Fair Value Measurements (Narrative) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Disclosure Fair Value Measurements Narrative [Abstract]
Net Assets Measured At Fair Value On A Recurring Basis	$ 2,500,000,000	$ 2,100,000,000
Net Assets Measured At Fair Value On A Recurring Basis Measured Using Unobservable Input And Classified As Level3	$ 88,000,000	$ (31,000,000)