt securities, Due after ten years, Yield	5.70%	5.80%
Available-for-sale Securities, Debt Securities	1,069	1,263
Available-for-sale Debt Securities, Amortized Cost Basis	$1,052	$1,209

Investment_Securities_Schedule1

Investment Securities (Schedule Of Realized Gain (Loss)) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Available-for-sale Securities [Abstract]	'	'	'
Available-for-sale Securities, Gross Realized Gains	$221	$241	$297
Available-for-sale Securities, Gross Realized Losses	-21	-34	-28
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	-20	-61	-11
Other gain (loss) on investments, net	$180	$146	$258

Investment_Securities_Investme1

Investment Securities (Investment Income) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Available-for-sale Securities [Abstract]	'	'	'
Taxable interest	$297	$262	$325
Taxable dividends	25	30	25
Interest and dividends exempt from U.S. federal income tax	3	0	0
Interest and dividends on available-for-sale investment securities	$325	$292	$350

Investment_Securities_Schedule2

Investment Securities (Schedule of Unrealized Loss on Investments) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Fair value Less than 12 months	$10,118	$1,391
Available-for-sale Securities, Unrealized Loss Less than 12 months	-482	-45
Available-for-sale Securities, Fair value 12 months or longer	204	257
Available-for-sale Securities, Unrealized Loss 12 months or longer	-26	-36
Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Fair value Less than 12 months	9,951	1,011
Available-for-sale Securities, Unrealized Loss Less than 12 months	-470	-6
Available-for-sale Securities, Fair value 12 months or longer	104	39
Available-for-sale Securities, Unrealized Loss 12 months or longer	-10	-2
US Treasury and Government [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Fair value Less than 12 months	1,405	244
Available-for-sale Securities, Unrealized Loss Less than 12 months	-69	-1
Available-for-sale Securities, Fair value 12 months or longer	0	0
Available-for-sale Securities, Unrealized Loss 12 months or longer	0	0
US States and Political Subdivisions Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Fair value Less than 12 months	212	0
Available-for-sale Securities, Unrealized Loss Less than 12 months	-1	0
Available-for-sale Securities, Fair value 12 months or longer	0	0
Available-for-sale Securities, Unrealized Loss 12 months or longer	0	0
Foreign Government Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Fair value Less than 12 months	114	11
Available-for-sale Securities, Unrealized Loss Less than 12 months	-3	0
Available-for-sale Securities, Fair value 12 months or longer	0	0
Available-for-sale Securities, Unrealized Loss 12 months or longer	0	0
Residential Mortgage Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Fair value Less than 12 months	7,503	493
Available-for-sale Securities, Unrealized Loss Less than 12 months	-388	-2
Available-for-sale Securities, Fair value 12 months or longer	100	23
Available-for-sale Securities, Unrealized Loss 12 months or longer	-10	-1
Asset-backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Fair value Less than 12 months	407	143
Available-for-sale Securities, Unrealized Loss Less than 12 months	-3	-1
Available-for-sale Securities, Fair value 12 months or longer	1	1
Available-for-sale Securities, Unrealized Loss 12 months or longer	0	0
Corporate Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Fair value Less than 12 months	310	120
Available-for-sale Securities, Unrealized Loss Less than 12 months	-6	-2
Available-for-sale Securities, Fair value 12 months or longer	3	15
Available-for-sale Securities, Unrealized Loss 12 months or longer	0	-1
Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Fair value Less than 12 months	167	380
Available-for-sale Securities, Unrealized Loss Less than 12 months	-12	-39
Available-for-sale Securities, Fair value 12 months or longer	100	218
Available-for-sale Securities, Unrealized Loss 12 months or longer	($16)	($34)

Finance_Receivables_And_Loans_2

Finance Receivables And Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Finance receivables and loans, net	$100,328,000,000	$99,055,000,000	'
Interest and Fee Income, Loans and Leases	4,529,000,000	4,539,000,000	4,189,000,000
Held For Investment Mortgage Finance Receivables Interest Only Mortgage Loans	1,500,000,000	2,100,000,000	'
Loans Receivable, Fair Value Disclosure	1,000,000	0	'
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	595,000,000	895,000,000	'
Consumer Loans Auto Financing Receivable [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Finance receivables and loans, net	56,417,000,000	53,715,000,000	'
Residential Mortgage [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Finance receivables and loans, net	'	9,821,000,000	'
Commercial Loan [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Finance receivables and loans, net	35,467,000,000	35,519,000,000	'
Commercial And Industrial Automobile [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Finance receivables and loans, net	30,948,000,000	30,270,000,000	'
Commercial And Industrial Mortgage [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Finance receivables and loans, net	0	0	'
Commercial And Industrial Other [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Finance receivables and loans, net	1,664,000,000	2,697,000,000	'
Commercial Real Estate Automobile [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Finance receivables and loans, net	2,855,000,000	2,552,000,000	'
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Gain (Loss) Recognized in Earnings on Hedged Item [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Interest and Fee Income, Loans and Leases	2,000,000	0	0
Fair Value Option Election, Fair Value [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Finance receivables and loans, net	100,328,000,000	'	'
Fair Value Option Election, Fair Value [Member] | Residential Mortgage [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Finance receivables and loans, net	8,444,000,000	'	'
Fair Value Option Election, Fair Value [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Gain (Loss) Recognized in Earnings on Hedged Item [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Interest and Fee Income, Loans and Leases	$1,000,000	'	'

Finance_Receivables_And_Loans_3

Finance Receivables And Loans, Net (Allowance For Credit Losses On Financing Receivables) (Details) (USD $)	12 Months Ended								3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2012
			Consumer Loans Auto Financing Receivable [Member]	Consumer Loans Auto Financing Receivable [Member]	Residential Mortgage [Member]	Residential Mortgage [Member]	Commercial Loan [Member]	Commercial Loan [Member]	Discontinued Operations [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'	'	'	'
Loans and Leases Receivable, Allowance, Beginning Balance	$1,170	$1,503	$575	$766	$452	$516	$143	$221	'
Allowance for Loan and Lease Losses, Write-offs	-737	-776	-639	-616	-93	-149	-5	-11	'
Allowance for Loan and Lease Loss, Recovery of Bad Debts	265	302	237	247	18	11	10	44	'
Allowance for Loan and Lease Losses Write-offs, Net	-472	-474	-402	-369	-75	-138	5	33	'
Provision for Loan and Lease Losses	501	329	490	257	13	86	-2	-14	'
Allowance for Loan and Lease Losses, Adjustments, Net	9	-188	10	-79	-1	-12	0	-97	65
Loans and Leases Receivable, Allowance, Ending Balance	1,208	1,170	673	575	389	452	146	143	'
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]	'	'	'	'	'	'	'	'	'
Allowance for loan losses, Individually evaluated for impairment	248	228	23	16	199	186	26	26	'
Allowance for loan losses, Collectively evaluated for impairment	960	939	650	556	190	266	120	117	'
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	3	0	3	0	0	0	0	'
Finance receivables and loans, net	100,328	99,055	56,417	53,715	8,443	9,821	35,467	35,519	'
Loans and Leases Receivable, Gross, Excluding Fair Value Option Election	100,327	'	'	'	'	'	'	'	'
Financing Receivable, Individually Evaluated for Impairment	1,404	2,671	281	260	919	873	204	1,538	'
Financing receivable, Collectively evaluated for impairment	98,915	96,354	56,128	53,425	7,524	8,948	35,263	33,981	'
Financing receivable, Loans acquired with deteriorated credit quality	$8	$30	$8	$30	$0	$0	$0	$0	'

Finance_Receivables_And_Loans_4

Finance Receivables And Loans, Net (Schedule Of Sales Of Financing Receivables And Loans) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Sales	$65	$2,096
Consumer Loans Auto Financing Receivable [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Sales	0	1,960
Residential Mortgage [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Sales	0	40
Commercial Loan [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Sales	$65	$96

Finance_Receivables_And_Loans_5

Finance Receivables And Loans, Net (Past Due Financing Receivables And Loans) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 days past due	$1,227	$1,001
60 - 89 days past due	286	256
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	323	337
Total past due	1,836	1,594
Current	98,491	97,461
Loans and Leases Receivable, Gross, Excluding Fair Value Option Election	100,327	'
Finance receivables and loans, net	100,328	99,055
Consumer Loans Auto Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 days past due	1,145	920
60 - 89 days past due	255	213
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	157	138
Total past due	1,557	1,271
Current	54,860	52,444
Finance receivables and loans, net	56,417	53,715
Residential Mortgage [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 days past due	82	81
60 - 89 days past due	31	43
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	124	174
Total past due	237	298
Current	8,206	9,523
Loans and Leases Receivable, Gross, Excluding Fair Value Option Election	8,443	'
Finance receivables and loans, net	'	9,821
Commercial Loan [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 days past due	0	0
60 - 89 days past due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	42	25
Total past due	42	25
Current	35,425	35,494
Finance receivables and loans, net	35,467	35,519
Commercial And Industrial Automobile [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 days past due	0	0
60 - 89 days past due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	36	16
Total past due	36	16
Current	30,912	30,254
Finance receivables and loans, net	30,948	30,270
Commercial And Industrial Mortgage [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 days past due	0	0
60 - 89 days past due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total past due	0	0
Current	0	0
Finance receivables and loans, net	0	0
Commercial And Industrial Other [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 days past due	0	0
60 - 89 days past due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	1
Total past due	0	1
Current	1,664	2,696
Finance receivables and loans, net	1,664	2,697
Commercial Real Estate Automobile [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 days past due	0	0
60 - 89 days past due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	6	8
Total past due	6	8
Current	2,849	2,544
Finance receivables and loans, net	$2,855	$2,552

Finance_Receivables_And_Loans_6

Finance Receivables And Loans, Net (Schedule of Financing Receivables, Non Accrual Status) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Finance receivables and loans on nonaccrual status	$725	$858
Consumer Loans Auto Financing Receivable [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Finance receivables and loans on nonaccrual status	329	260
Residential Mortgage [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Finance receivables and loans on nonaccrual status	192	382
Commercial Loan [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Finance receivables and loans on nonaccrual status	204	216
Commercial And Industrial Automobile [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Finance receivables and loans on nonaccrual status	116	146
Commercial And Industrial Mortgage [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Finance receivables and loans on nonaccrual status	0	0
Commercial And Industrial Other [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Finance receivables and loans on nonaccrual status	74	33
Commercial Real Estate Automobile [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Finance receivables and loans on nonaccrual status	$14	$37

Finance_Receivables_And_Loans_7

Finance Receivables And Loans, Net (Financing Receivable Credit Quality Indicators) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	$100,328	$99,055
Loans and Leases Receivable, Gross, Excluding Fair Value Option Election	100,327	'
Consumer Loans Auto Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	56,417	53,715
Residential Mortgage [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	'	9,821
Loans and Leases Receivable, Gross, Excluding Fair Value Option Election	8,443	'
Performing Financing Receivable [Member] | Consumer Loans Auto Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	56,088	53,455
Performing Financing Receivable [Member] | Residential Mortgage [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	8,251	9,439
Nonperforming Financing Receivable [Member] | Consumer Loans Auto Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	329	260
Nonperforming Financing Receivable [Member] | Residential Mortgage [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	$192	$382

Finance_Receivables_And_Loans_8

Finance Receivables And Loans, Net (Schedule Of Pass And Criticized Credit Quality Indicators Of Finance Receivables) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	$100,328	$99,055
Commercial Loan [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	35,467	35,519
Commercial And Industrial Automobile [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	30,948	30,270
Commercial And Industrial Mortgage [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	0	0
Commercial And Industrial Other [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	1,664	2,697
Commercial Real Estate Automobile [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	2,855	2,552
Pass [Member] | Commercial Loan [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	33,352	33,835
Pass [Member] | Commercial And Industrial Automobile [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	29,194	28,978
Pass [Member] | Commercial And Industrial Mortgage [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	0	0
Pass [Member] | Commercial And Industrial Other [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	1,388	2,417
Pass [Member] | Commercial Real Estate Automobile [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	2,770	2,440
Criticized Member | Commercial Loan [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	2,115	1,684
Criticized Member | Commercial And Industrial Automobile [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	1,754	1,292
Criticized Member | Commercial And Industrial Mortgage [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	0	0
Criticized Member | Commercial And Industrial Other [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	276	280
Criticized Member | Commercial Real Estate Automobile [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Finance receivables and loans, net	$85	$112

Finance_Receivables_And_Loans_9

Finance Receivables And Loans, Net (Impaired Financing Receivables) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, Unpaid Principal Balance	$1,409	$1,434
Carrying value before allowance	1,404	1,349
Impaired Financing Receivable, Related Allowance	248	228
Consumer Loans Auto Financing Receivable [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, Unpaid Principal Balance	281	260
Carrying value before allowance	281	260
Impaired Financing Receivable, Related Allowance	23	16
Residential Mortgage [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, Unpaid Principal Balance	924	958
Carrying value before allowance	919	873
Impaired Financing Receivable, Related Allowance	199	186
Commercial Loan [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, Unpaid Principal Balance	204	216
Carrying value before allowance	204	216
Impaired Financing Receivable, Related Allowance	26	26
Commercial And Industrial Automobile [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, Unpaid Principal Balance	116	146
Carrying value before allowance	116	146
Impaired Financing Receivable, Related Allowance	7	7
Commercial And Industrial Mortgage [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, Unpaid Principal Balance	0	0
Carrying value before allowance	0	0
Impaired Financing Receivable, Related Allowance	0	0
Commercial And Industrial Other [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, Unpaid Principal Balance	74	33
Carrying value before allowance	74	33
Impaired Financing Receivable, Related Allowance	16	7
Commercial Real Estate Automobile [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, Unpaid Principal Balance	14	37
Carrying value before allowance	14	37
Impaired Financing Receivable, Related Allowance	3	12
Impaired With No Allowance Member	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	194	286
Impaired With No Allowance Member | Consumer Loans Auto Financing Receivable [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	0	90
Impaired With No Allowance Member | Residential Mortgage [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	128	124
Impaired With No Allowance Member | Commercial Loan [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	66	72
Impaired With No Allowance Member | Commercial And Industrial Automobile [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	57	54
Impaired With No Allowance Member | Commercial And Industrial Mortgage [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	0	0
Impaired With No Allowance Member | Commercial And Industrial Other [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	0	9
Impaired With No Allowance Member | Commercial Real Estate Automobile [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	9	9
Impaired With Allowance Member	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	1,210	1,063
Impaired With Allowance Member | Consumer Loans Auto Financing Receivable [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	281	170
Impaired With Allowance Member | Residential Mortgage [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	791	749
Impaired With Allowance Member | Commercial Loan [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	138	144
Impaired With Allowance Member | Commercial And Industrial Automobile [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	59	92
Impaired With Allowance Member | Commercial And Industrial Mortgage [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	0	0
Impaired With Allowance Member | Commercial And Industrial Other [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	74	24
Impaired With Allowance Member | Commercial Real Estate Automobile [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Carrying value before allowance	$5	$28

Recovered_Sheet1

Finance Receivables And Loans, Net (Average Balance And Interest Income Of Impaired Finance Receivables) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]	'	'	'
Impaired Financing Receivable, Average Recorded Investment	$1,439	$1,109	$1,160
Impaired Financing Receivable, Interest Income, Accrual Method	56	55	58
Consumer Loans Auto Financing Receivable [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Impaired Financing Receivable, Average Recorded Investment	278	131	35
Impaired Financing Receivable, Interest Income, Accrual Method	18	12	2
Residential Mortgage [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Impaired Financing Receivable, Average Recorded Investment	908	693	553
Impaired Financing Receivable, Interest Income, Accrual Method	29	28	22
Commercial Loan [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Impaired Financing Receivable, Average Recorded Investment	253	285	572
Impaired Financing Receivable, Interest Income, Accrual Method	9	15	34
Commercial And Industrial Automobile [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Impaired Financing Receivable, Average Recorded Investment	152	178	303
Impaired Financing Receivable, Interest Income, Accrual Method	6	8	19
Commercial And Industrial Mortgage [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Impaired Financing Receivable, Average Recorded Investment	0	5	19
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	6
Commercial And Industrial Other [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Impaired Financing Receivable, Average Recorded Investment	72	32	84
Impaired Financing Receivable, Interest Income, Accrual Method	2	6	1
Commercial Real Estate Automobile [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Impaired Financing Receivable, Average Recorded Investment	29	64	126
Impaired Financing Receivable, Interest Income, Accrual Method	1	1	7
Commercial Real Estate Mortgage [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Impaired Financing Receivable, Average Recorded Investment	0	6	40
Impaired Financing Receivable, Interest Income, Accrual Method	$0	$0	$1

Recovered_Sheet2

Finance Receivables And Loans, Net Finance Receivables and Loans, Net (Troubled Debt Restructurings) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	20,497	39,271
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$712,000,000	$872,000,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	618,000,000	673,000,000
Financing Receivable, Modifications, Recorded Investment	1,300,000,000	'
Total TDR movement during the period	112,000,000	'
Loans and Leases Receivable, Impaired, Commitment to Lend	26,000,000	25,000,000
Consumer Loans Auto Financing Receivable [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	19,388	36,285
Financing Receivable, Modifications, Pre-Modification Recorded Investment	297,000,000	407,000,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	249,000,000	295,000,000
Residential Mortgage [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	1,092	2,969
Financing Receivable, Modifications, Pre-Modification Recorded Investment	278,000,000	436,000,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	234,000,000	350,000,000
Commercial Loan [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	17	17
Financing Receivable, Modifications, Pre-Modification Recorded Investment	137,000,000	29,000,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	135,000,000	28,000,000
Commercial And Industrial Automobile [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	8	9
Financing Receivable, Modifications, Pre-Modification Recorded Investment	37,000,000	15,000,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	37,000,000	15,000,000
Commercial And Industrial Mortgage [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Commercial And Industrial Other [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	4	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	80,000,000	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	78,000,000	0
Commercial Real Estate Automobile [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	5	8
Financing Receivable, Modifications, Pre-Modification Recorded Investment	20,000,000	14,000,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	$20,000,000	$13,000,000

Recovered_Sheet3

Finance Receivables And Loans, Net (Redefaults) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	20,497	39,271
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$712	$872
Financing Receivable, Modifications, Post-Modification Recorded Investment	618	673
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	6,070	2,450
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	83	51
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	38	15
Consumer Loans Auto Financing Receivable [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	19,388	36,285
Financing Receivable, Modifications, Pre-Modification Recorded Investment	297	407
Financing Receivable, Modifications, Post-Modification Recorded Investment	249	295
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	6,038	2,290
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	75	26
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	37	12
Residential Mortgage [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	1,092	2,969
Financing Receivable, Modifications, Pre-Modification Recorded Investment	278	436
Financing Receivable, Modifications, Post-Modification Recorded Investment	234	350
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	32	153
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	8	19
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	1	3
Commercial Loan [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	17	17
Financing Receivable, Modifications, Pre-Modification Recorded Investment	137	29
Financing Receivable, Modifications, Post-Modification Recorded Investment	135	28
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	7
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	6
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Commercial And Industrial Automobile [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	8	9
Financing Receivable, Modifications, Pre-Modification Recorded Investment	37	15
Financing Receivable, Modifications, Post-Modification Recorded Investment	37	15
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	3
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Commercial And Industrial Mortgage [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Commercial And Industrial Other [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	4	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	80	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	78	0
Commercial Real Estate Automobile [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	5	8
Financing Receivable, Modifications, Pre-Modification Recorded Investment	20	14
Financing Receivable, Modifications, Post-Modification Recorded Investment	20	13
Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	3
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$0	$0

