| Document and Entity Information | May 17, 2024 |
| Document And Entity Information [Line Items] | |
| Entity Registrant Name | CITIZENS FINANCIAL GROUP INC/RI |
| Amendment Flag | false |
| Entity Central Index Key | 0000759944 |
| Current Fiscal Year End Date | --12-31 |
| Document Type | 8-K |
| Document Period End Date | May 17, 2024 |
| Entity Incorporation State 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 | (203) |
| Local Phone Number | 900-6715 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common stock, $0.01 par value per share |
| Trading Symbol | CFG |
| Security Exchange Name | NYSE |
| Depositary Shares Each Representing A 140th Interest In Ashare Of 6.350 Fixed To Floating Rate Not Cumulative Perpetual Preferred Stock Series D [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Depositary Shares, each representing a 1/40th interest in ashare of 6.350% Fixed-To-Floating Rate Non-CumulativePerpetual Preferred Stock, Series D |
| Trading Symbol | CFG PrD |
| Security Exchange Name | NYSE |
| Depositary Shares Each Representing A 140th Interest In Ashare Of 5.000 Fixed Rate Not Cumulative Perpetual Preferred Stock Series E [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Depositary Shares, each representing a 1/40th interest in ashare of 5.000% Fixed-Rate Non-CumulativePerpetual Preferred Stock, Series E |
| Trading Symbol | CFG PrE |
| Security Exchange Name | NYSE |
| Series H Preferred Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Depositary Shares, each representing a 1/40th interest in ashare of 7.375% Fixed-Rate Non-CumulativePerpetual Preferred Stock, Series H |
| Trading Symbol | CFG PrH |
| Security Exchange Name | NYSE |
