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Summary of Activities Related to Restructuring Charges (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 576
Discontinued Operations
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 55

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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