XML 80 R61.htm IDEA: XBRL DOCUMENT
v3.25.3

Segment Disclosures Recon from Segment to Consolidated - Revenues, Modified EBITDA, and Significant Expenses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | $ 2,923 | $ 2,653 | $ 8,752 | $ 7,760
Other financial information: |  |  |  |  |
Proportional Modified EBITDA Equity Method Investments |  | (250) | (227) | (717) | (693)
Depreciation, Depletion and Amortization |  | (564) | (566) | (1,754) | (1,654)
Income (Loss) from Equity Method Investments |  | 152 | 147 | 449 | 431
Other investing income (loss) - net |  | 19 | 290 | 31 | 332
Interest expense |  | (372) | (338) | (1,071) | (1,026)
Asset Retirement Obligation Accretion Expense For Nonregulated Operations |  | (23) | (17) | (71) | (56)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  | 929 | 968 | 2,608 | 2,378
Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales |  |  |  |  |
Other financial information: |  |  |  |  |
Unrealized Gain (Loss) on Derivatives |  | 2 | 1 | 4 | (3)
Service [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 2,121 | 1,911 | 6,165 | 5,653
NonRegulated Service Commodity Consideration [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 45 | 34 | 141 | 82
Product [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 701 | 703 | 2,416 | 2,158
Energy Commodities and Service |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 56 | 5 | 30 | (133)
Operating Segments [Member] | Transmission, Power & Gulf [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 1,392 | 1,170 | 3,976 | 3,357
Other financial information: |  |  |  |  |
Product Costs And Net Realized Processing Commodity Expenses |  | (139) | (87) | (381) | (188)
Operating And Administrative Expenses | [1] | (290) | (294) | (846) | (809)
Recovery of Direct Costs | [2] | (64) | (65) | (189) | (191)
Other Segment Income (Expenses) - Net | [3] | 37 | 46 | 52 | 143
Proportional Modified EBITDA Equity Method Investments |  | 37 | 41 | 110 | 136
Modified EBITDA |  | 973 | 811 | 2,722 | 2,448
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales |  |  |  |  |
Other financial information: |  |  |  |  |
Unrealized Gain (Loss) on Derivatives |  | 0 | 0 | 0 | 0
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Service [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 1,237 | 1,072 | 3,548 | 3,144
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Service [Member] | External Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 1,213 | 1,049 | 3,476 | 3,077
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Service [Member] | Internal Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 24 | 23 | 72 | 67
Operating Segments [Member] | Transmission, Power & Gulf [Member] | NonRegulated Service Commodity Consideration [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 24 | 14 | 75 | 28
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Product [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 130 | 84 | 353 | 185
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Product [Member] | External Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 42 | 30 | 99 | 85
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Product [Member] | Internal Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 88 | 54 | 254 | 100
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Energy Commodities and Service |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [4] | 1 | 0 | 0 | 0
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Energy Commodities and Service | Realized Gain (Loss) |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 1 | 0 | 0 | 0
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Energy Commodities and Service | Unrealized Gain (Loss) |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 0 | 0 | 0 | 0
Operating Segments [Member] | Northeast G & P [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 530 | 502 | 1,626 | 1,494
Other financial information: |  |  |  |  |
Product Costs And Net Realized Processing Commodity Expenses |  | (25) | (19) | (115) | (56)
Operating And Administrative Expenses | [1] | (114) | (120) | (333) | (336)
Recovery of Direct Costs | [2] | (42) | (35) | (125) | (101)
Other Segment Income (Expenses) - Net | [3] | (5) | (1) | (7) | 1
Proportional Modified EBITDA Equity Method Investments |  | 161 | 149 | 474 | 459
Modified EBITDA |  | 505 | 476 | 1,520 | 1,461
Operating Segments [Member] | Northeast G & P [Member] | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales |  |  |  |  |
Other financial information: |  |  |  |  |
Unrealized Gain (Loss) on Derivatives |  | 0 | 0 | 0 | 0
Operating Segments [Member] | Northeast G & P [Member] | Service [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 499 | 475 | 1,493 | 1,419
Operating Segments [Member] | Northeast G & P [Member] | Service [Member] | External Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 495 | 473 | 1,482 | 1,410
Operating Segments [Member] | Northeast G & P [Member] | Service [Member] | Internal Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 4 | 2 | 11 | 9
Operating Segments [Member] | Northeast G & P [Member] | NonRegulated Service Commodity Consideration [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 0 | 1 | 1 | 1
Operating Segments [Member] | Northeast G & P [Member] | Product [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 31 | 26 | 132 | 74
Operating Segments [Member] | Northeast G & P [Member] | Product [Member] | External Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 7 | 8 | 42 | 15
Operating Segments [Member] | Northeast G & P [Member] | Product [Member] | Internal Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 24 | 18 | 90 | 59
Operating Segments [Member] | Northeast G & P [Member] | Energy Commodities and Service |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [4] | 0 | 0 | 0 | 0
Operating Segments [Member] | Northeast G & P [Member] | Energy Commodities and Service | Realized Gain (Loss) |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 0 | 0 | 0 | 0
Operating Segments [Member] | Northeast G & P [Member] | Energy Commodities and Service | Unrealized Gain (Loss) |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 0 | 0 | 0 | 0
