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BUSINESS COMBINATIONS (Gain in Change in Control) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jan. 28, 2014
Business Acquisition [Line Items]      
Gain attributable to SCUSA shares sold $ 137,536us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount $ 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount  
SCUSA [Member]      
Business Acquisition [Line Items]      
Gain attributable to SCUSA shares sold     137,536us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember
Gain attributable to the remaining equity interest     2,291,003sov_BusinessCombinationGainRecognizedAmountAttributabletoAcquireeSharesSold
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember
Total pre-tax gain     $ 2,428,539us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember
Number of shares issued     13,895,243us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember