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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Tables) | 12 Months Ended
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Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract] |
Unaudited Quarterly Financial Information |
Unaudited Quarterly Financial Information
2018
| First |  | Second |  | Third |  | Fourth |  | Total
Operating revenues | $ | 2,549 |  |  | $ | 2,792 |  |  | $ | 2,707 |  |  | $ | 3,185 |  |  | $ | 11,233 |
Operating expenses | 1,951 |  |  | 2,027 |  |  | 1,942 |  |  | 3,001 |  |  | 8,921 |
Operating income | 598 |  |  | 765 |  |  | 765 |  |  | 184 |  |  | 2,312 |
Net income (loss) | 288 |  |  | 462 |  |  | 470 |  |  | (101 | ) |  | 1,119 |
Unaudited Quarterly Financial Information
2017
| First |  | Second |  | Third |  | Fourth |  | Total
Operating revenues | $ | 2,546 |  |  | $ | 2,547 |  |  | $ | 2,571 |  |  | $ | 3,075 |  |  | $ | 10,739 |
Operating expenses | 2,117 |  |  | 2,013 |  |  | 2,010 |  |  | 2,624 |  |  | 8,764 |
Operating income | 429 |  |  | 534 |  |  | 561 |  |  | 451 |  |  | 1,975 |
Net income (loss) | 102 |  |  | 211 |  |  | 233 |  |  | 139 |  |  | 685 |

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- References No definition available. + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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