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Benefit Plans - Components of Net Periodic Postretirement Health Care Costs (Details) - Postretirement Health Care Plan - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 2 $ 4 $ 5
Interest cost 9 8 12
Net loss/(gain) 1 2 7
Prior service credit 0 0 (30)
Net periodic postretirement health care costs/(benefit) $ 12 $ 14 $ (6)