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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2012 First Quarter	Dec. 31, 2011 First Quarter	Mar. 31, 2013 Second Quarter	Mar. 31, 2012 Second Quarter	Jun. 30, 2013 Third Quarter	Jun. 30, 2012 Third Quarter	Sep. 30, 2013 Fourth Quarter	Sep. 30, 2012 Fourth Quarter
Operating revenues	$ 10,956	$ 11,220	$ 11,841	$ 2,579	$ 2,568	$ 2,741	$ 2,604	$ 2,602	$ 2,777	$ 3,034	$ 3,271
Operating expenses	9,503	9,920	10,404	2,523	2,431	2,380	2,358	2,324	2,499	2,276	2,632
Operating income	1,453	1,300	1,437	56	137	361	246	278	278	758	639
Net income (loss)	$ 271	$ 60	$ 162	$ (245)	$ (173)	$ 54	$ (94)	$ (12)	$ (23)	$ 474	$ 350

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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