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Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2019
Feb. 19, 2020
Jun. 28, 2019
Document and Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 1-4174    
Entity Registrant Name Williams Companies, Inc.    
Entity Incorporation, State or Country Code DE    
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    
City Area Code 918    
Local Phone Number 573-2000    
Title of 12(b) Security Common Stock, $1.00 par value    
Trading Symbol WMB    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 32,986,794,536
Entity Common Stock, Shares Outstanding   1,212,494,859  
Documents Incorporated by Reference [Text Block]
Portions of the Registrant’s Definitive Proxy Statement for the Registrant’s Annual Meeting of Stockholders to be held on April 28, 2020, are incorporated into Part III, as specifically set forth in Part III.

   
Entity Central Index Key 0000107263    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31