Employee Benefit Plans (Information About The Expected Cash Flows For The Qualified and Non-Qualified Pension Plans) (Details) $ in Millions	Dec. 31, 2018 USD ($)
Qualified Plan [Member] | Pension Plan [Member]
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 0
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	121
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	121
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	127
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	129
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	130
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	668
Nonqualified Plan [Member] | Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	9
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	9
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	10
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	24
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	17
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	13
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 56