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Loans and asset quality- Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
class_of_receivable
Segment
Dec. 31, 2014
Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of portfolio segments 3bk_NumberofPortfolioSegments    
Number of classes of financing receivables 6bk_NumberofClassesofFinancingReceivable    
Loans $ 62,326us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome [1] $ 59,132us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome [1]  
Number of business days in which overdrafts are generally repaid 2 days    
Other residential mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Subsequently defaulted number of contracts (contracts) 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		    
Loans 1,181us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 1,222us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		  
Wealth management mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan to value ratio at origination (percent) 60.00%bk_LoanToValueRatio
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_WealthManagementMortgagesPortfolioSegmentMember		    
Percentage of past due mortgages (percent) 1.00%bk_PercentageOfLoansThirtyDaysOrMorePastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_WealthManagementMortgagesPortfolioSegmentMember		    
Loans 5,713us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_WealthManagementMortgagesPortfolioSegmentMember		 5,534us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_WealthManagementMortgagesPortfolioSegmentMember		  
Wealth management mortgages | California State      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Geographic concentrations (percent) 21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_WealthManagementMortgagesPortfolioSegmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA		    
Wealth management mortgages | New York State      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Geographic concentrations (percent) 20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_WealthManagementMortgagesPortfolioSegmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_NY		    
Wealth management mortgages | Massachusetts      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Geographic concentrations (percent) 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_WealthManagementMortgagesPortfolioSegmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_MA		    
Wealth management mortgages | Florida      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Geographic concentrations (percent) 8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_WealthManagementMortgagesPortfolioSegmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL		    
Wealth management mortgages | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Geographic concentrations (percent) 36.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_WealthManagementMortgagesPortfolioSegmentMember
/ us-gaap_StatementGeographicalAxis
= bk_OtherStateMember		    
Overdrafts      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 6,993us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_BankOverdraftsMember		 5,882us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_BankOverdraftsMember		  
Number of business days in which overdrafts are generally repaid 2 days    
Margin loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 19,566us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_MarginLoanMember		 20,034us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_MarginLoanMember		  
Domestic      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 46,376us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember		 45,611us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember		  
Domestic | Other residential mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,181us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember		 1,222us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember		  
Purchased mortgages 337bk_PurchasedMortgages
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember		    
Purchased residential mortgages, loan to value ratio (percent) 76.00%bk_LoanToValueRatioPurchasedResidentialMortgages
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember		    
Percentage of purchased residential mortgages that were at least 60 days delinquent (percent) 18.00%bk_PercentageOfLoansSixtyOrMoreDaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember		    
Domestic | Overdrafts      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,513us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_BankOverdraftsMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember		 1,348us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_BankOverdraftsMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember		 1,078us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_BankOverdraftsMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember
Domestic | Margin loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 19,459us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_MarginLoanMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember		 $ 20,034us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_MarginLoanMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember		 $ 16,430us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_MarginLoanMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember
Domestic | Margin loans | Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Required daily collateral margin (percent) 100.00%bk_PercentageCollateralToLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bk_MarginLoanMember
/ us-gaap_ProductOrServiceAxis
= bk_DomesticMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
[1] Net of unearned income of $843 million at March 31, 2015 and $866 million at Dec. 31, 2014 primarily on domestic and foreign lease financings.