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Divestitures (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2018
Oct. 01, 2018
Oct. 26, 2017
Jul. 06, 2017
Income (Loss) from Individually Significant Component Disposed of, Attributable to Parent, before Income Tax [Abstract]                            
Gain on sale of certain assets               $ (2) $ 692 $ 1,095        
Impairment Of Certain Assets [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | West [Member]                            
Income (Loss) from Individually Significant Component Disposed of, Attributable to Parent, before Income Tax [Abstract]                            
Tangible Asset Impairment Charges $ 20                          
Impairment Of Certain Assets [Member] | Fair Value, Nonrecurring [Member] | Level 3 [Member]                            
Income (Loss) from Individually Significant Component Disposed of, Attributable to Parent, before Income Tax [Abstract]                            
Tangible Asset Impairment Charges               $ 19 0 23        
Impairment Of Certain Assets [Member] | Fair Value, Nonrecurring [Member] | Level 3 [Member] | Transmission And Gulf Of Mexico [Member]                            
Income (Loss) from Individually Significant Component Disposed of, Attributable to Parent, before Income Tax [Abstract]                            
Tangible Asset Impairment Charges $ 354                          
Impairment Of Certain Assets [Member] | Fair Value, Nonrecurring [Member] | Level 3 [Member] | West [Member]                            
Income (Loss) from Individually Significant Component Disposed of, Attributable to Parent, before Income Tax [Abstract]                            
Tangible Asset Impairment Charges   $ 59 $ 12                      
Gulf Coast Pipeline Systems [Member]                            
Income Statement and Additional Disclosures by Disposal Groups [Line Items]                            
Disposal Group, Consideration                     $ 177      
Income (Loss) from Individually Significant Component Disposed of, Attributable to Parent, before Income Tax [Abstract]                            
Gain on sale of certain assets       $ 101                    
Gulf Coast Pipeline Systems [Member] | Transmission And Gulf Of Mexico [Member]                            
Income (Loss) from Individually Significant Component Disposed of, Attributable to Parent, before Income Tax [Abstract]                            
Gain on sale of certain assets       81                    
Gulf Coast Pipeline Systems [Member] | Other [Member]                            
Income (Loss) from Individually Significant Component Disposed of, Attributable to Parent, before Income Tax [Abstract]                            
Gain on sale of certain assets       20                    
Gulf Coast Pipeline Systems [Member] | Disposal Group, Not Discontinued Operations [Member] | Impairment Of Certain Assets [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]                            
Income (Loss) from Individually Significant Component Disposed of, Attributable to Parent, before Income Tax [Abstract]                            
Tangible Asset Impairment Charges         $ 66                  
Gulf Coast Pipeline Systems [Member] | Disposal Group, Not Discontinued Operations [Member] | Impairment Of Certain Assets [Member] | Fair Value, Nonrecurring [Member] | Level 3 [Member]                            
Income (Loss) from Individually Significant Component Disposed of, Attributable to Parent, before Income Tax [Abstract]                            
Tangible Asset Impairment Charges           $ 68 $ 23              
Four Corners [Member] | West [Member]                            
Income Statement and Additional Disclosures by Disposal Groups [Line Items]                            
Disposal Group, Consideration                       $ 1,125    
Income (Loss) from Individually Significant Component Disposed of, Attributable to Parent, before Income Tax [Abstract]                            
Income (Loss) before Income Taxes of Disposal Group                 52 47        
Income (Loss) before Income Taxes of Disposal Group Attributable to the Williams Companies, Inc.                 $ 43 35        
Gain on sale of certain assets       $ 591                    
Williams Olefins, LLC [Member]                            
Income Statement and Additional Disclosures by Disposal Groups [Line Items]                            
Disposal Group, Consideration                         $ 12 $ 2,084
Income (Loss) from Individually Significant Component Disposed of, Attributable to Parent, before Income Tax [Abstract]                            
Gain (Loss) on Disposition of Business           $ 1,095                
Williams Olefins, LLC [Member] | Disposal Group, Not Discontinued Operations [Member]                            
Income (Loss) from Individually Significant Component Disposed of, Attributable to Parent, before Income Tax [Abstract]                            
Income (Loss) before Income Taxes of Disposal Group                   26        
Income (Loss) before Income Taxes of Disposal Group Attributable to the Williams Companies, Inc.                   $ 19