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Pensions and Other Postretirement Benefits - Other Changes Recognized in Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Total recognized in other comprehensive income $ (51) $ (226) $ 140
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net (gains) losses arising during the year 6    
Prior service benefit arising during the year (4)    
Amortization of net losses (49)    
Amortization of prior service benefit 0    
Total recognized in other comprehensive income (47)    
Total recognized in net periodic cost and other comprehensive income (104)    
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net (gains) losses arising during the year (29)    
Prior service benefit arising during the year 0    
Amortization of net losses 0    
Amortization of prior service benefit 25    
Total recognized in other comprehensive income (4)    
Total recognized in net periodic cost and other comprehensive income $ (27)