Investments (Schedule Of Changes in Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Investments [Abstract]
Balance as of beginning of period	$ 389	$ 413	$ 404	$ 424
Increases attributable to:
Credit losses on securities for which an OTTI was not previously recognized	1	6	2	26
Credit losses on securities for which an OTTI was previously recognized	4	16	12	37
Decreases attributable to:
Securities sold	(17)	(16)	(41)	(68)
Balance as of end of period	$ 377	$ 419	$ 377	$ 419