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Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs and Asset Reconciliation (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Movement Analysis of Deferred Policy Acquisition Costs      
Deferred policy acquisition costs asset, beginning of period $ 1,093 $ 1,013 $ 916
Deferred Policy Acquisition Cost, Capitalization 1,790 1,530 1,427
Deferred Policy Acquisition Costs, Amortization Expense (1,641) (1,450) (1,330)
Deferred policy acquisition costs asset, end of period 1,242 1,093 1,013
Consolidated Property And Casualty Insurance Entity      
Movement Analysis of Deferred Policy Acquisition Costs      
Deferred policy acquisition costs asset, beginning of period 749 682 602
Deferred Policy Acquisition Cost, Capitalization 1,748 1,488 1,383
Deferred Policy Acquisition Costs, Amortization Expense (1,611) (1,421) (1,303)
Deferred policy acquisition costs asset, end of period 886 749 682
Life Insurance Segment      
Movement Analysis of Deferred Policy Acquisition Costs      
Deferred policy acquisition costs asset, beginning of period 344 331 314
Deferred Policy Acquisition Cost, Capitalization 42 42 44
Deferred Policy Acquisition Costs, Amortization Expense (30) (29) (27)
Deferred policy acquisition costs asset, end of period $ 356 $ 344 $ 331