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Pension and Other Postretirement Benefit Plans (Change in Plan Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other Postretirement Benefits    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets, beginning of year $ 0 $ 0
Actual return on plan assets 0 0
Employer contribution 24 28
Plan participants' contributions 0 0
Benefits paid (24) (28)
Transfer of plan assets 0 0
Other adjustments 0 0
Settlements 0 0
Foreign currency exchange rates 0 0
Reclassification of plan assets to held for sale 0 0
Fair value of plan assets, end of year 0 0
United States Pension Benefits | Pension Benefits    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets, beginning of year 2,934 2,676
Actual return on plan assets 447 517
Employer contribution 5 37
Plan participants' contributions 0 0
Benefits paid (186) (263)
Transfer of plan assets 0 0
Other adjustments 0 0
Settlements (97) (33)
Foreign currency exchange rates 0 0
Reclassification of plan assets to held for sale 0 0
Fair value of plan assets, end of year 3,103 2,934
Foreign Pension Benefits | Pension Benefits    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets, beginning of year 593 518
Actual return on plan assets 58 61
Employer contribution 29 33
Plan participants' contributions 1 1
Benefits paid (33) (30)
Transfer of plan assets 0 (2)
Other adjustments 0 5
Settlements (37) (13)
Foreign currency exchange rates 21 20
Reclassification of plan assets to held for sale 0 0
Fair value of plan assets, end of year $ 632 $ 593