Recovered_Sheet4

Finance Receivables And Loans, Net (Consumer Concentration Risk by State and Foreign Geographic Region) (Details)	Dec. 31, 2013	Dec. 31, 2012
Texas and California [Member]	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	21.10%	'
Consumer Loans Auto Financing Receivable [Member]	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	100.00%	100.00%
Consumer Loans Auto Financing Receivable [Member] | TEXAS	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	13.20%	12.90%
Consumer Loans Auto Financing Receivable [Member] | CALIFORNIA	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	5.80%	5.60%
Consumer Loans Auto Financing Receivable [Member] | FLORIDA	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	7.00%	6.70%
Consumer Loans Auto Financing Receivable [Member] | PENNSYLVANIA	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	5.30%	5.20%
Consumer Loans Auto Financing Receivable [Member] | ILLINOIS	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	4.40%	4.30%
Consumer Loans Auto Financing Receivable [Member] | MICHIGAN	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	4.40%	5.00%
Consumer Loans Auto Financing Receivable [Member] | NEW YORK	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	4.30%	4.60%
Consumer Loans Auto Financing Receivable [Member] | GEORGIA	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	4.00%	3.70%
Consumer Loans Auto Financing Receivable [Member] | OHIO	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	4.00%	4.00%
Consumer Loans Auto Financing Receivable [Member] | NORTH CAROLINA	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	3.40%	3.30%
Consumer Loans Auto Financing Receivable [Member] | Other United States [Member]	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	44.20%	44.70%
Residential Mortgage [Member]	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	100.00%	100.00%
Residential Mortgage [Member] | TEXAS	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	5.80%	5.80%
Residential Mortgage [Member] | CALIFORNIA	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	29.50%	29.20%
Residential Mortgage [Member] | FLORIDA	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	3.60%	3.60%
Residential Mortgage [Member] | PENNSYLVANIA	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	1.70%	1.60%
Residential Mortgage [Member] | ILLINOIS	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	4.40%	4.80%
Residential Mortgage [Member] | MICHIGAN	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	3.90%	4.10%
Residential Mortgage [Member] | NEW YORK	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	1.90%	2.00%
Residential Mortgage [Member] | GEORGIA	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	2.10%	1.90%
Residential Mortgage [Member] | OHIO	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	0.70%	0.80%
Residential Mortgage [Member] | NORTH CAROLINA	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	1.90%	2.00%
Residential Mortgage [Member] | Other United States [Member]	'	'
Concentration Risk [Line Items]	'	'
Consumer Concentration Risk	44.50%	44.20%

Recovered_Sheet5

Finance Receivables and Loans, Net (Commercial Concentration Risk) (Details)	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]	'	'
Commercial Concentration Risk	100.00%	100.00%
TEXAS	'	'
Concentration Risk [Line Items]	'	'
Commercial Concentration Risk	13.20%	13.00%
FLORIDA	'	'
Concentration Risk [Line Items]	'	'
Commercial Concentration Risk	12.60%	11.70%
MICHIGAN	'	'
Concentration Risk [Line Items]	'	'
Commercial Concentration Risk	11.60%	12.60%
CALIFORNIA	'	'
Concentration Risk [Line Items]	'	'
Commercial Concentration Risk	9.20%	9.30%
NEW YORK	'	'
Concentration Risk [Line Items]	'	'
Commercial Concentration Risk	4.50%	4.90%
NORTH CAROLINA	'	'
Concentration Risk [Line Items]	'	'
Commercial Concentration Risk	4.10%	3.90%
VIRGINIA	'	'
Concentration Risk [Line Items]	'	'
Commercial Concentration Risk	3.80%	3.90%
PENNSYLVANIA	'	'
Concentration Risk [Line Items]	'	'
Commercial Concentration Risk	3.30%	3.30%
GEORGIA	'	'
Concentration Risk [Line Items]	'	'
Commercial Concentration Risk	3.10%	3.00%
ILLINOIS	'	'
Concentration Risk [Line Items]	'	'
Commercial Concentration Risk	2.50%	1.80%
Other United States [Member]	'	'
Concentration Risk [Line Items]	'	'
Commercial Concentration Risk	32.10%	32.60%

Recovered_Sheet6

Finance Receivables and Loans, Net (Commercial Criticized Exposure) (Details)	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]	'	'
Commercial Criticized Finance Receivables and Loans	100.00%	100.00%
Automotive Dealers [Member]	'	'
Concentration Risk [Line Items]	'	'
Commercial Criticized Finance Receivables and Loans	91.40%	85.70%
532210 Consumer Electronics and Appliances Rental [Member]	'	'
Concentration Risk [Line Items]	'	'
Commercial Criticized Finance Receivables and Loans	3.40%	1.20%
7000 to 9999 Service Industries [Member]	'	'
Concentration Risk [Line Items]	'	'
Commercial Criticized Finance Receivables and Loans	2.50%	4.90%
Other industries [Member]	'	'
Concentration Risk [Line Items]	'	'
Commercial Criticized Finance Receivables and Loans	2.70%	8.20%

Investment_In_Operating_Leases2

Investment In Operating Leases, Net (Investments In Operating Leases) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Leases, Operating [Abstract]	'	'
Property Subject to or Available for Operating Lease, Gross	$21,125	$16,009
Property Subject to or Available for Operating Lease, Accumulated Depreciation	-3,445	-2,459
Property Subject to or Available for Operating Lease, Net	$17,680	$13,550

Investment_In_Operating_Leases3

Investment In Operating Leases, Net (Schedule Of Depreciation Expense On Operating Lease Assets) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leases, Operating [Abstract]	'	'	'
Depreciation Expense On Operating Lease Assets	$2,327	$1,515	$1,158
Gross Remarketing Gains (Losses)	-332	-116	-217
Depreciation expense on operating lease assets	$1,995	$1,399	$941

Recovered_Sheet7

Investment in Operating Leases, Net (Schedule of Operating Leases of Lessor) (Details) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Leases, Operating [Abstract]	'
Operating Leases, Future Minimum Payments Receivable, Current	$2,942
Operating Leases, Future Minimum Payments Receivable, in Two Years	1,890
Operating Leases, Future Minimum Payments Receivable, in Three Years	733
Operating Leases, Future Minimum Payments Receivable, in Four Years	22
Operating Leases, Future Minimum Payments Receivable, Thereafter	0
Operating Leases, Future Minimum Payments Receivable	$5,587

Securitizations_And_Variable_I2

Securitizations And Variable Interest Entities (Schedule Of Variable Interest Entities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Variable Interest Entity [Line Items]	'	'
Assets of nonconsolidated variable interest entities	$899	$1,495
Maximum exposure to loss in nonconsolidated VIEs	939	1,592
Total consoldiated involvement with VIEs	40,123	52,405
Consumer Loans Auto Financing Receivable [Member]	'	'
Variable Interest Entity [Line Items]	'	'
Variable Interest Entity, Consolidated, Carrying Amount, Assets	19,072	28,566
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	0	0
Assets of nonconsolidated variable interest entities	899	1,495
Maximum exposure to loss in nonconsolidated VIEs	899	1,495
Commercial Automobile [Member]	'	'
Variable Interest Entity [Line Items]	'	'
Variable Interest Entity, Consolidated, Carrying Amount, Assets	20,511	23,139
Commercial Other [Member]	'	'
Variable Interest Entity [Line Items]	'	'
Variable Interest Entity, Consolidated, Carrying Amount, Assets	564	728
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	-24	-28
Assets of nonconsolidated variable interest entities	0	0
Maximum exposure to loss in nonconsolidated VIEs	40	85
Consumer Mortgage Other Member	'	'
Variable Interest Entity [Line Items]	'	'
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	'	0
Assets of nonconsolidated variable interest entities	'	0
Maximum exposure to loss in nonconsolidated VIEs	'	$12

Recovered_Sheet8

Securitizations and Variable Interest Entities (Schedule of On-balance Sheet Variable Interest Entities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
On-balance Sheet Variable Interest Entities [Line Items]	'	'	'
Finance receivables and loans, net	$100,328	$99,055	'
Loans and Leases Receivable, Allowance	-1,208	-1,170	-1,503
Total finance receivables and loans, net	99,120	97,885	'
Investment in operating leases, net	17,680	13,550	'
Other Assets	9,589	11,908	'
Assets of operations held-for-sale	516	32,176	'
Assets	151,167	182,347	184,059
Short-term borrowings	8,545	7,461	'
Long-term debt	69,465	74,561	'
Interest payable	888	932	'
Accrued expenses and other liabilities	2,397	6,585	'
Liabilities of operations held-for-sale	0	22,699	'
Liabilities	136,959	162,449	'
Variable Interest Entity, Primary Beneficiary [Member]	'	'	'
On-balance Sheet Variable Interest Entities [Line Items]	'	'	'
Finance receivables and loans, net	32,265	31,510	'
Loans and Leases Receivable, Allowance	-174	-144	'
Total finance receivables and loans, net	32,091	31,366	'
Investment in operating leases, net	4,620	6,060	'
Other Assets	3,436	2,868	'
Assets of operations held-for-sale	0	12,139	'
Assets	40,147	52,433	'
Short-term borrowings	250	400	'
Long-term debt	24,147	26,461	'
Interest payable	0	1	'
Accrued expenses and other liabilities	43	16	'
Liabilities of operations held-for-sale	0	9,686	'
Liabilities	24,440	36,564	'
Variable Interest Entity, Primary Beneficiary [Member] | Consumer Portfolio Segment [Member]	'	'	'
On-balance Sheet Variable Interest Entities [Line Items]	'	'	'
Finance receivables and loans, net	13,291	13,671	'
Variable Interest Entity, Primary Beneficiary [Member] | Commercial Portfolio Segment [Member]	'	'	'
On-balance Sheet Variable Interest Entities [Line Items]	'	'	'
Finance receivables and loans, net	$18,974	$17,839	'

Securitizations_And_Variable_I3

Securitizations And Variable Interest Entities (Schedule Of Cash Flow Received and Paid To Nonconsolidated Securitization Entities) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consumer Loans Auto Financing Receivable [Member]	'	'	'
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]	'	'	'
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale	$0	$6	$0
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers	0	1,979	0
Cash flows received on retained interests in securitization entities	'	0	0
Cash Flows Between Transferor and Transferee, Servicing Fees	13	12	0
Purchases of previously transferred financial assets	'	0	0
Representations and warranties obligations	0	0	0
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other	0	0	0
US Government-sponsored Enterprises [Member]	'	'	'
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]	'	'	'
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale	112	629	131
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers	8,676	32,796	59,815
Cash flows received on retained interests in securitization entities	'	0	0
Cash Flows Between Transferor and Transferee, Servicing Fees	70	693	999
Purchases of previously transferred financial assets	'	-876	-2,537
Representations and warranties obligations	-66	-108	-143
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other	70	-96	-13
Private Placement [Member]	'	'	'
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]	'	'	'
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers	0	5	722
Cash flows received on retained interests in securitization entities	'	71	68
Cash Flows Between Transferor and Transferee, Servicing Fees	0	63	201
Purchases of previously transferred financial assets	'	-12	-222
Representations and warranties obligations	0	-7	-38
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other	$0	$255	$187

Securitizations_And_Variable_I4

Securitizations And Variable Interest Entities (Schedule Of Quantitative Information and Net Credit Losses about Securitized and Other Financial Assets Managed Together) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]	'	'
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	$104,110	$229,266
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	690	2,642
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	481	362
On-Balance Sheet Loans [Member]	'	'
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]	'	'
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	100,363	101,631
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	618	617
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	472	344
On-Balance Sheet Loans [Member] | Consumer Loans Auto Financing Receivable [Member]	'	'
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]	'	'
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	56,417	53,715
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	412	351
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	402	369
On-Balance Sheet Loans [Member] | Residential Mortgage [Member]	'	'
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]	'	'
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	8,460	12,311
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	164	241
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	75	8
On-Balance Sheet Loans [Member] | Commercial Automobile [Member]	'	'
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]	'	'
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	33,803	32,822
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	42	24
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	2	-1
On-Balance Sheet Loans [Member] | Commercial Finance Receivables And Loans, Mortgage [Member]	'	'
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]	'	'
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	0	0
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	0	0
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	0	-1
On-Balance Sheet Loans [Member] | Commercial Other [Member]	'	'
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]	'	'
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	1,683	2,783
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	0	1
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	-7	-31
Off-Balance Sheet Loans [Member]	'	'
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]	'	'
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	899	120,879
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	3	1,896
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	3	2
Off-Balance Sheet Loans [Member] | Consumer Loans Auto Financing Receivable [Member]	'	'
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]	'	'
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	899	1,495
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	3	4
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	3	2
Off-Balance Sheet Loans [Member] | US Government-sponsored Enterprises [Member]	'	'
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]	'	'
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	0	119,384
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	0	1,892
Whole-Loan Transactions [Member]	'	'
Quantitative Information about Securitized and Other Financial Assets Managed Together [Line Items]	'	'
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	2,848	6,756
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	69	129
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	$6	$16

Servicing_Activities_Schedule_

Servicing Activities (Schedule Of Servicing Assets at Fair Value) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Servicing Activities [Abstract]	'	'
Estimated fair value, Beginning Balance	$952	$2,519
Additions from purchases of servicing rights	60	240
Subtractions from disposition of servicing assets	-911	0
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions	-32	-282
Servicing Asset at Fair Value, Other Changes in Fair Value	-69	-395
Deconsolidation of subsidiary	0	-1,130
Estimated fair value, Ending Balance	$0	$952

Servicing_Activities_Schedule_1

Servicing Activities (Schedule Of Sensitivity Analysis of Fair Value) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012
Servicing Activities [Abstract]	'
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life	'4 years 7 months
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed	13.50%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed	($77)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed	-144
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate	7.70%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Discount Rate	-10
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Discount Rate	($19)

Servicing_Activities_Component

Servicing Activities (Components Of Servicing Valuation And Hedge Activities) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of Servicing Valuation and Hedge Activities [Line Items]	'	'	'
Net realized/unrealized gains (losses) included in earnings, Assets	($119)	($599)	'
Servicing asset valuation and hedge activities, net	-213	-4	-434
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]	'	'	'
Components of Servicing Valuation and Hedge Activities [Line Items]	'	'	'
Servicing asset valuation and hedge activities, net	-112	556	359
Mortgage Servicing Rights [Member]	'	'	'
Components of Servicing Valuation and Hedge Activities [Line Items]	'	'	'
Net realized/unrealized gains (losses) included in earnings, Assets	($101)	($560)	($793)

Servicing_Activities_Component1

Servicing Activities (Components Of Mortgage Servicing Fees) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Servicing Activities [Abstract]	'	'	'
Contractual servicing fees, net of guarantee fees and including subservicing	$62	$281	$344
Late fees	2	7	9
Ancillary fees	4	12	12
Total mortgage servicing fees	$68	$300	$365

Servicing_Activities_Narrative

Servicing Activities (Narrative - Automobile Servicing Activities) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Servicing Activities [Abstract]	'	'	'
Automobile Servicing Fees	$58	$109	$160

Servicing_Activities_Schedule_2

Servicing Activities (Schedule Of Total Serviced Automobile Loans Outstanding) (Details) (Automobile Member, USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Automobile Serviced Assets [Line Items]	'	'
Total Primary Serviced Assets	$111,589	$134,122
On-Balance Sheet Loans [Member] | Consumer Loans Auto Financing Receivable [Member]	'	'
Automobile Serviced Assets [Line Items]	'	'
Total Primary Serviced Assets	56,417	53,715
On-Balance Sheet Loans [Member] | Commercial Automobile [Member]	'	'
Automobile Serviced Assets [Line Items]	'	'
Total Primary Serviced Assets	33,803	32,822
On-Balance Sheet Loans [Member] | Operating Leases [Member]	'	'
Automobile Serviced Assets [Line Items]	'	'
Total Primary Serviced Assets	17,680	13,550
On-Balance Sheet Loans [Member] | Operations Held-For-Sale [Member]	'	'
Automobile Serviced Assets [Line Items]	'	'
Total Primary Serviced Assets	0	25,979
On-Balance Sheet Loans [Member] | Other Assets [Member]	'	'
Automobile Serviced Assets [Line Items]	'	'
Total Primary Serviced Assets	54	41
Off-Balance Sheet Loans [Member] | Securitizations [Member]	'	'
Automobile Serviced Assets [Line Items]	'	'
Total Primary Serviced Assets	887	1,474
Off-Balance Sheet Loans [Member] | Whole-Loan Transactions [Member]	'	'
Automobile Serviced Assets [Line Items]	'	'
Total Primary Serviced Assets	$2,748	$6,541

Premiums_Receivable_and_Other_2

Premiums Receivable and Other Insurance Assets (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Premiums Receivable and Other Insurance Assets [Abstract]	'	'
Prepaid Reinsurance Premiums	$288	$236
Reinsurance Receivables, Incurred but Not Reported Claims	182	234
Reinsurance Recoverables	13	40
Premiums Receivable, at Carrying Value	85	108
Deferred Policy Acquisition Costs	1,045	991
Premiums receivable and other insurance assets	$1,613	$1,609

Other_Assets_Schedule_Of_Other

Other Assets (Schedule Of Other Assets) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Other Assets [Abstract]	'	'
Property, Plant and Equipment, Gross	$709	$693
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	-474	-411
Property, Plant and Equipment, Net	235	282
Restricted cash collections for securitization trusts	3,664	2,983
Deferred Tax Assets, State Taxes	2,040	1,190
Cash reserve deposits held for securitization trusts	402	442
Derivative Asset, Fair Value, Gross Asset	362	2,298
Nonmarketable equity securities	337	303
Cash and securities collateral placed with counterparties	328	1,290
Unamortized Debt Issuance Expense	312	425
Other accounts receivable	290	525
Restricted cash and cash equivalents	205	889
Other Assets, Miscellaneous	1,414	1,281
Other Assets	$9,589	$11,908

Deposit_Liabilities_Schedule_O

Deposit Liabilities (Schedule Of Deposit Liabilities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Deposits [Abstract]	'	'
Noninterest-bearing deposits, Domestic deposits	$60,000,000	$1,977,000,000
Domestic Interest-bearing deposits, Savings and money market checking accounts	21,210,000,000	13,871,000,000
Domestic Interest-bearing deposits, Certificates of deposit	31,640,000,000	31,084,000,000
Domestic Interest-bearing deposits, Dealer deposits	440,000,000	983,000,000
Total deposit liabilities	53,350,000,000	47,915,000,000
Time Deposits, $100,000 or More, Domestic	$13,100,000,000	$12,000,000,000

Recovered_Sheet9

Deposit Liabilities (Schedule of Maturities For Total Time Deposits) (Details) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Maturities For Total Time Deposits [Line Items]	'
Time Deposits	$31,640
One year or less [Member]	'
Schedule of Maturities For Total Time Deposits [Line Items]	'
Time Deposits	15,483
Two years or less [Member]	'
Schedule of Maturities For Total Time Deposits [Line Items]	'
Time Deposits	8,709
Three years or less [Member]	'
Schedule of Maturities For Total Time Deposits [Line Items]	'
Time Deposits	4,275
Four years or less [Member]	'
Schedule of Maturities For Total Time Deposits [Line Items]	'
Time Deposits	2,142
Five years or less [Member]	'
Schedule of Maturities For Total Time Deposits [Line Items]	'
Time Deposits	$1,031

ShortTerm_Borrowings_Schedule_

Short-Term Borrowings (Schedule of Short-term Debt) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Short-term Debt [Line Items]	'	'
Demand Notes	$3,225	$3,094
Short-term Bank Loans and Notes Payable	0	167
Federal Home Loan Bank, Advances, Short-term	3,570	3,800
Securities Sold under Agreements to Repurchase, Gross	1,500	0
Other Short-term Borrowings	250	400
Short-term borrowings	8,545	7,461
Short-term Debt, Weighted Average Interest Rate	0.80%	1.00%
Unsecured Debt [Member]	'	'
Short-term Debt [Line Items]	'	'
Demand Notes	3,225	3,094
Short-term Bank Loans and Notes Payable	0	167
Federal Home Loan Bank, Advances, Short-term	0	0
Securities Sold under Agreements to Repurchase, Gross	0	0
Other Short-term Borrowings	0	0
Short-term borrowings	3,225	3,261
Secured Debt [Member]	'	'
Short-term Debt [Line Items]	'	'
Demand Notes	0	0
Short-term Bank Loans and Notes Payable	0	0
Federal Home Loan Bank, Advances, Short-term	3,570	3,800
Securities Sold under Agreements to Repurchase, Gross	1,500	0
Other Short-term Borrowings	250	400
Short-term borrowings	$5,320	$4,200

