Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended			24 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2012
Income Tax Disclosure [Line Items]
Unrecognized tax benefits	$ 1,780	$ 1,687	$ 147	$ 1,780	$ 46
Total income tax benefit recorded related to the Tronox-related contingent liability	2,877	(1,617)	(1,165)
Uncertain tax position	263	1,568	$ 72
Unrecognized tax benefits that would affect the effective tax rate on income if recognized	1,337			1,337
Unrecognized tax benefits that would be in the form of tax credits and net operating loss carryforwards	395			395
Accrued interest related to uncertain tax positions	11	9		11
Interest and penalties recognized in income tax expense (benefit)	2	$ 1
Minimum [Member]
Income Tax Disclosure [Line Items]
Unrecognized tax benefits expected to reverse within the next 12 months due to expiration of statutes of limitation and audit settlements	400			400
Maximum [Member]
Income Tax Disclosure [Line Items]
Unrecognized tax benefits expected to reverse within the next 12 months due to expiration of statutes of limitation and audit settlements	410			410
Portion Of Unrecognized Tax Benefits With Highly Certain Deductibility [Member]
Income Tax Disclosure [Line Items]
Unrecognized tax benefits	1,756			1,756
Portion Of Unrecognized Tax Benefits With Highly Certain Deductibility And Uncertain Timing [Member]
Income Tax Disclosure [Line Items]
Unrecognized tax benefits	24			24
Tronox Litigation [Member] | Judicial Ruling [Member]
Income Tax Disclosure [Line Items]
Total income tax benefit recorded related to the Tronox-related contingent liability				$ 576
Uncertain tax position	$ 1,300