Equity (Schedule Of Change In Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Total Equity [Line Items]
Beginning balance	$ 10,551
Net earnings	381	491
Other comprehensive income	(69)
Cash dividends	(307)
Net treasury stock purchases and other	(223)
Ending balance	10,333
Common Stockholders' Equity [Member]
Total Equity [Line Items]
Beginning balance	10,399
Net earnings	371
Other comprehensive income	(67)
Cash dividends	(294)
Net treasury stock purchases and other	(219)
Ending balance	10,190
Noncontrolling Interests In Subsidiaries [Member]
Total Equity [Line Items]
Beginning balance	152
Net earnings	10
Other comprehensive income	(2)
Cash dividends	(13)
Net treasury stock purchases and other	(4)
Ending balance	$ 143