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Retirement Benefits (Schedule of Pension Plan Assets Measured at Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1,787 $ 1,572  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 47 43  
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 149 126  
United States      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 60 54 $ 59
United States | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1    
United States | Investments measured at net asset value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 59 54  
United States | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1    
United States | Cash and cash equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1    
Int’l      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,727 1,518 1,673
Int’l | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 46 43  
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 149 126 74
Int’l | Investments measured at net asset value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,532 1,349  
Int’l | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 103 84  
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 103 84 26
Int’l | Fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 2  
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 1 2 5
Int’l | Real estate funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 1  
Int’l | Real estate funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Real estate funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Real estate funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 1 3
Int’l | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 8  
Int’l | Cash and cash equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 8  
Int’l | Cash and cash equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Cash and cash equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Int’l | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 87 74  
Int’l | Other | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 44 35  
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 $ 43 $ 39 $ 40