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Retirement Benefits (Schedule of Fair Value Measurement of Plan Assets Using Significant Unobservable Inputs) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
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
Level 3    
Change in plan assets:    
Fair value of plan assets at beginning of period 151  
Fair value of plan assets at end of period 137 151
Int’l    
Change in plan assets:    
Fair value of plan assets at beginning of period 1,961 1,727
Foreign exchange impact (3) 66
Fair value of plan assets at end of period 2,023 1,961
Int’l | Equities    
Change in plan assets:    
Fair value of plan assets at beginning of period 108  
Fair value of plan assets at end of period 88 108
Int’l | Fixed Income    
Change in plan assets:    
Fair value of plan assets at beginning of period 1  
Fair value of plan assets at end of period 0 1
Int’l | Real Estate    
Change in plan assets:    
Fair value of plan assets at beginning of period 2  
Fair value of plan assets at end of period 1 2
Int’l | Other    
Change in plan assets:    
Fair value of plan assets at beginning of period 40  
Fair value of plan assets at end of period 48 40
Int’l | Level 3    
Change in plan assets:    
Fair value of plan assets at beginning of period 151 149
Return on assets held at end of year (15) 2
Return on assets sold during the year 38 2
Purchases, sales and settlements (37) (6)
Foreign exchange impact 0 4
Fair value of plan assets at end of period 137 151
Int’l | Level 3 | Equities    
Change in plan assets:    
Fair value of plan assets at beginning of period 108 103
Return on assets held at end of year (21) 1
Return on assets sold during the year 36 0
Purchases, sales and settlements (35) 0
Foreign exchange impact 0 4
Fair value of plan assets at end of period 88 108
Int’l | Level 3 | Fixed Income    
Change in plan assets:    
Fair value of plan assets at beginning of period 1 1
Return on assets held at end of year 0 0
Return on assets sold during the year 0 0
Purchases, sales and settlements (1) 0
Foreign exchange impact 0 0
Fair value of plan assets at end of period 0 1
Int’l | Level 3 | Real Estate    
Change in plan assets:    
Fair value of plan assets at beginning of period 2 2
Return on assets held at end of year (1) 0
Return on assets sold during the year 0 0
Purchases, sales and settlements 0 0
Foreign exchange impact 0 0
Fair value of plan assets at end of period 1 2
Int’l | Level 3 | Other    
Change in plan assets:    
Fair value of plan assets at beginning of period 40 43
Return on assets held at end of year 7 1
Return on assets sold during the year 2 2
Purchases, sales and settlements (1) (6)
Foreign exchange impact 0 0
Fair value of plan assets at end of period $ 48 $ 40