LongTerm_Debt_Composition_of_L

Long-Term Debt (Composition of Long-term Debt portfolio) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]	'	'
Derivative, Amount of Hedged Item	$445,000,000	$1,094,000,000
Secured Debt	47,594,000,000	45,111,000,000
Long-term debt	69,465,000,000	74,561,000,000
Fixed Income Interest Rate [Member]	'	'
Debt Instrument [Line Items]	'	'
Unsecured Debt	21,367,000,000	27,588,000,000
Trust preferred securities	2,624,000,000	2,623,000,000
Secured Debt	20,492,000,000	20,076,000,000
Variable Income Interest Rate [Member]	'	'
Debt Instrument [Line Items]	'	'
Unsecured Debt	2,755,000,000	2,345,000,000
Secured Debt	21,782,000,000	20,835,000,000
Unsecured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Derivative, Amount of Hedged Item	445,000,000	1,094,000,000
Long-term debt	27,191,000,000	33,650,000,000
Long-term Debt, Weighted Average Interest Rate	6.28%	6.72%
Secured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Derivative, Amount of Hedged Item	0	0
Long-term debt	42,274,000,000	40,911,000,000
Long-term Debt, Weighted Average Interest Rate	0.98%	1.10%
Variable Interest Entity Debt	24,100,000,000	26,500,000,000
Subordinated Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Unsecured Debt	271,000,000	251,000,000
Revolving secured funding facilities [Member]	'	'
Debt Instrument [Line Items]	'	'
Secured Debt	$15,100,000,000	$13,500,000,000
Minimum [Member] | Unsecured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-Term Debt Interest Rate	0.32%	0.38%
Minimum [Member] | Secured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-Term Debt Interest Rate	0.40%	0.25%
Maximum [Member] | Unsecured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-Term Debt Interest Rate	10.29%	10.29%
Maximum [Member] | Secured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-Term Debt Interest Rate	4.59%	8.30%

LongTerm_Debt_LongTerm_Debt_Po

Long-Term Debt (Long-Term Debt Portfolio) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Debt Instrument [Line Items]	'	'
Due within one year	$17,172	$12,573
Due after one year	51,848	60,894
Derivative, Amount of Hedged Item	445	1,094
Long-term debt	69,465	74,561
Unsecured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Due within one year	5,321	1,070
Due after one year	21,425	31,486
Derivative, Amount of Hedged Item	445	1,094
Long-term debt	27,191	33,650
Secured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Due within one year	11,851	11,503
Due after one year	30,423	29,408
Derivative, Amount of Hedged Item	0	0
Long-term debt	$42,274	$40,911

LongTerm_Debt_Scheduled_Remain

Long-Term Debt (Scheduled Remaining Maturity Of Long-Term Debt) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]	'	'
2014	$17,172,000,000	'
2015	18,923,000,000	'
2016	9,730,000,000	'
2017	8,661,000,000	'
2018	3,444,000,000	'
2019 and thereafter	11,090,000,000	'
Derivative, Amount of Hedged Item	445,000,000	1,094,000,000
Long-term debt	69,465,000,000	74,561,000,000
Derivative Instrument Converting Fixed-rate Debt into Variable-rate Obligations	11,100,000,000	'
Derivative Instrument Converting Variable-rate Debt into Fixed-rate Obligations	4,900,000,000	'
Unsecured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
2014	5,321,000,000	'
2015	5,104,000,000	'
2016	1,869,000,000	'
2017	3,450,000,000	'
2018	1,188,000,000	'
2019 and thereafter	9,814,000,000	'
Derivative, Amount of Hedged Item	445,000,000	1,094,000,000
Long-term debt	27,191,000,000	33,650,000,000
Secured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Derivative, Amount of Hedged Item	0	0
Long-term debt	42,274,000,000	40,911,000,000
Long-term Debt [Member] | Unsecured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
2014	5,511,000,000	'
2015	5,163,000,000	'
2016	1,934,000,000	'
2017	3,527,000,000	'
2018	1,278,000,000	'
2019 and thereafter	10,922,000,000	'
Derivative, Amount of Hedged Item	445,000,000	'
Long-term debt	28,780,000,000	'
Long-term Debt [Member] | Secured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
2014	11,851,000,000	'
2015	13,819,000,000	'
2016	7,861,000,000	'
2017	5,211,000,000	'
2018	2,256,000,000	'
2019 and thereafter	1,276,000,000	'
Derivative, Amount of Hedged Item	0	'
Long-term debt	42,274,000,000	'
Original Issue Discount [Member] | Unsecured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
2014	-190,000,000	'
2015	-59,000,000	'
2016	-65,000,000	'
2017	-77,000,000	'
2018	-90,000,000	'
2019 and thereafter	-1,108,000,000	'
Derivative, Amount of Hedged Item	0	'
Long-term debt	($1,589,000,000)	'

LongTerm_Debt_Pledged_Assets_R

Long-Term Debt (Pledged Assets Related to Secured Borrowings And Repurchase Agreement) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Pledged Assets related to secured borrowings [Line Items]	'	'
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	$2,864	$1,911
Pledged Assets, Mortgage assets held for investment	8,524	9,866
Pledged Assets, Investment in operating leases	5,810	6,058
Pledged Assets, Not Separately Reported, Other	563	999
Pledged Assets, Other, Not Separately Reported on Statement of Financial Position	71,957	67,997
Secured Debt	47,594	45,111
Short-term borrowings	8,545	7,461
Ally Bank [Member]	'	'
Pledged Assets related to secured borrowings [Line Items]	'	'
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	2,864	1,911
Pledged Assets, Mortgage assets held for investment	8,524	9,866
Pledged Assets, Investment in operating leases	3,190	1,691
Pledged Assets, Not Separately Reported, Other	0	272
Pledged Assets, Other, Not Separately Reported on Statement of Financial Position	48,159	48,179
Secured Debt	27,818	29,162
Pledged assets for Federal Home Loan Bank [Member] | Ally Bank [Member]	'	'
Pledged Assets related to secured borrowings [Line Items]	'	'
Pledged Assets, Other, Not Separately Reported on Statement of Financial Position	12,700	12,600
Pledged assets for Federal Reserve Bank [Member] | Ally Bank [Member]	'	'
Pledged Assets related to secured borrowings [Line Items]	'	'
Pledged Assets, Other, Not Separately Reported on Statement of Financial Position	3,200	1,900
Secured Debt [Member]	'	'
Pledged Assets related to secured borrowings [Line Items]	'	'
Short-term borrowings	5,320	4,200
Consumer Loans Auto Financing Receivable [Member]	'	'
Pledged Assets related to secured borrowings [Line Items]	'	'
Pledged Assets, Not Separately Reported, Finance Receivables	32,947	29,557
Consumer Loans Auto Financing Receivable [Member] | Ally Bank [Member]	'	'
Pledged Assets related to secured borrowings [Line Items]	'	'
Pledged Assets, Not Separately Reported, Finance Receivables	12,332	14,833
Commercial Automobile [Member]	'	'
Pledged Assets related to secured borrowings [Line Items]	'	'
Pledged Assets, Not Separately Reported, Finance Receivables	21,249	19,606
Commercial Automobile [Member] | Ally Bank [Member]	'	'
Pledged Assets related to secured borrowings [Line Items]	'	'
Pledged Assets, Not Separately Reported, Finance Receivables	$21,249	$19,606

LongTerm_Debt_Narrative_Trust_

Long-Term Debt (Narrative - Trust Preferred Securities) (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Mar. 07, 2011	Mar. 01, 2011	Dec. 30, 2009
Trust Preferred Securities Subject to Mandatory Redemption [Member]	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Preferred securities	'	'	'	2,540,000
Aggregate liquidation preference	'	'	'	$2,500
Fixed rate / Floating rate	8.13%	'	8.13%	'
Percentage of Preferred Securities Sold	'	100.00%	'	'
Liquidation preference (per share)	$25	'	'	'
London interbank offer rate	'three-month London interbank offer rate plus 5.785%	'	'	'
Warrant [Member]	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Preferred securities	'	'	'	127,000
Aggregate liquidation preference	'	'	'	$127
Class of Warrant or Right, Exercise Price of Warrants or Rights	'	'	'	0.01

LongTerm_Debt_Committed_Fundin

Long-Term Debt (Committed Funding Facilities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Committed Funding Facilities [Member]	'	'
Debt Instrument [Line Items]	'	'
Outstanding	$17,909	$27,526
Unused capacity	6,747	15,535
Total capacity	24,656	43,061
Committed funding reliant upon origination of future automotive receivables [Member]	'	'
Debt Instrument [Line Items]	'	'
Unused capacity	'	2,200
Bank Funding Member | Committed Funding Facilities [Member] | Secured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Outstanding	2,750	3,800
Unused capacity	250	4,700
Total capacity	3,000	8,500
Nonbank Funding Member | Committed Funding Facilities [Member]	'	'
Debt Instrument [Line Items]	'	'
Outstanding	15,159	22,572
Unused capacity	6,497	7,864
Total capacity	21,656	30,436
Nonbank Funding Member | Committed Funding Facilities [Member] | Secured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Outstanding	15,159	22,454
Unused capacity	6,497	7,839
Total capacity	21,656	30,293
Nonbank Funding Member | Committed Funding Facilities [Member] | Secured Debt [Member] | International Businesses [Member]	'	'
Debt Instrument [Line Items]	'	'
Outstanding	'	9,600
Total capacity	'	12,000
Nonbank Funding Member | Committed Funding Facilities [Member] | Unsecured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Outstanding	0	118
Unused capacity	0	25
Total capacity	0	143
Shared Capacity Member | Committed Funding Facilities [Member]	'	'
Debt Instrument [Line Items]	'	'
Outstanding	0	1,154
Unused capacity	0	2,971
Total capacity	0	4,125
Shared Capacity Member | Committed Funding Facilities [Member] | International Businesses [Member]	'	'
Debt Instrument [Line Items]	'	'
Outstanding	'	100
Total capacity	'	100
Revolving secured funding facilities [Member] | Committed Funding Facilities [Member]	'	'
Debt Instrument [Line Items]	'	'
Total capacity	22,400	'
Revolving secured funding facilities 1 year or greater [Member] | Committed Funding Facilities [Member]	'	'
Debt Instrument [Line Items]	'	'
Total capacity	$11,500	'

Accrued_Expenses_and_Other_Lia2

Accrued Expenses and Other Liabilities (Schedule of Accrued Expenses and Other Liabilities) (Details) (USD $)	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Accounts Payable and Accrued Liabilities [Abstract]	'	'	'
Accrued Employee Benefits	$437	'	$494
Accounts Payable	414	'	565
Derivative Liability, Fair Value, Gross Liability	317	'	2,468
Liability for Claims and Claims Adjustment Expense	275	'	341
Cash collateral received from counterparties	159	'	941
Deferred Revenue	122	'	97
ResCap settlement accrual	0	1,950	750
Other Accrued Liabilities	673	'	929
Accrued expenses and other liabilities	2,397	'	6,585
ResCap settlement accrual for insurance proceeds	$150	'	$0

Equity_Schedule_of_Stockholder

Equity (Schedule of Stockholders Equity) (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity [Abstract]	'	'	'
Common Stock, Par or Stated Value Per Share	$0.01	'	'
Common Stock, Shares Authorized	1,547,779	'	'
US Treasury ownership of common stock	63.40%	'	'
Schedule of Stockholders Equity [Line Items]	'	'	'
Common Stock, Shares, Outstanding, beginning of period	1,330,970	1,330,970	1,330,970
Stock Issued During Period, Shares, Conversion of Convertible Securities	216,667	0	0
Common Stock, Shares, Outstanding, end of period	'	1,330,970	1,330,970
Stock Issued During Period, Value, New Issues	$1,270	'	'
Series F-2 Preferred Stock [Member]	'	'	'
Schedule of Stockholders Equity [Line Items]	'	'	'
Stock Issued During Period, Shares, Conversion of Convertible Securities	'	'	531,850

Equity_Narrative_Preferred_Sto

Equity (Narrative - Preferred Stock) (Details) (USD $)

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Mar. 25, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Series F-2 Preferred Stock [Member]

Series F-2 Preferred Stock [Member]

Series F-2 Preferred Stock [Member]

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series G Preferred Stock [Member]

Series G Preferred Stock [Member]

Preferred stock [Member]

Class of Stock [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Preferred Stock, Shares Authorized

'

'

'

228,750,000

228,750,000

'

160,870,560

160,870,560

'

2,576,601

2,576,601

'

Aggregate Liquidation Preference, Authorized Shares

'

'

'

$11,400,000,000

'

'

'

'

'

'

'

'

Conversion of Stock, Shares Converted

'

'

'

'

'

110,000,000

'

'

'

'

'

'

Stock Issued During Period, Shares, Conversion of Convertible Securities

216,667

0

0

'

'

531,850

'

'

'

'

'

'

Stock Issued During Period, Value, New Issues

1,270,000,000

'

'

'

'

'

'

'

'

'

'

'

Preferred Stock, Shares Issued and Outstanding

'

'

'

0

118,750,000

'

40,870,560

40,870,560

'

2,576,601

2,576,601

'

Stock Repurchased During Period, Value

-5,925,000,000

[1]

'

'

'

'

'

'

'

'

'

'

'

Preferred Stock, Dividend Rate, Percentage

'

'

'

9.00%

9.00%

'

8.50%

8.50%

'

7.00%

7.00%

'

Preferred stock dividend rate at August 15, 2016

'

'

'

'

'

'

6.24%

'

'

'

'

'

Liquidation preference (per share)

'

'

'

$50

$50

'

$25

$25

$1,000

$1,000

$1,000

'

Percentage of Amended Series A Perferred Stock sold by subsidary of GM

'

100.00%

'

'

'

'

'

'

'

'

'

'

Series A preferred stock amendment

'

'

'

'

'

'

'

'

'

'

'

($32,000,000)

[2]

[1]

Refer to Note 17 to the Consolidated Financial Statements for further detail.

[2]

Represents a reduction of the estimated payment accrued for tax distributions as a result of the completion of the GMACB LLC U.S.B Return of Partnership Income for the tax period JanuaryB 1,B 2009, through JuneB 30,B 2009.

Equity_Schedule_Of_Preferred_S

Equity (Schedule Of Preferred Stock) (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Mar. 25, 2011
Schedule of Capitalization, Equity [Line Items]	'	'	'
Mandatorily convertible preferred stock held by U.S. Department of Treasury	$0	$5,685	'
Preferred stock	1,255	1,255	'
Series F-2 Preferred Stock [Member]	'	'	'
Schedule of Capitalization, Equity [Line Items]	'	'	'
Mandatorily convertible preferred stock held by U.S. Department of Treasury	0	5,685	'
Preferred stock par value (per share)	$0.01	$0.01	'
Liquidation preference (per share)	$50	$50	'
Preferred Stock, Shares Authorized	228,750,000	228,750,000	'
Preferred Stock, Shares Issued and Outstanding	0	118,750,000	'
Preferred Stock, Dividend Rate, Percentage	9.00%	9.00%	'
Series A Preferred Stock [Member]	'	'	'
Schedule of Capitalization, Equity [Line Items]	'	'	'
Preferred stock	1,021	1,021	'
Preferred stock par value (per share)	$0.01	$0.01	'
Liquidation preference (per share)	$25	$25	$1,000
Preferred Stock, Shares Authorized	160,870,560	160,870,560	'
Preferred Stock, Shares Issued and Outstanding	40,870,560	40,870,560	'
Preferred Stock, Dividend Rate, Percentage	8.50%	8.50%	'
Preferred Stock, Dividend Payment Rate, Variable	'three month LIBORB +B 6.243%	'three month LIBORB +B 6.243%	'
Series G Preferred Stock [Member]	'	'	'
Schedule of Capitalization, Equity [Line Items]	'	'	'
Preferred stock	$234	$234	'
Preferred stock par value (per share)	$0.01	$0.01	'
Liquidation preference (per share)	$1,000	$1,000	'
Preferred Stock, Shares Authorized	2,576,601	2,576,601	'
Preferred Stock, Shares Issued and Outstanding	2,576,601	2,576,601	'
Preferred Stock, Dividend Rate, Percentage	7.00%	7.00%	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) Rollforward (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]	'	'	'
Beginning Balance Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	$76	($114)	($26)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	-345	190	-88
Ending Balance Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	-269	76	-114
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]	'	'	'
Beginning Balance Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	368	352	416
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustments and Net Investment Hedges, Net of Tax, Portion Attributable to Parent	-303	16	-64
Ending Balance Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	65	368	352
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]	'	'	'
Beginning Balance Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	2	6	6
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	3	-4	0
Ending Balance Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	5	2	6
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]	'	'	'
Beginning Balance Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	-135	-157	-137
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	58	22	-20
Ending Balance Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	-77	-135	-157
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'	'	'
Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax	311	87	259
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	-587	224	-172
Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax	($276)	$311	$87

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income (Loss) Before and After Tax (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, [Abstract]	'	'	'
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	($333)	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, before Tax	180	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Discontinued Operations, before Tax	10	'	'
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent	-523	'	'
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax [Abstract]	'	'	'
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	174	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax	-2	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Discontinued Operations, Tax	-2	'	'
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent	178	'	'
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]	'	'	'
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	-159	331	196
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	178	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Discontinued Operations, Net of Tax	8	'	'
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	-345	190	-88
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract]	'	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	-104	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	337	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent	-441	'	'
Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During the Period, Before Tax	59	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment for Net Investment Hedges Included in Net Income, Discontinued Operation, before Tax	-250	'	'
Other Comprehensive Income (Loss), Net Investment Hedges Attributable to Parent, before Tax	309	'	'
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]	'	'	'
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	24	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax	92	'	'
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent	-68	'	'
Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During the Period, Tax	-22	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment for Net Investment Hedges Included in Net Income, Discontinued Operation, Tax	81	'	'
Other Comprehensive Income (Loss), Net Investment Hedges Attributable to Parent, Tax	-103	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]	'	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	-80	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	429	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	-509	184	-237
Other Comprehensive Income Unrealized Gain Loss On Net Investment Hedges Arising During the Period Net of Tax	37	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment for Net Investment Hedges Included in Net Income, Discontinued Operation, Net of Tax	-169	'	'
Other Comprehensive Income (Loss), Net Investment Hedges Attributable to Parent, Net of Tax	206	-168	173
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]	'	'	'
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	-1	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	-7	'	'
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	6	'	'
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]	'	'	'
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	0	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	3	'	'
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	-3	'	'
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]	'	'	'
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	-1	-4	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	-4	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	3	-4	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]	'	'	'
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	26	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	-2	'	'
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans Included in Net Income, Discontinued Operations, before Tax	-49	'	'
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent	77	'	'
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax [Abstract]	'	'	'
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	-8	'	'
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Tax	0	'	'
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans Included in Net Income, Discontinued Operations, Tax	11	'	'
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax, Portion Attributable to Parent	-19	'	'
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]	'	'	'
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	18	-36	-27
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax	-2	'	'
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans Included in Net Income, Discontinued Operations, Net of Tax	-38	'	'
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	58	22	-20
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	-572	'	'
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	-15	'	'
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	($587)	$224	($172)

Earnings_Per_Common_Share_Sche

Earnings Per Common Share (Schedule Of Basic And Diluted Earnings Per Common Share) (Details) (USD $)

3 Months Ended

12 Months Ended

In Millions, except Share data, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Earnings Per Share [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Net income (loss) from continuing operations

$79

$177

$100

$60

$934

$251

$183

$2

$416

$1,370

($219)

Preferred stock dividends - U.S. Department of Treasury

'

'

'

'

'

'

'

'

-543

[1]

-535

-534

Impact of repurchase of MCP held by U.S. Department of Treasury

'

'

'

'

'

'

'

'

-240

[2]

0

[2]

0

[2]

Preferred stock dividends

'

'

'

'

'

'

'

'

-267

-267

-260

Impact of preferred stock amendment

'

'

'

'

'

'

'

'

0

0

32

Net income (loss) from continuing operations attributable to common shareholders

'

'

'

'

'

'

'

'

-634

[3]

568

[3]

-981

[3]

Income (loss) from discontinued operations, net of tax

25

-86

-1,027

1,033

466

133

-1,081

308

-55

-174

62

Net income (loss) attributable to common shareholders

'

'

'

'

'

'

'

'

($689)

$394

($919)

Basic weighted-average common shares outstanding

'

'

'

'

'

'

'

'

1,355,375

1,330,970

1,330,970

Diluted weighted-average common shares outstanding

'

'

'

'

'

'

'

'

1,355,375

[3]

1,330,970

[3]

1,330,970

[3]

Earnings Per Share, Basic [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Net income (loss) from continuing operations, Per Basic Share

($270)

($18)

($75)

($105)

$551

$38

($13)

($149)

($468)

$427

($738)

Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share

'

'

'

'

'

'

'

'

($41)

($131)

$47

Net (loss) income, Basic

($251)

($82)

($847)

$671

$901

$137

($825)

$82

($509)

$296

($691)

Earnings Per Share, Diluted [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Net income (loss) from continuing operations, Per Diluted Share

($270)

($18)

($75)

($105)

$455

$38

($13)

($149)

($468)

[3]

$427

[3]

($738)

[3]

Income (loss) from discontinued operations, net of tax, Diluted

'

'

'

'

'

'

'

'

($41)

[3]

($131)

[3]

$47

[3]

Net (loss) income, Diluted

($251)

($82)

($847)

$671

$700

$137

($825)

$82

($509)

[3]

$296

[3]

($691)

[3]

Potential common shares excluded from diluted earnings per share calculation

'

'

'

'

'

'

'

'

288,000

574,000

574,000

[1]

Includes $8 million of preferred stock dividends paid to the U.S. Department of Treasury related to the period from November 15, 2013 through November 20, 2013.

