| Document and Entity Information Document | Jul. 28, 2021 |
| Document and Entity Information [Line Items] | |
| Entity Registrant Name | CITIZENS FINANCIAL GROUP INC/RI |
| Amendment Flag | false |
| Entity Central Index Key | 0000759944 |
| Document Type | 8-K |
| Document Period End Date | Jul. 28, 2021 |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36636 |
| Entity Tax Identification Number | 05-0412693 |
| Entity Address, Address Line One | One Citizens Plaza |
| Entity Address, City or Town | Providence |
| Entity Address, State or Province | RI |
| Entity Address, Postal Zip Code | 02903 |
| City Area Code | 401 |
| Local Phone Number | 456-7000 |
| Entity Emerging Growth Company | false |
| Written Communications | true |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Common Stock [Member] | |
| Document and Entity Information [Line Items] | |
| Title of 12(b) Security | Common stock, $0.01 par value per share |
| Trading Symbol | CFG |
| Security Exchange Name | NYSE |
| Series D Preferred Stock [Member] | |
| Document and Entity Information [Line Items] | |
| Title of 12(b) Security | Depositary Shares, each representing a 1/40th interest in a share of 6.350% Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D |
| Trading Symbol | CFG PrD |
| Security Exchange Name | NYSE |
| Series E Preferred Stock [Member] | |
| Document and Entity Information [Line Items] | |
| Title of 12(b) Security | Depositary Shares, each representing a 1/40th interest in a share of 5.000% Fixed-Rate Non-Cumulative Perpetual Preferred Stock, Series E |
| Trading Symbol | CFG PrE |
| Security Exchange Name | NYSE |
