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Commitments and Contingent Liabilities - Significant Industry Concentrations Related to Credit Exposure (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans [1] $ 61,661 $ 63,703
Financial institutions    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 12,903 15,899
Unfunded commitments 35,500  
Total exposure 48,400  
Financial institutions | Securities industry    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 3,000  
Unfunded commitments 20,300  
Total exposure 23,300  
Financial institutions | Banks    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 7,500  
Unfunded commitments 2,000  
Total exposure 9,500  
Financial institutions | Asset managers    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 1,200  
Unfunded commitments 5,800  
Total exposure 7,000  
Financial institutions | Insurance    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 100  
Unfunded commitments 4,400  
Total exposure 4,500  
Financial institutions | Government    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 100  
Unfunded commitments 1,500  
Total exposure 1,600  
Financial institutions | Other    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 1,000  
Unfunded commitments 1,500  
Total exposure 2,500  
Commercial    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 2,331 $ 2,342
Unfunded commitments 18,300  
Total exposure 20,600  
Commercial | Manufacturing    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 500  
Unfunded commitments 5,700  
Total exposure 6,200  
Commercial | Services and other    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 800  
Unfunded commitments 6,300  
Total exposure 7,100  
Commercial | Energy and utilities    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loans 700  
Unfunded commitments 4,800  
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 $592 million at March 31, 2016 and $674 million at Dec. 31, 2015 primarily on domestic and foreign lease financings.