Investments (Credit Losses Recognized In Earnings Related To OTTI Losses Recognized In Accumulated Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other than temporary impairment credit lossesfor available for sale securities rollforward [Abstract]
Beginning Balance	$ 16	$ 173	$ 16	$ 175
Additions For Credit Loss Impairments Recognized In The Current Period On Securities Previously Impaired	6	0	6	0
Reductions For Credit Loss Impairments Previously Recognized On Securities Sold During The Period	0	(173)	0	(174)
Reductions For Increases In Cash Flows Expected To Be Collected Over The Remaining Life Of The Security	0	0	0	(1)
Ending Balance	$ 22	$ 0	$ 22	$ 0