Basis of Presentation- Additional Information (Detail) - USD ($) $ in Millions	Jul. 01, 2015	Mar. 31, 2016	Dec. 31, 2015
Basis Of Presentation [Line Items]
Other assets		$ 844	$ 744
ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs | Restatement Adjustment
Basis Of Presentation [Line Items]
Other assets			(13)
Long-term debt, excluding capital lease obligations			$ 13
Spinoff
Basis Of Presentation [Line Items]
Percentage of outstanding common stock distributed	80.50%
Record date for distribution	Jun. 17, 2015