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Retirement Benefits (Schedule of Changes in Projected Benefit Obligations) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in plan assets:      
Fair value of plan assets at beginning of period $ 2,025    
Fair value of plan assets at end of period 2,089 $ 2,025  
United States      
Change in projected benefit obligations:      
Projected benefit obligations at beginning of period 80 76  
Service cost 0 0 $ 0
Interest cost 2 2 3
Foreign currency exchange rate changes 0 0  
Actuarial (gain) loss (3) 6  
Other 0 0  
Benefits paid (5) (4)  
Projected benefit obligations at end of period 74 80 76
Change in plan assets:      
Fair value of plan assets at beginning of period 64 60  
Actual return on plan assets 7 7  
Employer contributions 1 2  
Foreign currency exchange rate changes 0 0  
Benefits paid (5) (4)  
Other (1) (1)  
Fair value of plan assets at end of period 66 64 60
Funded status (8) (16)  
Int’l      
Change in projected benefit obligations:      
Projected benefit obligations at beginning of period 2,326 1,988  
Service cost 3 2 2
Interest cost 33 39 50
Foreign currency exchange rate changes (4) 75  
Actuarial (gain) loss (180) 287  
Other (1) (1)  
Benefits paid (75) (64)  
Projected benefit obligations at end of period 2,102 2,326 1,988
Change in plan assets:      
Fair value of plan assets at beginning of period 1,961 1,727  
Actual return on plan assets 94 189  
Employer contributions 47 44  
Foreign currency exchange rate changes (3) 66  
Benefits paid (75) (64)  
Other (1) (1)  
Fair value of plan assets at end of period 2,023 1,961 $ 1,727
Funded status $ (79) $ (365)