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
	Mar. 31, 2014	Mar. 31, 2013
Other than temporary impairment credit lossesfor available for sale securities rollforward [Abstract]
Beginning Balance	$ 175	$ 197
Reductions For Credit Loss Impairments Previously Recognized On Securities Sold During The Period	(1)	(2)
Reductions For Increases In Cash Flows Expected To Be Collected Over The Remaining Life Of The Security	(1)	0
Ending Balance	$ 173	$ 195