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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Total recognized in other comprehensive income $ 140 $ (101) $ 148
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Net loss arising during the year 139    
Amortization of net losses (51)    
Amortization of prior service (cost) benefit (1)    
Total recognized in other comprehensive income 87    
Total recognized in net periodic cost and other comprehensive income 63    
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Net loss arising during the year 28    
Amortization of net losses 0    
Amortization of prior service (cost) benefit 25    
Total recognized in other comprehensive income 53    
Total recognized in net periodic cost and other comprehensive income $ 32