Equity (Schedule Of Change In Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at September 30, 2013			$ 10,718
Net earnings	554	578	1,031	1,044
Other comprehensive income (loss)	10	(96)	51	17
Cash dividends			(610)
Purchase of noncontrolling interest			(444)
Net (purchases) issuances of common stock and other			(221)
Balance at March 31, 2014	10,525		10,525
Parent Company [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at September 30, 2013			10,585
Net earnings			1,009
Other comprehensive income (loss)			53
Cash dividends			(606)
Purchase of noncontrolling interest			(343)
Net (purchases) issuances of common stock and other			(221)
Balance at March 31, 2014	10,477		10,477
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at September 30, 2013			133
Net earnings			22
Other comprehensive income (loss)			(2)
Cash dividends			(4)
Purchase of noncontrolling interest			(101)
Net (purchases) issuances of common stock and other			0
Balance at March 31, 2014	$ 48		$ 48