Commitments and Contingent Liabilities- Summary of Off-Balance Sheet Credit Risks, Net of Participations (Detail) (USD $)	Mar. 31, 2014		Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Securities Lending Indemnifications Joint Venture	$ 65,000,000,000		$ 60,000,000,000
Lending commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Credit Risk	34,842,000,000	[1]	34,039,000,000	[1]
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Credit Risk	6,932,000,000	[2]	6,721,000,000	[2]
Commercial letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Credit Risk	280,000,000		310,000,000
Securities lending indemnifications
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Credit Risk	$ 276,106,000,000	[3]	$ 244,382,000,000	[3]

[1] Net of participations totaling $6 million at March 31, 2014 and $6 million at Dec. 31, 2013.

[2] Net of participations totaling $688 million at March 31, 2014 and $720 million at Dec. 31, 2013.

[3] Excludes the indemnification for securities for which BNY Mellon acts as an agent on behalf of CIBC Mellon clients, which totaled $65 billion at March 31, 2014 and $60 billion at