Investments (Schedule Of Changes in Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investments [Abstract]
Balance as of beginning of period	$ 424	$ 390	$ 319
Increases attributable to:
Credit losses on securities for which an OTTI was not previously recognized	39	108	55
Credit losses on securities for which an OTTI was previously recognized	43	62	71
Decreases attributable to:
Securities sold	(102)	(136)	(55)
Balance as of end of period	$ 404	$ 424	$ 390