Retirement Plans (Schedule Of Net Periodic Benefit Cost For Pension And Postretirement Benefit Plans) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 3	$ 4	$ 6	$ 8
Interest cost		10	11	20	21
Expected return on plan assets		(14)	(14)	(28)	(27)
Amortization of prior service cost	[1]	1		1	1
Net actuarial loss	[1]	3	5	7	9
Net periodic benefit cost	[2]	3	6	6	12
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	[1]	(1)	(1)	(1)	(1)
Net periodic benefit cost	[2]	$ (1)	$ (1)	$ (1)	$ (1)

[1] These net periodic benefit costs were reclassified out of other comprehensive earnings.

[2] The service cost component of net periodic benefit cost is included in G&A expense and the remaining components of net periodic benefit costs are included in other expenses in the accompanying consolidated comprehensive statements of earnings.