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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Total recognized in other comprehensive income $ (226) $ 140 $ (101)
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net gains arising during the year (137)    
Prior service effect of plan amendment (2)    
Amortization of net losses (66)    
Amortization of prior service benefit 0    
Total recognized in other comprehensive income (205)    
Total recognized in net periodic cost and other comprehensive income (234)    
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net gains arising during the year (46)    
Prior service effect of plan amendment 0    
Amortization of net losses (1)    
Amortization of prior service benefit 26    
Total recognized in other comprehensive income (21)    
Total recognized in net periodic cost and other comprehensive income $ (45)