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Fair Value Measurement- Quantitative Information about Level 3 Fair Value Measurements of Liabilities (Detail) (Fair Value, Measurements, Recurring, Level 3, USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair value of liabilities 6us-gaap_LiabilitiesFairValueDisclosure $ 9us-gaap_LiabilitiesFairValueDisclosure
Trading Liabilities | Structured Foreign Exchange Swaptions | Option Pricing Model
    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair value of liabilities 3us-gaap_LiabilitiesFairValueDisclosure
/ bk_FairValueAssetsAndLiabilitiesByMajorTypesAxis
= us-gaap_TradingLiabilitiesMember
/ bk_FairValueAssetsAndLiabilitiesComponentsAxis
= bk_StructuredForeignExchangeSwaptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_ValuationTechniqueAxis
= bk_OptionPricingModelApproachValuationTechniqueMember		 [1]  
Trading Liabilities | Structured Foreign Exchange Swaptions | Option Pricing Model | Minimum
    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Correlation risk (percent) 0.00%bk_FairValueInputsCorrelationRisk
/ bk_FairValueAssetsAndLiabilitiesByMajorTypesAxis
= us-gaap_TradingLiabilitiesMember
/ bk_FairValueAssetsAndLiabilitiesComponentsAxis
= bk_StructuredForeignExchangeSwaptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= bk_OptionPricingModelApproachValuationTechniqueMember		 [1]  
Volatility (percent) 13.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ bk_FairValueAssetsAndLiabilitiesByMajorTypesAxis
= us-gaap_TradingLiabilitiesMember
/ bk_FairValueAssetsAndLiabilitiesComponentsAxis
= bk_StructuredForeignExchangeSwaptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= bk_OptionPricingModelApproachValuationTechniqueMember		  
Trading Liabilities | Structured Foreign Exchange Swaptions | Option Pricing Model | Maximum
    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Correlation risk (percent) 25.00%bk_FairValueInputsCorrelationRisk
/ bk_FairValueAssetsAndLiabilitiesByMajorTypesAxis
= us-gaap_TradingLiabilitiesMember
/ bk_FairValueAssetsAndLiabilitiesComponentsAxis
= bk_StructuredForeignExchangeSwaptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= bk_OptionPricingModelApproachValuationTechniqueMember		 [1]  
Volatility (percent) 15.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ bk_FairValueAssetsAndLiabilitiesByMajorTypesAxis
= us-gaap_TradingLiabilitiesMember
/ bk_FairValueAssetsAndLiabilitiesComponentsAxis
= bk_StructuredForeignExchangeSwaptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= bk_OptionPricingModelApproachValuationTechniqueMember		  
Trading Liabilities | Equity Options | Option Pricing Model
    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Fair value of liabilities 3us-gaap_LiabilitiesFairValueDisclosure
/ bk_FairValueAssetsAndLiabilitiesByMajorTypesAxis
= us-gaap_TradingLiabilitiesMember
/ bk_FairValueAssetsAndLiabilitiesComponentsAxis
= us-gaap_StockOptionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_ValuationTechniqueAxis
= bk_OptionPricingModelApproachValuationTechniqueMember		 [1]  
Trading Liabilities | Equity Options | Option Pricing Model | Minimum
    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Volatility (percent) 21.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ bk_FairValueAssetsAndLiabilitiesByMajorTypesAxis
= us-gaap_TradingLiabilitiesMember
/ bk_FairValueAssetsAndLiabilitiesComponentsAxis
= us-gaap_StockOptionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= bk_OptionPricingModelApproachValuationTechniqueMember		 [1]  
Trading Liabilities | Equity Options | Option Pricing Model | Maximum
    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Volatility (percent) 22.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ bk_FairValueAssetsAndLiabilitiesByMajorTypesAxis
= us-gaap_TradingLiabilitiesMember
/ bk_FairValueAssetsAndLiabilitiesComponentsAxis
= us-gaap_StockOptionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= bk_OptionPricingModelApproachValuationTechniqueMember		 [1]  
[1] The option pricing model uses market inputs such as foreign currency exchange rates, interest rates and volatility to calculate the fair value of the option.