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GOODWILL - Goodwill Rollforward (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Goodwill [Roll Forward]    
Beginning balance $ 6,876us-gaap_Goodwill $ 6,876us-gaap_Goodwill
Adjustments 0us-gaap_GoodwillOtherChanges 0us-gaap_GoodwillOtherChanges
Ending balance 6,876us-gaap_Goodwill 6,876us-gaap_Goodwill
Consumer Banking    
Goodwill [Roll Forward]    
Beginning balance 2,136us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_ConsumerBankingMember		 2,136us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_ConsumerBankingMember
Adjustments 0us-gaap_GoodwillOtherChanges
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_ConsumerBankingMember		 0us-gaap_GoodwillOtherChanges
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_ConsumerBankingMember
Ending balance 2,136us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_ConsumerBankingMember		 2,136us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_ConsumerBankingMember
Commercial Banking    
Goodwill [Roll Forward]    
Beginning balance 4,740us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_CommercialBankingMember		 4,740us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_CommercialBankingMember
Adjustments 0us-gaap_GoodwillOtherChanges
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_CommercialBankingMember		 0us-gaap_GoodwillOtherChanges
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_CommercialBankingMember
Ending balance $ 4,740us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_CommercialBankingMember		 $ 4,740us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_CommercialBankingMember