Liability For Unpaid Claims (Changes In Liability For Unpaid Claims) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Liability For Unpaid Claims [Abstract]
Balance as of beginning-of-year	$ 6,280	$ 5,934	$ 5,552
Reinsurance recoverable	147	151	152
Net balance as of beginning-of-year	6,133	5,783	5,400
Incurred related to:
Current year	3,875	4,026	3,517
Interest	159	141	148
All other incurred	(190)	(271)	(209)
Total incurred	3,844	3,896	3,456
Paid related to:
Current year	(1,951)	(2,074)	(1,707)
Prior years	(1,638)	(1,472)	(1,366)
Total paid	(3,589)	(3,546)	(3,073)
Net balance as of end-of-period	6,388	6,133	5,783
Reinsurance recoverable	143	147	151
Balance as of end-of-period	$ 6,531	$ 6,280	$ 5,934