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Pension And Other Postretirement Benefits (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Health care cost trend rate 4.50%    
Year that rate reaches ultimate trend rate 2020    
Effect of one-percentage-point increase on service and interest costs $ 74    
Effect of one-percentage-point increase on postretirement benefit obligation 776    
Effect of one-percentage-point decrease on service and interest costs 56    
Effect of one-percentage-point decrease on postretirement benefit obligation 620    
Costs for defined contribution plans $ 391 $ 384 $ 399
U.S. [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation 30.00%    
U.S. [Member] | Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation 70.00%    
U.S. [Member] | Venture Capital Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation 5.00%    
Pension Benefits - Non-U.S. [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation 30.00%    
Pension Benefits - Non-U.S. [Member] | Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation 70.00%    
Pension Benefits - Non-U.S. [Member] | Venture Capital Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation 3.00%