Acquisitions and Divestitures - Summary of Sales and Other Operating Revenue and Loss From Discontinued Operation Related to Disposition (Detail) - Argentina [Member] - USD ($) $ in Millions		6 Months Ended
Mar. 12, 2014	Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (Loss) from discontinued operations, net of tax	$ (517)
Argentina Divestiture [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues and other from discontinued operations		$ 87
Loss from divestiture		(539)
Income (loss) from divested operations		(1)
Income tax benefit (expense)		23
Income (Loss) from discontinued operations, net of tax		$ (517)

Other income (loss) amounts, net of tax expense or benefit, 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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Other pretax 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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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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