Planned Divestiture Of Northwest Operations (Schedule Of Assets And Liabilities Held For Sale) (Details) $ in Millions	Jun. 30, 2019 USD ($)
Planned Divestiture Of Northwest Operations [Abstract]
Accounts receivable, less allowances of $7	$ 50
Prepaid expenses	2
Other current assets	13
Property, plant and equipment, net	999
Goodwill	658
Other intangibles, net	30
Valuation allowance on assets held for sale	(376)
Other assets	29
Total assets held for sale	1,405
Accounts payable	12
Advanced billings	18
Accrued other taxes	12
Other current liabilities	22
Total liabilities held for sale	134
Pension and other postretirement benefits	31
Other liabilities	39
Allowance for accounts receivable, classified as held for sale	7
Pension liability	$ 156