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Employee Benefits (Sensitivity Analysis) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Actuarial assumptions [Line Items]    
Defined benefit obligation $ 860 $ 1,068
Discount rate [Member] | Decrease 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (32)  
Discount rate [Member] | Decrease 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (16)  
Discount rate [Member] | Increase 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 16  
Discount rate [Member] | Increase 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 32  
Salary increase [Member] | Decrease 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 18  
Salary increase [Member] | Decrease 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 9  
Salary increase [Member] | Increase 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (9)  
Salary increase [Member] | Increase 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (18)  
Mortality table [Member] | Decrease 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (17)  
Mortality table [Member] | Decrease 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (9)  
Mortality table [Member] | Increase 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 9  
Mortality table [Member] | Increase 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation $ 17