[2]

Refer to Note 17 to the Consolidated Financial Statements for further detail.

[3]

Due to the antidilutive effect of converting the Fixed Rate Cumulative Mandatorily Convertible Preferred Stock into common shares and the net loss from continuing operations attributable to common shareholders for 2013, and 2011, respectively, net (loss) income from continuing operations attributable to common shareholders and basic weighted-average common shares outstanding were used to calculate basic and diluted earnings per share.

Regulatory_Capital_Schedule_Of

Regulatory Capital (Schedule Of Regulatory Capital Amount And Ratios) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
assets greater than $50 billion	$50,000,000,000	'
Parent Company [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Tier 1 common ratio above 5 percent	5.00%	'
Tier 1 (to risk-weighted assets), Amount	15,165,000,000	20,232,000,000
Tier 1 (to risk-weighted assets), Ratio	11.79%	13.13%
Tier 1 (to risk-weighted assets), Required minimum	4.00%	'
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	'
Total (to risk-weighted assets), Amount	16,405,000,000	21,669,000,000
Total (to risk-weighted assets), Ratio	12.76%	14.07%
Total (to risk-weighted assets), Required minimum	8.00%	'
Total (to risk-weighted assets), Well-capitalized minimum	10.00%	'
Tier 1 leverage (to adjusted average assets), Amount	15,165,000,000	20,232,000,000
Tier One Leverage Capital to Average Assets	10.23%	11.16%
Tier 1 leverage (to adjusted average assets), Well-capitalized minimum	5.00%	'
Tier 1 common (to risk-weighted assets), Amount	11,366,000,000	10,749,000,000
Tier 1 common (to risk-weighted assets), Ratio	8.84%	6.98%
Parent Company [Member] | Minimum [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	3.00%	'
Parent Company [Member] | Maximum [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	'
Ally Bank [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Tier 1 (to risk-weighted assets), Amount	15,159,000,000	14,136,000,000
Tier 1 (to risk-weighted assets), Ratio	16.73%	16.26%
Tier 1 (to risk-weighted assets), Required minimum	4.00%	'
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	'
Total (to risk-weighted assets), Amount	15,809,000,000	14,827,000,000
Total (to risk-weighted assets), Ratio	17.45%	17.06%
Total (to risk-weighted assets), Required minimum	8.00%	'
Total (to risk-weighted assets), Well-capitalized minimum	10.00%	'
Tier 1 leverage (to adjusted average assets), Amount	15,159,000,000	14,136,000,000
Tier One Leverage Capital to Average Assets	15.77%	15.30%
Tier 1 Leverage To Average Assets For Ally Bank	15.00%	'
Tier 1 leverage (to adjusted average assets), Well-capitalized minimum	5.00%	'
Tier 1 common (to risk-weighted assets), Amount	$15,159,000,000	$14,136,000,000
Tier 1 common (to risk-weighted assets), Ratio	16.73%	16.26%

Regulatory_Capital_Regulatory_

Regulatory Capital (Regulatory Matters) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Regulatory Matters [Line Items]	'	'	'
Assets	$151,167	$182,347	$184,059
Insurance Operations [Member]	'	'	'
Regulatory Matters [Line Items]	'	'	'
Assets	7,124	8,439	8,036
Maximum dividend to be paid without statutory approval	110	'	'
Ally Bank [Member]	'	'	'
Regulatory Matters [Line Items]	'	'	'
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	'	'
Total (to risk-weighted assets), Required minimum	8.00%	'	'
Tier 1 (to risk-weighted assets), Required minimum	4.00%	'	'
Assets	98,700	94,800	'
FRB required reserve balance	$416	$214	'
Parent Company [Member]	'	'	'
Regulatory Matters [Line Items]	'	'	'
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	'	'
Total (to risk-weighted assets), Required minimum	8.00%	'	'
Tier 1 (to risk-weighted assets), Required minimum	4.00%	'	'
Basel III [Member] | Parent Company [Member]	'	'	'
Regulatory Matters [Line Items]	'	'	'
Minimum Common Equity Tier 1 risk-based capital	4.50%	'	'
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	'	'
Total (to risk-weighted assets), Required minimum	8.00%	'	'
Common equity Tier 1 capital conservation buffer	2.50%	'	'
Minimum [Member] | Parent Company [Member]	'	'	'
Regulatory Matters [Line Items]	'	'	'
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	3.00%	'	'
Minimum [Member] | Basel III [Member] | Parent Company [Member]	'	'	'
Regulatory Matters [Line Items]	'	'	'
Supplementary leverage ratio	3.00%	'	'
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	'	'

Derivative_Instruments_And_Hed2

Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'	'
Cash and securities collateral placed with counterparties	$328	$1,290
Non-derivative collateral placed with counterparties	18	18
Cash collateral received from counterparties	159	941
noncash collateral received	$18	$0.30

Derivative_Instruments_And_Hed3

Derivative Instruments And Hedging Activities (Fair Value Amounts Of Derivative Instruments Reported On Our Condensed Consolidated Balance Sheet) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	$362,000,000	$2,298,000,000
Nontrading Derivative Liabilities	317,000,000	2,468,000,000
Derivative Liability, Fair Value, Gross Liability	317,000,000	2,468,000,000
Notional amount	101,221,000,000	236,237,000,000
Accrued Interest [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	120,000,000	175,000,000
Derivative Liability, Fair Value, Gross Liability	12,000,000	144,000,000
Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	207,000,000	446,000,000
Derivative Liability, Fair Value, Gross Liability	169,000,000	63,000,000
Notional amount	21,932,000,000	18,521,000,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	204,000,000	411,000,000
Derivative Liability, Fair Value, Gross Liability	169,000,000	10,000,000
Notional amount	21,606,000,000	9,828,000,000
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	3,000,000	35,000,000
Derivative Liability, Fair Value, Gross Liability	0	53,000,000
Notional amount	326,000,000	8,693,000,000
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	142,000,000	1,846,000,000
Derivative Liability, Fair Value, Gross Liability	141,000,000	2,371,000,000
Notional amount	77,543,000,000	214,698,000,000
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	13,000,000	5,000,000
Derivative Liability, Fair Value, Gross Liability	2,000,000	26,000,000
Notional amount	1,743,000,000	2,464,000,000
Equity Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	0	1,000,000
Derivative Liability, Fair Value, Gross Liability	5,000,000	8,000,000
Notional amount	3,000,000	554,000,000
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Receive-fixed Swaps, Fair Value, Gross Asset	196,000,000	411,000,000
Receive-fixed Swaps, Fair Value, Gross Liability	163,000,000	0
Receive-fixed Swaps, Notional Amount	8,500,000,000	7,200,000,000
Pay-fixed Swaps, Fair Value, Gross Asset	9,000,000	0
Pay-fixed Swaps, Fair Value, Gross Liability	5,000,000	'
Pay-fixed Swaps, Notional Amount	12,600,000,000	'
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Pay-fixed Swaps, Fair Value, Gross Asset	1,000,000	10,000,000
Pay-fixed Swaps, Notional Amount	495,000,000	2,600,000,000
Interest Rate Swap [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	36,000,000	1,524,000,000
Derivative Liability, Fair Value, Gross Liability	44,000,000	2,255,000,000
Notional amount	13,613,000,000	131,337,000,000
Foreign Exchange Forward [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	1,000,000	4,000,000
Derivative Liability, Fair Value, Gross Liability	1,000,000	23,000,000
Notional amount	330,000,000	2,462,000,000
Futures and Forwards [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	11,000,000	78,000,000
Derivative Liability, Fair Value, Gross Liability	3,000,000	46,000,000
Notional amount	29,836,000,000	62,328,000,000
Written Options [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	94,000,000	70,000,000
Notional amount	11,132,000,000	3,066,000,000
Written Options [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	0	1,000,000
Notional amount	17,000,000	1,000,000
Written Options [Member] | Equity Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	5,000,000	8,000,000
Notional amount	3,000,000	435,000,000
Purchased Options [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	95,000,000	244,000,000
Derivative Liability, Fair Value, Gross Liability	0	0
Notional amount	22,962,000,000	17,967,000,000
Purchased Options [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	0	1,000,000
Derivative Liability, Fair Value, Gross Liability	0	0
Notional amount	17,000,000	1,000,000
Purchased Options [Member] | Equity Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	0	1,000,000
Derivative Liability, Fair Value, Gross Liability	0	0
Notional amount	0	119,000,000
Swap [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	12,000,000	0
Derivative Liability, Fair Value, Gross Liability	1,000,000	2,000,000
Notional amount	1,379,000,000	0
Other Trading [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	155,000,000	1,852,000,000
Derivative Liability, Fair Value, Gross Liability	148,000,000	2,405,000,000
Notional amount	$79,289,000,000	$217,716,000,000

Derivative_Instruments_And_Hed4

Derivative Instruments And Hedging Activities (Statement Of Gains and Losses on Derivative Instruments Reported in Statement of Comprehensive Income) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Interest and Fee Income, Loans and Leases	$4,529	$4,539	$4,189
Interest on long-term debt	-2,602	-3,336	-3,930
Other income, net of losses	383	737	621
Servicing asset valuation and hedge activities, net	-213	-4	-434
Gain (loss) on mortgage and automotive loans, net	55	379	229
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	-135	533	60
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	118	-87	78
Gain (Loss) on Derivative Instruments, Net, Pretax	5	417	182
Interest Gain For Qualifying Accounting Hedges Of Debt	131	119	248
Gains on amortization of deferred basis adjustments on the hedged items	247	226	216
Gain (Loss) from Revaulation of Foreign-Denominated Debt or Receivable	-117	87	-103
Designated as Hedging Instrument [Member]	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	22	-29	44
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Gain (Loss) Recognized in Earnings on Derivatives [Member]	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Interest and Fee Income, Loans and Leases	7	0	0
Interest on long-term debt	-389	164	895
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Gain (Loss) Recognized in Earnings on Hedged Item [Member]	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Interest and Fee Income, Loans and Leases	2	0	0
Interest on long-term debt	402	-193	-851
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Gain (loss) Excluded from Earnings on Derivatives [Domain]	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Interest and Fee Income, Loans and Leases	9	'	'
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Other income, net of losses	14	-18	-57
Servicing asset valuation and hedge activities, net	-112	556	359
Gain (loss) on mortgage and automotive loans, net	-37	-5	-242
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Gain (Loss) Recognized in Earnings on Derivatives [Member]	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Other income, net of losses	0	0	35
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Gain (Loss) Recognized in Earnings on Hedged Item [Member]	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Other income, net of losses	0	0	-35
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Interest on long-term debt	94	-39	61
Other income, net of losses	$24	($48)	$17

Derivative_Instruments_And_Hed5

Derivative Instruments And Hedging Activities (Derivative Instruments Used In Net Investment Hedge Accounting Relationships) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Cumulative Translation Adjustment, Net of Tax, Period Increase (Decrease)	($582)	$285	($237)
Interest Rate Contract [Member] | Cash Flow Hedging [Member]	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	-7	1	0
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	-7	5
Cash flow hedges, total interest on long-term debt	-7	-6	5
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	6	-7	-1
Foreign Exchange Contract [Member] | Net Investment Hedging [Member]	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	-250	-1	-8
Derivative Instruments, Gain (Loss) Recognized in Income, Net	0	0	-3
Net Investment Hedges - Total Other Income, Net of Losses	-250	-1	-11
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$309	($270)	$173

Income_Taxes_Schedule_of_Signi

Income Taxes (Schedule of Significant Components of Income Tax Expense) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Current Federal Tax Expense (Benefit)	'	'	'	'	'	'	'	'	$0	$0	$10
Current Foreign Tax Expense (Benefit)	'	'	'	'	'	'	'	'	4	-24	29
Current State and Local Tax Expense (Benefit)	'	'	'	'	'	'	'	'	0	10	8
Current Income Tax Expense (Benefit)	'	'	'	'	'	'	'	'	4	-14	47
Deferred Federal Income Tax Expense (Benefit)	'	'	'	'	'	'	'	'	-67	-663	0
Deferred Foreign Income Tax Expense (Benefit)	'	'	'	'	'	'	'	'	-1	25	-5
Deferred State and Local Income Tax Expense (Benefit)	'	'	'	'	'	'	'	'	5	-204	0
Deferred Income Tax Expense (Benefit)	'	'	'	'	'	'	'	'	-63	-842	-5
Income tax expense (benefit) from continuing operations	($4)	$28	$40	($123)	($887)	$46	($16)	$1	($59)	($856)	$42

Income_Taxes_Schedule_of_Effec

Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	'	'	'	'	'	'	'	'	$125	$180	($62)
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance	'	'	'	'	'	'	'	'	-154	-1,022	49
Income Tax Reconciliation, Foreign Capital Loss	'	'	'	'	'	'	'	'	-45	-45	0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	'	'	'	'	'	'	'	'	-44	0	0
Income Tax Reconciliation, Foreign Income Tax Rate Differential	'	'	'	'	'	'	'	'	-3	9	30
Income Tax Reconciliation, State and Local Income Taxes	'	'	'	'	'	'	'	'	16	-34	22
Income Tax Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary	'	'	'	'	'	'	'	'	26	12	9
Income Tax Reconciliation, Other Adjustments	'	'	'	'	'	'	'	'	20	44	-6
Income tax expense (benefit) from continuing operations	($4)	$28	$40	($123)	($887)	$46	($16)	$1	($59)	($856)	$42

Income_Taxes_Schedule_of_Defer

Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Income Tax Disclosure [Abstract]	'	'
Deferred Tax Assets, Tax Credit Carryforwards	$1,874	$1,631
Deferred Tax Assets, Tax Loss Carryforward	1,624	1,025
Deferred Tax Asset, Mark-to-market on consumer finance receivables and loans	721	880
Deferred Tax Assets, State and local taxes	297	263
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	257	306
Deferred Tax Assets, Hedging Transactions	177	267
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Reserve	140	142
Deferred Tax Assets, ResCap Accrual	53	262
Deferred Tax Assets, Sales of finance receivables and loans	0	206
Deferred Tax Assets, Equity Investment	0	486
Deferred Tax Assets, Other	247	266
Deferred Tax Assets, Gross	5,390	5,734
Deferred Tax Assets, Valuation Allowance	-1,154	-1,653
Deferred Tax Assets, Net of Valuation Allowance	4,236	4,081
Deferred Tax Liabilities, Leasing Arrangements	1,527	1,756
Deferred tax liabilities, deferred expense, deferred acqusition cost	351	333
Deferred Tax Liabilities, Financing Arrangements	191	226
Deferred Tax Liabilities, Basis Difference in Subsidiaries	55	454
Deferred Tax Liabilities, Sales of finance receivables and loans	26	0
Deferred Tax Liabilities, Other	46	128
Deferred Tax Liabilities, Gross	2,196	2,897
Deferred Tax Assets, Net	$2,040	$1,184

Income_Taxes_Schedule_of_Defer1

Income Taxes (Schedule of Deferred tax assets and related valuation allowances recognized for net operating and other loss carryforwards and tax credit carryforwards) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Operating Loss Carryforwards [Line Items]	'	'
Deferred Tax Assets, Tax Credit Carryforwards	$1,874	$1,631
Tax Credit Carryforward, Valuation Allowance	-554	'
Net Deferred Tax Assets, Tax Credit Carryforwards	1,320	'
Deferred Tax Assets, Tax Loss Carryforward	1,624	1,025
Tax Loss Carryforwards, Valuation Allowance	-437	'
Net Deferred Tax Asset, Tax Loss Carryforwards	1,187	'
Deferred Tax Assets, State and Local Tax Carryforwards	299	'
State and Local Tax Carryforwards, Valuation Allowance	-133	'
Net Deferred Tax Assets, State and Local Tax Carryforwards	166	'
Deferred Tax Assets, Other Non-Attribute	1,593	'
Other Non-Attribute, Valuation Allowance	-30	'
Net Deferred Tax Assets, Other Non-Attribute	1,563	'
Deferred Tax Assets, Gross	5,390	5,734
Deferred Tax Assets, Valuation Allowance	-1,154	-1,653
Deferred Tax Assets, Net of Valuation Allowance	4,236	4,081
Foreign Tax Credits [Domain]	'	'
Operating Loss Carryforwards [Line Items]	'	'
Deferred Tax Assets, Tax Credit Carryforwards	1,753	'
Tax Credit Carryforward, Valuation Allowance	-554	'
Net Deferred Tax Assets, Tax Credit Carryforwards	1,199	'
General Business Tax Credit Carryforward [Member]	'	'
Operating Loss Carryforwards [Line Items]	'	'
Deferred Tax Assets, Tax Credit Carryforwards	121	'
Tax Credit Carryforward, Valuation Allowance	0	'
Net Deferred Tax Assets, Tax Credit Carryforwards	121	'
Domestic Tax Authority [Member]	'	'
Operating Loss Carryforwards [Line Items]	'	'
Deferred Tax Assets, Operating Loss Carryforwards	1,187	'
Operating Loss Carryforwards, Valuation Allowance	0	'
Net Deferred Tax Assets, Operating Loss Carryforwards	1,187	'
Deferred Tax Assets, Capital Loss Carryforwards	437	'
Capital Loss Carryforwards, Valuation Allowance	-437	'
Net Deferred Tax Assets, Capital Loss Carryforwards	0	'
State and Local Jurisdiction [Member]	'	'
Operating Loss Carryforwards [Line Items]	'	'
Deferred Tax Assets, Operating Loss Carryforwards	253	'
Operating Loss Carryforwards, Valuation Allowance	-87	'
Net Deferred Tax Assets, Operating Loss Carryforwards	166	'
Deferred Tax Assets, Capital Loss Carryforwards	46	'
Capital Loss Carryforwards, Valuation Allowance	-46	'
Net Deferred Tax Assets, Capital Loss Carryforwards	$0	'

Income_Tax_Schedule_of_Unrecog

Income Tax (Schedule of Unrecognized Tax Benefits Roll Forward) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Unrecognized Tax Benefits Beginning Balance	$102	$198	$214
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	174	14	11
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	1	2	20
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	0	-4	-3
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	-14	-17	-35
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	-1	-4	0
Unrecognized tax benefits, foreign-currency translation adjustments	0	-5	-9
Unrecognized Tax Benefits, Deconsolidation of ResCap or Discontinued Operations	0	-82	0
Unrecognized Tax Benefits Ending Balance	$262	$102	$198

Income_Tax_Narrative_Unrecogni

Income Tax (Narrative - Unrecognized Tax Benefits) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$240	$84	$179
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	2	1	1
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	7	7	178
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	($69)	'	'

Employee_Benefit_and_Compensat

Employee Benefit and Compensation Plans (Defined Contribution Plan) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation Related Costs [Abstract]	'	'	'
Defined Contribution Plan, Cost Recognized	$50	$49	$49

Employee_Benefits_and_Compensa2

Employee Benefits and Compensation Plans (Defined Benefit Pension Plans) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Compensation Related Costs [Abstract]	'	'
Defined Benefit Plan, Accumulated Benefit Obligation	$141	$355
Defined Benefit Plan, Fair Value of Plan Assets	142	214
Defined Benefit Plan, Funded Status of Plan	$1	($141)

Employee_Benefits_and_Compensa3

Employee Benefits and Compensation Plans (Share-based compensation) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	$9,000	'	'
Pecent of TARP obligation that must be paid to receive 25% IRSU compensation	25.00%	'	'
TARP Repayment	75.00%	'	'
Restricted Stock Units (RSUs) [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	14,858	17,057	'
Share-based Compensation	64,000,000	78,000,000	50,000,000
Deferred Stock Unit [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	11,980	13,190	'
Share-based Compensation	65,000,000	57,000,000	19,000,000
Incentive Restricted Stock Unit [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	2,462	6,475	'
Share-based Compensation	$8,000,000	$23,000,000	$12,000,000
Shares Awarded 2008 [Member] | Restricted Stock Units (RSUs) [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	'	189	'
Shares Awarded 2009 [Member] | Restricted Stock Units (RSUs) [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	57	844	'
Shares Awarded 2010 [Member] | Restricted Stock Units (RSUs) [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	577	2,648	'
Shares Awarded 2011 [Member] | Restricted Stock Units (RSUs) [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,877	5,956	'
Shares Awarded 2012 [Member] | Restricted Stock Units (RSUs) [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	5,546	7,420	'
Shares Awarded 2013 [Member] | Restricted Stock Units (RSUs) [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	6,801	'	'

