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Segment Disclosures Recon from Segment to Consolidated - Revenues, Modified EBITDA, and Significant Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment revenues [Line Items]    
Revenues $ 3,048 $ 2,771
Other financial information:    
Proportional Modified EBITDA Equity Method Investments (236) (228)
Modified EBITDA 1,953 1,837
Depreciation, Depletion and Amortization (585) (548)
Income (Loss) from Equity Method Investments 155 137
Other investing income (loss) - net 8 24
Interest expense (349) (349)
Asset Retirement Obligation Accretion Expense For Nonregulated Operations (24) (18)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 922 855
Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales    
Other financial information:    
Unrealized Gain (Loss) on Derivatives (10) 3
Service [Member]    
Segment revenues [Line Items]    
Revenues 2,003 1,905
NonRegulated Service Commodity Consideration [Member]    
Segment revenues [Line Items]    
Revenues 49 30
Product [Member]    
Segment revenues [Line Items]    
Revenues 1,058 845
Energy Commodities and Service    
Segment revenues [Line Items]    
Revenues (62) (9)
Operating Segments [Member] | Transmission And Gulf Of America [Member]    
Segment revenues [Line Items]    
Revenues 1,272 1,119
Other financial information:    
Product Costs And Net Realized Processing Commodity Expenses (123) (61)
Operating And Administrative Expenses [1] (270) (255)
Recovery of Direct Costs [2] (70) (64)
Other Segment Income (Expenses) - Net [3] 13 44
Proportional Modified EBITDA Equity Method Investments 36 46
Modified EBITDA 858 829
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales    
Other financial information:    
Unrealized Gain (Loss) on Derivatives 0 0
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Service [Member]    
Segment revenues [Line Items]    
Revenues 1,135 1,049
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Service [Member] | External Customer    
Segment revenues [Line Items]    
Revenues 1,113 1,029
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Service [Member] | Internal Customer    
Segment revenues [Line Items]    
Revenues 22 20
Operating Segments [Member] | Transmission And Gulf Of America [Member] | NonRegulated Service Commodity Consideration [Member]    
Segment revenues [Line Items]    
Revenues 23 9
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Product [Member]    
Segment revenues [Line Items]    
Revenues 115 61
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Product [Member] | External Customer    
Segment revenues [Line Items]    
Revenues 26 30
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Product [Member] | Internal Customer    
Segment revenues [Line Items]    
Revenues 89 31
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Energy Commodities and Service    
Segment revenues [Line Items]    
Revenues [4] (1) 0
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Energy Commodities and Service | Realized Gain (Loss)    
Segment revenues [Line Items]    
Revenues (1) 0
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Energy Commodities and Service | Unrealized Gain (Loss)    
Segment revenues [Line Items]    
Revenues 0 0
Operating Segments [Member] | Northeast G And P [Member]    
Segment revenues [Line Items]    
Revenues 555 509
Other financial information:    
Product Costs And Net Realized Processing Commodity Expenses (52) (19)
Operating And Administrative Expenses [1] (106) (108)
Recovery of Direct Costs [2] (42) (34)
Other Segment Income (Expenses) - Net [3] 0 (1)
Proportional Modified EBITDA Equity Method Investments 159 157
Modified EBITDA 514 504
Operating Segments [Member] | Northeast G And P [Member] | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales    
Other financial information:    
Unrealized Gain (Loss) on Derivatives 0 0
Operating Segments [Member] | Northeast G And P [Member] | Service [Member]    
Segment revenues [Line Items]    
Revenues 497 479
Operating Segments [Member] | Northeast G And P [Member] | Service [Member] | External Customer    
Segment revenues [Line Items]    
Revenues 493 475
Operating Segments [Member] | Northeast G And P [Member] | Service [Member] | Internal Customer    
Segment revenues [Line Items]    
Revenues 4 4
Operating Segments [Member] | Northeast G And P [Member] | NonRegulated Service Commodity Consideration [Member]    
Segment revenues [Line Items]    
Revenues 1 5
Operating Segments [Member] | Northeast G And P [Member] | Product [Member]    
Segment revenues [Line Items]    
Revenues 57 25
Operating Segments [Member] | Northeast G And P [Member] | Product [Member] | External Customer    
Segment revenues [Line Items]    
Revenues 18 2
Operating Segments [Member] | Northeast G And P [Member] | Product [Member] | Internal Customer    
Segment revenues [Line Items]    
Revenues 39 23
Operating Segments [Member] | Northeast G And P [Member] | Energy Commodities and Service    
Segment revenues [Line Items]    
Revenues [4] 0 0
Operating Segments [Member] | Northeast G And P [Member] | Energy Commodities and Service | Realized Gain (Loss)    
Segment revenues [Line Items]    
Revenues 0 0
Operating Segments [Member] | Northeast G And P [Member] | Energy Commodities and Service | Unrealized Gain (Loss)    
Segment revenues [Line Items]    
Revenues 0 0
Operating Segments [Member] | West [Member]    
Segment revenues [Line Items]    
Revenues 725 701
Other financial information:    
Product Costs And Net Realized Processing Commodity Expenses (254) (249)
Operating And Administrative Expenses [1] (152) (139)
Recovery of Direct Costs [2] (14) (11)
Other Segment Income (Expenses) - Net [3] 11 0
Proportional Modified EBITDA Equity Method Investments 38 25
Modified EBITDA 354 327
Operating Segments [Member] | West [Member] | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales    
Other financial information:    
Unrealized Gain (Loss) on Derivatives 0 0
Operating Segments [Member] | West [Member] | Service [Member]    
Segment revenues [Line Items]    
Revenues 438 437
Operating Segments [Member] | West [Member] | Service [Member] | External Customer    
Segment revenues [Line Items]    
Revenues 393 397
