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Postretirement Benefit Plans (Summary of Amounts Recognized in Financial Statements) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Change in benefit obligation:      
Benefit obligation at beginning of year $ 1,085    
Benefit obligation at end of year 513 $ 1,085  
Change in plan assets:      
Beginning Balance 679    
Ending Balance 246 679  
Unfunded status of the plans (267) (406)  
United States      
Change in benefit obligation:      
Benefit obligation at beginning of year 117 123  
Service cost 3 3 $ 3
Interest cost 3 3 3
Benefits paid (7) (7)  
Actuarial loss (gain) (a) (24) (5)  
Plan amendments, settlements and curtailments (b) 0 0  
Foreign currency translation and other 0 0  
Benefit obligation at end of year 92 117 123
Change in plan assets:      
Beginning Balance 108 113  
Employer contributions 0  
Actual return on plan assets (21) 2  
Benefits paid (7) (7)  
Plan amendments, settlements and curtailments (b) 0 0  
Foreign currency translation and other 0 0  
Ending Balance 80 108 113
Unfunded status of the plans (12) (9)  
International defined benefit pension plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 926 1,032  
Service cost 12 14 13
Interest cost 13 11 16
Benefits paid (29) (34)  
Actuarial loss (gain) (a) (241) (56)  
Plan amendments, settlements and curtailments (b) (202) (3)  
Foreign currency translation and other (89) (38)  
Benefit obligation at end of year 390 926 1,032
Change in plan assets:      
Beginning Balance 571 578  
Employer contributions 16 26  
Actual return on plan assets (133) 9  
Benefits paid (29) (34)  
Plan amendments, settlements and curtailments (b) (202) (3)  
Foreign currency translation and other (57) (5)  
Ending Balance 166 571 $ 578
Unfunded status of the plans $ (224) $ (355)