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Retirement Benefits (Schedule of Pension Plan Assets Measured at Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 2,089 $ 2,025  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 6  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 137 151  
United States      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 66 64 $ 60
United States | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 2  
United States | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Investments measured at net asset value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 65 62  
United States | Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 2  
United States | Cash and equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 2  
United States | Cash and equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Cash and equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,023 1,961 1,727
Int’l | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6 4  
Int’l | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 137 151 149
Int’l | Investments measured at net asset value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,880 1,806  
Int’l | Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6 4  
Int’l | Cash and equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6 4  
Int’l | Cash and equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Cash and equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 88 108  
Int’l | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 88 108 103
Int’l | Fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 1  
Int’l | Fixed income | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Fixed income | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Fixed income | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 1 1
Int’l | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 2  
Int’l | Real estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Real estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Real estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 2 2
Int’l | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 48 40  
Int’l | Other | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Other | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 48 $ 40 $ 43