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
	Mar. 31, 2014	Mar. 31, 2013
Investments [Abstract]
Balance as of beginning of period	$ 404	$ 424
Increases attributable to:
Credit losses on securities for which an OTTI was not previously recognized		1
Credit losses on securities for which an OTTI was previously recognized	4	16
Decreases attributable to:
Securities sold		(4)
Balance as of end of period	$ 408	$ 437