Retirement Plans (Schedule Of Net Periodic Benefit Cost For Pension And Postretirement Benefit Plans) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 6	$ 8
Interest cost		12	13
Expected return on plan assets		(13)	(15)
Amortization of prior service cost	[1]	1	1
Net actuarial loss	[1]	5	5
Net periodic benefit cost	[2]	11	12
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost		$ 0	$ 0

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

[2] Net periodic benefit cost is a component of G&A in the accompanying consolidated comprehensive statements of earnings.