Equity (Schedule Of Change In Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Total Stockholders' Equity [Line Items]
Beginning balance			$ 10,442
Net earnings	578	556	1,044	937
Other comprehensive income (loss)	(96)	161	17	119
Cash dividends			(621)
Net treasury stock purchases and other			(208)
Ending balance	10,674		10,674
Common Stockholders' Equity [Member]
Total Stockholders' Equity [Line Items]
Beginning balance			10,295
Net earnings			1,015
Other comprehensive income (loss)			23
Cash dividends			(593)
Net treasury stock purchases and other			(208)
Ending balance	10,532		10,532
Noncontrolling Interest [Member]
Total Stockholders' Equity [Line Items]
Beginning balance			147
Net earnings			29
Other comprehensive income (loss)			(6)
Cash dividends			(28)
Net treasury stock purchases and other			0
Ending balance	$ 142		$ 142