| Document and Entity Information | Apr. 04, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Apr. 4, 2022 |
| Entity Registrant Name | Block, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-37622 |
| Entity Tax Identification Number | 80-0429876 |
| City Area Code | 415 |
| Local Phone Number | 375-3176 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Common Stock, $0.0000001 par value per share |
| Trading Symbol | SQ |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Address, Postal Zip Code | 00000 |
| Entity Central Index Key | 0001512673 |
| Amendment Flag | false |
