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Acquisitions (Details) - USD ($)
$ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended 11 Months Ended 12 Months Ended
Nov. 01, 2024
Aug. 01, 2024
Jan. 03, 2024
Nov. 30, 2023
Feb. 14, 2023
Dec. 31, 2023
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Business Acquisition [Line Items]                              
Payments to Acquire Businesses, Net of Cash Acquired                   $ 1,995   $ 1,024      
Revenues               $ 2,653 $ 2,559 7,760   8,123      
Modified EBITDA Earnings Loss               1,679 1,774 5,044   5,571      
Gain on remeasurement of equity-method investment (Note 2)                   127   0      
Net income (loss) attributable to The Williams Companies, Inc.               706 654 1,739   2,041      
Pro Forma [Member]                              
Business Acquisition [Line Items]                              
Business Acquisition, Pro Forma Revenue               2,662 2,719 7,818   8,618      
Business Acquisition, Pro Forma Net Income (Loss)               705 672 1,734   2,107      
Operating Segments [Member]                              
Business Acquisition [Line Items]                              
Modified EBITDA Earnings Loss               1,621 1,693 4,863   5,375      
Transmission And Gulf Of Mexico [Member] | Operating Segments [Member]                              
Business Acquisition [Line Items]                              
Revenues               1,170 1,053 3,357   3,102      
Modified EBITDA Earnings Loss               811 881 2,448   2,327      
West [Member] | Operating Segments [Member]                              
Business Acquisition [Line Items]                              
Revenues               663 533 1,985   1,536      
Modified EBITDA Earnings Loss               323 315 968   931      
Discovery Acquisition                              
Business Acquisition [Line Items]                              
Business Combination, Consideration Transferred   $ 170                          
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value   381                          
Gain on remeasurement of equity-method investment (Note 2)   127                          
Discovery Acquisition | Pro Forma [Member]                              
Business Acquisition [Line Items]                              
Business Acquisition, Pro Forma Revenue               9 [1] 31 58 [1]   96      
Business Acquisition, Pro Forma Net Income (Loss)               $ (1) [1] 1 (5) [1]   0      
Discovery Acquisition | Transmission And Gulf Of Mexico [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   22                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other   19                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   941                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets   39                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   1,021                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other   (40)                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other   (296)                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   (336)                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   $ 685                          
Discovery Acquisition | Transmission And Gulf Of Mexico [Member] | Discovery Producer Services LLC [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage           60.00%             60.00% 60.00%  
Business Acquisition, Percentage of Voting Interests Acquired   40.00%                          
Discovery Acquisition | Transmission And Gulf Of Mexico [Member] | Operating Segments [Member]                              
Business Acquisition [Line Items]                              
Revenues             $ 46                
Modified EBITDA Earnings Loss             $ 10                
Gulf Coast Storage Acquisition                              
Business Acquisition [Line Items]                              
Business Acquisition, Percentage of Voting Interests Acquired     100.00%                        
Business Combination, Consideration Transferred     $ 1,950                        
Business Combination, Consideration Transferred, Liabilities Incurred     100                        
Gulf Coast Storage Acquisition | Pro Forma [Member]                              
Business Acquisition [Line Items]                              
Business Acquisition, Pro Forma Revenue                 51     145      
Business Acquisition, Pro Forma Net Income (Loss)                 12     47      
Gulf Coast Storage Acquisition | Transmission And Gulf Of Mexico [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents     46                        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other     18                        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment     2,035                        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets     2                        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     2,101                        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other     (11)                        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other     (107)                        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     (118)                        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net     $ 1,983                        
Gulf Coast Storage Acquisition | Transmission And Gulf Of Mexico [Member] | Operating Segments [Member]                              
Business Acquisition [Line Items]                              
Revenues                     $ 171        
Modified EBITDA Earnings Loss                     $ 123        
Gulf Coast Storage Acquisition | Transmission And Gulf Of Mexico [Member] | Operating Segments [Member] | Selling, general and administrative expenses [Member]                              
Business Acquisition [Line Items]                              
Business Combination Acquisition Related Costs Cumulative                   14          
Business Combination, Acquisition Related Costs                   13          
Cureton Acquisition                              
Business Acquisition [Line Items]                              
Business Acquisition, Percentage of Voting Interests Acquired       100.00%                      
Business Combination, Consideration Transferred       $ 546                      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life       20 years                      
Percentage Of Finite Lived Intangible Assets Impacted By Our Intent Or Ability To Renew Or Extend Arrangement       24.00%                      
Acquired Finite-lived Intangible Asset, Weighted-Average Period before Renewal or Extension       10 years                      
