Commitments and Contingent Liabilities- Significant Industry Concentrations Related to Credit Exposure (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans	$ 54,036,000,000	$ 51,657,000,000
Financial institutions
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans	13,576,000,000	14,359,000,000
Unfunded commitments	17,600,000,000
Total exposure	31,200,000,000
Financial institutions | Banks
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans	8,600,000,000
Unfunded commitments	2,100,000,000
Total exposure	10,700,000,000
Financial institutions | Asset managers
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans	1,100,000,000
Unfunded commitments	4,700,000,000
Total exposure	5,800,000,000
Financial institutions | Securities industry
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans	3,200,000,000
Unfunded commitments	2,500,000,000
Total exposure	5,700,000,000
Financial institutions | Insurance
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans	100,000,000
Unfunded commitments	4,200,000,000
Total exposure	4,300,000,000
Financial institutions | Government
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans	300,000,000
Unfunded commitments	3,100,000,000
Total exposure	3,400,000,000
Financial institutions | Other
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans	300,000,000
Unfunded commitments	1,000,000,000
Total exposure	1,300,000,000
Commercial
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans	1,959,000,000	1,647,000,000
Unfunded commitments	19,300,000,000
Total exposure	21,300,000,000
Commercial | Services and other
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans	800,000,000
Unfunded commitments	6,200,000,000
Total exposure	7,000,000,000
Commercial | Energy and utilities
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans	700,000,000
Unfunded commitments	5,800,000,000
Total exposure	6,500,000,000
Commercial | Manufacturing
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans	300,000,000
Unfunded commitments	5,700,000,000
Total exposure	6,000,000,000
Commercial | Media and telecom
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans	200,000,000
Unfunded commitments	1,600,000,000
Total exposure	$ 1,800,000,000