Investments (Schedule Of Changes in Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments [Abstract]
Balance as of beginning of period	$ 382	$ 408	$ 380	$ 404
Increases attributable to:
Credit losses on securities for which an OTTI was not previously recognized	3	1	16	2
Credit losses on securities for which an OTTI was previously recognized	4	3	6	7
Decreases attributable to:
Securities sold	(15)	(23)	(28)	(24)
Balance as of end of period	$ 374	$ 389	$ 374	$ 389