Fair_Value_Fair_Value_Measurme

Fair Value (Fair Value Measurment - Recurring Basis) (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

In Millions, unless otherwise specified

Interest Rate Contract [Member]

Interest Rate Contract [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Interest Rate Contract [Member]

Interest Rate Contract [Member]

Foreign Exchange Contract [Member]

Foreign Exchange Contract [Member]

Other Contract [Member]

Debt Securities [Member]

Debt Securities [Member]

US Treasury and Government [Member]

US Treasury and Government [Member]

US States and Political Subdivisions Debt Securities [Member]

Foreign Government Debt Securities [Member]

Foreign Government Debt Securities [Member]

Collateralized Mortgage Backed Securities [Member]

Collateralized Mortgage Backed Securities [Member]

Commercial Mortgage Backed Securities [Member]

Asset-backed Securities [Member]

Asset-backed Securities [Member]

Corporate Debt Securities [Member]

Corporate Debt Securities [Member]

Equity Securities [Member]

Equity Securities [Member]

Interest Rate Contract [Member]

Interest Rate Contract [Member]

Foreign Exchange Contract [Member]

Foreign Exchange Contract [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Interest Rate Contract [Member]

Interest Rate Contract [Member]

Foreign Exchange Contract [Member]

Foreign Exchange Contract [Member]

Other Contract [Member]

Debt Securities [Member]

Debt Securities [Member]

US Treasury and Government [Member]

US Treasury and Government [Member]

US States and Political Subdivisions Debt Securities [Member]

Foreign Government Debt Securities [Member]

Foreign Government Debt Securities [Member]

Collateralized Mortgage Backed Securities [Member]

Collateralized Mortgage Backed Securities [Member]

Commercial Mortgage Backed Securities [Member]

Asset-backed Securities [Member]

Asset-backed Securities [Member]

Corporate Debt Securities [Member]

Corporate Debt Securities [Member]

Equity Securities [Member]

Equity Securities [Member]

Interest Rate Contract [Member]

Interest Rate Contract [Member]

Foreign Exchange Contract [Member]

Foreign Exchange Contract [Member]

Interest Rate Contract [Member]

Interest Rate Contract [Member]

Foreign Exchange Contract [Member]

Foreign Exchange Contract [Member]

Other Contract [Member]

Debt Securities [Member]

Debt Securities [Member]

US Treasury and Government [Member]

US Treasury and Government [Member]

US States and Political Subdivisions Debt Securities [Member]

Foreign Government Debt Securities [Member]

Foreign Government Debt Securities [Member]

Collateralized Mortgage Backed Securities [Member]

Collateralized Mortgage Backed Securities [Member]

Commercial Mortgage Backed Securities [Member]

Asset-backed Securities [Member]

Asset-backed Securities [Member]

Corporate Debt Securities [Member]

Corporate Debt Securities [Member]

Equity Securities [Member]

Equity Securities [Member]

Interest Rate Contract [Member]

Interest Rate Contract [Member]

Foreign Exchange Contract [Member]

Foreign Exchange Contract [Member]

Interest Rate Contract [Member]

Interest Rate Contract [Member]

Foreign Exchange Contract [Member]

Foreign Exchange Contract [Member]

Other Contract [Member]

Debt Securities [Member]

Debt Securities [Member]

US Treasury and Government [Member]

US Treasury and Government [Member]

US States and Political Subdivisions Debt Securities [Member]

Foreign Government Debt Securities [Member]

Foreign Government Debt Securities [Member]

Collateralized Mortgage Backed Securities [Member]

Collateralized Mortgage Backed Securities [Member]

Commercial Mortgage Backed Securities [Member]

Asset-backed Securities [Member]

Asset-backed Securities [Member]

Corporate Debt Securities [Member]

Corporate Debt Securities [Member]

Equity Securities [Member]

Equity Securities [Member]

Interest Rate Contract [Member]

Interest Rate Contract [Member]

Foreign Exchange Contract [Member]

Foreign Exchange Contract [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3

'

'

'

$93

$93

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Available-for-sale Securities

17,083

14,178

'

'

'

17,083

14,178

'

'

'

'

'

16,139

13,026

1,427

2,214

315

288

303

10,782

6,906

39

2,219

2,340

1,069

1,263

944

1,152

'

'

'

'

1,261

1,852

'

'

'

'

'

317

700

310

697

0

7

3

0

0

0

0

0

0

0

944

1,152

'

'

'

'

15,822

12,326

'

'

'

'

'

15,822

12,326

1,117

1,517

315

281

300

10,782

6,906

39

2,219

2,340

1,069

1,263

0

0

'

'

'

'

0

0

'

'

'

'

'

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

'

'

'

'

Mortgage loans held-for-sale, net

'

'

'

'

'

16

2,490

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

16

2,490

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Mortgage servicing rights

0

952

2,519

'

'

'

952

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

952

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Retained Interest, Fair Value Disclosure

'

'

'

'

'

100

154

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100

154

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Assets

'

'

'

'

'

362

2,298

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

346

2,258

16

40

46

40

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

46

40

0

0

223

2,210

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

207

2,170

16

40

93

48

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

93

48

0

0

Securities Held as Collateral, at Fair Value

'

'

'

'

'

133

202

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

103

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

133

99

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total assets

'

'

'

'

'

17,694

20,274

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,307

1,995

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

16,194

17,125

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

193

1,154

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Financial Instruments, Liabilities, Fair Value Disclosure

'

'

'

'

'

-317

-2,468

-310

-2,388

-2

-80

-5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-20

-13

-15

-13

0

0

-5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-203

-2,452

-201

-2,374

-2

-78

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-94

-3

-94

-1

0

-2

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Liabilities, Fair Value Disclosure

'

'

'

'

'

($317)

($2,468)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

($20)

($13)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

($203)

($2,452)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

($94)

($3)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Available-for-sale, Equity Investment in Any One Industry Did Not Exceed Percentage

19.00%

21.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair_Value_Fair_Value_Measurem

Fair Value (Fair Value Measurements - Recurring Fair Value Inputs) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013
In Millions, unless otherwise specified	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Retained Interest [Member]	Retained Interest [Member]
			Fair Value, Inputs, Level 3 [Member]	Fair Value, Inputs, Level 3 [Member]	Discounted cash flow [Member]	Discounted cash flow [Member]
					Minimum [Member]	Maximum [Member]
Fair value inputs, Quantitative Information [Line Items]	'	'	'	'	'	'
Fair Value Inputs, Discount Rate	'	'	'	'	5.30%	5.50%
Retained Interest, Fair Value Disclosure	$100	$154	$100	$154	'	'
Fair Value Inputs, Commercial Paper Rate	'	'	'	'	0.00%	0.10%

Fair_Value_Fair_Value_Measurem1

Fair Value (Fair Value Measurement - Reconciliation of Level 3 Assets And Liabilities) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Assets, Beginning balance	$1,151	$3,797	'
Net realized/unrealized gains (losses) included in earnings, Assets	-119	-599	'
Net realized/unrealized gains (losses) included in other comprehensive income, Assets	0	-12	'
Purchases, Assets	0	12	'
Sales, Assets	-911	-314	'
Issuances, Assets	60	240	'
Settlements, Assets	-71	-209	'
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets	'	-1,764	'
Fair Value, Assets, Ending balance	99	1,151	'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	11	-671	'
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Liabilities, Beginning balance	0	-859	'
Net realized/unrealized gains (losses) included in earnings, Liabilities	'	-115	'
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities	'	0	'
Purchases, Liabilities	'	-11	'
Sales, Liabilities	'	0	'
Issuances, Liabilities	'	0	'
Settlements, Liabilities	'	399	'
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Liabilities	'	586	'
Fair Value, Liabilities, Ending balance	'	0	'
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'	-62	'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	-11	'	'
On-Balance Sheet Securitization Debt [Member]	'	'	'
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Liabilities, Beginning balance	'	-830	'
Net realized/unrealized gains (losses) included in earnings, Liabilities	'	-115	'
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities	'	0	'
Purchases, Liabilities	'	0	'
Sales, Liabilities	'	0	'
Issuances, Liabilities	'	0	'
Settlements, Liabilities	'	389	'
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Liabilities	'	556	'
Fair Value, Liabilities, Ending balance	'	0	'
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'	-62	'
Loan repurchase liabilities [Member]	'	'	'
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Liabilities, Beginning balance	'	-29	'
Net realized/unrealized gains (losses) included in earnings, Liabilities	'	0	'
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities	'	0	'
Purchases, Liabilities	'	-11	'
Sales, Liabilities	'	0	'
Issuances, Liabilities	'	0	'
Settlements, Liabilities	'	10	'
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Liabilities	'	30	'
Fair Value, Liabilities, Ending balance	'	0	'
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'	0	'
Residential Mortgage Backed Securities [Member]	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Assets, Beginning balance	'	33	'
Net realized/unrealized gains (losses) included in earnings, Assets	'	2	'
Net realized/unrealized gains (losses) included in other comprehensive income, Assets	'	0	'
Purchases, Assets	'	0	'
Sales, Assets	'	0	'
Issuances, Assets	'	0	'
Settlements, Assets	'	-4	'
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets	'	-31	'
Fair Value, Assets, Ending balance	'	0	'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'	4	'
Asset-backed Securities [Member]	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Assets, Beginning balance	'	62	'
Net realized/unrealized gains (losses) included in earnings, Assets	'	19	'
Net realized/unrealized gains (losses) included in other comprehensive income, Assets	'	-12	'
Purchases, Assets	'	0	'
Sales, Assets	'	-69	'
Issuances, Assets	'	0	'
Settlements, Assets	'	0	'
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets	'	0	'
Fair Value, Assets, Ending balance	'	0	'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'	0	'
Mortgage Loans Held-For-Sale [Member]	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Assets, Beginning balance	'	30	'
Net realized/unrealized gains (losses) included in earnings, Assets	'	0	'
Net realized/unrealized gains (losses) included in other comprehensive income, Assets	'	0	'
Purchases, Assets	'	12	'
Sales, Assets	'	0	'
Issuances, Assets	'	0	'
Settlements, Assets	'	-11	'
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets	'	-31	'
Fair Value, Assets, Ending balance	'	0	'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'	0	'
Consumer Mortgage Finance Receivables And Loans [Member]	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Assets, Beginning balance	'	835	'
Net realized/unrealized gains (losses) included in earnings, Assets	'	121	'
Net realized/unrealized gains (losses) included in other comprehensive income, Assets	'	0	'
Purchases, Assets	'	0	'
Sales, Assets	'	-245	'
Issuances, Assets	'	0	'
Settlements, Assets	'	-124	'
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets	'	-587	'
Fair Value, Assets, Ending balance	'	0	'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'	51	'
Mortgage Servicing Rights [Member]	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Assets, Beginning balance	952	2,519	'
Net realized/unrealized gains (losses) included in earnings, Assets	-101	-560	-793
Net realized/unrealized gains (losses) included in other comprehensive income, Assets	0	0	'
Purchases, Assets	0	0	'
Sales, Assets	-911	0	'
Issuances, Assets	60	240	'
Settlements, Assets	0	0	'
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets	'	-1,130	'
Fair Value, Assets, Ending balance	0	952	2,519
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	-677	'
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	'	'
Retained Interest [Member]	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Assets, Beginning balance	154	231	'
Net realized/unrealized gains (losses) included in earnings, Assets	23	46	'
Net realized/unrealized gains (losses) included in other comprehensive income, Assets	0	0	'
Purchases, Assets	0	0	'
Sales, Assets	0	0	'
Issuances, Assets	0	0	'
Settlements, Assets	-77	-123	'
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets	'	0	'
Fair Value, Assets, Ending balance	100	154	'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0	'
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	'	'
Derivative Financial Instruments, Assets [Member]	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Net Derivative Asset (Liability), Beginning balance	45	87	'
Gain (Loss) Included in Earnings, Net Derivative Asset (Liability)	-41	-110	'
Gain (Loss) Included in Other Comprehensive Income (Loss), Net Derivative Asset (Liability)	0	0	'
Purchases, Net Derivative Asset (Liability)	0	0	'
Sales, Net Derivative Asset (Liability)	0	0	'
Issuances, Net Derivative Asset (Liability)	0	0	'
Settlements, Net Derivative Asset (Liability)	6	53	'
Transfers out of Level 3, Net Derivative Asset (Liability)	-11	15	'
Fair Value, Net Derivative Asset (Liability), Ending balance	-1	45	'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	11	-49	'
Interest Rate Contract [Member]	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Net Derivative Asset (Liability), Beginning balance	47	71	'
Gain (Loss) Included in Earnings, Net Derivative Asset (Liability)	-52	-78	'
Gain (Loss) Included in Other Comprehensive Income (Loss), Net Derivative Asset (Liability)	0	0	'
Purchases, Net Derivative Asset (Liability)	0	0	'
Sales, Net Derivative Asset (Liability)	0	0	'
Issuances, Net Derivative Asset (Liability)	0	0	'
Settlements, Net Derivative Asset (Liability)	4	53	'
Transfers out of Level 3, Net Derivative Asset (Liability)	0	1	'
Fair Value, Net Derivative Asset (Liability), Ending balance	-1	47	'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	1	'
Foreign Exchange Contract [Member]	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Fair Value, Net Derivative Asset (Liability), Beginning balance	-2	16	'
Gain (Loss) Included in Earnings, Net Derivative Asset (Liability)	11	-32	'
Gain (Loss) Included in Other Comprehensive Income (Loss), Net Derivative Asset (Liability)	0	0	'
Purchases, Net Derivative Asset (Liability)	0	0	'
Sales, Net Derivative Asset (Liability)	0	0	'
Issuances, Net Derivative Asset (Liability)	0	0	'
Settlements, Net Derivative Asset (Liability)	2	0	'
Transfers out of Level 3, Net Derivative Asset (Liability)	-11	14	'
Fair Value, Net Derivative Asset (Liability), Ending balance	0	-2	'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	11	-50	'
Fair Value, Inputs, Level 3 [Member] | Mortgage Servicing Rights [Member]	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Net realized/unrealized gains (losses) included in earnings, Assets	'	($677)	'

Fair_Value_Fair_Value_Measurem2

Fair Value (Fair Value Measurement - Nonrecurring Basis) (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Mortgages Held-for-sale, Fair Value Disclosure	$18	'
Commercial Finance Receivables and Loans, Net, Fair Value	113	131
Total assets	142	134
Mortgage Loans Held-For-Sale [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Lower of cost or fair value or valuation reserve allowance	0	'
Commercial Finance Receivables And Loans, Automotive [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Commercial Finance Receivables and Loans, Net, Fair Value	54	108
Lower of cost or fair value or valuation reserve allowance	-9	-19
Commercial Finance Receivables And Loans, Other [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Commercial Finance Receivables and Loans, Net, Fair Value	59	23
Lower of cost or fair value or valuation reserve allowance	-16	-7
Commercial Loan [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Lower of cost or fair value or valuation reserve allowance	-25	-26
Repossessed And Foreclosed Assets [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other Assets, Fair Value Disclosure	9	3
Lower of cost or fair value or valuation reserve allowance	-3	-2
Other Assets [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other Assets, Fair Value Disclosure	2	'
Cost-method Investments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Lower of cost or fair value or valuation reserve allowance	0	'
Assets, Total [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Lower of cost or fair value or valuation reserve allowance	-28	-28
Fair Value, Inputs, Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Mortgages Held-for-sale, Fair Value Disclosure	0	'
Commercial Finance Receivables and Loans, Net, Fair Value	0	0
Total assets	0	0
Fair Value, Inputs, Level 1 [Member] | Commercial Finance Receivables And Loans, Automotive [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Commercial Finance Receivables and Loans, Net, Fair Value	0	0
Fair Value, Inputs, Level 1 [Member] | Commercial Finance Receivables And Loans, Other [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Commercial Finance Receivables and Loans, Net, Fair Value	0	0
Fair Value, Inputs, Level 1 [Member] | Repossessed And Foreclosed Assets [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Cost-method Investments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other Assets, Fair Value Disclosure	0	'
Fair Value, Inputs, Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Mortgages Held-for-sale, Fair Value Disclosure	0	'
Commercial Finance Receivables and Loans, Net, Fair Value	0	0
Total assets	0	0
Fair Value, Inputs, Level 2 [Member] | Commercial Finance Receivables And Loans, Automotive [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Commercial Finance Receivables and Loans, Net, Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] | Commercial Finance Receivables And Loans, Other [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Commercial Finance Receivables and Loans, Net, Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] | Repossessed And Foreclosed Assets [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | Cost-method Investments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other Assets, Fair Value Disclosure	0	'
Fair Value, Inputs, Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Mortgages Held-for-sale, Fair Value Disclosure	18	'
Commercial Finance Receivables and Loans, Net, Fair Value	113	131
Total assets	142	134
Fair Value, Inputs, Level 3 [Member] | Commercial Finance Receivables And Loans, Automotive [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Commercial Finance Receivables and Loans, Net, Fair Value	54	108
Fair Value, Inputs, Level 3 [Member] | Commercial Finance Receivables And Loans, Other [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Commercial Finance Receivables and Loans, Net, Fair Value	59	23
Fair Value, Inputs, Level 3 [Member] | Repossessed And Foreclosed Assets [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other Assets, Fair Value Disclosure	9	3
Fair Value, Inputs, Level 3 [Member] | Cost-method Investments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other Assets, Fair Value Disclosure	$2	'

Fair_Value_Fair_Value_Measurem3

Fair Value (Fair Value Measurements - Nonrecurring Fair Value Inputs) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]	'
Fair value inputs, Quantitative Information [Line Items]	'
Commercial automobile finance receivables	54
Commercial Finance Receivables And Loans, Automotive [Member] | Fair Value of Collateral [Member] | Minimum [Member]	'
Fair value inputs, Quantitative Information [Line Items]	'
Fair Value Inputs, Adjusted Appraisal Value	65.00%
Commercial Finance Receivables And Loans, Automotive [Member] | Fair Value of Collateral [Member] | Maximum [Member]	'
Fair value inputs, Quantitative Information [Line Items]	'
Fair Value Inputs, Adjusted Appraisal Value	95.00%

Fair_Value_Fair_Value_Option_S

Fair Value (Fair Value Option - Summary Of Changes Included In The Condensed Consolidated Statement Of Income) (Details) (Mortgage Loans Held-For-Sale [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Fair Value, Option, Changes in Fair Value, Gain (Loss)	($11)	$50
Interest on loans held-for-sale [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Fair Value, Option, Changes in Fair Value, Gain (Loss)	20	82
Gain on mortgage loans, net [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Fair Value, Option, Changes in Fair Value, Gain (Loss)	($31)	($32)

Fair_Value_Fair_Value_Option_E

Fair Value (Fair Value Option Election) (Details) (Mortgage Loans Held For Sale, Net [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Fair Value Option Election, Unpaid Principal Balance [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Mortgages Held-for-sale, Fair Value Disclosure	$31	$2,416
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status	18	47
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due	15	36
Fair Value Option Election, Fair Value [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Mortgages Held-for-sale, Fair Value Disclosure	16	2,490
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status	9	25
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due	$8	$19

