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Unaudited Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Unaudited Quarterly Financial Information | Unaudited Quarterly Financial Information (In Thousands, Except Per Share Data)
Quarter Ended | Mar 31 |  | Jun 30 |  | Sep 30 |  | Dec 31
2019 |  |  |  |  |  |  |
Operating Revenues and Other | $ | 4,058,642 |  |  | $ | 4,697,630 |  |  | $ | 4,303,455 |  |  | $ | 4,320,246 |
Operating Income | $ | 876,530 |  |  | $ | 1,130,771 |  |  | $ | 827,959 |  |  | $ | 863,751 |
Income Before Income Taxes | $ | 827,236 |  |  | $ | 1,089,366 |  |  | $ | 797,457 |  |  | $ | 831,208 |
Income Tax Provision | 191,810 |  |  | 241,525 |  |  | 182,335 |  |  | 194,687 |
Net Income | $ | 635,426 |  |  | $ | 847,841 |  |  | $ | 615,122 |  |  | $ | 636,521 |
Net Income Per Share (1) |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 1.10 |  |  | $ | 1.47 |  |  | $ | 1.06 |  |  | $ | 1.10 |
Diluted | $ | 1.10 |  |  | $ | 1.46 |  |  | $ | 1.06 |  |  | $ | 1.10 |
Average Number of Common Shares |  |  |  |  |  |  |  |  |  |  |
Basic | 577,207 |  |  | 577,460 |  |  | 577,839 |  |  | 578,219 |
Diluted | 580,222 |  |  | 580,247 |  |  | 581,271 |  |  | 580,849 |
2018 |  |  |  |  |  |  |  |  |  |  |
Operating Revenues and Other | $ | 3,681,162 |  |  | $ | 4,238,077 |  |  | $ | 4,781,624 |  |  | $ | 4,574,536 |
Operating Income | $ | 874,588 |  |  | $ | 964,931 |  |  | $ | 1,506,687 |  |  | $ | 1,123,140 |
Income Before Income Taxes | $ | 813,359 |  |  | $ | 892,936 |  |  | $ | 1,446,363 |  |  | $ | 1,088,340 |
Income Tax Provision | 174,770 |  |  | 196,205 |  |  | 255,411 |  |  | 195,572 |
Net Income | $ | 638,589 |  |  | $ | 696,731 |  |  | $ | 1,190,952 |  |  | $ | 892,768 |
Net Income Per Share (1) |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 1.11 |  |  | $ | 1.21 |  |  | $ | 2.06 |  |  | $ | 1.55 |
Diluted | $ | 1.10 |  |  | $ | 1.20 |  |  | $ | 2.05 |  |  | $ | 1.54 |
Average Number of Common Shares |  |  |  |  |  |  |  |  |  |  |
Basic | 575,775 |  |  | 576,135 |  |  | 577,254 |  |  | 577,035 |
Diluted | 579,726 |  |  | 580,375 |  |  | 581,559 |  |  | 580,288 |
(1) The sum of quarterly net income per share may not agree with total year net income per share as each quarterly computation is based on the weighted average of common shares outstanding.

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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=118952077&loc=d3e1280-108306 + Details
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