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Acquisitions and Divestitures - Summary of Sales and Other Operating Revenue and Loss From Discontinued Operation Related to Disposition (Detail) (Argentina Divestiture [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Argentina Divestiture [Member]
Discontinued Operations [Line Items]
Revenues and other from discontinued operations	$ 0	$ 115	$ 87	$ 246
Loss from Argentina divestiture	0		(539)
Loss from operations in Argentina	0	(2)	(1)	(63)
Income tax benefit	0		23
Loss from discontinued operations, net of tax	$ 0	$ (2)	$ (517)	$ (63)

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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- Definition

Tax expense or benefit on other income (loss) amounts relating to a disposal group that is classified as a component of the entity, exclusive of the following elsewhere enumerated categories: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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