Operating Segments [Member] | West [Member] | Service [Member] | Internal Customer    
Segment revenues [Line Items]    
Revenues 45 40
Operating Segments [Member] | West [Member] | NonRegulated Service Commodity Consideration [Member]    
Segment revenues [Line Items]    
Revenues 25 16
Operating Segments [Member] | West [Member] | Product [Member]    
Segment revenues [Line Items]    
Revenues 264 248
Operating Segments [Member] | West [Member] | Product [Member] | External Customer    
Segment revenues [Line Items]    
Revenues 40 72
Operating Segments [Member] | West [Member] | Product [Member] | Internal Customer    
Segment revenues [Line Items]    
Revenues 224 176
Operating Segments [Member] | West [Member] | Energy Commodities and Service    
Segment revenues [Line Items]    
Revenues [4] (2) 0
Operating Segments [Member] | West [Member] | Energy Commodities and Service | Realized Gain (Loss)    
Segment revenues [Line Items]    
Revenues (2) 0
Operating Segments [Member] | West [Member] | Energy Commodities and Service | Unrealized Gain (Loss)    
Segment revenues [Line Items]    
Revenues 0 0
Operating Segments [Member] | Gas & NGL Marketing Services    
Segment revenues [Line Items]    
Revenues [5] 711 570
Other financial information:    
Product Costs And Net Realized Processing Commodity Expenses (513) (432)
Operating And Administrative Expenses [1] (39) (40)
Recovery of Direct Costs [2] 0 0
Other Segment Income (Expenses) - Net [3] 0 0
Proportional Modified EBITDA Equity Method Investments 3 0
Modified EBITDA 152 101
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales    
Other financial information:    
Unrealized Gain (Loss) on Derivatives (10) 3
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member]    
Segment revenues [Line Items]    
Revenues [5] 0 0
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member] | External Customer    
Segment revenues [Line Items]    
Revenues [5] 0 0
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member] | Internal Customer    
Segment revenues [Line Items]    
Revenues [5] 0 0
Operating Segments [Member] | Gas & NGL Marketing Services | NonRegulated Service Commodity Consideration [Member]    
Segment revenues [Line Items]    
Revenues [5] 0 0
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member]    
Segment revenues [Line Items]    
Revenues [5] 739 587
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member] | External Customer    
Segment revenues [Line Items]    
Revenues [5] 932 707
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member] | Internal Customer    
Segment revenues [Line Items]    
Revenues [5] (193) (120)
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service    
Segment revenues [Line Items]    
Revenues [4],[5] (28) (17)
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service | Realized Gain (Loss)    
Segment revenues [Line Items]    
Revenues [5] (35) 81
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service | Unrealized Gain (Loss)    
Segment revenues [Line Items]    
Revenues [5] 7 (98)
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment    
Segment revenues [Line Items]    
Revenues 3,263 2,899
Other financial information:    
Modified EBITDA 1,878 1,761
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member]    
Segment revenues [Line Items]    
Revenues 2,070 1,965
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member] | External Customer    
Segment revenues [Line Items]    
Revenues 1,999 1,901
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member] | Internal Customer    
Segment revenues [Line Items]    
Revenues 71 64
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | NonRegulated Service Commodity Consideration [Member]    
Segment revenues [Line Items]    
Revenues 49 30
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member]    
Segment revenues [Line Items]    
Revenues 1,175 921
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member] | External Customer    
Segment revenues [Line Items]    
Revenues 1,016 811
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member] | Internal Customer    
Segment revenues [Line Items]    
Revenues 159 110
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service    
Segment revenues [Line Items]    
Revenues [4] (31) (17)
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service | Realized Gain (Loss)    
Segment revenues [Line Items]    
Revenues (38) 81
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service | Unrealized Gain (Loss)    
Segment revenues [Line Items]    
Revenues 7 (98)
Corporate, Non-Segment | Other Operating Segment    
Segment revenues [Line Items]    
Revenues 128 120
Other financial information:    
Modified EBITDA 75 76
Intersegment Eliminations [Member]    
Segment revenues [Line Items]    
Revenues $ (343) $ (248)
[1] Segment operating and administrative expenses primarily include payroll, maintenance and operating costs and taxes, and general and administrative expenses, including acquisition and transition-related expenses. It also includes project execution, information technology, finance and accounting, real estate and aviation, central engineering services, safety and operational discipline, supply chain and digital transformation, corporate strategic development, human resources, legal and government affairs, and executive and audit support services costs which are centrally managed and allocated to segments.
[2] Recoverable power, transportation and storage costs are charges incurred which are reimbursable pursuant to FERC stipulations or customer contracts.
[3] Other segment income (expenses) primarily includes equity AFUDC and regulatory credits and charges related to Williams’ regulated operations.
[4] Williams records transactions that qualify as commodity derivatives at fair value with changes in fair value recognized in earnings in the period of change and characterized as unrealized gains or losses. Gains and losses from commodity derivatives held for energy trading purposes are presented on a net basis in revenue.
[5] As Williams is acting as agent for natural gas marketing customers or engages in energy trading activities, the resulting revenues are presented net of the related costs of those activities.