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Investments (Roll-Forward Of Pre-Tax Credit Losses Related To Fixed Maturities For Which Portion Of Other-Than-Temporary Impairment Was Recognized In Other Comprehensive Income) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Roll-Forward Of Pre-Tax Credit Losses Related To Fixed Maturities For Which Portion Of Other-Than-Temporary Impairment Was Recognized In Other Comprehensive Income [Roll Forward]        
Balance of credit losses related to securities still held – beginning of period $ 23 $ 24 $ 28 $ 37
Additions where no OTTI was previously recorded 8 2 15 9
Additions where an OTTI was previously recorded 6 2 8 5
Reductions for securities sold during the period (5) (11) (19) (34)
Balance of credit losses related to securities still held – end of period $ 32 $ 17 $ 32 $ 17