Equity (Schedule Of Change In Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Total Equity [Line Items]
Beginning balance	$ 10,442
Net earnings	466	381
Other comprehensive income (loss)	113	(42)
Cash dividends	(315)
Net treasury stock purchases and other	(88)
Ending balance	10,618
Common Stockholders' Equity [Member]
Total Equity [Line Items]
Beginning balance	10,295
Net earnings	454
Other comprehensive income (loss)	114
Cash dividends	(297)
Net treasury stock purchases and other	(88)
Ending balance	10,478
Noncontrolling Interests In Subsidiaries [Member]
Total Equity [Line Items]
Beginning balance	147
Net earnings	12
Other comprehensive income (loss)	(1)
Cash dividends	(18)
Net treasury stock purchases and other	0
Ending balance	$ 140