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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Policy and contract claims, beginning $ 1,910 $ 1,880 $ 1,867 $ 1,870
Less: Unpaid claims balance, beginning – long-duration 253 213 241 213
Gross unpaid claims balance, beginning – short-duration 1,657 1,667 1,626 1,657
Less: Reinsurance recoverables, beginning 303 271 288 302
Net unpaid claims balance, beginning – short-duration 1,354 1,396 1,338 1,355
Acquisition from business combination, net of reinsurance 0 0 0 1
Add: incurred related to:        
Current accident year 242 354 837 1,104
Prior accident years 18 (7) 35 (39)
Total incurred claims 260 347 872 1,065
Less: paid claims related to:        
Current accident year 166 232 407 541
Prior accident years 129 109 484 478
Total paid claims 295 341 891 1,019
Net unpaid claims balance, ending – short-duration 1,319 1,402 1,319 1,402
Add: Reinsurance recoverables, ending 212 300 212 300
Gross unpaid claims balance, ending – short-duration 1,531 1,702 1,531 1,702
Add: Unpaid claims balance, ending – long duration 280 201 280 201
Policy and contract claims, ending $ 1,811 $ 1,903 $ 1,811 $ 1,903