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Segmented Information - Schedule of Information with Respect to Segment (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Equity loss	$ 196	$ 151	$ 121
Corporate and Other [Member] \| E-Car [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Equity loss		$ 35	$ 66

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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