Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Provision for income taxes	$ (2,281,000,000)	$ 14,000,000	[1]
De-recognition of deferred tax liabilities	2,300,000,000
Income tax liabilities paid	0	$ 28,000,000
U.S. Federal Tax [Member]
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 0

[1] Prior to the spin-off, we had one operating and reportable segment, our ownership segment. Prior period presentation has been restated to reflect our current reportable segment.