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Pensions and Other Postretirement Benefits - Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits      
Change in benefit obligations:      
Benefit obligation at beginning of year $ 2,845 $ 2,588  
Service cost 43 40 $ 35
Interest cost 55 74 93
Actuarial (gains) losses (13) 294  
Plan amendment (2) 0  
Benefits paid (151) (151)  
Benefit obligation at end of year 2,777 2,845 2,588
Change in plan assets:      
Fair value of plan assets at beginning of year 2,675 2,462  
Actual return on plan assets 317 345  
Employer contributions 20 19  
Benefits paid (151) (151)  
Fair value of plan assets at end of year 2,861 2,675 2,462
Funded status at end of year 84 (170)  
Other assets 442 189  
Other current liabilities (20) (19)  
Other liabilities (338) (340)  
Net amount recognized 84 (170)  
Net loss 666 869  
Prior service benefit (2) 0  
Other Postretirement Benefits      
Change in benefit obligations:      
Benefit obligation at beginning of year 471 457  
Service cost 6 6 6
Interest cost 7 12 17
Actuarial (gains) losses (29) 35  
Plan amendment 0 0  
Benefits paid (38) (39)  
Benefit obligation at end of year 417 471 457
Change in plan assets:      
Fair value of plan assets at beginning of year 165 170  
Actual return on plan assets 29 21  
Employer contributions 17 13  
Benefits paid (38) (39)  
Fair value of plan assets at end of year 173 165 $ 170
Funded status at end of year (244) (306)  
Other assets 0 0  
Other current liabilities 0 0  
Other liabilities (244) (306)  
Net amount recognized (244) (306)  
Net loss 10 57  
Prior service benefit $ (202) $ (228)