Other Comprehensive Earnings (Components Of Other Comprehensive Earnings) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Foreign currency translation:
Beginning accumulated foreign currency translation		$ 450	$ 725	$ 424	$ 983
Change in cumulative translation adjustment		(1)	(242)	52	(519)
Income tax benefit (expense)		3	30	(24)	49
Ending accumulated foreign currency translation		452	513	452	513
Pension and postretirement benefit plans:
Beginning accumulated pension and postretirement benefits		(185)	(197)	(194)	(204)
Recognition of net actuarial loss and prior service cost in earnings	[1]	7	6	20	17
Income tax benefit (expense)		4	(1)		(5)
Ending accumulated pension and postretirement benefits		(174)	(192)	(174)	(192)
Accumulated other comprehensive earnings, net of tax		$ 278	$ 321	$ 278	$ 321	$ 230

[1] These accumulated other comprehensive earnings components are included in the computation of net periodic benefit cost, which is a component of G&A on the accompanying consolidated comprehensive statements of earnings. See Note 16 for additional details.