Fair_Value_Fair_Value_of_Finan

Fair Value (Fair Value of Financial Instruments) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Loans held-for-sale, net	$35	$2,576
Total finance receivables and loans, net	99,120	97,885
Nonmarketable equity securities	337	303
Deposit liabilities	53,350	47,915
Short-term borrowings	8,545	7,461
Long-term debt	69,465	74,561
Deferred interest for zero coupon bonds	359	321
Carrying (Reported) Amount, Fair Value Disclosure [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Loans held-for-sale, net	35	2,576
Total finance receivables and loans, net	99,120	97,885
Nonmarketable equity securities	337	303
Deposit liabilities	53,350	47,915
Short-term borrowings	8,545	7,461
Long-term debt	69,824	74,882
Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Loans held-for-sale, net	35	2,576
Total finance receivables and loans, net	100,090	98,907
Nonmarketable equity securities	346	306
Deposit liabilities	54,070	48,752
Short-term borrowings	8,545	7,460
Long-term debt	73,364	78,551
Fair Value, Inputs, Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Loans held-for-sale, net	0	0
Total finance receivables and loans, net	0	0
Nonmarketable equity securities	0	0
Deposit liabilities	0	0
Short-term borrowings	0	6
Long-term debt	0	0
Fair Value, Inputs, Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Loans held-for-sale, net	17	2,490
Total finance receivables and loans, net	0	0
Nonmarketable equity securities	308	272
Deposit liabilities	0	0
Short-term borrowings	0	0
Long-term debt	31,067	36,018
Fair Value, Inputs, Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Loans held-for-sale, net	18	86
Total finance receivables and loans, net	100,090	98,907
Nonmarketable equity securities	38	34
Deposit liabilities	54,070	48,752
Short-term borrowings	8,545	7,454
Long-term debt	$42,297	$42,533

Offsetting_Assets_and_Liabilit2

Offsetting Assets and Liabilities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	$362	$2,298
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	-108	-1,291
Derivative, Collateral, Right to Reclaim Cash	-120	-841
Derivative Liability, Fair Value, Gross Liability	-317	-2,468
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	108	1,291
Derivative, Collateral, Obligation to Return Cash	137	1,092
Securities Sold under Agreements to Repurchase, Gross	-1,500	0
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	0	'
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral, Net	-1,500	'
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	0	'
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	1,500	'
Securities Sold under Agreements to Repurchase	0	'
Net Asset [Member]	'	'
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	319	1,395
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	-65	-503
Derivative, Collateral, Right to Reclaim Cash	-120	-841
Derivative assets in net liability positions [Member]	'	'
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	43	788
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	-43	-788
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative assets with no offsetting arrangements [Member]	'	'
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	'	115
Derivative Asset, Fair Value, Amount Offset Against Collateral	'	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	'	0
Derivative, Collateral, Right to Reclaim Cash	'	0
Net liability [Member]	'	'
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative Liability, Fair Value, Gross Liability	-252	-1,929
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	43	788
Derivative, Collateral, Obligation to Return Cash	137	1,092
Derivative liabilities in net asset positions [Member]	'	'
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative Liability, Fair Value, Gross Liability	-65	-503
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	65	503
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative liabilities with no offsetting arrangements [Member]	'	'
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative Liability, Fair Value, Gross Liability	'	-36
Derivative Liability, Fair Value, Amount Offset Against Collateral	'	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	'	0
Derivative, Collateral, Obligation to Return Cash	'	0
Assets [Member]	'	'
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative, Fair Value, Amount Offset Against Collateral, Net	362	2,298
Derivative Assets	134	166
Assets [Member] | Net Asset [Member]	'	'
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative, Fair Value, Amount Offset Against Collateral, Net	319	1,395
Derivative Assets	134	51
Assets [Member] | Derivative assets in net liability positions [Member]	'	'
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative, Fair Value, Amount Offset Against Collateral, Net	43	788
Derivative Assets	0	0
Assets [Member] | Derivative assets with no offsetting arrangements [Member]	'	'
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative, Fair Value, Amount Offset Against Collateral, Net	'	115
Derivative Assets	'	115
Liabilities, Total [Member]	'	'
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative, Fair Value, Amount Offset Against Collateral, Net	-317	-2,468
Derivative Liability	-72	-85
Gross Amounts of Recognized Liabilities	-1,817	'
Gross Amounts Offset in the Condensed Consolidated Balance Sheet	0	'
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet	-1,817	'
Gross Amounts Not Offset Against Collateral	108	'
Obligation to Return Cash	1,637	'
Net Amount	-72	'
Liabilities, Total [Member] | Net liability [Member]	'	'
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative, Fair Value, Amount Offset Against Collateral, Net	-252	-1,929
Derivative Liability	-72	-49
Liabilities, Total [Member] | Derivative liabilities in net asset positions [Member]	'	'
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative, Fair Value, Amount Offset Against Collateral, Net	-65	-503
Derivative Liability	0	0
Liabilities, Total [Member] | Derivative liabilities with no offsetting arrangements [Member]	'	'
Offsetting Assets and Liabilities [Line Items]	'	'
Derivative, Fair Value, Amount Offset Against Collateral, Net	'	-36
Derivative Liability	'	($36)

Segment_And_Geographic_Informa2

Segment And Geographic Information (Financial Information Operating Segments) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net financing revenue (loss)	$774,000,000	$737,000,000	$628,000,000	$640,000,000	$611,000,000	$472,000,000	$457,000,000	$351,000,000	$2,779,000,000	$1,891,000,000	$1,124,000,000
Other revenue	325,000,000	371,000,000	402,000,000	386,000,000	480,000,000	775,000,000	714,000,000	605,000,000	1,484,000,000	2,574,000,000	2,288,000,000
Total net revenue (loss)	1,099,000,000	1,108,000,000	1,030,000,000	1,026,000,000	1,091,000,000	1,247,000,000	1,171,000,000	956,000,000	4,263,000,000	4,465,000,000	3,412,000,000
Provision for loan losses	140,000,000	141,000,000	89,000,000	131,000,000	93,000,000	105,000,000	33,000,000	98,000,000	501,000,000	329,000,000	161,000,000
Total noninterest expense	884,000,000	762,000,000	801,000,000	958,000,000	951,000,000	845,000,000	971,000,000	855,000,000	3,405,000,000	3,622,000,000	3,428,000,000
Income (loss) from continuing operations before income tax expense	75,000,000	205,000,000	140,000,000	-63,000,000	47,000,000	297,000,000	167,000,000	3,000,000	357,000,000	514,000,000	-177,000,000
Assets	151,167,000,000	'	'	'	182,347,000,000	'	'	'	151,167,000,000	182,347,000,000	184,059,000,000
Net Interest Income (Loss) after Provision for Loan Losses	'	'	'	'	'	'	'	'	2,300,000,000	1,600,000,000	1,000,000,000
Automotive finance operations [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net financing revenue (loss)	'	'	'	'	'	'	'	'	3,159,000,000	2,827,000,000	2,530,000,000
Other revenue	'	'	'	'	'	'	'	'	268,000,000	322,000,000	422,000,000
Total net revenue (loss)	'	'	'	'	'	'	'	'	3,427,000,000	3,149,000,000	2,952,000,000
Provision for loan losses	'	'	'	'	'	'	'	'	494,000,000	253,000,000	89,000,000
Total noninterest expense	'	'	'	'	'	'	'	'	1,662,000,000	1,507,000,000	1,530,000,000
Income (loss) from continuing operations before income tax expense	'	'	'	'	'	'	'	'	1,271,000,000	1,389,000,000	1,333,000,000
Assets	109,312,000,000	'	'	'	128,411,000,000	'	'	'	109,312,000,000	128,411,000,000	112,591,000,000
Insurance Operations [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net financing revenue (loss)	'	'	'	'	'	'	'	'	57,000,000	64,000,000	62,000,000
Other revenue	'	'	'	'	'	'	'	'	1,196,000,000	1,150,000,000	1,336,000,000
Total net revenue (loss)	'	'	'	'	'	'	'	'	1,253,000,000	1,214,000,000	1,398,000,000
Provision for loan losses	'	'	'	'	'	'	'	'	0	0	0
Total noninterest expense	'	'	'	'	'	'	'	'	999,000,000	1,054,000,000	1,082,000,000
Income (loss) from continuing operations before income tax expense	'	'	'	'	'	'	'	'	254,000,000	160,000,000	316,000,000
Assets	7,124,000,000	'	'	'	8,439,000,000	'	'	'	7,124,000,000	8,439,000,000	8,036,000,000
Mortgage Operations [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net financing revenue (loss)	'	'	'	'	'	'	'	'	76,000,000	149,000,000	205,000,000
Other revenue	'	'	'	'	'	'	'	'	0	1,159,000,000	354,000,000
Total net revenue (loss)	'	'	'	'	'	'	'	'	76,000,000	1,308,000,000	559,000,000
Provision for loan losses	'	'	'	'	'	'	'	'	13,000,000	86,000,000	123,000,000
Total noninterest expense	'	'	'	'	'	'	'	'	321,000,000	627,000,000	344,000,000
Income (loss) from continuing operations before income tax expense	'	'	'	'	'	'	'	'	-258,000,000	595,000,000	92,000,000
Assets	8,168,000,000	'	'	'	14,744,000,000	'	'	'	8,168,000,000	14,744,000,000	33,906,000,000
Corporate And Other [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net financing revenue (loss)	'	'	'	'	'	'	'	'	-513,000,000	-1,149,000,000	-1,673,000,000
Other revenue	'	'	'	'	'	'	'	'	20,000,000	-57,000,000	176,000,000
Total net revenue (loss)	'	'	'	'	'	'	'	'	-493,000,000	-1,206,000,000	-1,497,000,000
Provision for loan losses	'	'	'	'	'	'	'	'	-6,000,000	-10,000,000	-51,000,000
Total noninterest expense	'	'	'	'	'	'	'	'	423,000,000	434,000,000	472,000,000
Income (loss) from continuing operations before income tax expense	'	'	'	'	'	'	'	'	-910,000,000	-1,630,000,000	-1,918,000,000
Assets	26,563,000,000	'	'	'	30,753,000,000	'	'	'	26,563,000,000	30,753,000,000	29,526,000,000
Commercial Finance Operations [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Assets	$1,600,000,000	'	'	'	$1,500,000,000	'	'	'	$1,600,000,000	$1,500,000,000	$1,200,000,000

Segment_And_Geographic_Informa3

Segment And Geographic Information (Information Concerning Principal Geographic Areas) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total net revenue (loss)	$1,099	$1,108	$1,030	$1,026	$1,091	$1,247	$1,171	$956	$4,263	$4,465	$3,412
Income (loss) from continuing operations before income tax expense	75	205	140	-63	47	297	167	3	357	514	-177
Net income (loss)	104	91	-927	1,093	1,400	384	-898	310	361	1,196	-157
Identifiable Assets	151,140	'	'	'	182,320	'	'	'	151,140	182,320	183,541
Long-Lived Assets	17,916	'	'	'	13,881	'	'	'	17,916	13,881	9,640
Foreign [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total net revenue (loss)	'	'	'	'	'	'	'	'	164	211	138
Income (loss) from continuing operations before income tax expense	'	'	'	'	'	'	'	'	51	18	-34
Net income (loss)	'	'	'	'	'	'	'	'	1,595	796	784
Identifiable Assets	3,225	'	'	'	32,778	'	'	'	3,225	32,778	33,071
Long-Lived Assets	0	'	'	'	50	'	'	'	0	50	404
Canada [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total net revenue (loss)	'	'	'	'	'	'	'	'	171	233	174
Income (loss) from continuing operations before income tax expense	'	'	'	'	'	'	'	'	64	48	-13
Net income (loss)	'	'	'	'	'	'	'	'	1,266	295	436
Identifiable Assets	704	'	'	'	13,362	'	'	'	704	13,362	15,156
Long-Lived Assets	0	'	'	'	1	'	'	'	0	1	282
Europe [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total net revenue (loss)	'	'	'	'	'	'	'	'	-8	-28	-42
Income (loss) from continuing operations before income tax expense	'	'	'	'	'	'	'	'	-18	-14	-3
Net income (loss)	'	'	'	'	'	'	'	'	-88	183	175
Identifiable Assets	1,972	'	'	'	10,971	'	'	'	1,972	10,971	9,976
Long-Lived Assets	0	'	'	'	16	'	'	'	0	16	92
Latin America [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total net revenue (loss)	'	'	'	'	'	'	'	'	0	2	4
Income (loss) from continuing operations before income tax expense	'	'	'	'	'	'	'	'	7	-19	-18
Net income (loss)	'	'	'	'	'	'	'	'	300	219	104
Identifiable Assets	29	'	'	'	8,050	'	'	'	29	8,050	7,647
Long-Lived Assets	0	'	'	'	33	'	'	'	0	33	30
Asia-Pacific [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total net revenue (loss)	'	'	'	'	'	'	'	'	1	4	2
Income (loss) from continuing operations before income tax expense	'	'	'	'	'	'	'	'	-2	3	0
Net income (loss)	'	'	'	'	'	'	'	'	117	99	69
Identifiable Assets	520	'	'	'	395	'	'	'	520	395	292
Long-Lived Assets	0	'	'	'	0	'	'	'	0	0	0
Domestic [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total net revenue (loss)	'	'	'	'	'	'	'	'	4,099	4,254	3,274
Income (loss) from continuing operations before income tax expense	'	'	'	'	'	'	'	'	306	496	-143
Net income (loss)	'	'	'	'	'	'	'	'	-1,234	400	-941
Identifiable Assets	147,915	'	'	'	149,542	'	'	'	147,915	149,542	150,470
Long-Lived Assets	17,916	'	'	'	13,831	'	'	'	17,916	13,831	9,236
Amortization of Debt Discount (Premium)	'	'	'	'	'	'	'	'	($262)	($349)	($925)

