Investments (Schedule Of Changes in Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Investments [Abstract]
Balance as of beginning of period	$ 374	$ 389	$ 380	$ 404
Increases attributable to:
Credit losses on securities for which an OTTI was not previously recognized		1	16	2
Credit losses on securities for which an OTTI was previously recognized	5	4	12	12
Decreases attributable to:
Securities sold	(1)	(17)	(30)	(41)
Balance as of end of period	$ 378	$ 377	$ 378	$ 377