Basis of Presentation	6 Months Ended
Jun. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Boardwalk Pipeline Partners, LP (the Company) is a Delaware limited partnership formed in 2005 to own and operate the business conducted by its primary subsidiary Boardwalk Pipelines, LP and its operating subsidiaries, which consists of integrated pipeline and storage systems for natural gas and natural gas liquids, olefins and other hydrocarbons (herein referred to together as NGLs). As of June 30, 2025, Boardwalk Pipelines Holding Corp. (BPHC), a wholly owned subsidiary of Loews Corporation (Loews), owned directly or indirectly, 100% of the Company's capital. The accompanying unaudited condensed consolidated financial statements of the Company have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments (consisting of only normal recurring accruals) necessary to present fairly the Company's financial position as of June 30, 2025, and December 31, 2024, its results of operations, comprehensive income and changes in partners' capital for the three and six months ended June 30, 2025 and 2024, and its changes in cash flows for the six months ended June 30, 2025 and 2024, in each case in accordance with GAAP. Reference is made to the Notes to the Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2024 (2024 Annual Report on Form 10-K), which should be read in conjunction with these unaudited condensed consolidated financial statements. The accounting policies described in Note 2 of Part II, Item 8. of the Company's 2024 Annual Report on Form 10-K are the same policies that were used in preparing the accompanying unaudited condensed consolidated financial statements. Results of operations for interim periods may not necessarily be indicative of results for the full year. In 2025, the Company reorganized its legal entity structure which impacted its reporting units for purposes of goodwill. Goodwill was reallocated based on the relative fair value approach, resulting in $4.5 million of goodwill being transferred to a different reporting unit. This reorganization was considered a triggering event for purposes of interim goodwill impairment testing. As a result, during the first quarter 2025, quantitative goodwill impairment tests were performed on the impacted reporting units and no impairments were recorded. In the fourth quarter 2024, the Company began reporting its financial results in two reportable segments, Natural Gas and Natural Gas Liquids, whereas it previously reported under a single operating and reportable segment. Certain information for 2024 in Notes 2 and 10 has been recast or presented under the Company’s reportable segment presentation.

Boardwalk Pipeline Partners, LP (the Company) is a Delaware limited partnership formed in 2005 to own and operate the business conducted by its primary subsidiary Boardwalk Pipelines, LP and its operating subsidiaries, which consists of integrated pipeline and storage systems for natural gas and natural gas liquids, olefins and other hydrocarbons (herein referred to together as NGLs). As of June 30, 2025, Boardwalk Pipelines Holding Corp. (BPHC), a wholly owned subsidiary of Loews Corporation (Loews), owned directly or indirectly, 100% of the Company's capital.

The accompanying unaudited condensed consolidated financial statements of the Company have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments (consisting of only normal recurring accruals) necessary to present fairly the Company's financial position as of June 30, 2025, and December 31, 2024, its results of operations, comprehensive income and changes in partners' capital for the three and six months ended June 30, 2025 and 2024, and its changes in cash flows for the six months ended June 30, 2025 and 2024, in each case in accordance with GAAP. Reference is made to the Notes to the Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2024 (2024 Annual Report on Form 10-K), which should be read in conjunction with these unaudited condensed consolidated financial statements. The accounting policies described in Note 2 of Part II, Item 8. of the Company's 2024 Annual Report on Form 10-K are the same policies that were used in preparing the accompanying unaudited condensed consolidated financial statements. Results of operations for interim periods may not necessarily be indicative of results for the full year.

In 2025, the Company reorganized its legal entity structure which impacted its reporting units for purposes of goodwill. Goodwill was reallocated based on the relative fair value approach, resulting in $4.5 million of goodwill being transferred to a different reporting unit. This reorganization was considered a triggering event for purposes of interim goodwill impairment testing. As a result, during the first quarter 2025, quantitative goodwill impairment tests were performed on the impacted reporting units and no impairments were recorded.

In the fourth quarter 2024, the Company began reporting its financial results in two reportable segments, Natural Gas and Natural Gas Liquids, whereas it previously reported under a single operating and reportable segment. Certain information for 2024 in Notes 2 and 10 has been recast or presented under the Company’s reportable segment presentation.