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BUSINESS COMBINATIONS (Finite-Lived and Indefinite-Lived Intangible Assets Acquired) (Details) (SCUSA [Member], USD $)
In Thousands, unless otherwise specified
9 Months Ended 0 Months Ended
Sep. 30, 2014
Jan. 28, 2014
Business Acquisition [Line Items]    
Intangibles subject to amortization, Net Carrying Amount $ 478,800us-gaap_FinitelivedIntangibleAssetsAcquired1  
Total Intangibles   768,750us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Trade name [Member]
   
Business Acquisition [Line Items]    
Intangibles not subject to amortization, Net Carrying Amount   50,000us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Dealer networks [Member]
   
Business Acquisition [Line Items]    
Intangibles subject to amortization, Net Carrying Amount   580,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sov_DealerNetworkMember
Intangibles subject to amortization, Weighted Average Amortization Period   17 years 6 months [1]
Dealer networks [Member] | Minimum [Member]
   
Business Acquisition [Line Items]    
Intangibles subject to amortization, Weighted Average Amortization Period   7 years
Dealer networks [Member] | Maximum [Member]
   
Business Acquisition [Line Items]    
Intangibles subject to amortization, Weighted Average Amortization Period   20 years
Chrysler relationship [Member]
   
Business Acquisition [Line Items]    
Intangibles subject to amortization, Net Carrying Amount   $ 138,750us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sov_ChryslerRelationshipMember
Intangibles subject to amortization, Weighted Average Amortization Period   9 years 2 months 12 days
[1] The amortization periods of the dealer network range between 7 and 20 years.