Commitments, Contingencies, and Guarantees (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Recorded liabilities related to indemnification agreements	$ 7
Property Lease Guarantee [Member]
Aggregate amount of quantifiable indemnification agreements in effect for sales of business entities, assets and third party loans	77
Indemnification Agreement [Member]
Aggregate amount of quantifiable indemnification agreements in effect for sales of business entities, assets and third party loans	$ 702