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Segmented Information - Share of E-Car Partnership (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Total sales	$ 30,837	$ 28,748	$ 23,465
Equity loss	151	121	132
Adjusted EBIT	1,750	1,217	1,197
North America [Member]
Segment Reporting Information [Line Items]
Total sales	16,335	14,855	12,370
Adjusted EBIT	1,521	1,373	1,116
Europe [Member]
Segment Reporting Information [Line Items]
Total sales	12,709	12,556	10,289
Adjusted EBIT	165	(22)	117
Segment Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total sales	(318)	(262)	(210)
Adjusted EBIT	0	(40)	(94)
Reportable Segment [Member]
Segment Reporting Information [Line Items]
Total sales	30,837	28,748	23,465
Adjusted EBIT	1,658	1,367	1,211
E-Car [Member]
Segment Reporting Information [Line Items]
Total sales	91	92	20
E-Car [Member] | North America [Member]
Segment Reporting Information [Line Items]
Total sales	12	0	0
Equity loss	0	0	0
Amortization of intangibles	52	0	0
Adjusted EBIT	(76)	0	0
E-Car [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Total sales	12	0	0
Equity loss	0	0	0
Amortization of intangibles	0	0	0
Adjusted EBIT	(6)	0	0
E-Car [Member] | Segment Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total sales	0	0	8
Equity loss	35	66	30
Amortization of intangibles	0	0	0
Adjusted EBIT	(35)	(66)	(80)
E-Car [Member] | Reportable Segment [Member]
Segment Reporting Information [Line Items]
Total sales	24	0	8
Equity loss	35	66	30
Amortization of intangibles	52	0	0
Adjusted EBIT	$ (117)	$ (66)	$ (80)

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-Name Statement of Financial Accounting Standard (FAS)

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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