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Operating Leases, Commitments and Contingencies, and Guarantees (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating leases, rent expense $ 52 $ 50 $ 52
Operating leases, sublease revenue 2 2 3
Maximum potential future lease payments and other related costs under guarantee on a real estate joint venture 111    
Unrecorded unconditional purchase obligation, total 7    
Unrecorded unconditional purchase obligation, due within one year 2    
Unrecorded unconditional purchase obligation, due within two years 2    
Unrecorded unconditional purchase obligation, due thereafter 3    
Aggregate amount of quantifiable indemnification agreements in effect for sales of business entities, assets and third party loans 725    
Recorded liabilities related to indemnification agreements $ 7 $ 15