Acquisitions and Divestitures - Summary of Carrying Amount of Major Assets and Liabilities Associated with Disposition (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Current assets	$ 6,415us-gaap_AssetsCurrent	$ 6,366us-gaap_AssetsCurrent
Net property and equipment	48,076us-gaap_PropertyPlantAndEquipmentNet	51,005us-gaap_PropertyPlantAndEquipmentNet	51,659us-gaap_PropertyPlantAndEquipmentNet
Total assets	55,952us-gaap_Assets	61,637us-gaap_Assets	58,902us-gaap_Assets
LIABILITIES
Current debt		53us-gaap_DebtCurrent
Other current liabilities	2,417us-gaap_OtherLiabilitiesCurrent	2,611us-gaap_OtherLiabilitiesCurrent
Asset retirement obligations	3,048	3,101
Argentina Divestiture [Member]
ASSETS
Current assets		150
Net property and equipment		1,416
Other assets		12
Total assets		1,578
LIABILITIES
Current debt		51
Other current liabilities		95
Asset retirement obligations		91
Other long-term liabilities		21
Total liabilities		$ 258

Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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