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Defined Benefit Postretirement Plans and Defined Contribution Plan - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Assumed Health Care Cost Trend Rates [Line Items]      
Estimated future employer contributions in next year $ 12    
Employer discretionary contribution amount 12 $ 13 $ 13
Unfunded Portion of Pension Plan      
Defined Benefit Plan Assumed Health Care Cost Trend Rates [Line Items]      
Estimated future employer contributions in next year 3    
Unfunded Portion of Other Postretirement Benefits Plan      
Defined Benefit Plan Assumed Health Care Cost Trend Rates [Line Items]      
Estimated future employer contributions in next year $ 8    
Equity Securities      
Defined Benefit Plan Assumed Health Care Cost Trend Rates [Line Items]      
Target allocation percentage 47.00%    
Fixed Income Securities      
Defined Benefit Plan Assumed Health Care Cost Trend Rates [Line Items]      
Target allocation percentage 53.00%