Parent_And_Guarantor_Consolida2

Parent And Guarantor Consolidating Financial Statements (Schedule of Consolidating Statement of Income) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Income Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Interest and fees on finance receivables and loans	'	'	'	'	'	'	'	'	$4,529	$4,539	$4,189
Interest on loans held-for-sale	'	'	'	'	'	'	'	'	20	98	180
Interest on trading assets	'	'	'	'	'	'	'	'	0	10	8
Interest and dividends on available-for-sale investment securities	'	'	'	'	'	'	'	'	325	292	350
Interest-bearing cash	'	'	'	'	'	'	'	'	10	24	15
Operating leases	'	'	'	'	'	'	'	'	3,209	2,379	1,929
Total financing revenue and other interest income	'	'	'	'	'	'	'	'	8,093	7,342	6,671
Interest on deposits	'	'	'	'	'	'	'	'	654	645	615
Interest on short-term borrowings	'	'	'	'	'	'	'	'	63	71	61
Interest on long-term debt	'	'	'	'	'	'	'	'	2,602	3,336	3,930
Total interest expense	'	'	'	'	'	'	'	'	3,319	4,052	4,606
Depreciation expense on operating lease assets	'	'	'	'	'	'	'	'	1,995	1,399	941
Net financing revenue (loss)	774	737	628	640	611	472	457	351	2,779	1,891	1,124
Nonbank subsidiaries	'	'	'	'	'	'	'	'	0	0	0
Servicing fees	'	'	'	'	'	'	'	'	126	409	525
Servicing asset valuation and hedge activities, net	'	'	'	'	'	'	'	'	-213	-4	-434
Total servicing income, net	'	'	'	'	'	'	'	'	-87	405	91
Insurance premiums and service revenue earned	'	'	'	'	'	'	'	'	1,012	1,055	1,153
Gain (loss) on mortgage and automotive loans, net	'	'	'	'	'	'	'	'	55	379	229
Gain (loss) on extinguishment of debt	'	'	'	'	'	'	'	'	-59	-148	-64
Other gain (loss) on investments, net	'	'	'	'	'	'	'	'	180	146	258
Other income, net of losses	'	'	'	'	'	'	'	'	383	737	621
Total other revenue	325	371	402	386	480	775	714	605	1,484	2,574	2,288
Total net revenue (loss)	1,099	1,108	1,030	1,026	1,091	1,247	1,171	956	4,263	4,465	3,412
Provision for loan losses	140	141	89	131	93	105	33	98	501	329	161
Compensation and benefits expense	'	'	'	'	'	'	'	'	1,019	1,106	993
Insurance losses and loss adjustment expenses	'	'	'	'	'	'	'	'	405	454	452
Other operating expenses	'	'	'	'	'	'	'	'	1,981	2,062	1,983
Total noninterest expense	884	762	801	958	951	845	971	855	3,405	3,622	3,428
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	75	205	140	-63	47	297	167	3	357	514	-177
Income tax expense (benefit) from continuing operations	-4	28	40	-123	-887	46	-16	1	-59	-856	42
Net income (loss) from continuing operations	79	177	100	60	934	251	183	2	416	1,370	-219
Income (loss) from discontinued operations, net of tax	25	-86	-1,027	1,033	466	133	-1,081	308	-55	-174	62
Undistributed income of bank subsidiaries	'	'	'	'	'	'	'	'	0	0	0
Undistributed income of nonbank subsidiaries	'	'	'	'	'	'	'	'	0	0	0
Net income (loss)	104	91	-927	1,093	1,400	384	-898	310	361	1,196	-157
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	'	'	'	'	'	'	'	'	-587	224	-172
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	'	'	'	'	'	'	'	-226	1,420	-329
Parent [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Income Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Interest and fees on finance receivables and loans	'	'	'	'	'	'	'	'	771	852	1,071
Interest on loans held-for-sale	'	'	'	'	'	'	'	'	0	15	5
Interest on trading assets	'	'	'	'	'	'	'	'	'	0	0
Interest and dividends on available-for-sale investment securities	'	'	'	'	'	'	'	'	0	0	4
Interest-bearing cash	'	'	'	'	'	'	'	'	3	16	5
Operating leases	'	'	'	'	'	'	'	'	500	232	713
Total financing revenue and other interest income	'	'	'	'	'	'	'	'	1,333	1,219	1,971
Interest on deposits	'	'	'	'	'	'	'	'	25	58	65
Interest on short-term borrowings	'	'	'	'	'	'	'	'	46	60	56
Interest on long-term debt	'	'	'	'	'	'	'	'	2,039	2,676	3,365
Total interest expense	'	'	'	'	'	'	'	'	2,176	2,793	3,473
Depreciation expense on operating lease assets	'	'	'	'	'	'	'	'	369	113	250
Net financing revenue (loss)	'	'	'	'	'	'	'	'	-1,212	-1,687	-1,752
Nonbank subsidiaries	'	'	'	'	'	'	'	'	5,732	1,074	1,383
Servicing fees	'	'	'	'	'	'	'	'	152	191	270
Servicing asset valuation and hedge activities, net	'	'	'	'	'	'	'	'	0	0	0
Total servicing income, net	'	'	'	'	'	'	'	'	152	191	270
Insurance premiums and service revenue earned	'	'	'	'	'	'	'	'	0	0	0
Gain (loss) on mortgage and automotive loans, net	'	'	'	'	'	'	'	'	0	-2	22
Gain (loss) on extinguishment of debt	'	'	'	'	'	'	'	'	-61	0	-64
Other gain (loss) on investments, net	'	'	'	'	'	'	'	'	0	0	10
Other income, net of losses	'	'	'	'	'	'	'	'	157	173	-167
Total other revenue	'	'	'	'	'	'	'	'	248	362	71
Total net revenue (loss)	'	'	'	'	'	'	'	'	4,768	-251	-298
Provision for loan losses	'	'	'	'	'	'	'	'	196	81	58
Compensation and benefits expense	'	'	'	'	'	'	'	'	639	728	685
Insurance losses and loss adjustment expenses	'	'	'	'	'	'	'	'	0	0	0
Other operating expenses	'	'	'	'	'	'	'	'	503	1,090	541
Total noninterest expense	'	'	'	'	'	'	'	'	1,142	1,818	1,226
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	'	'	'	'	'	'	'	'	3,430	-2,150	-1,582
Income tax expense (benefit) from continuing operations	'	'	'	'	'	'	'	'	-967	-172	-616
Net income (loss) from continuing operations	'	'	'	'	'	'	'	'	4,397	-1,978	-966
Income (loss) from discontinued operations, net of tax	'	'	'	'	'	'	'	'	-1,311	49	10
Undistributed income of bank subsidiaries	'	'	'	'	'	'	'	'	883	859	1,254
Undistributed income of nonbank subsidiaries	'	'	'	'	'	'	'	'	-3,608	2,266	-455
Net income (loss)	'	'	'	'	'	'	'	'	361	1,196	-157
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	'	'	'	'	'	'	'	'	-587	224	-172
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	'	'	'	'	'	'	'	-226	1,420	-329
Guarantor Subsidiaries [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Income Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Interest and fees on finance receivables and loans	'	'	'	'	'	'	'	'	0	0	0
Interest on loans held-for-sale	'	'	'	'	'	'	'	'	0	0	0
Interest on trading assets	'	'	'	'	'	'	'	'	'	0	0
Interest and dividends on available-for-sale investment securities	'	'	'	'	'	'	'	'	0	0	0
Interest-bearing cash	'	'	'	'	'	'	'	'	0	0	0
Operating leases	'	'	'	'	'	'	'	'	0	0	0
Total financing revenue and other interest income	'	'	'	'	'	'	'	'	0	0	0
Interest on deposits	'	'	'	'	'	'	'	'	0	0	0
Interest on short-term borrowings	'	'	'	'	'	'	'	'	0	0	0
Interest on long-term debt	'	'	'	'	'	'	'	'	0	0	-1
Total interest expense	'	'	'	'	'	'	'	'	0	1	1
Depreciation expense on operating lease assets	'	'	'	'	'	'	'	'	0	0	0
Net financing revenue (loss)	'	'	'	'	'	'	'	'	0	-1	-1
Nonbank subsidiaries	'	'	'	'	'	'	'	'	3,659	448	0
Servicing fees	'	'	'	'	'	'	'	'	0	0	0
Servicing asset valuation and hedge activities, net	'	'	'	'	'	'	'	'	0	0	0
Total servicing income, net	'	'	'	'	'	'	'	'	0	0	0
Insurance premiums and service revenue earned	'	'	'	'	'	'	'	'	0	0	0
Gain (loss) on mortgage and automotive loans, net	'	'	'	'	'	'	'	'	0	0	0
Gain (loss) on extinguishment of debt	'	'	'	'	'	'	'	'	0	0	0
Other gain (loss) on investments, net	'	'	'	'	'	'	'	'	0	0	0
Other income, net of losses	'	'	'	'	'	'	'	'	0	474	37
Total other revenue	'	'	'	'	'	'	'	'	0	474	37
Total net revenue (loss)	'	'	'	'	'	'	'	'	3,659	921	36
Provision for loan losses	'	'	'	'	'	'	'	'	0	0	0
Compensation and benefits expense	'	'	'	'	'	'	'	'	0	473	37
Insurance losses and loss adjustment expenses	'	'	'	'	'	'	'	'	0	0	0
Other operating expenses	'	'	'	'	'	'	'	'	0	1	1
Total noninterest expense	'	'	'	'	'	'	'	'	0	474	38
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	'	'	'	'	'	'	'	'	3,659	447	-2
Income tax expense (benefit) from continuing operations	'	'	'	'	'	'	'	'	0	0	-1
Net income (loss) from continuing operations	'	'	'	'	'	'	'	'	3,659	447	-1
Income (loss) from discontinued operations, net of tax	'	'	'	'	'	'	'	'	-19	-93	-8
Undistributed income of bank subsidiaries	'	'	'	'	'	'	'	'	883	859	1,254
Undistributed income of nonbank subsidiaries	'	'	'	'	'	'	'	'	-2,393	-105	477
Net income (loss)	'	'	'	'	'	'	'	'	2,130	1,108	1,722
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	'	'	'	'	'	'	'	'	-812	149	-63
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	'	'	'	'	'	'	'	1,318	1,257	1,659
Non-Guarantor Subsidiaries [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Income Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Interest and fees on finance receivables and loans	'	'	'	'	'	'	'	'	3,758	3,687	3,128
Interest on loans held-for-sale	'	'	'	'	'	'	'	'	20	83	175
Interest on trading assets	'	'	'	'	'	'	'	'	'	10	8
Interest and dividends on available-for-sale investment securities	'	'	'	'	'	'	'	'	325	292	346
Interest-bearing cash	'	'	'	'	'	'	'	'	7	8	10
Operating leases	'	'	'	'	'	'	'	'	2,709	2,147	1,216
Total financing revenue and other interest income	'	'	'	'	'	'	'	'	6,894	6,265	4,909
Interest on deposits	'	'	'	'	'	'	'	'	629	587	550
Interest on short-term borrowings	'	'	'	'	'	'	'	'	17	11	5
Interest on long-term debt	'	'	'	'	'	'	'	'	568	677	587
Total interest expense	'	'	'	'	'	'	'	'	1,276	1,395	1,338
Depreciation expense on operating lease assets	'	'	'	'	'	'	'	'	1,626	1,286	691
Net financing revenue (loss)	'	'	'	'	'	'	'	'	3,992	3,584	2,880
Nonbank subsidiaries	'	'	'	'	'	'	'	'	0	0	0
Servicing fees	'	'	'	'	'	'	'	'	-26	218	256
Servicing asset valuation and hedge activities, net	'	'	'	'	'	'	'	'	-213	-4	-434
Total servicing income, net	'	'	'	'	'	'	'	'	-239	214	-178
Insurance premiums and service revenue earned	'	'	'	'	'	'	'	'	1,012	1,055	1,153
Gain (loss) on mortgage and automotive loans, net	'	'	'	'	'	'	'	'	55	381	207
Gain (loss) on extinguishment of debt	'	'	'	'	'	'	'	'	2	-148	0
Other gain (loss) on investments, net	'	'	'	'	'	'	'	'	180	146	248
Other income, net of losses	'	'	'	'	'	'	'	'	1,438	1,280	1,415
Total other revenue	'	'	'	'	'	'	'	'	2,448	2,928	2,845
Total net revenue (loss)	'	'	'	'	'	'	'	'	6,440	6,512	5,725
Provision for loan losses	'	'	'	'	'	'	'	'	305	248	103
Compensation and benefits expense	'	'	'	'	'	'	'	'	822	381	308
Insurance losses and loss adjustment expenses	'	'	'	'	'	'	'	'	405	454	452
Other operating expenses	'	'	'	'	'	'	'	'	2,248	1,685	2,069
Total noninterest expense	'	'	'	'	'	'	'	'	3,475	2,520	2,829
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	'	'	'	'	'	'	'	'	2,660	3,744	2,793
Income tax expense (benefit) from continuing operations	'	'	'	'	'	'	'	'	908	-684	659
Net income (loss) from continuing operations	'	'	'	'	'	'	'	'	1,752	4,428	2,134
Income (loss) from discontinued operations, net of tax	'	'	'	'	'	'	'	'	1,274	-130	57
Undistributed income of bank subsidiaries	'	'	'	'	'	'	'	'	0	0	0
Undistributed income of nonbank subsidiaries	'	'	'	'	'	'	'	'	0	0	0
Net income (loss)	'	'	'	'	'	'	'	'	3,026	4,298	2,191
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	'	'	'	'	'	'	'	'	-858	411	-346
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	'	'	'	'	'	'	'	2,168	4,709	1,845
Consolidation, Eliminations [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Income Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Interest and fees on finance receivables and loans	'	'	'	'	'	'	'	'	0	0	-10
Interest on loans held-for-sale	'	'	'	'	'	'	'	'	0	0	0
Interest on trading assets	'	'	'	'	'	'	'	'	'	0	0
Interest and dividends on available-for-sale investment securities	'	'	'	'	'	'	'	'	0	0	0
Interest-bearing cash	'	'	'	'	'	'	'	'	0	0	0
Operating leases	'	'	'	'	'	'	'	'	0	0	0
Total financing revenue and other interest income	'	'	'	'	'	'	'	'	-134	-142	-209
Interest on deposits	'	'	'	'	'	'	'	'	0	0	0
Interest on short-term borrowings	'	'	'	'	'	'	'	'	0	0	0
Interest on long-term debt	'	'	'	'	'	'	'	'	-5	-17	-21
Total interest expense	'	'	'	'	'	'	'	'	-133	-137	-206
Depreciation expense on operating lease assets	'	'	'	'	'	'	'	'	0	0	0
Net financing revenue (loss)	'	'	'	'	'	'	'	'	-1	-5	-3
Nonbank subsidiaries	'	'	'	'	'	'	'	'	-9,391	-1,522	-1,383
Servicing fees	'	'	'	'	'	'	'	'	0	0	-1
Servicing asset valuation and hedge activities, net	'	'	'	'	'	'	'	'	0	0	0
Total servicing income, net	'	'	'	'	'	'	'	'	0	0	-1
Insurance premiums and service revenue earned	'	'	'	'	'	'	'	'	0	0	0
Gain (loss) on mortgage and automotive loans, net	'	'	'	'	'	'	'	'	0	0	0
Gain (loss) on extinguishment of debt	'	'	'	'	'	'	'	'	0	0	0
Other gain (loss) on investments, net	'	'	'	'	'	'	'	'	0	0	0
Other income, net of losses	'	'	'	'	'	'	'	'	-1,212	-1,190	-664
Total other revenue	'	'	'	'	'	'	'	'	-1,212	-1,190	-665
Total net revenue (loss)	'	'	'	'	'	'	'	'	-10,604	-2,717	-2,051
Provision for loan losses	'	'	'	'	'	'	'	'	0	0	0
Compensation and benefits expense	'	'	'	'	'	'	'	'	-442	-476	-37
Insurance losses and loss adjustment expenses	'	'	'	'	'	'	'	'	0	0	0
Other operating expenses	'	'	'	'	'	'	'	'	-770	-714	-628
Total noninterest expense	'	'	'	'	'	'	'	'	-1,212	-1,190	-665
(Loss) income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries	'	'	'	'	'	'	'	'	-9,392	-1,527	-1,386
Income tax expense (benefit) from continuing operations	'	'	'	'	'	'	'	'	0	0	0
Net income (loss) from continuing operations	'	'	'	'	'	'	'	'	-9,392	-1,527	-1,386
Income (loss) from discontinued operations, net of tax	'	'	'	'	'	'	'	'	1	0	3
Undistributed income of bank subsidiaries	'	'	'	'	'	'	'	'	-1,766	-1,718	-2,508
Undistributed income of nonbank subsidiaries	'	'	'	'	'	'	'	'	6,001	-2,161	-22
Net income (loss)	'	'	'	'	'	'	'	'	-5,156	-5,406	-3,913
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	'	'	'	'	'	'	'	'	1,670	-560	409
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	'	'	'	'	'	'	'	-3,486	-5,966	-3,504
Intercompany [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Income Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Interest and fees on finance receivables and loans	'	'	'	'	'	'	'	'	0	0	0
Interest-bearing cash	'	'	'	'	'	'	'	'	0	0	'
Interest Expense, Debt	'	'	'	'	'	'	'	'	0	0	0
Intercompany [Member] | Parent [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Income Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Interest and fees on finance receivables and loans	'	'	'	'	'	'	'	'	59	104	173
Interest-bearing cash	'	'	'	'	'	'	'	'	0	0	'
Interest Expense, Debt	'	'	'	'	'	'	'	'	66	-1	-13
Intercompany [Member] | Guarantor Subsidiaries [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Income Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Interest and fees on finance receivables and loans	'	'	'	'	'	'	'	'	0	0	0
Interest-bearing cash	'	'	'	'	'	'	'	'	0	0	'
Interest Expense, Debt	'	'	'	'	'	'	'	'	0	1	2
Intercompany [Member] | Non-Guarantor Subsidiaries [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Income Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Interest and fees on finance receivables and loans	'	'	'	'	'	'	'	'	68	22	26
Interest-bearing cash	'	'	'	'	'	'	'	'	7	16	'
Interest Expense, Debt	'	'	'	'	'	'	'	'	62	120	196
Intercompany [Member] | Consolidation, Eliminations [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Income Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Interest and fees on finance receivables and loans	'	'	'	'	'	'	'	'	-127	-126	-199
Interest-bearing cash	'	'	'	'	'	'	'	'	-7	-16	'
Interest Expense, Debt	'	'	'	'	'	'	'	'	($128)	($120)	($185)

Parent_And_Guarantor_Consolida3

Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Balance Sheet) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
In Millions, unless otherwise specified
Condensed Balance Sheet Statements, Captions [Line Items]	'	'	'	'	'
Cash and Due from Banks	$1,315	$1,073	'	'	'
Interest-bearing Deposits in Banks and Other Financial Institutions	4,216	6,440	'	'	'
Total cash and cash equivalents	5,531	7,513	13,035	11,670	11,670
Investment securities	17,083	14,178	'	'	'
Loans held-for-sale, net	35	2,576	'	'	'
Finance receivables and loans, net	100,328	99,055	'	'	'
Loans to bank subsidiary	0	0	'	'	'
Loans to nonbank subsidiary	0	0	'	'	'
Allowance for loan losses	-1,208	-1,170	-1,503	'	'
Total finance receivables and loans, net	99,120	97,885	'	'	'
Investment in operating leases, net	17,680	13,550	'	'	'
Receivables from bank subsidiary	0	0	'	'	'
Receivables from nonbank subsidiary	0	0	'	'	'
Investment in bank subsidiaries	0	0	'	'	'
Investment in nonbank subsidiaries	0	0	'	'	'
Mortgage servicing rights	0	952	2,519	'	'
Premiums receivable and other insurance assets	1,613	1,609	'	'	'
Other Assets	9,589	11,908	'	'	'
Assets of operations held-for-sale	516	32,176	'	'	'
Total assets	151,167	182,347	184,059	'	'
Noninterest-bearing deposit liabilities	60	1,977	'	'	'
Interest-bearing deposit liabilities	53,290	45,938	'	'	'
Total deposit liabilities	53,350	47,915	'	'	'
Short-term borrowings	8,545	7,461	'	'	'
Long-term debt	69,465	74,561	'	'	'
Debt Payable To Nonbank Subsidiaries	0	0	'	'	'
Payables to Bank Subsidiaries	0	0	'	'	'
Payables to Nonbank Subsidiaries	0	0	'	'	'
Interest payable	888	932	'	'	'
Unearned insurance premiums and service revenue	2,314	2,296	'	'	'
Accrued expenses and other liabilities	2,397	6,585	'	'	'
Liabilities of operations held-for-sale	0	22,699	'	'	'
Total liabilities	136,959	162,449	'	'	'
Total equity	14,208	19,898	19,280	20,398	'
Total liabilities and equity	151,167	182,347	'	'	'
Parent [Member]	'	'	'	'	'
Condensed Balance Sheet Statements, Captions [Line Items]	'	'	'	'	'
Cash and Due from Banks	979	729	'	'	'
Interest-bearing Deposits in Banks and Other Financial Institutions	1,951	3,204	'	'	'
Total cash and cash equivalents	2,930	3,972	6,261	4,665	'
Investment securities	0	0	'	'	'
Loans held-for-sale, net	0	0	'	'	'
Finance receivables and loans, net	6,673	12,486	'	'	'
Loans to bank subsidiary	600	1,600	'	'	'
Loans to nonbank subsidiary	4,207	3,514	'	'	'
Allowance for loan losses	-131	-170	'	'	'
Total finance receivables and loans, net	11,349	17,430	'	'	'
Investment in operating leases, net	3,172	2,003	'	'	'
Receivables from bank subsidiary	236	677	'	'	'
Receivables from nonbank subsidiary	465	315	'	'	'
Investment in bank subsidiaries	14,916	14,288	'	'	'
Investment in nonbank subsidiaries	12,201	19,180	'	'	'
Mortgage servicing rights	'	0	'	'	'
Premiums receivable and other insurance assets	0	0	'	'	'
Other Assets	3,122	2,514	'	'	'
Assets of operations held-for-sale	516	855	'	'	'
Total assets	48,907	61,234	'	'	'
Noninterest-bearing deposit liabilities	0	0	'	'	'
Interest-bearing deposit liabilities	440	983	'	'	'
Total deposit liabilities	440	983	'	'	'
Short-term borrowings	3,225	3,094	'	'	'
Long-term debt	25,819	32,342	'	'	'
Debt Payable To Nonbank Subsidiaries	2,334	530	'	'	'
Payables to Bank Subsidiaries	197	752	'	'	'
Payables to Nonbank Subsidiaries	666	674	'	'	'
Interest payable	709	748	'	'	'
Unearned insurance premiums and service revenue	0	0	'	'	'
Accrued expenses and other liabilities	1,309	2,187	'	'	'
Liabilities of operations held-for-sale	'	26	'	'	'
Total liabilities	34,699	41,336	'	'	'
Total equity	14,208	19,898	'	'	'
Total liabilities and equity	48,907	61,234	'	'	'
Guarantor Subsidiaries [Member]	'	'	'	'	'
Condensed Balance Sheet Statements, Captions [Line Items]	'	'	'	'	'
Cash and Due from Banks	37	0	'	'	'
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0	'	'	'
Total cash and cash equivalents	37	0	14	2	'
Investment securities	0	0	'	'	'
Loans held-for-sale, net	0	0	'	'	'
Finance receivables and loans, net	0	0	'	'	'
Loans to bank subsidiary	0	0	'	'	'
Loans to nonbank subsidiary	0	0	'	'	'
Allowance for loan losses	0	0	'	'	'
Total finance receivables and loans, net	0	0	'	'	'
Investment in operating leases, net	0	0	'	'	'
Receivables from bank subsidiary	0	0	'	'	'
Receivables from nonbank subsidiary	0	334	'	'	'
Investment in bank subsidiaries	14,916	14,288	'	'	'
Investment in nonbank subsidiaries	68	3,723	'	'	'
Mortgage servicing rights	'	0	'	'	'
Premiums receivable and other insurance assets	0	0	'	'	'
Other Assets	0	0	'	'	'
Assets of operations held-for-sale	0	762	'	'	'
Total assets	15,021	19,107	'	'	'
Noninterest-bearing deposit liabilities	0	0	'	'	'
Interest-bearing deposit liabilities	0	0	'	'	'
Total deposit liabilities	0	0	'	'	'
Short-term borrowings	0	0	'	'	'
Long-term debt	0	0	'	'	'
Debt Payable To Nonbank Subsidiaries	0	0	'	'	'
Payables to Bank Subsidiaries	0	0	'	'	'
Payables to Nonbank Subsidiaries	0	0	'	'	'
Interest payable	0	0	'	'	'
Unearned insurance premiums and service revenue	0	0	'	'	'
Accrued expenses and other liabilities	93	451	'	'	'
Liabilities of operations held-for-sale	'	725	'	'	'
Total liabilities	93	1,176	'	'	'
Total equity	14,928	17,931	'	'	'
Total liabilities and equity	15,021	19,107	'	'	'
Non-Guarantor Subsidiaries [Member]	'	'	'	'	'
Condensed Balance Sheet Statements, Captions [Line Items]	'	'	'	'	'
Cash and Due from Banks	299	344	'	'	'
Interest-bearing Deposits in Banks and Other Financial Institutions	2,265	3,236	'	'	'
Total cash and cash equivalents	2,974	4,032	7,276	7,506	'
Investment securities	17,083	14,178	'	'	'
Loans held-for-sale, net	35	2,576	'	'	'
Finance receivables and loans, net	93,655	86,569	'	'	'
Loans to bank subsidiary	0	0	'	'	'
Loans to nonbank subsidiary	1,925	672	'	'	'
Allowance for loan losses	-1,077	-1,000	'	'	'
Total finance receivables and loans, net	94,503	86,241	'	'	'
Investment in operating leases, net	14,508	11,547	'	'	'
Receivables from bank subsidiary	0	0	'	'	'
Receivables from nonbank subsidiary	588	378	'	'	'
Investment in bank subsidiaries	0	0	'	'	'
Investment in nonbank subsidiaries	0	0	'	'	'
Mortgage servicing rights	'	952	'	'	'
Premiums receivable and other insurance assets	1,634	1,609	'	'	'
Other Assets	6,880	9,968	'	'	'
Assets of operations held-for-sale	0	30,582	'	'	'
Total assets	138,205	162,063	'	'	'
Noninterest-bearing deposit liabilities	60	1,977	'	'	'
Interest-bearing deposit liabilities	52,850	44,955	'	'	'
Total deposit liabilities	52,910	46,971	'	'	'
Short-term borrowings	5,320	4,367	'	'	'
Long-term debt	43,646	42,219	'	'	'
Debt Payable To Nonbank Subsidiaries	4,808	5,708	'	'	'
Payables to Bank Subsidiaries	0	0	'	'	'
Payables to Nonbank Subsidiaries	447	278	'	'	'
Interest payable	179	184	'	'	'
Unearned insurance premiums and service revenue	2,314	2,296	'	'	'
Accrued expenses and other liabilities	1,408	4,517	'	'	'
Liabilities of operations held-for-sale	'	21,948	'	'	'
Total liabilities	111,032	128,488	'	'	'
Total equity	27,173	33,575	'	'	'
Total liabilities and equity	138,205	162,063	'	'	'
Consolidation, Eliminations [Member]	'	'	'	'	'
Condensed Balance Sheet Statements, Captions [Line Items]	'	'	'	'	'
Cash and Due from Banks	0	0	'	'	'
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0	'	'	'
Total cash and cash equivalents	-410	-491	-516	-503	'
Investment securities	0	0	'	'	'
Loans held-for-sale, net	0	0	'	'	'
Finance receivables and loans, net	0	0	'	'	'
Loans to bank subsidiary	-600	-1,600	'	'	'
Loans to nonbank subsidiary	-6,132	-4,186	'	'	'
Allowance for loan losses	0	0	'	'	'
Total finance receivables and loans, net	-6,732	-5,786	'	'	'
Investment in operating leases, net	0	0	'	'	'
Receivables from bank subsidiary	-236	-677	'	'	'
Receivables from nonbank subsidiary	-1,053	-1,027	'	'	'
Investment in bank subsidiaries	-29,832	-28,576	'	'	'
Investment in nonbank subsidiaries	-12,269	-22,903	'	'	'
Mortgage servicing rights	'	0	'	'	'
Premiums receivable and other insurance assets	-21	0	'	'	'
Other Assets	-413	-574	'	'	'
Assets of operations held-for-sale	0	-23	'	'	'
Total assets	-50,966	-60,057	'	'	'
Noninterest-bearing deposit liabilities	0	0	'	'	'
Interest-bearing deposit liabilities	0	0	'	'	'
Total deposit liabilities	0	-39	'	'	'
Short-term borrowings	0	0	'	'	'
Long-term debt	0	0	'	'	'
Debt Payable To Nonbank Subsidiaries	-7,142	-6,238	'	'	'
Payables to Bank Subsidiaries	-197	-752	'	'	'
Payables to Nonbank Subsidiaries	-1,113	-952	'	'	'
Interest payable	0	0	'	'	'
Unearned insurance premiums and service revenue	0	0	'	'	'
Accrued expenses and other liabilities	-413	-570	'	'	'
Liabilities of operations held-for-sale	'	0	'	'	'
Total liabilities	-8,865	-8,551	'	'	'
Total equity	-42,101	-51,506	'	'	'
Total liabilities and equity	-50,966	-60,057	'	'	'
Intercompany [Member]	'	'	'	'	'
Condensed Balance Sheet Statements, Captions [Line Items]	'	'	'	'	'
Cash and Due from Banks	'	0	'	'	'
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0	'	'	'
Noninterest-bearing deposit liabilities	'	0	'	'	'
Intercompany [Member] | Parent [Member]	'	'	'	'	'
Condensed Balance Sheet Statements, Captions [Line Items]	'	'	'	'	'
Cash and Due from Banks	'	39	'	'	'
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0	'	'	'
Noninterest-bearing deposit liabilities	'	0	'	'	'
Intercompany [Member] | Guarantor Subsidiaries [Member]	'	'	'	'	'
Condensed Balance Sheet Statements, Captions [Line Items]	'	'	'	'	'
Cash and Due from Banks	'	0	'	'	'
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0	'	'	'
Noninterest-bearing deposit liabilities	'	0	'	'	'
Intercompany [Member] | Non-Guarantor Subsidiaries [Member]	'	'	'	'	'
Condensed Balance Sheet Statements, Captions [Line Items]	'	'	'	'	'
Cash and Due from Banks	'	0	'	'	'
Interest-bearing Deposits in Banks and Other Financial Institutions	410	452	'	'	'
Noninterest-bearing deposit liabilities	'	39	'	'	'
Intercompany [Member] | Consolidation, Eliminations [Member]	'	'	'	'	'
Condensed Balance Sheet Statements, Captions [Line Items]	'	'	'	'	'
Cash and Due from Banks	'	-39	'	'	'
Interest-bearing Deposits in Banks and Other Financial Institutions	-410	-452	'	'	'
Noninterest-bearing deposit liabilities	'	-39	'	'	'
Fair Value Option Election, Fair Value [Member]	'	'	'	'	'
Condensed Balance Sheet Statements, Captions [Line Items]	'	'	'	'	'
Finance receivables and loans, net	$100,328	'	'	'	'

