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Commitments and Contingent Liabilities - Significant Industry Concentrations Related to Credit Exposure (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans [1] $ 63,703 $ 59,132
Financial institutions    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 15,899 13,319
Unfunded commitments 36,000  
Total exposure 51,900  
Financial institutions | Securities industry    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 3,100  
Unfunded commitments 20,600  
Total exposure 23,700  
Financial institutions | Banks    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 9,400  
Unfunded commitments 2,100  
Total exposure 11,500  
Financial institutions | Asset managers    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 2,000  
Unfunded commitments 5,600  
Total exposure 7,600  
Financial institutions | Insurance    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 200  
Unfunded commitments 4,500  
Total exposure 4,700  
Financial institutions | Government    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 100  
Unfunded commitments 1,900  
Total exposure 2,000  
Financial institutions | Other    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 1,100  
Unfunded commitments 1,300  
Total exposure 2,400  
Commercial    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 2,342 $ 1,642
Unfunded commitments 18,200  
Total exposure 20,500  
Commercial | Manufacturing    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 600  
Unfunded commitments 6,300  
Total exposure 6,900  
Commercial | Services and other    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 800  
Unfunded commitments 5,500  
Total exposure 6,300  
Commercial | Energy and utilities    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 600  
Unfunded commitments 4,900  
Total exposure 5,500  
Commercial | Media and telecom    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 300  
Unfunded commitments 1,500  
Total exposure $ 1,800  
[1] Net of unearned income of $674 million at Dec. 31, 2015 and $866 million at Dec. 31, 2014 primarily on domestic and foreign lease financings.