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Pensions and Other Postretirement Benefits - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 5 Months Ended 9 Months Ended
Jun. 30, 2024
May 31, 2024
Sep. 30, 2024
Sep. 30, 2023
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   $ 20 $ 0
Percent reduction in future years of service of plan participants (as a percent)   10.00%    
Benefit obligation discount rate (as a percent)   5.74%    
Reduction to benefit obligation   $ 11