Liability For Unpaid Claims (Changes In Liability For Unpaid Claims) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Liability For Unpaid Claims [Abstract]
Balance as of beginning-of-year	$ 5,552	$ 5,335
Reinsurance recoverable	152	143
Net balance as of beginning-of-year	5,400	5,192
Incurred related to:
Current year	1,742	1,577
Interest	82	80
All other incurred	(127)	(144)
Total incurred	1,697	1,513
Paid related to:
Current year	(654)	(593)
Prior years	(847)	(810)
Total paid	(1,501)	(1,403)
Net balance as of end-of-year	5,596	5,302
Reinsurance recoverable	155	147
Balance as of end-of-year	$ 5,751	$ 5,449