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, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
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	$ 43	$ 74	$ 137
Additions where no OTTI was previously recorded	9	8	12
Additions where an OTTI was previously recorded	3	12	8
Reductions for securities sold during the period	(18)	(51)	(83)
Balance of credit losses related to securities still held-end of period	$ 37	$ 43	$ 74