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Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs and Asset Reconciliation (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Movement Analysis of Deferred Policy Acquisition Costs    
Deferred policy acquisition costs asset, beginning of period $ 1,242 $ 1,093
Capitalized deferred policy acquisition costs 497 417
Amortized deferred policy acquisition costs (442) (367)
Deferred policy acquisition costs asset, end of period 1,297 1,143
Consolidated Property And Casualty Insurance    
Movement Analysis of Deferred Policy Acquisition Costs    
Deferred policy acquisition costs asset, beginning of period 886 749
Capitalized deferred policy acquisition costs 485 407
Amortized deferred policy acquisition costs (434) (360)
Deferred policy acquisition costs asset, end of period 937 796
Life Insurance Segment    
Movement Analysis of Deferred Policy Acquisition Costs    
Deferred policy acquisition costs asset, beginning of period 356 344
Capitalized deferred policy acquisition costs 12 10
Amortized deferred policy acquisition costs (8) (7)
Deferred policy acquisition costs asset, end of period $ 360 $ 347