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Unaudited Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Summary of Unaudited Quarterly Financial Data | Summarized unaudited quarterly financial data is as follows:
| Quarter Ended |  |  |  |  |  |
| 2019 |  |  |  |  |  |
(In millions, except per share data) | December 31 |  | September 30 |  | June 30 |  | March 31
Operating revenues | $ | 2,195 |  |  | $ | 2,996 |  |  | $ | 2,465 |  |  | $ | 2,165 |
Operating income | 209 |  |  | 540 |  |  | 320 |  |  | 221 |
Net income from continuing operations | 3,463 |  |  | 374 |  |  | 189 |  |  | 94 |
(Loss)/income from discontinued operations | (78) |  |  | (2) |  |  | 13 |  |  | 388 |
Net income | 3,385 |  |  | 372 |  |  | 202 |  |  | 482 |
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests | 2 |  |  | — |  |  | 1 |  |  | — |
Income available to Common Stockholders | $ | 3,383 |  |  | $ | 372 |  |  | $ | 201 |  |  | $ | 482 |
Weighted average number of common shares outstanding — basic | 251 |  |  | 254 |  |  | 265 |  |  | 278 |
(Loss)/income from discontinued operations per weighted average common share — basic | $ | (0.31) |  |  | $ | (0.01) |  |  | $ | 0.05 |  |  | $ | 1.39 |
Net Income per weighted average common share — basic | $ | 13.48 |  |  | $ | 1.46 |  |  | $ | 0.76 |  |  | $ | 1.73 |
Weighted average number of common shares outstanding — diluted | 253 |  |  | 256 |  |  | 267 |  |  | 280 |
(Loss)/income from discontinued operations per weighted average common share — diluted | $ | (0.31) |  |  | $ | (0.01) |  |  | $ | 0.05 |  |  | $ | 1.38 |
Net income per weighted average common share — diluted | $ | 13.37 |  |  | $ | 1.45 |  |  | $ | 0.75 |  |  | $ | 1.72 |
| Quarter Ended |  |  |  |  |  |
| 2018 |  |  |  |  |  |
(In millions, except per share data) | December 31 |  | September 30 |  | June 30 |  | March 31
Operating revenues | $ | 1,992 |  |  | $ | 2,960 |  |  | $ | 2,461 |  |  | $ | 2,065 |
Operating income | 49 |  |  | 398 |  |  | 174 |  |  | 361 |
Net (loss)/income from continuing operations | (93) |  |  | 287 |  |  | 27 |  |  | 238 |
Income/(loss) from discontinued operations | 80 |  |  | (336) |  |  | 69 |  |  | (5) |
Net (loss)/income | (13) |  |  | (49) |  |  | 96 |  |  | 233 |
Less: Net (loss)/income attributable to noncontrolling interests and redeemable noncontrolling interests | (2) |  |  | 23 |  |  | 24 |  |  | (46) |
(Loss)/income available to Common Stockholders | $ | (11) |  |  | $ | (72) |  |  | $ | 72 |  |  | $ | 279 |
Weighted average number of common shares outstanding — basic | 289 |  |  | 299 |  |  | 310 |  |  | 318 |
Income/(loss) from discontinued operations per weighted average common share — basic | $ | 0.28 |  |  | $ | (1.12) |  |  | $ | 0.22 |  |  | $ | (0.02) |
Net (loss)/income per weighted average common share — basic | $ | (0.04) |  |  | $ | (0.24) |  |  | $ | 0.23 |  |  | $ | 0.88 |
Weighted average number of common shares outstanding — diluted | 289 |  |  | 299 |  |  | 314 |  |  | 322 |
Income/(loss) from discontinued operations per weighted average common share — diluted | $ | 0.28 |  |  | $ | (1.12) |  |  | $ | 0.22 |  |  | $ | (0.02) |
Net (loss)/income per weighted average common share — diluted | $ | (0.04) |  |  | $ | (0.24) |  |  | $ | 0.23 |  |  | $ | 0.87 |

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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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