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Investments (Schedule Of Changes in Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Investments [Abstract]    
Balance as of beginning-of-period $ 244 $ 337
Increases attributable to:    
Credit losses on securities for which an OTTI was not previously recognized 1 11
Credit losses on securities for which an OTTI was previously recognized 1 3
Decreases attributable to:    
Securities sold, paid down or matured (37) (142)
Balance as of end-of-period $ 209 $ 209