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Liability For Unpaid Claims And Claim Adjustment Expenses - Information on Liability for Unpaid Claims (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Policy and contract claims, beginning $ 1,908 $ 1,854 $ 1,867 $ 1,870
Less: Unpaid claims balance, beginning – long-duration 233 203 241 213
Gross unpaid claims balance, beginning – short-duration 1,675 1,651 1,626 1,657
Less: Reinsurance recoverables, beginning 337 306 288 302
Net unpaid claims balance, beginning – short-duration 1,338 1,345 1,338 1,355
Acquisition from business combination, net of reinsurance 0 1 0 1
Add: incurred related to:        
Current accident year 304 407 595 750
Prior accident years 20 (14) 17 (32)
Total incurred claims 324 393 612 718
Less: paid claims related to:        
Current accident year 163 201 241 309
Prior accident years 145 142 355 369
Total paid claims 308 343 596 678
Net unpaid claims balance, ending – short-duration 1,354 1,396 1,354 1,396
Add: Reinsurance recoverables, ending 303 271 303 271
Gross unpaid claims balance, ending – short-duration 1,657 1,667 1,657 1,667
Add: Unpaid claims balance, ending – long duration 253 213 253 213
Policy and contract claims, ending $ 1,910 $ 1,880 $ 1,910 $ 1,880