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Pensions and Other Postretirement Benefits - Narrative (Details)
$ in Millions
 5 Months Ended 12 Months Ended
May 31, 2024
USD ($)
employee
Dec. 31, 2024
USD ($)
investment_firm
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan's accumulated benefit obligation   $ 1,900 $ 2,000  
Unfunded pension plans projected benefit obligation   273 300  
Unfunded pension plans accumulated benefit obligations   $ 256 273  
Number of investment firms | investment_firm   12    
Multiemployer plan, contributions by employer   $ 9 11 $ 13
Defined contribution plan, cost   25 25 22
Employee Severance        
Defined Benefit Plan Disclosure [Line Items]        
Number of management employees separated from service | employee 350      
Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Trust-owned life insurance fair value   $ 145 $ 138  
Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets target allocation for equity   50.00%    
Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets target allocation for equity   75.00%    
Debt securities        
Defined Benefit Plan Disclosure [Line Items]        
Weighted average asset allocation, by asset category   35.00% 34.00%  
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Curtailment gain $ 0      
Estimated net loss for defined pension plans amortized from AOCI into net periodic cost   $ 22    
Assumed increases in per capita cost of covered health care benefits   6.50%    
Ultimate health care cost trend rate   5.00%    
Pension plan assets target allocation for equity   75.00%    
Assumed rate of return on pension plan assets   8.00%    
Expected contribution for the next fiscal year   $ 21    
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, increase (decrease) in future years of service for plan participants, curtailment 10.00%      
Curtailment gain   20 $ 0 $ 0
Defined benefit plan, future amortization of prior service cost (credit)   (24)    
Expected contribution for the next fiscal year   $ 30    
Other Postretirement Benefits | Defined Benefit Plan, Equity Securities        
Defined Benefit Plan Disclosure [Line Items]        
Weighted average asset allocation, by asset category   65.00% 66.00%