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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 3,171 | $ 2,558 | $ 2,863 | $ 2,411 | $ 3,166 | $ 2,651 | $ 2,938 | $ 2,382 | $ 11,003 | $ 11,137 | $ 10,956
Operating expenses | 2,402 | 2,252 | 2,087 | 2,047 | 2,569 | 2,453 | 2,362 | 2,164 | 8,788 | 9,548 | 9,503
Operating income | 769 | 306 | 776 | 364 | 597 | 198 | 576 | 218 | 2,215 | 1,589 | 1,453
Net income (loss) | $ 502 | $ 32 | $ 496 | $ 81 | $ 322 | $ (81) | $ 295 | $ (67) | $ 1,111 | $ 469 | $ 271

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