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Loans and asset quality- Nonperforming Assets (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Nonperforming loans $ 124us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 125us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Other assets owned 4bk_OtherNonperformingAssets 3bk_OtherNonperformingAssets
Total nonperforming assets 128bk_LoansLeasesAndOtherAssetsReceivableNetReportedAmountNonperformingAssets [1] 128bk_LoansLeasesAndOtherAssetsReceivableNetReportedAmountNonperformingAssets [1]
Loans fair value 73us-gaap_LoansReceivableFairValueDisclosure 53us-gaap_LoansReceivableFairValueDisclosure
Domestic | Other residential mortgages    
Financing Receivable, Impaired [Line Items]    
Nonperforming loans 111us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember		 112us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember
Domestic | Wealth management loans and mortgages    
Financing Receivable, Impaired [Line Items]    
Nonperforming loans 12us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_WealthManagementLoansAndMortgagesPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember		 12us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_WealthManagementLoansAndMortgagesPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember
Domestic | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Nonperforming loans $ 1us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember		 $ 1us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember
[1] Loans of consolidated investment management funds are not part of BNY Mellon’s loan portfolio. Included in the loans of consolidated investment management funds are nonperforming loans of $73 million at March 31, 2015 and $53 million at Dec. 31, 2014. These loans are recorded at fair value and therefore do not impact the provision for credit losses and allowance for loan losses, and accordingly are excluded from the nonperforming assets table above.