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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Tables) | 12 Months Ended
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Sep. 30, 2019
Quarterly Financial Information Disclosure [Abstract] |
Unaudited Quarterly Financial Information |
| Unaudited Quarterly Financial Information
| 2019
| First |  | Second |  | Third |  | Fourth |  | Total
Operating revenues | $ | 2,725 |  |  | $ | 2,750 |  |  | $ | 2,604 |  |  | $ | 3,239 |  |  | $ | 11,318 |
Operating expenses | 1,960 |  |  | 2,158 |  |  | 2,088 |  |  | 2,301 |  |  | 8,507 |
Operating income | 765 |  |  | 592 |  |  | 516 |  |  | 938 |  |  | 2,811 |
Net income (loss) | 423 |  |  | 241 |  |  | 165 |  |  | 588 |  |  | 1,417 |
| 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 |  |  | 2,745 |  |  | 8,665 |
Operating income | 598 |  |  | 765 |  |  | 765 |  |  | 440 |  |  | 2,568 |
Net income (loss) | 288 |  |  | 462 |  |  | 470 |  |  | (101 | ) |  | 1,119 |

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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=118952077&loc=d3e1280-108306 + Details
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