Acquisitions and Divestitures - Summary of Sales and Other Operating Revenue and Loss From Discontinued Operation Related to Disposition (Detail) (Argentina [Member], Argentina Divestiture [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014
Argentina [Member] \| 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 Argentina divestiture	(539)
Loss from operations in Argentina	(1)
Income tax benefit	23
Loss from discontinued operations, net of tax	$ (517)

Acquisitions and Divestitures - Summary of Sales and Other Operating Revenue and Loss From Discontinued Operation Related to Disposition (Detail) (Argentina [Member], Argentina Divestiture [Member], USD $)
In Millions, unless otherwise specified

3 Months Ended

Mar. 31, 2014

Argentina [Member] | 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 Argentina divestiture

(539)

Loss from operations in Argentina

(1)

Income tax benefit

Loss from discontinued operations, net of tax

$ (517)

- Definition

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.

+ References+ Details