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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data |
| Three Months Ended
| March 31 |  | June 30 |  | September 30 |  | December 31
| ($ in millions, except per share amounts)
2020 |  |  |  |  |  |  |
Railway operating revenues | $ | 2,625 |  |  | $ | 2,085 |  |  | $ | 2,506 |  |  | $ | 2,573 |
Income from railway operations | 568 |  |  | 610 |  |  | 840 |  |  | 984 |
Net income | 381 |  |  | 392 |  |  | 569 |  |  | 671 |
Earnings per share: |  |  |  |  |  |  |
Basic | 1.48 |  |  | 1.53 |  |  | 2.23 |  |  | 2.65 |
Diluted | 1.47 |  |  | 1.53 |  |  | 2.22 |  |  | 2.64 |
2019 |  |  |  |  |  |  |
Railway operating revenues | $ | 2,840 |  |  | $ | 2,925 |  |  | $ | 2,841 |  |  | $ | 2,690 |
Income from railway operations | 966 |  |  | 1,065 |  |  | 996 |  |  | 962 |
Net income | 677 |  |  | 722 |  |  | 657 |  |  | 666 |
Earnings per share: |  |  |  |  |  |  |
Basic | 2.53 |  |  | 2.72 |  |  | 2.50 |  |  | 2.56 |
Diluted | 2.51 |  |  | 2.70 |  |  | 2.49 |  |  | 2.55 |

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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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