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Liability For Unpaid Claims (Changes In Liability For Unpaid Claims) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Liability For Unpaid Claims [Abstract]    
Balance as of beginning-of-year $ 6,280 $ 5,934
Reinsurance recoverable 147 151
Net balance as of beginning-of-year 6,133 5,783
Incurred related to:    
Current year 1,060 1,025
Interest 39 42
All other incurred (75) (101)
Total incurred 1,024 966
Paid related to:    
Current year (297) (302)
Prior years (663) (601)
Total paid (960) (903)
Net balance as of end-of-period 6,197 5,846
Reinsurance recoverable 145 151
Balance as of end-of-period $ 6,342 $ 5,997