Operating Segments [Member] | West [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 712 | 663 | 2,113 | 1,985
Other financial information: |  |  |  |  |
Product Costs And Net Realized Processing Commodity Expenses |  | (211) | (210) | (666) | (636)
Operating And Administrative Expenses | [1] | (150) | (157) | (452) | (444)
Recovery of Direct Costs | [2] | (17) | (13) | (46) | (36)
Other Segment Income (Expenses) - Net | [3] | (28) | 5 | (18) | 3
Proportional Modified EBITDA Equity Method Investments |  | 36 | 35 | 106 | 96
Modified EBITDA |  | 342 | 323 | 1,037 | 968
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 | 0 | 0
Operating Segments [Member] | West [Member] | Service [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 470 | 426 | 1,354 | 1,270
Operating Segments [Member] | West [Member] | Service [Member] | External Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 409 | 385 | 1,195 | 1,154
Operating Segments [Member] | West [Member] | Service [Member] | Internal Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 61 | 41 | 159 | 116
Operating Segments [Member] | West [Member] | NonRegulated Service Commodity Consideration [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 21 | 19 | 65 | 53
Operating Segments [Member] | West [Member] | Product [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 219 | 218 | 693 | 657
Operating Segments [Member] | West [Member] | Product [Member] | External Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 38 | 47 | 109 | 153
Operating Segments [Member] | West [Member] | Product [Member] | Internal Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 181 | 171 | 584 | 504
Operating Segments [Member] | West [Member] | Energy Commodities and Service |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [4] | 2 | 0 | 1 | 5
Operating Segments [Member] | West [Member] | Energy Commodities and Service | Realized Gain (Loss) |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 2 | 0 | 1 | 5
Operating Segments [Member] | West [Member] | Energy Commodities and Service | Unrealized Gain (Loss) |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 0 | 0 | 0 | 0
Operating Segments [Member] | Gas & NGL Marketing Services |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [5] | 448 | 482 | 1,548 | 1,343
Other financial information: |  |  |  |  |
Product Costs And Net Realized Processing Commodity Expenses |  | (398) | (450) | (1,332) | (1,269)
Operating And Administrative Expenses | [1] | (14) | (22) | (72) | (85)
Recovery of Direct Costs | [2] | 0 | 0 | 0 | 0
Other Segment Income (Expenses) - Net | [3] | 0 | 0 | 1 | 0
Proportional Modified EBITDA Equity Method Investments |  | 16 | 0 | 27 | 0
Modified EBITDA |  | 54 | 11 | 176 | (14)
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 |  | 2 | 1 | 4 | (3)
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [5] | 0 | 0 | 0 | 0
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member] | External Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [5] | 0 | 0 | 0 | 0
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member] | Internal Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [5] | 0 | 0 | 0 | 0
Operating Segments [Member] | Gas & NGL Marketing Services | NonRegulated Service Commodity Consideration [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [5] | 0 | 0 | 0 | 0
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [5] | 415 | 481 | 1,557 | 1,491
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member] | External Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [5] | 576 | 585 | 2,037 | 1,800
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member] | Internal Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [5] | (161) | (104) | (480) | (309)
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [4],[5] | 33 | 1 | (9) | (148)
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service | Realized Gain (Loss) |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [5] | (11) | (8) | (44) | 40
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service | Unrealized Gain (Loss) |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [5] | 44 | 9 | 35 | (188)
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 3,082 | 2,817 | 9,263 | 8,179
Other financial information: |  |  |  |  |
Modified EBITDA |  | 1,874 | 1,621 | 5,455 | 4,863
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 2,206 | 1,973 | 6,395 | 5,833
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member] | External Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 2,117 | 1,907 | 6,153 | 5,641
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member] | Internal Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 89 | 66 | 242 | 192
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | NonRegulated Service Commodity Consideration [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 45 | 34 | 141 | 82
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 795 | 809 | 2,735 | 2,407
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member] | External Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 663 | 670 | 2,287 | 2,053
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member] | Internal Customer |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 132 | 139 | 448 | 354
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues | [4] | 36 | 1 | (8) | (143)
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service | Realized Gain (Loss) |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | (8) | (8) | (43) | 45
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service | Unrealized Gain (Loss) |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 44 | 9 | 35 | (188)
Corporate, Non-Segment | Other Operating Segment |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | 160 | 103 | 478 | 311
Other financial information: |  |  |  |  |
Modified EBITDA |  | 93 | 58 | 286 | 181
Intersegment Eliminations [Member] |  |  |  |  |
Segment revenues [Line Items] |  |  |  |  |
Revenues |  | $ (319) | $ (267) | $ (989) | $ (730)
[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, as well as the write-off of certain compression assets in the West segment in the third quarter of 2025 (Note 8 – Fair Value Measurements and Guarantees).
