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Equity In Net Assets Of Nonconsolidated Affiliates Equity in net assets of nonconsolidated affiliates (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 3 Months Ended | 6 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
China JVs [Member]
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Jun. 30, 2011
China JVs [Member]
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Jun. 30, 2012
China JVs [Member]
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Jun. 30, 2011
China JVs [Member]
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Jun. 30, 2012
New Delphi [Member]
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Jun. 30, 2011
New Delphi [Member]
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Mar. 31, 2011
New Delphi [Member]
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Jun. 30, 2012
New Delphi [Member]
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Jun. 30, 2011
New Delphi [Member]
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Jun. 30, 2012
Other nonconsolidated affiliates [Member]
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Jun. 30, 2011
Other nonconsolidated affiliates [Member]
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Jun. 30, 2012
Other nonconsolidated affiliates [Member]
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Jun. 30, 2011
Other nonconsolidated affiliates [Member]
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Jun. 30, 2012
SGM [Member]
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Jun. 30, 2011
SGM [Member]
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Jun. 30, 2012
SGM Norsom [Member]
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Jun. 30, 2011
SGM Norsom [Member]
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Jun. 30, 2012
SGM DY [Member]
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Jun. 30, 2011
SGM DY [Member]
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Jun. 30, 2012
SGM DYPT [Member]
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Jun. 30, 2011
SGM DYPT [Member]
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Jun. 30, 2012
SGMW [Member]
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Jun. 30, 2011
SGMW [Member]
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Jun. 30, 2012
FAW-GM [Member]
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Jun. 30, 2011
FAW-GM [Member]
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Jun. 30, 2012
PATAC [Member]
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Jun. 30, 2011
PATAC [Member]
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Jun. 30, 2012
Shanghai Onstar [Member]
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Jun. 30, 2011
Shanghai Onstar [Member]
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Jun. 30, 2012
Shanghai Chengxin [Member]
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Jun. 30, 2011
Shanghai Chengxin [Member]
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Jun. 30, 2012
SGMS [Member]
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Mar. 31, 2011
HKJV [Member]
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Jun. 30, 2012
HKJV [Member]
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Jun. 30, 2012
HKJV [Member]
Level 3 [Member]
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Dec. 31, 2011
HKJV [Member]
Level 3 [Member]
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Jun. 30, 2011
VM Motori [Member]
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Jun. 30, 2012
Nonconsolidated Affiliates [Member]
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Jun. 30, 2011
Nonconsolidated Affiliates [Member]
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Jun. 30, 2012
Nonconsolidated Affiliates [Member]
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Jun. 30, 2011
Nonconsolidated Affiliates [Member]
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Dec. 31, 2011
Nonconsolidated Affiliates [Member]
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| Schedule of Equity Method Investments [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Equity income, net of tax and gain on disposal of investments | $ 300,000,000 | $ 382,000,000 | $ 723,000,000 | $ 2,526,000,000 | $ 331,000,000 | $ 379,000,000 | $ 750,000,000 | $ 829,000,000 | $ 0 | $ 0 | $ 0 | $ 1,727,000,000 | $ (31,000,000) | $ 3,000,000 | $ (27,000,000) | $ (30,000,000) | |||||||||||||||||||||||||||||||
| Dividends from nonconsolidated affiliates | 1,300,000,000 | 1,100,000,000 | 1,400,000,000 | 1,100,000,000 | |||||||||||||||||||||||||||||||||||||||||||
| Undistributed Earnings from Nonconsolidated Affiliates | 909,000,000 | 909,000,000 | 1,600,000,000 | ||||||||||||||||||||||||||||||||||||||||||||
| Direct ownership in investee | 100.00% | 49.00% | 49.00% | 25.00% | 25.00% | 25.00% | 25.00% | 25.00% | 25.00% | 44.00% | 44.00% | 50.00% | 50.00% | 50.00% | 50.00% | 40.00% | 40.00% | 33.00% | 33.00% | 49.00% | 50.00% | ||||||||||||||||||||||||||
| Equity Method Investment Ownership Percentage By Parent | 51.00% | 51.00% | 50.00% | ||||||||||||||||||||||||||||||||||||||||||||
| SGM Ownership Percent of Other JVs | 50.00% | 50.00% | 50.00% | 20.00% | 33.00% | ||||||||||||||||||||||||||||||||||||||||||
| SAIC Ownership Percent in Joint Ventures | 25.00% | 25.00% | 25.00% | ||||||||||||||||||||||||||||||||||||||||||||
| Proceeds from Sale of New Delphi | 3,800,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Percentage of New Delphi's Interests Issued and Outstanding | 100.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Maximum Obligation on Loan to New Delphi | 500,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Gain on sale of New Delphi Class A membership interest | 1,600,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Impairment of Equity Investment | 39,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Other Noncash Expense | 67,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Future Capital Injection | 173,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Put option, Fair Value | 94,000,000 | 88,000,000 | |||||||||||||||||||||||||||||||||||||||||||||
| Put option, Unrealized Losses | 70,000,000 | 64,000,000 | |||||||||||||||||||||||||||||||||||||||||||||
| Expected Payments to Acquire Additional Interest in HKJV | 125,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Expected Ownership Percentage by SAIC in HKJV | 9.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Goodwill allocated | 28,405,000,000 | 28,405,000,000 | 29,019,000,000 | 36,000,000 | |||||||||||||||||||||||||||||||||||||||||||
| Equity interest in VMM | $ 7,058,000,000 | $ 7,058,000,000 | $ 6,790,000,000 | $ 46,000,000 | |||||||||||||||||||||||||||||||||||||||||||