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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Tables) | 12 Months Ended
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Sep. 30, 2016
Quarterly Financial Information Disclosure [Abstract] |
Unaudited Quarterly Financial Information |
Unaudited Quarterly Financial Information
2016
| First |  | Second |  | Third |  | Fourth |  | Total
Operating revenues | $ | 2,280 |  |  | $ | 2,571 |  |  | $ | 2,479 |  |  | $ | 3,286 |  |  | $ | 10,616 |
Operating expenses | 2,052 |  |  | 1,982 |  |  | 1,913 |  |  | 2,343 |  |  | 8,290 |
Operating income | 228 |  |  | 589 |  |  | 566 |  |  | 943 |  |  | 2,326 |
Net income (loss) | (37 | ) |  | 318 |  |  | 291 |  |  | 661 |  |  | 1,233 |
Unaudited Quarterly Financial Information
2015
| First |  | Second |  | Third |  | Fourth |  | Total
Operating revenues | $ | 2,411 |  |  | $ | 2,863 |  |  | $ | 2,558 |  |  | $ | 3,171 |  |  | $ | 11,003 |
Operating expenses | 2,047 |  |  | 2,087 |  |  | 2,252 |  |  | 2,402 |  |  | 8,788 |
Operating income | 364 |  |  | 776 |  |  | 306 |  |  | 769 |  |  | 2,215 |
Net income (loss) | 81 |  |  | 496 |  |  | 32 |  |  | 502 |  |  | 1,111 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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