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Statement of Net Income (Unaudited) - Transco - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Revenues [Abstract]        
Revenues $ 3,053 $ 2,781 $ 6,083 $ 5,829
Costs and Expenses [Abstract]        
Operating Costs and Expenses 597 572 1,162 1,114
Depreciation, depletion, and amortization 592 605 1,176 1,190
General and Administrative Expense 180 168 373 362
Other Operating Income (Expense), Net (1) 13 (10) 3
Total costs and expenses 1,871 1,836 3,580 3,790
Operating income (loss) 1,182 945 2,503 2,039
Interest expense (371) (350) (747) (699)
Other Nonoperating Income (Expense) 32 16 58 30
Net income (loss) 1,136 757 2,292 1,679
Transcontinental Gas Pipe Line Company, LLC [Member]        
Revenues [Abstract]        
Revenues 804 791 1,651 1,561
Costs and Expenses [Abstract]        
Depreciation, depletion, and amortization 146 166 290 315
Taxes, Miscellaneous 31 31 64 61
Other Operating Income (Expense), Net 5 15 9 21
Total costs and expenses 383 408 784 792
Operating income (loss) 421 383 867 769
Interest expense (83) (81) (169) (162)
Public Utilities, Allowance for Funds Used During Construction, Additions 17 6 29 15
Other Nonoperating Income (Expense) 1 (1) 1 (2)
Net income (loss) 367 314 751 635
Transcontinental Gas Pipe Line Company, LLC [Member] | Related Party        
Costs and Expenses [Abstract]        
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization 0 3 3 5
Operating Costs and Expenses 42 39 90 84
General and Administrative Expense 47 43 95 90
Interest Income, Other 10 6 20 12
Transcontinental Gas Pipe Line Company, LLC [Member] | Nonrelated Party        
Costs and Expenses [Abstract]        
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization 27 23 51 39
Operating Costs and Expenses 76 78 162 157
General and Administrative Expense 9 10 20 20
Interest Income, Other 1 1 3 3
Transcontinental Gas Pipe Line Company, LLC [Member] | Natural Gas, US Regulated | Related Party        
Revenues [Abstract]        
Revenues 18 18 35 36
Transcontinental Gas Pipe Line Company, LLC [Member] | Natural Gas, US Regulated | Nonrelated Party        
Revenues [Abstract]        
Revenues 685 676 1,419 1,348
Transcontinental Gas Pipe Line Company, LLC [Member] | Natural Gas, Storage        
Revenues [Abstract]        
Revenues 59 63 117 118
Transcontinental Gas Pipe Line Company, LLC [Member] | Natural Gas, Gathering, Transportation, Marketing and Processing | Related Party        
Revenues [Abstract]        
Revenues 6 3 12 4
Transcontinental Gas Pipe Line Company, LLC [Member] | Natural Gas, Gathering, Transportation, Marketing and Processing | Nonrelated Party        
Revenues [Abstract]        
Revenues 21 23 42 40
Transcontinental Gas Pipe Line Company, LLC [Member] | Product and Service, Other | Related Party        
Revenues [Abstract]        
Revenues 0 1 2 2
Transcontinental Gas Pipe Line Company, LLC [Member] | Product and Service, Other | Nonrelated Party        
Revenues [Abstract]        
Revenues $ 15 $ 7 $ 24 $ 13