Operating Leases, Commitments and Contingencies, and Guarantees (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating leases, rent expense	$ 50	$ 52	$ 51
Operating leases, sublease revenue	2	3	4
Maximum potential future lease payments and other related costs under guarantee on a real estate joint venture	134
Long term purchase committment, future minimum payments, total	13
Long term purchase committment, future minimum payments, current	4
Long term purchase committment, future minimum payments, due in two years	4
Long term purchase committment, future minimum payments, due thereafter	5
Aggregate amount of quantifiable indemnification agreements in effect for sales of business entities, assets and third party loans	764
Recorded liabilities related to indemnification agreements	$ 15	$ 16