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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jul. 15, 2020
Mar. 31, 2020
Jun. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan, employer matching contribution, percent of match   7.00%  
Accrued pension and postretirement benefits     $ (45)
Other comprehensive income     34
Deferred income taxes     $ 11
Subsequent Event      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accrued pension and postretirement benefits $ (112)    
Other comprehensive income 84    
Deferred income taxes $ 28    
Pension and other postretirement benefits plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Future remaining service period of eligible active employees (in years)     3 years 4 months 24 days
Pension and other postretirement benefits plans | Subsequent Event      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Future remaining service period of eligible active employees (in years) 3 years 4 months 24 days