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Borrowings and Other Financings - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jan. 21, 2020
May 22, 2018
Mar. 07, 2018
Jan. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 04, 2018
Nonrecourse Funding Obligations [Line Items]                
Broker, advisor and investment banking fees           $ 6,000,000    
Net proceeds of from senior secured term loan facility         $ 0 441,000,000 $ 0  
Non-recourse funding obligationsTotal         $ 311,000,000 311,000,000    
Repayment of investment securities under repurchase agreements             75,000,000  
Cash and government securities collateral, minimum amount of the fair value of the applicable securities loaned         102.00%      
Securities lending activity, fair value of securities loaned         $ 49,000,000 99,000,000    
Securities lending activity, fair value of collateral held         51,000,000 102,000,000    
Securities lending activity, obligation to return collateral         51,000,000 102,000,000    
Interest paid         $ 292,000,000 $ 309,000,000 $ 301,000,000  
Non-Recourse Funding Obligations | Floating Rate Subordinated Notes Due in 2050                
Nonrecourse Funding Obligations [Line Items]                
Redemption of secured debt       $ 315,000,000        
pre-tax loss       $ 4,000,000        
Rivermont Life Insurance Company I Due 2050                
Nonrecourse Funding Obligations [Line Items]                
Weighted average interest rate         3.78% 4.49%    
Borrowing costs that were deferred         $ 4,000,000 $ 4,000,000    
Debt instrument, maturity year         2050      
Non-recourse funding obligationsTotal         $ 311,000,000 311,000,000    
Interest rate reset period, number of days         28 days      
Genworth Holdings                
Nonrecourse Funding Obligations [Line Items]                
Borrowing costs that were deferred         $ 12,000,000 21,000,000    
Total Fees related to Consent Solicitation           11,000,000    
Bond consent fees         25,000,000 32,000,000   $ 5,000,000
Broker, advisor and investment banking fees           $ 6,000,000    
Genworth Holdings | Senior Secured Term Loan Facility                
Nonrecourse Funding Obligations [Line Items]                
Debt instrument, maturity date     Mar. 07, 2023          
Redemption of secured debt         $ 445,000,000      
Genworth Holdings | Fixed Rate Senior Notes | Minimum                
Nonrecourse Funding Obligations [Line Items]                
Interest rate         4.80%      
Senior notes option to redeem         100.00%      
Genworth Holdings | Fixed Rate Senior Notes | Maximum                
Nonrecourse Funding Obligations [Line Items]                
Interest rate         7.70%      
Genworth Holdings | Junior Notes, due 2066                
Nonrecourse Funding Obligations [Line Items]                
Issued notes, aggregate principal amount         $ 598,000,000      
Debt instrument, maturity month and year         2066-11      
Quarterly floating interest rate after November 15, 2016         three-month London Interbank Offered Rate (“LIBOR”) plus 2.0025%      
Scheduled redemption date         Nov. 15, 2036      
Right to defer the payment of interest on the 2066 Notes during period, years         10 years      
Genworth Holdings | 6.52% Senior Notes, Due 2018                
Nonrecourse Funding Obligations [Line Items]                
Interest rate   6.52%            
Debt instrument, maturity month and year   2018-05            
Net proceeds of from senior secured term loan facility   $ 441,000,000            
Cash on hand   175,000,000            
Repayment of senior notes   616,000,000            
Aggregate principal amount of notes repurchased   $ 597,000,000            
Genworth Holdings | 7.70% Senior Notes, Due 2020                
Nonrecourse Funding Obligations [Line Items]                
Interest rate 7.70%       7.70% 7.70%    
Debt instrument, maturity month and year 2020-06              
Early redemption of senior notes $ 409,000,000              
Pre-tax make-whole expense on redemption of senior notes 9,000,000              
Debt instrument, maturity year         2020 2020    
Aggregate principal amount of notes repurchased 397,000,000              
Interest paid $ 3,000,000              
Genworth Financial Mortgage Insurance Pty Limited                
Nonrecourse Funding Obligations [Line Items]                
Term Loan variable interest rate         3.50%      
Borrowing costs that were deferred           $ 1,000,000    
Debt instrument, maturity year         2025