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Credit and Other Debt Agreements - Summary of Corporate and Other Debt (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Total corporate and other debt $ 12,999 $ 13,099
Less unamortized debt acquisition costs and discount (126) (129)
Net corporate and other debt 12,873 12,970
Premium Financing Debt Facility    
Debt Instrument [Line Items]    
Total corporate and other debt 156 226
Senior Notes:    
Debt Instrument [Line Items]    
Total corporate and other debt 9,550 9,550
Note Purchase Agreements    
Debt Instrument [Line Items]    
Total corporate and other debt 3,008 3,323
Credit Agreement    
Debt Instrument [Line Items]    
Total corporate and other debt $ 285 $ 0