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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
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Roll-Forward Of Pre-Tax Credit Losses Related To Fixed Maturities For Which Portion Of OTTI Was Recognized In OCI    
Balance of credit losses related to securities still held-beginning of period $ 34 $ 22
Additions where no OTTI was previously recorded 33 20
Additions where an OTTI was previously recorded 4 5
Reductions for securities sold during the period (41) (13)
Balance of credit losses related to securities still held-end of period $ 30 $ 34