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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]        
Equity securities, impairment charge recognition within number of months   18 months    
Non-accrual status of loans after number of days past due   90 days    
Cash equivalents determination for original maturities of investments, maximum number of days   90 days    
Short-term investments determination for original maturities of investments, minimum number of days   90 days    
Unearned premiums, increase in earned premiums due to updated premium recognition factors for international mortgage insurance business   $ 0 $ 8 $ 6
Adoption of Stock Compensation Guidance | Subsequent Event        
Accounting Policies [Abstract]        
Deferred tax asset $ 9      
Effect of deferred tax asset increase retained earnings. $ 9      
Adoption of Debt Issuance Cost Guidance | Total Assets        
Accounting Policies [Abstract]        
Cumulative effect of new accounting principle in period of adoption       (42)
Adoption of Debt Issuance Cost Guidance | Other assets        
Accounting Policies [Abstract]        
Cumulative effect of new accounting principle in period of adoption       (42)
Adoption of Debt Issuance Cost Guidance | Liabilities, Total        
Accounting Policies [Abstract]        
Cumulative effect of new accounting principle in period of adoption       (42)
Adoption of Debt Issuance Cost Guidance | Long-term borrowings        
Accounting Policies [Abstract]        
Cumulative effect of new accounting principle in period of adoption       (27)
Adoption of Debt Issuance Cost Guidance | Non-Recourse Funding Obligations        
Accounting Policies [Abstract]        
Cumulative effect of new accounting principle in period of adoption       $ (15)
Non-cash | Derivative assets        
Accounting Policies [Abstract]        
Fair value of non-cash collateral received   24 86  
Subject to enforceable master netting arrangement        
Accounting Policies [Abstract]        
Fair value of non-cash collateral received   467 642  
Subject to enforceable master netting arrangement | Derivative liabilities        
Accounting Policies [Abstract]        
Fair value of collateral pledged [1]   557 263  
Subject to enforceable master netting arrangement | Derivative assets        
Accounting Policies [Abstract]        
Fair value of non-cash collateral received [2]   467 642  
Subject to enforceable master netting arrangement | Non Cash Collateral | Derivative liabilities        
Accounting Policies [Abstract]        
Fair value of collateral pledged   384 $ 263  
Subject to enforceable master netting arrangement | Cash Collateral | Derivative liabilities        
Accounting Policies [Abstract]        
Fair value of collateral pledged   $ 173    
[1] Included $5 million and $6 million of accruals on derivatives classified as other liabilities and does not include amounts related to embedded derivatives and derivatives related to securitization entities as of December 31, 2016 and 2015, respectively.
[2] Included $16 million and $24 million of accruals on derivatives classified as other assets and does not include amounts related to embedded derivatives as of December 31, 2016 and 2015, respectively.