| Document and Entity Information | Feb. 22, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 22, 2021 |
| Entity Registrant Name | Williams Companies, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-4174 |
| Entity Tax Identification Number | 73-0569878 |
| Entity Address, Address Line One | One Williams Center |
| Entity Address, City or Town | Tulsa |
| Entity Address, State or Province | OK |
| Entity Address, Postal Zip Code | 74172-0172 |
| City Area Code | 918 |
| Local Phone Number | 573-2000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $1.00 par value |
| Trading Symbol | WMB |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000107263 |
| Amendment Flag | false |
