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Investments (Credit Losses Recognized In Earnings Related To OTTI Losses Recognized In Accumulated Other Comprehensive Income (Loss)) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Other than temporary impairment credit lossesfor available for sale securities rollforward [Abstract]        
Beginning Balance $ 22 $ 0 $ 16 $ 175
Additions For Credit Loss Impairments Recognized In The Current Period On Securities Not Previous Impaired 0 14 0 14
Additions For Credit Loss Impairments Recognized In The Current Period On Securities Previously Impaired 3 0 9 0
Reductions For Credit Loss Impairments Previously Recognized On Securities Sold During The Period 0 0 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 $ 25 $ 14 $ 25 $ 14