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Pensions and Other Postretirement Benefits - Narrative (Details) $ in Millions	3 Months Ended	5 Months Ended	9 Months Ended
	Jun. 30, 2024 USD ($)	May 31, 2024 USD ($) employee	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)
Employee Severance
Defined Benefit Plan Disclosure [Line Items]
Number of management employees separated from service | employee		350
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain		$ 0	$ 0	$ 0
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	$ 20		$ 0	$ 20
Percent reduction in future years of service of plan participants (as a percent)		10.00%

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