Schedule of Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	$ 345		$ 334
Amortized Intangible Assets, Accumulated Amortization	59		42
Amortized Intangible Assets, Net Carrying Amount	286		292
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	375		353		76
License Agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	257	[1],[2]	252	[1],[2]
Amortized Intangible Assets, Accumulated Amortization	39	[1],[2]	29	[1],[2]
Amortized Intangible Assets, Net Carrying Amount	218	[1],[2]	223	[1],[2]
Customer Relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	86	[3],[4]	80	[3],[4]
Amortized Intangible Assets, Accumulated Amortization	19	[3],[4]	12	[3],[4]
Amortized Intangible Assets, Net Carrying Amount	67	[3],[4]	68	[3],[4]
Other Intangible Assets
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	2	[5]	2	[5]
Amortized Intangible Assets, Accumulated Amortization	1	[5]	1	[5]
Amortized Intangible Assets, Net Carrying Amount	1	[5]	1	[5]
Goodwill
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	375	[6]	353	[6]
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount	$ 445	[6]	$ 421	[6]

[1] Primarily amortized over a period ranging from 20 to 40 years.

[2] The increase relates to fluctuations in currency exchange rates and adjustments to the allocation of purchase price.

[3] Primarily amortized over a period ranging from 8 to 20 years.

[4] The increase primarily relates to adjustments to the allocation of purchase price.

[5] Primarily amortized over 27 years.

[6] The increase primarily relates to the Apex acquisition and adjustments to the allocation of purchase price.