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Fair Value Option- Changes in Fair Value of the Loans and Long-Term Debt and the Location of the Changes (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Investment and other income | Loans Receivable      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Changes in the fair value of long-term debt $ 2us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= bk_InvestmentandOtherIncomeMember		 [1] $ 0us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= bk_InvestmentandOtherIncomeMember		 [1] $ 0us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= bk_InvestmentandOtherIncomeMember		 [1]
Foreign exchange and other trading revenue | Long-term debt      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Changes in the fair value of long-term debt $ (8)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LongTermDebtMember
/ us-gaap_IncomeStatementLocationAxis
= bk_ForeignExchangeAndOtherTradingMember		 [1] $ (10)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LongTermDebtMember
/ us-gaap_IncomeStatementLocationAxis
= bk_ForeignExchangeAndOtherTradingMember		 [1] $ (8)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LongTermDebtMember
/ us-gaap_IncomeStatementLocationAxis
= bk_ForeignExchangeAndOtherTradingMember		 [1]
[1] (a)The changes in fair value of the loans and long-term debt are approximately offset by economic hedges included in investment and other income and foreign exchange and other trading revenue.