[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.

X
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-12 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 48 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-48 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 49 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-49 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-6 + Details
Name: | us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-4 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 21 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-21 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-14 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478671/942-235-S50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-05(b)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-1 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 48 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-48 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 12: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(11)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 14: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-31 Reference 15: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 16: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of income (loss) for proportionate share of equity method investee's income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481664/323-10-45-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + Details
Name: | us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of interest expense classified as nonoperating. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-4 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-14 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_InterestExpenseNonoperating
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate amount of income from investments (for example, dividends) not considered a component of the entity's core operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_InvestmentIncomeNonoperating
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Return of or reimbursements received in relation to direct costs and expenses previously paid or incurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_RecoveryOfDirectCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478671/942-235-S50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-05(b)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-42 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(i)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-14 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-11 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 48 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-48 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 14: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 15: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(i)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A Reference 19: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(ii)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iii)(A)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A Reference 21: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iv)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A Reference 22: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A Reference 23: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(i)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B Reference 24: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(A)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B Reference 25: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(B)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B Reference 26: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iv)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B Reference 27: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B Reference 28: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 Reference 29: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 30: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-40 Reference 31: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 32: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingRevenueReconcilingItemLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)(c)(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)(c)(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)(c)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)(c)(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5A -Subparagraph (SX 210.12-13A(Column F)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5A + Details
Name: | us-gaap_UnrealizedGainLossOnDerivatives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Asset Retirement Obligation Accretion Expense For Nonregulated Operations + References No definition available. + Details
Name: | wmb_AssetRetirementObligationAccretionExpenseForNonregulatedOperations
Namespace Prefix: | wmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of our segment operating performance measure, calculated as Net income (loss) before Provision (benefit) for income taxes; Interest incurred, net of interest capitalized; Equity earnings (losses); Impairment of equity-method investments; Other investing income (loss) – net; Impairment of goodwill; Depreciation and amortization expense; Accretion expense associated with asset retirement obligations for nonregulated operations. This measure is further adjusted to include our proportionate share (based on ownership interest) of Modified EBITDA from our equity-method investments calculated consistently with the definition described above. + References No definition available. + Details
Name: | wmb_ModifiedEBITDAEarningsLoss
Namespace Prefix: | wmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Operating and Administrative Expenses + References No definition available. + Details
Name: | wmb_OperatingAndAdministrativeExpenses
Namespace Prefix: | wmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other financial information. + References No definition available. + Details
Name: | wmb_OtherFinancialInformationAbstract
Namespace Prefix: | wmb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other Segment Income (Expenses) - Net + References No definition available. + Details
Name: | wmb_OtherSegmentIncomeExpensesNet
Namespace Prefix: | wmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Product Costs and Net Realized Processing Commodity Expenses + References No definition available. + Details
Name: | wmb_ProductCostsAndNetRealizedProcessingCommodityExpenses
Namespace Prefix: | wmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proportional Modified EBITDA Equity Method Investments + References No definition available. + Details
Name: | wmb_ProportionalModifiedEBITDAEquityMethodInvestments
Namespace Prefix: | wmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_EnergyRelatedDerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=wmb_NonRegulatedServiceCommodityConsiderationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ProductMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_EnergyCommoditiesAndServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wmb_TransmissionPowerGulfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | wmb_CustomerAxisAxis=wmb_ExternalCustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | wmb_CustomerAxisAxis=wmb_InternalCustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | wmb_StatusOfGainLossAxis=wmb_RealizedGainLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | wmb_StatusOfGainLossAxis=wmb_UnrealizedGainLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wmb_NortheastGPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wmb_WestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wmb_GasNGLMarketingServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_ReportableSegmentAggregationBeforeOtherOperatingSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |