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Acquisitions and Divestitures - Divestitures (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Gain (Loss) on Sale of Property [Abstract]
Proceeds from divestitures	$ 361	$ 47
Net gains (losses) on divestitures	$ 144	$ (17)

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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