Equity (Schedule Of Change In Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Total Equity [Line Items]
Beginning balance			$ 10,551
Net earnings	556	567	937	1,058
Other comprehensive income			64
Cash dividends			(612)
Net treasury stock purchases and other			(285)
Ending balance	10,655		10,655
Common Stockholders' Equity [Member]
Total Equity [Line Items]
Beginning balance			10,399
Net earnings			916
Other comprehensive income			66
Cash dividends			(588)
Net treasury stock purchases and other			(282)
Ending balance	10,511		10,511
Noncontrolling Interests In Subsidiaries [Member]
Total Equity [Line Items]
Beginning balance			152
Net earnings			21
Other comprehensive income			(2)
Cash dividends			(24)
Net treasury stock purchases and other			(3)
Ending balance	$ 144		$ 144