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Pensions and Other Postretirement Benefits - Other Changes Recognized in Other Comprehensive Loss (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Net gains arising during the year $ (45)
Prior service benefit arising during the year 0
Amortization of net losses (4)
Amortization of prior service benefit 1
Total recognized in other comprehensive income (48)
Total recognized in net periodic cost and other comprehensive income (120)
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Net gains arising during the year (9)
Prior service benefit arising during the year (5)
Amortization of net losses 0
Amortization of prior service benefit 26
Total recognized in other comprehensive income 12
Total recognized in net periodic cost and other comprehensive income $ (4)