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Ally Financial (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 3 Months Ended | ||||||||||||||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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Jun. 30, 2012
Ally Financial [Member]
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Mar. 31, 2012
Ally Financial [Member]
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Jun. 30, 2011
Ally Financial [Member]
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Jun. 30, 2012
Ally Financial [Member]
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Jun. 30, 2011
Ally Financial [Member]
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Dec. 31, 2011
Ally Financial [Member]
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Dec. 31, 2011
Common Stock [Member]
Ally Financial [Member]
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Jun. 30, 2012
Common Stock [Member]
Ally Financial [Member]
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Mar. 31, 2011
Preferred Stock [Member]
Ally Financial [Member]
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Jun. 30, 2012
Residual support [Member]
Ally Financial [Member]
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Dec. 31, 2011
Residual support [Member]
Ally Financial [Member]
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Jun. 30, 2012
Risk sharing [Member]
Ally Financial [Member]
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Dec. 31, 2011
Risk sharing [Member]
Ally Financial [Member]
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Jun. 30, 2012
Vehicle repurchase obligations [Member]
Ally Financial [Member]
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Dec. 31, 2011
Vehicle repurchase obligations [Member]
Ally Financial [Member]
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| Summary of Financial Statement Effects and Maximum Obligations [Abstract] | ||||||||||||||||||||
| Market Incentive Programs, Liabilities(recievables) Recorded | $ 19,000,000 | $ (6,000,000) | $ 8,000,000 | $ 66,000,000 | ||||||||||||||||
| Market Incentive Programs, Maximum Obligation | 87,000,000 | 40,000,000 | 17,000,000 | 88,000,000 | ||||||||||||||||
| Vehicle Repurchase, Maximum obligations | 21,989,000,000 | 19,779,000,000 | ||||||||||||||||||
| Vehicle Repurchase, Fair value of guarantee | 16,000,000 | 17,000,000 | ||||||||||||||||||
| Favorable Adjustments to Residual and Risk Sharing Liabilities | 73,000,000 | 323,000,000 | ||||||||||||||||||
| Marketing Incentive Program Payments and Fee Income [Abstract] | ||||||||||||||||||||
| U.S. Marketing incentives and operating lease residual payments | 477,000,000 | 425,000,000 | 811,000,000 | 970,000,000 | ||||||||||||||||
| Exclusivity fee income | 18,000,000 | 22,000,000 | 38,000,000 | 46,000,000 | ||||||||||||||||
| Summary of Balance Sheet Effects [Abstract] | ||||||||||||||||||||
| Accounts and Notes Receivable, Net | 257,000,000 | 257,000,000 | 243,000,000 | |||||||||||||||||
| Accounts Payable | 31,000,000 | 31,000,000 | 59,000,000 | |||||||||||||||||
| Short-term debt and current portion of long-term debt | 925,000,000 | 925,000,000 | 1,068,000,000 | |||||||||||||||||
| Accrued Liabilities and other liabilities | 833,000,000 | 833,000,000 | 650,000,000 | |||||||||||||||||
| Long-term Debt | 8,000,000 | 8,000,000 | 8,000,000 | |||||||||||||||||
| Other Liabilities, Noncurrent | 12,735,000,000 | 12,735,000,000 | 12,442,000,000 | 27,000,000 | 27,000,000 | 35,000,000 | ||||||||||||||
| Summary of Income Statement Effects [Abstract] | ||||||||||||||||||||
| Total net sales and revenue | 37,127,000,000 | 39,043,000,000 | 74,455,000,000 | 74,942,000,000 | (535,000,000) | (43,000,000) | (1,285,000,000) | (617,000,000) | ||||||||||||
| Automotive cost of sales and other automotive expenses | 3,000,000 | 4,000,000 | 7,000,000 | 8,000,000 | ||||||||||||||||
| Interest income and other non-operating income, net | 139,000,000 | 308,000,000 | 414,000,000 | 912,000,000 | 20,000,000 | 29,000,000 | 42,000,000 | 85,000,000 | ||||||||||||
| Automotive interest expense | 118,000,000 | 155,000,000 | 228,000,000 | 304,000,000 | 14,000,000 | (21,000,000) | 19,000,000 | 8,000,000 | 37,000,000 | |||||||||||
| Investment in Ally Financial [Abstract] | ||||||||||||||||||||
| Total common equity ownership in investee | 9.90% | 9.90% | ||||||||||||||||||
| Impairment charge on Ally Financial common stock | 555,000,000 | |||||||||||||||||||
| Carrying amount of investment Ally Financial common stock | 403,000,000 | 404,000,000 | ||||||||||||||||||
| Fair Value of investment in Ally Financial common stock | 403,000,000 | 436,000,000 | ||||||||||||||||||
| Proceeds from Sale of Ally Financial Preferred Stock | 1,000,000,000 | |||||||||||||||||||
| Gain on sale of Ally Financial preferred stock | $ 339,000,000 | |||||||||||||||||||