Commitments, Contingencies, and Guarantees (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Aggregate amount of quantifiable indemnification agreements in effect for sales of business entities, assets and third party loans	$ 1,900
Recorded liabilities related to indemnification agreements	12	7
Property Lease Guarantee [Member]
Loss Contingencies [Line Items]
Aggregate amount of quantifiable indemnification agreements in effect for sales of business entities, assets and third party loans	60
Indemnification Agreement [Member]
Loss Contingencies [Line Items]
Aggregate amount of quantifiable indemnification agreements in effect for sales of business entities, assets and third party loans	324
Guarantee Obligations [Member]
Loss Contingencies [Line Items]
Aggregate amount of quantifiable indemnification agreements in effect for sales of business entities, assets and third party loans	$ 375