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Borrowings and Other Financings - Long Term Borrowings (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Total $ 1,564 $ 1,584
Genworth Holdings    
Debt Instrument [Line Items]    
Long-term borrowings 836 854
Bond consent fees (9) (9)
Deferred borrowing charges (5) (6)
Total 822 839
Genworth Holdings | 6.50% Senior Notes, Due 2034    
Debt Instrument [Line Items]    
Long-term borrowings 262 262
Genworth Holdings | Floating Rate Junior Subordinated Notes, due 2066    
Debt Instrument [Line Items]    
Long-term borrowings 574 592
Enact Holdings | 6.50% Senior Notes, Due 2025    
Debt Instrument [Line Items]    
Long-term borrowings 0 750
Deferred borrowing charges   (5)
Total   745
Enact Holdings | 6.25% Senior Notes, due 2029    
Debt Instrument [Line Items]    
Long-term borrowings 750 $ 0
Deferred borrowing charges (8)  
Total $ 742