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Employee Benefits (Sensitivity Analysis) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Actuarial assumptions [Line Items]    
Defined benefit obligation $ 1,075 $ 1,004
Discount rate [Member] | Decrease 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 22  
Discount rate [Member] | Decrease 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 11  
Discount rate [Member] | Increase 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (11)  
Discount rate [Member] | Increase 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (22)  
Salary increase [Member] | Decrease 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (19)  
Salary increase [Member] | Decrease 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (10)  
Salary increase [Member] | Increase 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 10  
Salary increase [Member] | Increase 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 19  
Mortality table [Member] | Decrease 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 26  
Mortality table [Member] | Decrease 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation 13  
Mortality table [Member] | Increase 5% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation (13)  
Mortality table [Member] | Increase 10% [Member]    
Actuarial assumptions [Line Items]    
Defined benefit obligation $ (26)