Divestiture Of Northwest Operations (Narrative) (Details) - USD ($) $ in Millions			4 Months Ended	8 Months Ended	12 Months Ended
	May 01, 2020	May 28, 2019	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Gross proceeds from divestiture					$ 1,131
Loss on disposal of Northwest Operations					162
Northwest Operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Gross proceeds from divestiture		$ 1,352
Net proceeds	$ 1,131
Net assets, Derecognized	1,132
Property, plant, and equipment, Derecognized	1,084
Goodwill, Derecognized	658
Valuation allowance, Derecognized	603
Defined benefit pension and other postretirement benefit plan obligations, Derecognized	$ 150
Loss on disposal of Northwest Operations					$ 162