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Statement of Net Income (Unaudited) - Transco - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues [Abstract]        
Revenues $ 2,923 $ 2,653 $ 8,752 $ 7,760
Costs and Expenses [Abstract]        
Depreciation, depletion, and amortization 564 566 1,754 1,654
Other Operating Income (Expense), Net 14 (25) 17 (69)
Total costs and expenses 1,814 1,815 5,604 5,214
Operating income (loss) 1,109 838 3,148 2,546
Interest expense (372) (338) (1,071) (1,026)
Other Nonoperating Income (Expense) 21 31 51 95
Net income (loss) attributable to The Williams Companies, Inc. 647 706 1,884 1,739
Transcontinental Gas Pipe Line Company, LLC [Member]        
Revenues [Abstract]        
Revenues 844 746 2,405 2,188
Costs and Expenses [Abstract]        
Cost of natural gas sales 37 26 81 72
Utilities Operating Expense, Maintenance and Operations 131 138 372 376
General and Administrative Expense 56 56 166 159
Depreciation, depletion, and amortization 111 145 426 410
Taxes, Miscellaneous 30 28 91 85
Other Operating Income (Expense), Net 4 (13) 25 (38)
Total costs and expenses 369 380 1,161 1,064
Operating income (loss) 475 366 1,244 1,124
Interest expense (82) (82) (244) (243)
Interest Income, Other 8 14 23 47
Public Utilities, Allowance for Funds Used During Construction, Additions 10 23 25 73
Other Nonoperating Income (Expense) (1) (2) (3) (5)
Net income (loss) attributable to The Williams Companies, Inc. 410 319 1,045 996
Natural Gas, US Regulated | Transcontinental Gas Pipe Line Company, LLC [Member]        
Revenues [Abstract]        
Revenues 750 663 2,134 1,949
Natural Gas, Storage | Transcontinental Gas Pipe Line Company, LLC [Member]        
Revenues [Abstract]        
Revenues 51 52 169 148
Natural Gas, Gathering, Transportation, Marketing and Processing | Transcontinental Gas Pipe Line Company, LLC [Member]        
Revenues [Abstract]        
Revenues 37 26 81 72
Product and Service, Other | Transcontinental Gas Pipe Line Company, LLC [Member]        
Revenues [Abstract]        
Revenues $ 6 $ 5 $ 21 $ 19