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.

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Debt (Details) - USD ($) $ in Millions		1 Months Ended
Debt (Details) - USD ($) $ in Millions	Mar. 19, 2026	Mar. 31, 2026	Sep. 30, 2026	Feb. 28, 2026
Corporate \| 4.9% Senior Notes Due 2036
Debt Instrument [Line Items]
Face amount				$ 500
Interest rate (as a percent)				4.90%
Corporate \| 3.8% Senior Notes Due 2026
Debt Instrument [Line Items]
Interest rate (as a percent)	3.80%
Amount of debt redeemed	$ 500
Boardwalk Pipelines
Debt Instrument [Line Items]
Long-term debt, current			$ 600
Boardwalk Pipelines \| 6.0% Senior Notes Due 2026
Debt Instrument [Line Items]
Interest rate (as a percent)		6.00%
Amount of debt redeemed		$ 550