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BUSINESS COMBINATIONS (Fair Value of Loans Acquired) (Details) (SCUSA [Member], USD $)
In Thousands, unless otherwise specified
Jan. 28, 2014
SCUSA [Member]
  
Business Acquisition [Line Items]  
Fair value of loan receivables $ 19,870,790us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember		 [1]
Gross contractual amount of loan receivables 31,410,699us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember		 [1]
Estimate of contractual cash flows not expected to be collected at acquisition $ 4,301,586sov_CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesAcquiredDuringPeriodInterestComponent
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember		 [1]
[1] Fair value of receivables does not include amounts related to the loan receivables - unsecured and loan receivables from dealers due to the short-term and revolving nature of the receivables.