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Fair Value Option- Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, carrying amount $ 240bk_LongTermDebtCarryingAmount  
Operations    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans Held-for-sale, Fair Value Disclosure 140us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_StatementBusinessSegmentsAxis
= bk_OperationsMember		 21us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_StatementBusinessSegmentsAxis
= bk_OperationsMember
Long-term debt, fair value 355us-gaap_LongTermDebtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= bk_OperationsMember		 347us-gaap_LongTermDebtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= bk_OperationsMember
Level 2    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans receivable, carrying amount 138us-gaap_LoansReceivableHeldForSaleAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 21us-gaap_LoansReceivableHeldForSaleAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Loans Held-for-sale, Fair Value Disclosure $ 140us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 $ 21us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member