Pension And Other Retirement Plans Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 12, 2018	Dec. 31, 2018
Scenario, Forecast | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer		$ 36
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year		11
Scenario, Forecast | Other Post Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer		$ 1
Subsequent Event | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	$ 25