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Derivative Instruments- Revenue from Foreign Exchange and Other Trading (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Trading Activity, Gains and Losses, Net [Line Items]      
Foreign exchange $ 217us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ 165us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ 130us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Other trading revenue 12us-gaap_TradingGainsLosses (14)us-gaap_TradingGainsLosses 6us-gaap_TradingGainsLosses
Total foreign exchange and other trading revenue 229bk_ForeignExchangeAndOtherTradingActivities 151bk_ForeignExchangeAndOtherTradingActivities 136bk_ForeignExchangeAndOtherTradingActivities
Fixed Income      
Trading Activity, Gains and Losses, Net [Line Items]      
Other trading revenue 11us-gaap_TradingGainsLosses
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember		 (18)us-gaap_TradingGainsLosses
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember		 1us-gaap_TradingGainsLosses
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember
Credit Derivatives/Other      
Trading Activity, Gains and Losses, Net [Line Items]      
Other trading revenue $ 1us-gaap_TradingGainsLosses
/ us-gaap_TradingActivityByTypeAxis
= bk_EquityAndOtherTradingMemberDomain		 $ 4us-gaap_TradingGainsLosses
/ us-gaap_TradingActivityByTypeAxis
= bk_EquityAndOtherTradingMemberDomain		 $ 5us-gaap_TradingGainsLosses
/ us-gaap_TradingActivityByTypeAxis
= bk_EquityAndOtherTradingMemberDomain