Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Actuarial Assumptions Used In Determining Pension And Other Postretirement Benefit Obligation) (Details) - Pension Postretirement Benefit Obligations And Other Postretirement Accumulated Postretirement Benefit Obligations [Member]	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Weighted-average rate of increase in future compensation levels	3.98%	4.23%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	4.75%	4.75%
Pre-65 Retirees [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed health care cost trend rate	6.55%	6.75%
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2026	2024
Post - 65 Retirees [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed health care cost trend rate	7.25%	7.55%
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2026	2024
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Blended weighted-average discount rate	4.39%	4.67%
Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate	4.30%	4.60%
Non-Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate	3.63%	3.84%
Minimum [Member] | Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate	4.30%	4.51%
Maximum [Member] | Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate	4.49%	4.79%