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Pensions and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		5 Months Ended	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	May 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	$ 0	$ 0	$ 0	$ 0	$ 0
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	$ 0	$ 20		$ 0	$ 20
Percent reduction in future years of service of plan participants (as a percent)			10.00%

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- Definition

Defined Benefit Plan, Increase (Decrease) In Future Years Of Service For Plan Participants, Percent

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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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