Commitments, Contingencies, And Guarantees (Narrative) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Carrying value of limited partnerships and partially-owned investment companies included in other investments	$ 2,000,000,000
Funding commitments relating to limited partnerships and partially-owned investment companies	1,000,000,000
Derivative asset subject to a master netting agreement	10,000,000	41,000,000
Repurchase obligations	1,401,000,000	1,401,000,000
Securities lending payable	1,551,000,000	1,633,000,000
Securities lending collateral	1,550,000,000	1,632,000,000
Unrecognized tax benefits	$ 26,000,000