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Pensions and Other Postretirement Benefits - Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Plan      
Change in benefit obligations:      
Benefit obligation at beginning of year $ 2,588 $ 2,371  
Service cost 40 35 $ 39
Interest cost 74 93 83
Actuarial losses 294 235  
Plan amendment 0 0  
Benefits paid (151) (146)  
Benefit obligation at end of year 2,845 2,588 2,371
Change in plan assets:      
Fair value of plan assets at beginning of year 2,462 2,105  
Actual return on plan assets 345 485  
Employer contribution 19 18  
Benefits paid (151) (146)  
Fair value of plan assets at end of year 2,675 2,462 2,105
Funded status at end of year (170) (126)  
Other assets 189 194  
Other current liabilities (19) (18)  
Other liabilities (340) (302)  
Net amount recognized (170) (126)  
Net loss 869 781  
Prior service cost (benefit) 0 1  
OPEB      
Change in benefit obligations:      
Benefit obligation at beginning of year 457 466  
Service cost 6 6 7
Interest cost 12 17 15
Actuarial losses 35 28  
Plan amendment 0 (18)  
Benefits paid (39) (42)  
Benefit obligation at end of year 471 457 466
Change in plan assets:      
Fair value of plan assets at beginning of year 170 158  
Actual return on plan assets 21 34  
Employer contribution 13 20  
Benefits paid (39) (42)  
Fair value of plan assets at end of year 165 170 $ 158
Funded status at end of year (306) (287)  
Other assets 0 0  
Other current liabilities 0 0  
Other liabilities (306) (287)  
Net amount recognized (306) (287)  
Net loss 57 29  
Prior service cost (benefit) $ (228) $ (253)