Pension And Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Pension Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate for determining projected benefit obligation	4.10%		4.50%
Discount rate in effect for determining net cost, Service Costs	4.30%
Discount rate in effect for determining net cost, Interest Costs	3.70%
Actual Long-term Rate of Return on Plan Assets	5.80%
Expected Long-term Rate of Return on Plan Assets	7.00%
Pension Benefit [Member] | Other Income (Expense) [Member]
Defined Benefit Plan Disclosure [Line Items]
Special termination benefits	$ 93
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net supplemental retirement pension benefits costs	$ 25	$ 21