Investments (Credit Losses Recognized In Earnings on Fixed Maturity Securities Held by the Company) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Credit losses recognized in earnings on fixed maturity securities
Balance, beginning of period	$ 543	$ 773	$ 532	$ 781
Credit loss impairments previously recognized on securities which matured, paid down, prepaid or were sold during the period	(131)	(15)	(141)	(28)
Credit loss impairments previously recognized on securities impaired to fair value during the period	0	(12)	(2)	(13)
Credit loss impairments recognized in the current period on securities not previously impaired	7	0	27	3
Additional credit loss impairments recognized in the current period on securities previously impaired	0	2	0	2
Increases due to the passage of time on previously recorded credit losses	7	7	12	13
Accretion of credit loss impairments previously recognized due to an increase in cash flows expected to be collected	(2)	(4)	(4)	(7)
Balance, end of period	$ 424	$ 751	$ 424	$ 751