Equity Roll Forward (Schedule Of Change In Equity) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 8,770
Net earnings	394	$ 315
Other comprehensive income (loss)	27	$ (33)
Cash dividends	(326)
Purchases of treasury stock, net of issuances	(480)
Adoption of accounting standard update	3
Ending balance	8,388
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	8,718
Ending balance	8,349
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	392
Cash dividends	(311)
Adoption of accounting standard update	3
AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	27
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchases of treasury stock, net of issuances	(480)
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	52
Net earnings	2
Other comprehensive income (loss)	0
Cash dividends	(15)
Purchases of treasury stock, net of issuances	0
Adoption of accounting standard update	0
Ending balance	$ 39