Parent_And_Guarantor_Consolida4

Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Statement of Cash Flow) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Condensed Cash Flow Statements, Captions [Line Items]	'		'		'
Net cash provided by (used in) operating activities	$2,501		$5,049		$5,493
Purchases of available-for-sale securities	-12,304		-12,816		-19,377
Proceeds from sales of available-for-sale securities	3,627		7,662		14,232
Proceeds from maturities of available-for-sale securities	5,509		5,673		4,965
Net (increase) decrease in finance receivables and loans	-2,479		-11,943		-16,998
Proceeds from Sale of Loans Held-for-investment	0		2,332		2,868
Net (increase) decrease in operating lease assets	-6,232		-5,699		-1,011
Capital contributions to subsidiaries	0		0		0
Returns of contributed capital	0		0		0
Cash Divested from Deconsolidation	0		-539		0
Payments for (Proceeds from) Mortgage Servicing Rights	911		0		0
Proceeds from sale of business units, net	7,444	[1]	516	[1]	50	[1]
Increase (Decrease) in Restricted Cash	-70		-1,698		346
Other, net	51		-43		797
Net cash (used in) provided by investing activities	-3,543		-16,555		-14,128
Net change in short-term borrowings	1,591		2,694		514
Net increase in bank deposits	5,375		6,653		6,074
Proceeds from issuance of long-term debt	27,312		39,401		44,754
Repayments of long-term debt	-31,892		-39,909		-40,473
Proceeds from Issuance of Common Stock	1,270		0		0
Payments for Repurchase of Convertible Preferred Stock	-5,925		0		0
Dividends paid	-810		-802		-819
Capital contributions from parent	0		0		0
Net cash provided by (used in) financing activities	-3,079		8,037		10,050
Effect of exchange-rate changes on cash and cash equivalents	45		-58		49
Cash and Cash Equivalents, Period Increase (Decrease)	-4,076		-3,527		1,464
Cash and cash equivalents at beginning of period	7,513		13,035		11,670
Cash and cash equivalents at end of period	5,531		7,513		13,035
Net Cash Provided by (Used in) Discontinued Operations	2,094	[1],[2]	-1,995	[1],[2]	-99	[1],[2]
Parent [Member]	'		'		'
Condensed Cash Flow Statements, Captions [Line Items]	'		'		'
Net cash provided by (used in) operating activities	3,015		102		2,695
Purchases of available-for-sale securities	0		0		0
Proceeds from sales of available-for-sale securities	0		0		1,494
Proceeds from maturities of available-for-sale securities	0		0		1
Net (increase) decrease in finance receivables and loans	4,898		3,027		-2,933
Proceeds from Sale of Loans Held-for-investment	'		352		1,346
Net (increase) decrease in operating lease assets	-1,320		-2,268		2,890
Capital contributions to subsidiaries	-477		-261		-1,634
Returns of contributed capital	1,002		2,079		1,255
Cash Divested from Deconsolidation	'		0		'
Payments for (Proceeds from) Mortgage Servicing Rights	0		'		'
Proceeds from sale of business units, net	1,799		29		0
Increase (Decrease) in Restricted Cash	0		0		157
Other, net	41		-247		-33
Net cash (used in) provided by investing activities	6,249		6,590		5,286
Net change in short-term borrowings	131		338		237
Net increase in bank deposits	-543		-785		308
Proceeds from issuance of long-term debt	3,236		3,613		3,201
Repayments of long-term debt	-9,468		-11,238		-9,414
Proceeds from Issuance of Common Stock	1,270		'		'
Payments for Repurchase of Convertible Preferred Stock	-5,925		'		'
Dividends paid	-810		-802		-819
Capital contributions from parent	0		0		0
Net cash provided by (used in) financing activities	-10,306		-8,918		-6,416
Effect of exchange-rate changes on cash and cash equivalents	0		-63		31
Cash and Cash Equivalents, Period Increase (Decrease)	-1,042		-2,289		1,596
Cash and cash equivalents at beginning of period	3,972		6,261		4,665
Cash and cash equivalents at end of period	2,930		3,972		6,261
Net Cash Provided by (Used in) Discontinued Operations	0		0		0
Guarantor Subsidiaries [Member]	'		'		'
Condensed Cash Flow Statements, Captions [Line Items]	'		'		'
Net cash provided by (used in) operating activities	3,572		306		209
Purchases of available-for-sale securities	0		0		0
Proceeds from sales of available-for-sale securities	0		0		0
Proceeds from maturities of available-for-sale securities	0		0		0
Net (increase) decrease in finance receivables and loans	79		2		-51
Proceeds from Sale of Loans Held-for-investment	'		0		0
Net (increase) decrease in operating lease assets	0		0		0
Capital contributions to subsidiaries	0		0		-855
Returns of contributed capital	150		0		0
Cash Divested from Deconsolidation	'		0		'
Payments for (Proceeds from) Mortgage Servicing Rights	0		'		'
Proceeds from sale of business units, net	554		0		0
Increase (Decrease) in Restricted Cash	-26		-13		0
Other, net	0		0		-1
Net cash (used in) provided by investing activities	1,008		94		-896
Net change in short-term borrowings	36		25		47
Net increase in bank deposits	0		1		0
Proceeds from issuance of long-term debt	0		70		200
Repayments of long-term debt	-70		-73		-226
Proceeds from Issuance of Common Stock	0		'		'
Payments for Repurchase of Convertible Preferred Stock	0		'		'
Dividends paid	0		0		0
Capital contributions from parent	29		169		855
Net cash provided by (used in) financing activities	-4,543		-414		699
Effect of exchange-rate changes on cash and cash equivalents	0		0		0
Cash and Cash Equivalents, Period Increase (Decrease)	37		-14		12
Cash and cash equivalents at beginning of period	0		14		2
Cash and cash equivalents at end of period	37		0		14
Net Cash Provided by (Used in) Discontinued Operations	0		0		0
Non-Guarantor Subsidiaries [Member]	'		'		'
Condensed Cash Flow Statements, Captions [Line Items]	'		'		'
Net cash provided by (used in) operating activities	5,305		5,862		3,973
Purchases of available-for-sale securities	-12,304		-12,816		-19,377
Proceeds from sales of available-for-sale securities	3,627		7,662		12,738
Proceeds from maturities of available-for-sale securities	5,509		5,673		4,964
Net (increase) decrease in finance receivables and loans	-7,456		-14,972		-14,014
Proceeds from Sale of Loans Held-for-investment	'		1,980		1,522
Net (increase) decrease in operating lease assets	-4,912		-3,431		-3,901
Capital contributions to subsidiaries	0		0		0
Returns of contributed capital	0		0		0
Cash Divested from Deconsolidation	'		-539		'
Payments for (Proceeds from) Mortgage Servicing Rights	911		'		'
Proceeds from sale of business units, net	5,091		487		50
Increase (Decrease) in Restricted Cash	-44		-1,685		189
Other, net	10		204		831
Net cash (used in) provided by investing activities	-11,071		-17,308		-17,086
Net change in short-term borrowings	1,424		2,331		230
Net increase in bank deposits	5,879		7,476		5,766
Proceeds from issuance of long-term debt	24,076		35,718		41,353
Repayments of long-term debt	-22,354		-28,598		-30,833
Proceeds from Issuance of Common Stock	0		'		'
Payments for Repurchase of Convertible Preferred Stock	0		'		'
Dividends paid	0		0		0
Capital contributions from parent	448		92		1,634
Net cash provided by (used in) financing activities	2,569		10,192		12,964
Effect of exchange-rate changes on cash and cash equivalents	45		5		18
Cash and Cash Equivalents, Period Increase (Decrease)	-3,152		-1,249		-131
Cash and cash equivalents at beginning of period	4,032		7,276		7,506
Cash and cash equivalents at end of period	2,974		4,032		7,276
Net Cash Provided by (Used in) Discontinued Operations	2,094		-1,995		-99
Consolidation, Eliminations [Member]	'		'		'
Condensed Cash Flow Statements, Captions [Line Items]	'		'		'
Net cash provided by (used in) operating activities	-9,391		-1,221		-1,384
Purchases of available-for-sale securities	0		0		0
Proceeds from sales of available-for-sale securities	0		0		0
Proceeds from maturities of available-for-sale securities	0		0		0
Net (increase) decrease in finance receivables and loans	0		0		0
Proceeds from Sale of Loans Held-for-investment	'		0		0
Net (increase) decrease in operating lease assets	0		0		0
Capital contributions to subsidiaries	477		261		2,489
Returns of contributed capital	-1,152		-2,079		-1,255
Cash Divested from Deconsolidation	'		0		'
Payments for (Proceeds from) Mortgage Servicing Rights	0		'		'
Proceeds from sale of business units, net	0		0		0
Increase (Decrease) in Restricted Cash	0		0		0
Other, net	0		0		0
Net cash (used in) provided by investing activities	271		-5,931		-1,432
Net change in short-term borrowings	0		0		0
Net increase in bank deposits	39		-39		0
Proceeds from issuance of long-term debt	0		0		0
Repayments of long-term debt	0		0		0
Proceeds from Issuance of Common Stock	0		'		'
Payments for Repurchase of Convertible Preferred Stock	0		'		'
Dividends paid	0		0		0
Capital contributions from parent	-477		-261		-2,489
Net cash provided by (used in) financing activities	9,201		7,177		2,803
Effect of exchange-rate changes on cash and cash equivalents	0		0		0
Cash and Cash Equivalents, Period Increase (Decrease)	81		25		-13
Cash and cash equivalents at beginning of period	-491		-516		-503
Cash and cash equivalents at end of period	-410		-491		-516
Net Cash Provided by (Used in) Discontinued Operations	0		0		0
Intercompany [Member]	'		'		'
Condensed Cash Flow Statements, Captions [Line Items]	'		'		'
Net (increase) decrease in finance receivables and loans	0		0		0
Net Change in Debt, Intercompany	0		0		0
Dividends paid and returns of contributed capital	0		0		0
Intercompany [Member] | Parent [Member]	'		'		'
Condensed Cash Flow Statements, Captions [Line Items]	'		'		'
Net (increase) decrease in finance receivables and loans	306		3,879		2,743
Net Change in Debt, Intercompany	1,803		-44		71
Dividends paid and returns of contributed capital	0		0		0
Intercompany [Member] | Guarantor Subsidiaries [Member]	'		'		'
Condensed Cash Flow Statements, Captions [Line Items]	'		'		'
Net (increase) decrease in finance receivables and loans	251		105		11
Net Change in Debt, Intercompany	-271		-149		30
Dividends paid and returns of contributed capital	-4,267		-457		-207
Intercompany [Member] | Non-Guarantor Subsidiaries [Member]	'		'		'
Condensed Cash Flow Statements, Captions [Line Items]	'		'		'
Net (increase) decrease in finance receivables and loans	-1,503		129		-88
Net Change in Debt, Intercompany	-629		-3,984		-2,755
Dividends paid and returns of contributed capital	-6,275		-2,843		-2,431
Intercompany [Member] | Consolidation, Eliminations [Member]	'		'		'
Condensed Cash Flow Statements, Captions [Line Items]	'		'		'
Net (increase) decrease in finance receivables and loans	946		-4,113		-2,666
Net Change in Debt, Intercompany	-903		4,177		2,654
Dividends paid and returns of contributed capital	$10,542		$3,300		$2,638
[1]	The amounts are net of cash and cash equivalents of $1.6 billion at DecemberB 31, 2013, $147 million at DecemberB 31, 2012, and $88 million at December 31, 2011 of business units at the time of disposition.
[2]	Cash flows of discontinued operations are reflected within operating, investing, and financing activities in the Consolidated Statement of Cash Flows. The cash balance of these operations is reported as assets of operations held-for-sale on the Consolidated Balance Sheet.

Guarantees_and_Commitments_Gua

Guarantees and Commitments (Guarantees to third parties) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Guarantor Obligations [Line Items]	'	'
Default automotive repurchases	$0	$0
Standby letters of credit and other guarantees	30	44
Maximum [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Default automotive repurchases	0	1,897
Standby letters of credit and other guarantees	$142	$274

Guarantees_and_Commitments_Con

Guarantees and Commitments (Contractual financing commitments) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Guarantees [Abstract]	'	'
Commitment to sell mortgages or securities	$0	$6,282
Commitment to purchase or originate mortgages or securities	0	4,249
Commitment to provide capital to investees	63	86
Commitment to provide retail automotive receivables to third parties	0	425
Warehouse and construction lending commitments	187	100
Commitment to fund remaining unused balances on home equity lines of credit	388	411
Unused revolving credit line commitments	$1,062	$668

Guarantees_and_Commitments_Sch

Guarantees and Commitments (Schedule of Lease Commitments) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Guarantees [Abstract]	'	'	'
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$39	'	'
Operating Leases, Future Minimum Payments, Due in Two Years	34	'	'
Operating Leases, Future Minimum Payments, Due in Three Years	18	'	'
Operating Leases, Future Minimum Payments, Due in Four Years	5	'	'
Operating Leases, Future Minimum Payments, Due in Five Years	0	'	'
Operating Leases, Future Minimum Payments, Due Thereafter	0	'	'
Operating Leases, Future Minimum Payments Due	96	'	'
Operating Leases, Rent Expense	$47	$63	$79

Guarantees_and_Commitments_Oth

Guarantees and Commitments (Other Purchase Commitments) (Details) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Guarantees [Abstract]	'
Other Commitment, Due in Next Twelve Months	$76
Other Commitment, Due in Second and Third Year	2
Other Commitment	$78

Contingencies_and_Other_Risks_

Contingencies and Other Risks (Narrative - Mortgage-Related Matters) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Loss Contingency [Abstract]	'	'	'
ResCap settlement accrual	$0	$1,950	$750
ResCap settlement accrual for insurance proceeds	150	'	0
CFPB Settlement	98	'	'
Representation And Warranty Obligations Reserve Balance	$45	'	'

Quarterly_Financial_Statements1

Quarterly Financial Statements (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Quarterly Financial Statements [Abstract]	'	'	'	'	'	'	'	'	'		'		'
Net financing revenue (loss)	$774	$737	$628	$640	$611	$472	$457	$351	$2,779		$1,891		$1,124
Other revenue	325	371	402	386	480	775	714	605	1,484		2,574		2,288
Total net revenue (loss)	1,099	1,108	1,030	1,026	1,091	1,247	1,171	956	4,263		4,465		3,412
Provision for loan losses	140	141	89	131	93	105	33	98	501		329		161
Total noninterest expense	884	762	801	958	951	845	971	855	3,405		3,622		3,428
Income (loss) from continuing operations before income tax expense	75	205	140	-63	47	297	167	3	357		514		-177
Income tax expense (benefit) from continuing operations	-4	28	40	-123	-887	46	-16	1	-59		-856		42
Net income (loss) from continuing operations	79	177	100	60	934	251	183	2	416		1,370		-219
Income (loss) from discontinued operations, net of tax	25	-86	-1,027	1,033	466	133	-1,081	308	-55		-174		62
Net income (loss)	$104	$91	($927)	$1,093	$1,400	$384	($898)	$310	$361		$1,196		($157)
Net income (loss) from continuing operations, Per Basic Share	($270)	($18)	($75)	($105)	$551	$38	($13)	($149)	($468)		$427		($738)
Net (loss) income, Basic	($251)	($82)	($847)	$671	$901	$137	($825)	$82	($509)		$296		($691)
Net income (loss) from continuing operations, Per Diluted Share	($270)	($18)	($75)	($105)	$455	$38	($13)	($149)	($468)	[1]	$427	[1]	($738)	[1]
Net (loss) income, Diluted	($251)	($82)	($847)	$671	$700	$137	($825)	$82	($509)	[1]	$296	[1]	($691)	[1]
[1]	Due to the antidilutive effect of converting the Fixed Rate Cumulative Mandatorily Convertible Preferred Stock into common shares and the net loss from continuing operations attributable to common shareholders for 2013, and 2011, respectively, net (loss) income from continuing operations attributable to common shareholders and basic weighted-average common shares outstanding were used to calculate basic and diluted earnings per share.

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	Jan. 23, 2014	Jan. 22, 2014	Dec. 31, 2013	Dec. 31, 2013
			Series G Preferred Stock [Member]	Series A Preferred Stock [Member]
Subsequent Event [Line Items]	'	'	'	'
Shares Sold by U.S. Treasury	410,000	'	'	'
Proceeds of U.S. Treasury Private Placement	$3,000,000,000	'	'	'
Percentage of Shares held by U.S. Treasury	37.00%	'	'	'
Long-term Debt, Percentage Bearing Fixed Interest, Amount	'	750,000,000	'	'
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	'	3.50%	'	'
Cash dividend per share	'	'	$18.08	$0.53
Preferred stock dividend amount outstanding	'	'	$47,000,000	$22,000,000