Summary of Accounting Policies - Finite-Lived Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 47	$ 49
Accumulated Amortization	(28)	(27)
Customer Contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	8	8
Accumulated Amortization	(5)	(4)
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1	2
Accumulated Amortization	(1)	(2)
Technology Rights
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	29	29
Accumulated Amortization	(21)	(19)
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	9	10
Accumulated Amortization	$ (1)	$ (2)