Equity Roll Forward (Schedule Of Change In Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at September 30, 2014			$ 10,167
Net earnings	979	554	1,508	1,031
Other comprehensive income (loss)	(398)	10	(699)	51
Cash dividends			(654)
Net purchases of common stock			(1,354)
Balance at March 31, 2015	8,968		8,968
Parent Company [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at September 30, 2014			10,119
Net earnings			1,498
Other comprehensive income (loss)			(698)
Cash dividends			(647)
Net purchases of common stock			(1,354)
Balance at March 31, 2015	8,918		8,918
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at September 30, 2014			48
Net earnings			10
Other comprehensive income (loss)			(1)
Cash dividends			(7)
Net purchases of common stock			0
Balance at March 31, 2015	$ 50		$ 50