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Employee Benefits (Schedule Of Accumulated Benefit Obligations In Excess Of Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
United States [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 563 $ 526  
United States [Member] | Underfunded Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation (748) (703)  
Accumulated benefit obligation (748) (703)  
Fair value of plan assets 563 526  
United States [Member] | Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0 $ 0
Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 21 19  
Foreign Plan [Member] | Underfunded Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation (164) (143)  
Accumulated benefit obligation (163) (138)  
Fair value of plan assets 13 18  
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0 $ 0 $ 0