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Retirement Benefits (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
plan
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2022
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan expenses $ 84 $ 83 $ 63  
Funded amount 13 11    
Employee deferred compensation plan $ 64 64    
United States        
Defined Benefit Plan Disclosure [Line Items]        
Number of frozen defined benefit plans | plan 2      
Accumulated benefit obligation $ 74 80    
United Kingdom        
Defined Benefit Plan Disclosure [Line Items]        
Number of frozen defined benefit plans | plan 1      
Germany        
Defined Benefit Plan Disclosure [Line Items]        
Number of frozen defined benefit plans | plan 1      
Int’l        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated benefit obligation $ 2,100 $ 2,300    
Int’l | Scenario, Forecast        
Defined Benefit Plan Disclosure [Line Items]        
Estimated employer contributions in next fiscal year       $ 46