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Income and Mining Tax Benefit (Expense) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current: United States	$ (129)	$ (210)	$ (346)
Current: Foreign	(372)	(644)	(1,038)
Current income taxes	(501)	(854)	(1,384)
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred: United States	805	100	151
Deferred: Foreign	451	(122)	486
Deferred income taxes	1,256	(22)	637
Income tax expense	$ 755	$ (876)	$ (747)

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.