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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data (Unaudited) | Quarterly Financial Data (Unaudited) 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. The sum of the quarterly results may not equal the annual amount reported due to immaterial rounding differences. The sum of the quarterly earnings per share amounts does not equal the annual amount reported since per share amounts are computed independently for each quarter and for the full year based on respective weighted average common shares outstanding and other dilutive potential common shares.

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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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=124502072&loc=SL124452896-108306 + Details
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