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REGULATORY MATTERS - Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Dividend to parent $ 16us-gaap_DividendsCommonStockCash    
RBS      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Dividend to parent 790us-gaap_DividendsCommonStockCash
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ParentMember
1,200us-gaap_DividendsCommonStockCash
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ParentMember
150us-gaap_DividendsCommonStockCash
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ParentMember
CBNA      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Liquid assets 340us-gaap_CashCashEquivalentsAndShortTermInvestments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_MajorityOwnedSubsidiaryUnconsolidatedMember
   
Average | Subordinated Debt | CBNA      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Annual interest burden on debt $ 104us-gaap_InterestExpenseDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_MajorityOwnedSubsidiaryUnconsolidatedMember