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Liability For Unpaid Claims (Changes In Liability For Unpaid Claims) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Liability For Unpaid Claims [Abstract]      
Balance as of beginning-of-year $ 5,552 $ 5,335 $ 2,222
Reinsurance recoverable 152 143 57
Net balance as of beginning-of-year 5,400 5,192 2,165
Business acquired     2,842
Incurred related to:      
Current year 3,517 3,193 2,531
Interest 148 151 120
All other incurred (209) (308) (208)
Total incurred 3,456 3,036 2,443
Paid related to:      
Current year (1,707) (1,518) (1,197)
Prior years (1,366) (1,310) (1,061)
Total paid (3,073) (2,828) (2,258)
Net balance as of end-of-year 5,783 5,400 5,192
Reinsurance recoverable 151 152 143
Balance as of end-of-year $ 5,934 $ 5,552 $ 5,335