Commitments, Contingencies, and Guarantees (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
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	17
Long term purchase committment, future minimum payments, current	8
Long term purchase commitment, future minimum payments, due in two years	3
Long term purchase committment, future minimum payments, due thereafter	6
Aggregate amount of quantifiable indemnification agreements in effect for sales of business entities, assets and third party loans	763
Recorded liabilities related to indemnification agreements	$ 15	$ 15