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Unaudited Quarterly Financial Information | 12 Months Ended
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Sep. 30, 2020
Quarterly Financial Information Disclosure [Abstract] |
Unaudited Quarterly Financial Information | 24. Unaudited Quarterly Financial Information A summary of the unaudited quarterly results of operations for the years 2020 and 2019 follows. This summary should be read in conjunction with the audited consolidated financial statements appearing herein. Results for interim periods may fluctuate as a result of seasonal weather conditions, changes in rates, and other factors.
| 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 The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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