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Segment Information - Additional Information (Detail)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting Information [Line Items]          
Number of operating segments | Segment     3    
Assumed tax rate on adjustments to adjusted operating income     21.00% 21.00%  
Expenses related to restructuring     $ 34 $ 3 $ 4
Pre-tax gain (loss) on early extinguishment of debt     (45) (9) 0
Initial loss from life block transaction   $ 92 92 0 $ 0
Floating Rate Subordinated Notes Due in 2050 | Non-Recourse Funding Obligations          
Segment Reporting Information [Line Items]          
Pre-tax gain (loss) on early extinguishment of debt $ 4        
Redemption of secured debt $ 315        
Debt instrument, maturity year 2050        
Genworth Holdings          
Segment Reporting Information [Line Items]          
Pre-tax make-whole expense $ 9        
Debt instrument, maturity month and year 2020-06        
Genworth Holdings | Senior Notes 2023 and 2024          
Segment Reporting Information [Line Items]          
Pre-tax gain (loss) on early extinguishment of debt   15      
Genworth Holdings | Senior Notes 2021          
Segment Reporting Information [Line Items]          
Pre-tax gain (loss) on early extinguishment of debt     4 4  
Pre-tax make-whole expense     6    
Aggregate principal amount of notes repurchased   146 $ 146 $ 84  
Debt instrument, maturity year     2021 2021  
Debt instrument, maturity month and year     2021-09    
Genworth Holdings | Senior Notes 2023          
Segment Reporting Information [Line Items]          
Pre-tax make-whole expense     $ 20    
Aggregate principal amount of notes repurchased   91 $ 91    
Debt instrument, maturity year     2023    
Debt instrument, maturity month and year     2023-08    
Genworth Holdings | Senior Notes 2024          
Segment Reporting Information [Line Items]          
Aggregate principal amount of notes repurchased   $ 118 $ 118    
Debt instrument, maturity year     2024