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Pensions and Other Postretirement Benefits - Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Benefits      
Change in benefit obligations:      
Benefit obligation at beginning of year $ 2,777 $ 2,845  
Service cost 40 43 $ 40
Interest cost 67 55 74
Actuarial gains (677) (13)  
Plan amendments (4) (2)  
Benefits paid (152) (151)  
Benefit obligation at end of year 2,051 2,777 2,845
Change in plan assets:      
Fair value of plan assets at beginning of year 2,861 2,675  
Actual return on plan assets (470) 317  
Employer contributions 21 20  
Benefits paid (152) (151)  
Fair value of plan assets at end of year 2,260 2,861 2,675
Funded status at end of year 209 84  
Other assets 484 442  
Other current liabilities (20) (20)  
Other liabilities (255) (338)  
Net amount recognized 209 84  
Net (gain) loss 623 666  
Prior service benefit (6) (2)  
Other Postretirement Benefits      
Change in benefit obligations:      
Benefit obligation at beginning of year 417 471  
Service cost 6 6 6
Interest cost 9 7 12
Actuarial gains (70) (29)  
Plan amendments 0 0  
Benefits paid (36) (38)  
Benefit obligation at end of year 326 417 471
Change in plan assets:      
Fair value of plan assets at beginning of year 173 165  
Actual return on plan assets (28) 29  
Employer contributions 13 17  
Benefits paid (36) (38)  
Fair value of plan assets at end of year 122 173 $ 165
Funded status at end of year (204) (244)  
Other assets 0 0  
Other current liabilities 0 0  
Other liabilities (204) (244)  
Net amount recognized (204) (244)  
Net (gain) loss (19) 10  
Prior service benefit $ (177) $ (202)