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Insurance Subsidiary Financial Information and Regulatory Matters - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
State
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2017
USD ($)
Statutory Accounting Practices [Line Items]        
Amount of dividend our subsidiaries could pay in 2019 without obtaining regulatory approval $ 500      
Statutory contingency reserve, annual additions, percentage of earned premiums, minimum 50.00%      
Minimum loss ratio requirement to hold statutory contingency reserve 35.00%      
Period of time when statutory contingency reserve has to be held, in years 10 years      
Statutory contingency reserve $ 1,600 $ 1,200    
U.S. Mortgage Insurance subsidiaries        
Statutory Accounting Practices [Line Items]        
Maximum risk-to-capital ratio 25      
Number of states with risk-to-capital requirements | State 15      
U.S. Mortgage Insurance        
Statutory Accounting Practices [Line Items]        
Percentage of available assets to PMIERs required assets 129.00% 121.00%    
Assets in excess of PMIERs requirements $ 750 $ 550    
Genworth Mortgage Insurance Corporation (GMICO)/PMIERs Capital Credit        
Statutory Accounting Practices [Line Items]        
Capital credit from reinsurance transaction $ 515      
Private mortgage insurer eligibility requirements 2.0 [Member]        
Statutory Accounting Practices [Line Items]        
Percentage of available assets to PMIERs required assets 120.00%      
Assets in excess of PMIERs requirements $ 550      
Guarantees provided to third parties        
Statutory Accounting Practices [Line Items]        
Maximum potential amount of future obligation 6 6    
Mexico Guarantee        
Statutory Accounting Practices [Line Items]        
Maximum potential amount of future obligation 175      
Domestic subsidiaries        
Statutory Accounting Practices [Line Items]        
Combined statutory capital and surplus 5,086 5,548    
Combined statutory net income (loss) 1,322 204 $ (320)  
Domestic subsidiaries | Captive life reinsurance subsidiaries        
Statutory Accounting Practices [Line Items]        
Combined statutory capital and surplus 217 245    
Combined statutory net income (loss) 1,520 (36) (403)  
Domestic subsidiaries | Life insurance        
Statutory Accounting Practices [Line Items]        
Impact of permitted practices on combined statutory capital and surplus $ 0 $ 0    
Consolidated RBC ratio 199.00% 282.00%    
International insurance subsidiaries        
Statutory Accounting Practices [Line Items]        
Dividends received from insurance subsidiaries $ 316 $ 301 457  
Combined statutory capital and surplus 4,600 5,000    
Combined statutory net income (loss) 421 548 536  
Surplus amount exceeding local solvency requirements 854 988    
Domestic insurance subsidiaries        
Statutory Accounting Practices [Line Items]        
Dividends received from insurance subsidiaries 60 36 80  
Domestic insurance subsidiaries | Extraordinary Dividend        
Statutory Accounting Practices [Line Items]        
Dividends received from insurance subsidiaries 0 0 $ 0  
Insurance Subsidiaries | Universal and term universal life insurance contracts | Virginia and Delaware        
Statutory Accounting Practices [Line Items]        
Additional statutory reserves 120 284    
Insurance Subsidiary | Long-term Care Insurance | NEW YORK        
Statutory Accounting Practices [Line Items]        
Additional statutory reserves   $ 188   $ 58
Insurance Subsidiary | Long-term Care Insurance | NEW YORK | To be recorded over the next two years        
Statutory Accounting Practices [Line Items]        
Additional statutory reserves 302      
Genworth Financial's Subsidiaries        
Statutory Accounting Practices [Line Items]        
Restricted net assets 12,100      
Genworth Holdings' Subsidiaries        
Statutory Accounting Practices [Line Items]        
Restricted net assets $ 11,200      
Genworth Mortgage Insurance Corporation (GMICO) | U.S. Mortgage Insurance subsidiaries        
Statutory Accounting Practices [Line Items]        
Risk-to-capital ratio 12.5 12.9    
Rivermont Insurance Company I        
Statutory Accounting Practices [Line Items]        
Maximum potential amount of future obligation $ 25      
Limited Guarantee Provided to a subsidiary 16 $ 4    
Genworth European Mortgage Insurance Business        
Statutory Accounting Practices [Line Items]        
Maximum potential amount of future obligation $ 1,500