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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Investments [Abstract]
Balance as of beginning of period	$ 408	$ 437	$ 404	$ 424
Increases attributable to:
Credit losses on securities for which an OTTI was not previously recognized	1	19	2	20
Credit losses on securities for which an OTTI was previously recognized	3	5	7	21
Decreases attributable to:
Securities sold	(23)	(48)	(24)	(52)
Balance as of end of period	$ 389	$ 413	$ 389	$ 413