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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Tables) | 12 Months Ended
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Sep. 30, 2020
Quarterly Financial Information Disclosure [Abstract] |
Unaudited Quarterly Financial Information |
| Unaudited Quarterly Financial Information
| 2020
| First |  | Second |  | Third |  | Fourth |  | Total
Operating revenues | $ | 2,578 |  |  | $ | 2,521 |  |  | $ | 2,251 |  |  | $ | 2,899 |  |  | $ | 10,249 |
Operating expenses | 2,046 |  |  | 1,914 |  |  | 1,716 |  |  | 1,862 |  |  | 7,538 |
Operating income | 532 |  |  | 607 |  |  | 535 |  |  | 1,037 |  |  | 2,711 |
Net income (loss) | 192 |  |  | 255 |  |  | 205 |  |  | 700 |  |  | 1,352 |
| 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 |

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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=121640914&loc=d3e1280-108306 + Details
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