Income Taxes - Provision (Benefit) for Income Taxes from Continuing Operations (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Expense Benefit Continuing Operations [Line Items]
United States Federal, Current	$ (1)	$ 8	$ 30
United States Federal, Deferred	156	103	(435)
Foreign, Current	453	941	2,012
Foreign, Deferred	79	186	(224)
Total Foreign Income Tax provision	532	1,127	1,788
Total provision before adjustment	744	1,247	1,414
Adjustment of deferred taxes for foreign income tax law changes		(682)	115
Provision (benefit) for income taxes	744	565	1,529
State [Member]
Income Tax Expense Benefit Continuing Operations [Line Items]
Provision (benefit) for income taxes	57	9	31
Federal and State [Member]
Income Tax Expense Benefit Continuing Operations [Line Items]
Provision (benefit) for income taxes	$ 212	$ 120	$ (374)