Investments (Schedule Of Changes in Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)) (Details) - Fixed Maturity AFS Securities [Member]	12 Months Ended
	Dec. 31, 2019 USD ($)
Balance as of beginning-of-year	$ 355,000,000
Increases attributable to:
Credit losses on securities for which an OTTI was not previously recognized	13,000,000
Credit losses on securities for which an OTTI was previously recognized	3,000,000
Decreases attributable to:
Securities sold, paid down or matured	(160,000,000)
Balance as of end-of-year	$ 211,000,000