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EMPLOYEE BENEFITS - Plan Amounts Recognized in AOCI (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Sep. 01, 2014
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]      
Net prior service credit   $ 0us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax [1] $ 0us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
Net actuarial loss   606us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax [1] 414us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
Total loss recognized in accumulated other comprehensive income   606us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax [1] 414us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
AOCI loss transferred to Affiliate plans $ 35cfg_PensionandOtherPostretirementBenefitPlansAccumulatedOtherComprehensiveIncomeLossbeforeTaxDivestitures    
[1] December 31, 2014 amount excluded $35 million transferred to Affiliates on September 1, 2014.