Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Line Items]
Federal net operating loss carryforwards net of valuation allowances	$ 20
Foreign net operating loss carryforwards	690
Accumulated and undistributed earnings of foreign subsidiaries	1,100
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0	$ 1	$ 2
Internal Revenue Service (IRS)
Income Tax Disclosure [Line Items]
Federal net operating loss carryforwards net of valuation allowances	$ 3,500
Internal Revenue Service (IRS) | Maximum
Income Tax Disclosure [Line Items]
Operating loss carryforwards expiration period	Jan. 01, 2031
Other Tax [Member]
Income Tax Disclosure [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	$ 98