Cureton Acquisition | West [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents       $ 6                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other       21                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment       435                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       117                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets       1                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets       580                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other       (29)                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other       (14)                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities       (43)                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net       537                      
Goodwill       9                      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net       546                      
Cureton Acquisition | West [Member] | Operating Segments [Member]                              
Business Acquisition [Line Items]                              
Revenues           $ 35                  
Modified EBITDA Earnings Loss           7                  
Cureton Acquisition | West [Member] | Operating Segments [Member] | Selling, general and administrative expenses [Member]                              
Business Acquisition [Line Items]                              
Business Combination Acquisition Related Costs Cumulative                   7          
Business Combination, Acquisition Related Costs                   1          
RMM Acquisition                              
Business Acquisition [Line Items]                              
Business Combination, Consideration Transferred       704                      
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value       406                      
Gain on remeasurement of equity-method investment (Note 2)       $ 30                      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life       20 years                      
Percentage Of Finite Lived Intangible Assets Impacted By Our Intent Or Ability To Renew Or Extend Arrangement       18.00%                      
Acquired Finite-lived Intangible Asset, Weighted-Average Period before Renewal or Extension       10 years                      
RMM Acquisition | Subsequent Event [Member]                              
Business Acquisition [Line Items]                              
Extinguishment of Debt, Amount $ 651                            
RMM Acquisition | West [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents       $ 28                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other       4                      
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Investments       20                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment       1,041                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       63                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets       12                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets       1,168                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other       (44)                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other       (103)                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities       (147)                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net       1,021                      
Goodwill       55                      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net       1,076                      
Business Acquisition, Goodwill, Expected Tax Deductible Amount       $ 55                      
RMM Acquisition | West [Member] | Rocky Mountain Midstream Holdings LLC [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage                             50.00%
Business Acquisition, Percentage of Voting Interests Acquired       50.00%                      
RMM Acquisition | West [Member] | Operating Segments [Member]                              
Business Acquisition [Line Items]                              
Revenues           53                  
Modified EBITDA Earnings Loss           $ 12                  
DJ Basin Acquisitions | Pro Forma [Member]                              
Business Acquisition [Line Items]                              
Business Acquisition, Pro Forma Revenue                 78     219      
Business Acquisition, Pro Forma Net Income (Loss)                 $ 5     13      
MountainWest Acquisition                              
Business Acquisition [Line Items]                              
Business Acquisition, Percentage of Voting Interests Acquired         100.00%                    
Business Combination, Consideration Transferred         $ 1,080                    
Business Combination, Consideration Transferred, Liabilities Incurred         430                    
Payments to Acquire Businesses, Net of Cash Acquired                           $ 1,024  
MountainWest Acquisition | Pro Forma [Member]                              
Business Acquisition [Line Items]                              
Business Acquisition, Pro Forma Revenue [1]                       35      
Business Acquisition, Pro Forma Net Income (Loss) [1]                       6      
MountainWest Acquisition | Transmission And Gulf Of Mexico [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents         23                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables         33                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other         26                    
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Investments         20                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment         1,019                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets         33                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets         1,154                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other         (47)                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt         (365)                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other         (95)                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities         (507)                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net         647                    
Goodwill         400                    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net         1,047                    
Business Acquisition, Goodwill, Expected Tax Deductible Amount         $ 400                    
MountainWest Acquisition | Transmission And Gulf Of Mexico [Member] | Operating Segments [Member]                              
Business Acquisition [Line Items]                              
Revenues                         $ 225    
Modified EBITDA Earnings Loss                         122    
Business Combination, Transition Related Costs                         $ 27    
MountainWest Acquisition | Transmission And Gulf Of Mexico [Member] | Operating Segments [Member] | Selling, general and administrative expenses [Member]                              
Business Acquisition [Line Items]                              
Business Combination Acquisition Related Costs Cumulative                   $ 17          
Business Combination, Acquisition Related Costs                       $ 15      
[1] Excludes results from operations acquired in the acquisition for the period beginning on the acquisition date, as these results are included in the amounts as reported.