Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax [Line Items]
Net operating loss carryforwards	$ 788,000,000	$ 807,000,000
Deferred tax assets, gross tax credit carry forwards	$ 130,000,000	157,000,000
Operating loss carryforwards year of expiration	2017
Tax credit carryforward expiration	2017
Valuation allowance related to operating loss and tax credit carryforwards	$ 99,000,000	124,000,000
Valuation allowance	13,000,000	20,000,000
Income tax expense (benefit) for non-US subsidiaries	0
Excess book value of its investment	3,000,000,000
Liabilities for unrecognized income tax benefits	432,000,000	461,000,000	$ 452,000,000	$ 475,000,000
Unrecognized tax benefits	33,000,000	$ 34,000,000
Minimum
Income Tax [Line Items]
Reduction in uncertain tax positions	12,000,000
Maximum
Income Tax [Line Items]
Reduction in uncertain tax positions	$ 20,000,000