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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial information | Quarterly results of operations for the years ended December 31, 2021 and 2020 are summarized below (in millions, except per share amounts):
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2021 |  |  |  |  |  |  |  |
Operating revenues |  | $ | 733 |  |  | $ | 1,499 |  |  | $ | 1,972 |  |  | $ | 1,834 |
Operating income (loss)(1) |  | (294) |  |  | 147 |  |  | 186 |  |  | (119) |
Net income (loss)(1)(2) |  | (247) |  |  | 64 |  |  | 130 |  |  | (129) |
Basic earnings (loss) per share |  | $ | (0.78) |  |  | $ | 0.20 |  |  | $ | 0.41 |  |  | $ | (0.40) |
Diluted earnings per share(1)(2) |  | N/A |  | $ | 0.20 |  |  | $ | 0.40 |  |  | N/A
2020 |  |  |  |  |  |  |  |
Operating revenues |  | $ | 1,588 |  |  | $ | 215 |  |  | $ | 492 |  |  | $ | 661 |
Operating (loss)(3) |  | (334) |  |  | (410) |  |  | (516) |  |  | (454) |
Net (loss)(3) |  | (268) |  |  | (320) |  |  | (393) |  |  | (373) |
(Loss) per share(3) |  | $ | (0.97) |  |  | $ | (1.18) |  |  | $ | (1.44) |  |  | $ | (1.31) |
Our 2021 and 2020 results include the effects of various special items. Refer to "Part II - Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" within this Report for additional 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=124502072&loc=d3e1280-108306 + Details
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