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Employee Benefits (Sensitivity Analysis) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Actuarial assumptions [Line Items]    
Defined benefit obligation $ 1,004 $ 860
Discount rate [Member] | Decrease 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (24)  
Discount rate [Member] | Decrease 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (12)  
Discount rate [Member] | Increase 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 12  
Discount rate [Member] | Increase 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 24  
Salary increase [Member] | Decrease 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 16  
Salary increase [Member] | Decrease 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 8  
Salary increase [Member] | Increase 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (8)  
Salary increase [Member] | Increase 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (16)  
Mortality table [Member] | Decrease 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (22)  
Mortality table [Member] | Decrease 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (11)  
Mortality table [Member] | Increase 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 11  
Mortality table [Member] | Increase 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation $ 22