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ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses Roll Forward (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Allowance for credit losses    
Allowance for loan losses at beginning of period $ 15,994us-gaap_LoansAndLeasesReceivableAllowance $ 19,648us-gaap_LoansAndLeasesReceivableAllowance
Gross credit losses (2,458)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs (2,983)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Gross recoveries 501us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts 544us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
NCLs 1,957us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet 2,439us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
Net reserve build (releases) (91)c_ProvisionForLoanAndLeaseLossesForReserveBuildsOrReleasesNet (560)c_ProvisionForLoanAndLeaseLossesForReserveBuildsOrReleasesNet
Net specific reserve builds (releases) (111)c_ProvisionForLoanAndLeaseLossesForSpecificReserveBuildsOrReleasesNet (86)c_ProvisionForLoanAndLeaseLossesForSpecificReserveBuildsOrReleasesNet
Total provision for credit losses 1,755us-gaap_ProvisionForLoanLossesExpensed 1,793us-gaap_ProvisionForLoanLossesExpensed
Other, net (1,194)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet (79)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
Allowance for loan losses at the end of year 14,598us-gaap_LoansAndLeasesReceivableAllowance 18,923us-gaap_LoansAndLeasesReceivableAllowance
Allowance for credit losses on unfunded lending commitments    
Allowance for credit losses on unfunded lending commitments at beginning of year 1,063c_UnfundedLendingCommitmentsAllowanceForCreditLosses 1,229c_UnfundedLendingCommitmentsAllowanceForCreditLosses
Provision (release) for unfunded lending commitments (37)c_ProvisionChargedOrReleaseForUnfundedLendingCommitmentsOtherNet (27)c_ProvisionChargedOrReleaseForUnfundedLendingCommitmentsOtherNet
Other, net (3)us-gaap_ProvisionForOtherLosses 0us-gaap_ProvisionForOtherLosses
Allowance for credit losses on unfunded lending commitments at end of year 1,023c_UnfundedLendingCommitmentsAllowanceForCreditLosses 1,202c_UnfundedLendingCommitmentsAllowanceForCreditLosses
Total allowance for loans, leases, and unfunded lending commitments at end of period $ 15,621c_LoansAndLeasesReceivableAndUnfundedLendingCommitmentsAllowance $ 20,125c_LoansAndLeasesReceivableAndUnfundedLendingCommitmentsAllowance