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Selected Quarterly Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Selected Quarterly Data (Unaudited) [Abstract] |
Selected Quarterly Data (Unaudited) |
Millions, Except Per Share Amounts |  |  |  |  |  |  |  |
2020 | Mar. 31 | Jun. 30 | Sep. 30 | Dec. 31
Operating revenues | $ | 5,229 | $ | 4,244 | $ | 4,919 | $ | 5,141
Operating income |  | 2,143 |  | 1,654 |  | 2,031 |  | 2,006
Net income |  | 1,474 |  | 1,132 |  | 1,363 |  | 1,380
Net income per share: |  |  |  |  |  |  |  |
Basic |  | 2.15 |  | 1.67 |  | 2.02 |  | 2.05
Diluted |  | 2.15 |  | 1.67 |  | 2.01 |  | 2.05
Millions, Except Per Share Amounts |  |  |  |  |  |  |  |
2019 | Mar. 31 | Jun. 30 | Sep. 30 | Dec. 31
Operating revenues | $ | 5,384 | $ | 5,596 | $ | 5,516 | $ | 5,212
Operating income |  | 1,960 |  | 2,260 |  | 2,234 |  | 2,100
Net income |  | 1,391 |  | 1,570 |  | 1,555 |  | 1,403
Net income per share: |  |  |  |  |  |  |  |
Basic |  | 1.94 |  | 2.23 |  | 2.22 |  | 2.03
Diluted |  | 1.93 |  | 2.22 |  | 2.22 |  | 2.02

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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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- References No definition available. + Details
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