Investments (Credit Losses Recognized In Earnings Related To OTTI Losses Recognized In Accumulated Other Comprehensive Income (Loss)) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other than temporary impairment credit lossesfor available for sale securities rollforward [Abstract]
Beginning Balance	$ 0	$ 186	$ 175	$ 197
Additions For Credit Loss Impairments Recognized In The Current Period On Securities Not Previous Impaired	14	0	14	0
Reductions For Credit Loss Impairments Previously Recognized On Securities Sold During The Period	0	(4)	(174)	(14)
Reductions For Increases In Cash Flows Expected To Be Collected Over The Remaining Life Of The Security	0	(4)	(1)	(5)
Ending Balance	$ 14	$ 178	$ 14	$ 178