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Pensions and Other Postretirement Benefits - Other Changes Recognized in Other Comprehensive Loss (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Net gains arising during the year $ (69)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (17)
Amortization of prior service benefit 1
Prior service benefit arising during the year 0
Effect of curtailment 0
Total recognized in other comprehensive income (85)
Total recognized in net periodic cost and other comprehensive income (139)
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Net gains arising during the year (31)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax 1
Amortization of prior service benefit 23
Prior service benefit arising during the year 20
Effect of curtailment 2
Total recognized in other comprehensive income 15
Total recognized in net periodic cost and other comprehensive income $ (21)