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Federal Funds Sold and Securities Borrowed or Purchased Under Agreements to Resell Securities Sold Under Agreements to Repurchase (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase $ 1,845us-gaap_SecuritiesSoldUnderAgreementsToRepurchase [1] $ 2,276us-gaap_SecuritiesSoldUnderAgreementsToRepurchase [1]
US Treasury Securities [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase   376us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
US Government Agencies Debt Securities [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase   231us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase   1,104us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Commercial Paper [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase   238us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialPaperMember
Corporate Debt Securities [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase   327us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Maturity Overnight [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase 1,845us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityOvernightMember		 2,231us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityOvernightMember
Maturity Overnight [Member] | US Treasury Securities [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase 167us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityOvernightMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 376us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityOvernightMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Maturity Overnight [Member] | US Government Agencies Debt Securities [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase 101us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityOvernightMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 231us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityOvernightMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Maturity Overnight [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase 1,105us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityOvernightMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 1,059us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityOvernightMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Maturity Overnight [Member] | Commercial Paper [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase 101us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityOvernightMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialPaperMember		 238us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityOvernightMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialPaperMember
Maturity Overnight [Member] | Corporate Debt Securities [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase 371us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityOvernightMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 327us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityOvernightMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Maturity up to 30 days [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase   45us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityUpTo30DaysMember
Maturity up to 30 days [Member] | US Treasury Securities [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase   0us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityUpTo30DaysMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Maturity up to 30 days [Member] | US Government Agencies Debt Securities [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase   0us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityUpTo30DaysMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Maturity up to 30 days [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase   45us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityUpTo30DaysMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Maturity up to 30 days [Member] | Commercial Paper [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase   0us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityUpTo30DaysMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialPaperMember
Maturity up to 30 days [Member] | Corporate Debt Securities [Member]    
securities sold under agreement to repurchase maturity [Line Items]    
Securities Sold under Agreements to Repurchase   $ 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityUpTo30DaysMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
[1] None of the Company's repurchase or resell transactions met the right of setoff criteria for net balance sheet presentation at March 31, 2015 and December 31, 2014.