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Fair Value Measurement- Quantitative Information about Level 3 Fair Value Measurements of Assets (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Measurements, Recurring | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value of assets $ 71us-gaap_AssetsFairValueDisclosure
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Fair Value, Measurements, Nonrecurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value of assets 117us-gaap_AssetsFairValueDisclosure
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Fair Value, Measurements, Nonrecurring | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value of assets 2us-gaap_AssetsFairValueDisclosure
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Securities available-for-sale | Fair Value, Measurements, Recurring | Level 3 | State and political subdivisions | Discounted Cash Flow    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value of assets 11us-gaap_AssetsFairValueDisclosure
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Fair value inputs, expected credit loss (percent) 1.00%bk_FairValueInputsExpectedCreditLoss
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Trading Securities | Fair Value, Measurements, Recurring | Level 3 | Structured Foreign Exchange Swaptions | Option Pricing Model | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Correlation risk (percent) 0.00%bk_FairValueInputsCorrelationRisk
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Volatility (percent) 13.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
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Trading Securities | Fair Value, Measurements, Recurring | Level 3 | Structured Foreign Exchange Swaptions | Option Pricing Model | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Correlation risk (percent) 25.00%bk_FairValueInputsCorrelationRisk
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Volatility (percent) 15.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
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Trading Securities | Fair Value, Measurements, Recurring | Level 3 | Long-Term Foreign Exchange Options | Option Pricing Model    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value of assets 3us-gaap_AssetsFairValueDisclosure
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Trading Securities | Fair Value, Measurements, Recurring | Level 3 | Equity Options | Option Pricing Model    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value of assets 3us-gaap_AssetsFairValueDisclosure
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Trading Securities | Fair Value, Measurements, Recurring | Level 3 | Equity Options | Option Pricing Model | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Volatility (percent) 21.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
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Trading Securities | Fair Value, Measurements, Recurring | Level 3 | Equity Options | Option Pricing Model | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Volatility (percent) 22.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
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Loans Receivable | Fair Value, Measurements, Nonrecurring | Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cap rate (percent) 8.00%us-gaap_FairValueInputsCapRate
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Loans Receivable | Fair Value, Measurements, Nonrecurring | Level 3 | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Timing of sale (months) 0 months  
Loans Receivable | Fair Value, Measurements, Nonrecurring | Level 3 | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Timing of sale (months) 15 months  
Loans Receivable | Fair Value, Measurements, Nonrecurring | Level 3 | Discounted Cash Flow    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value of assets $ 2us-gaap_AssetsFairValueDisclosure
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Loans Receivable | Fair Value, Measurements, Nonrecurring | Level 3 | Discounted Cash Flow | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost to complete/sell (percent) 0.00%bk_FairValueInputsCostsToCompleteSale
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Loans Receivable | Fair Value, Measurements, Nonrecurring | Level 3 | Discounted Cash Flow | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost to complete/sell (percent) 260.00%bk_FairValueInputsCostsToCompleteSale
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[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.