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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 3,166 | $ 2,651 | $ 2,938 | $ 2,382 | $ 3,034 | $ 2,602 | $ 2,741 | $ 2,579 | $ 11,137 | $ 10,956 | $ 11,220
Operating expenses | 2,569 | 2,453 | 2,362 | 2,164 | 2,276 | 2,324 | 2,380 | 2,523 | 9,548 | 9,503 | 9,920
Operating income | 597 | 198 | 576 | 218 | 758 | 278 | 361 | 56 | 1,589 | 1,453 | 1,300
Net income (loss) | $ 322 | $ (81) | $ 295 | $ (67) | $ 474 | $ (12) | $ 54 | $ (245) | $ 469 | $ 271 | $ 60

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