Commitments, Contingencies, And Guarantees (Narrative) (Detail) (USD $)	3 Months Ended
	Jun. 30, 2014	Sep. 30, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Carrying value of limited partnerships and partially-owned investment companies included in other investments		$ 2,100,000,000
Funding commitments relating to limited partnerships and partially-owned investment companies		903,000,000
Repurchase obligations		1,401,000,000	1,401,000,000
Securities lending payable		1,441,000,000	1,633,000,000
Securities lending collateral		1,440,000,000	1,632,000,000
Unrecognized tax benefits		28,000,000
Derivative liability subject to a master netting agreement		25,000,000	41,000,000
Amount of credit facility not renewed by the company	$ 500,000,000