Summary of Accounting Policies - Finite-Lived Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 49	$ 48
Accumulated Amortization	(27)	(23)
Customer Contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	8	8
Accumulated Amortization	(4)	(4)
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2	3
Accumulated Amortization	(2)	(2)
Technology Rights
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	29	26
Accumulated Amortization	(19)	(15)
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	10	11
Accumulated Amortization	$ (2)	$ (2)