Liability For Unpaid Claims (Changes In Liability For Unpaid Claims) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Liability For Unpaid Claims [Abstract]
Balance as of beginning-of-year	$ 5,934	$ 5,552	$ 5,335
Reinsurance recoverable	151	152	143
Net balance as of beginning-of-year	5,783	5,400	5,192
Incurred related to:
Current year	4,026	3,517	3,193
Interest	141	148	151
All other incurred	(271)	(209)	(308)
Total incurred	3,896	3,456	3,036
Paid related to:
Current year	(2,074)	(1,707)	(1,518)
Prior years	(1,472)	(1,366)	(1,310)
Total paid	(3,546)	(3,073)	(2,828)
Net balance as of end-of-period	6,133	5,783	5,400
Reinsurance recoverable	147	151	152
Balance as of end-of-period	$ 6,280	$ 5,934	$ 5,552