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Derivatives and Hedging Activities (Details 1) (Fair Value Hedging [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Other Expense [Member] | Interest Rate Contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative contract | $ (143)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember | $ (370)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember | $ (178)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember
Hedged item | 148 us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember | 351 us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember | 132 us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember
Net hedge ineffectiveness | 5 us-gaap_GainLossOnFairValueHedgeIneffectivenessNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember | (19)us-gaap_GainLossOnFairValueHedgeIneffectivenessNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember | (46)us-gaap_GainLossOnFairValueHedgeIneffectivenessNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember
Other Revenues [Member] | Total Return Swap [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative contract | 11 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TotalReturnSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | 15 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TotalReturnSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | (53)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TotalReturnSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember
Hedged item | (11)us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TotalReturnSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | (15)us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TotalReturnSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | 54 us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TotalReturnSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember
Net hedge ineffectiveness | $ 0 us-gaap_GainLossOnFairValueHedgeIneffectivenessNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TotalReturnSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | $ 0 us-gaap_GainLossOnFairValueHedgeIneffectivenessNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TotalReturnSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | $ 1 us-gaap_GainLossOnFairValueHedgeIneffectivenessNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TotalReturnSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember

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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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