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Liability for Policy and Contract Claims (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]        
Total liability for policy and contract claims $ 649 $ 652 $ 628 $ 683
Enact segment        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Total liability for policy and contract claims 508 518    
Life and Annuities segment        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Total liability for policy and contract claims 135 126    
Other mortgage insurance business        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Total liability for policy and contract claims $ 6 $ 8