Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2019

Defined Benefit Plan [Abstract]

Retirement Plans, Unfunded Commitments and Redemption [Table Text Block]

Investment	Unfunded commitments (in millions, approximately)		Redemption
			Frequency	Notice period
Pooled separate accounts	na		Daily	< $1 million, 1 day >= $1 million, 3 days
Limited partnerships	$	—	Investments in these limited partnerships are illiquid and voluntary withdrawal is prohibited.

Schedule Of Amounts In Accumulated Other Comprehensive Income (Loss) Expected To Be Recognized As An Expense Component Of Net Periodic Benefit Cost For The Plans

(In millions)	Pension		Supplemental Retirement		Postretirement
Net loss	$	(17)	$	—	$	—

Schedule Of Weighted Average Assumptions Based On The Pension Plan

	2019		2018		2017
Used to determine benefit obligation at year-end:
Discount rate	3.20	%	4.20	%	3.50	%
Used to determine net periodic benefit cost for the years ended December 31:
Discount rate	4.20		3.50		4.10
Expected long-term return on plan assets	5.25		5.75		7.25