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Pension and Other Postretirement Benefits - Narrative (Details) - Subsequent Event - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2021
Dec. 31, 2021
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 271    
Forecast      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Contributions by Employer     $ 175
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement   $ 1,300