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Netting Arrangements for Certain Financial Instruments and Securities Financing Activities - Summary of Maturities by Category of Collateral Pledged for Repurchase Agreements and Securities Loaned Transactions (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 927 $ 801
Securities loaned 314 223
Gross amount of recognized liabilities for repurchase agreements and securities loaned 1,241 1,024
Overnight and Continuous [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 555 771
Securities loaned 314 223
Gross amount of recognized liabilities for repurchase agreements and securities loaned 869 994
Less Than 30 Days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 370 30
Gross amount of recognized liabilities for repurchase agreements and securities loaned 370 30
30-89 Days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 2  
Gross amount of recognized liabilities for repurchase agreements and securities loaned 2  
Corporate Debt Securities [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements   30
Securities loaned 314 223
Corporate Debt Securities [Member] | Overnight and Continuous [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements   30
Securities loaned 314 223
U.S. Treasury and Agencies [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 150 60
U.S. Treasury and Agencies [Member] | Overnight and Continuous [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 150 60
Mortgage-Backed Securities Residential [Member] | Agency [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 777 711
Mortgage-Backed Securities Residential [Member] | Overnight and Continuous [Member] | Agency [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 405 681
Mortgage-Backed Securities Residential [Member] | Less Than 30 Days [Member] | Agency [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 370 $ 30
Mortgage-Backed Securities Residential [Member] | 30-89 Days [Member] | Agency [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 2