| Document and Entity Information | Jun. 01, 2022 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001711799 |
| Document Type | 8-K |
| Document Period End Date | Jun. 1, 2022 |
| Entity Registrant Name | Nuveen Global Cities REIT, Inc. |
| Entity Incorporation State Country Code | MD |
| Entity File Number | 000-56273 |
| Entity Tax Identification Number | 82-1419222 |
| Entity Address, Address Line One | 730 Third Avenue |
| Entity Address, Address Line Two | 3rd Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10017 |
| City Area Code | (212) |
| Local Phone Number | 490-9000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
