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Pension and Postretirement Benefit Plans - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2022
USD ($)
Qualified and Non-qualified Pension Benefits  
Benefit Plan Information  
Company contributions year to date $ 99
Postretirement Benefits  
Benefit Plan Information  
Company contributions year to date 3
Pension and Postretirement Benefit Plans | Minimum  
Benefit Plan Information  
Estimated pension and postretirement employer contributions in current fiscal year 100
Pension and Postretirement Benefit Plans | Maximum  
Benefit Plan Information  
Estimated pension and postretirement employer contributions in current fiscal year $ 200