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Earnings Per Share | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Earnings Per Share | 8. Earnings Per Share The following table provides a reconciliation between basic and diluted earnings per share:
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
Millions, Except Per Share Amounts | 2020 | 2019 |  | 2020 | 2019
Net income | $ | 1,363 | $ | 1,555 |  | $ | 3,969 | $ | 4,516
Weighted-average number of shares outstanding: |  |  |  |  |  |  |  |  |
Basic |  | 675.0 |  | 699.3 |  |  | 679.0 |  | 707.2
Dilutive effect of stock options |  | 0.9 |  | 1.2 |  |  | 0.8 |  | 1.3
Dilutive effect of retention shares and units |  | 0.9 |  | 1.4 |  |  | 0.9 |  | 1.3
Diluted |  | 676.8 |  | 701.9 |  |  | 680.7 |  | 709.8
Earnings per share – basic | $ | 2.02 | $ | 2.22 |  | $ | 5.85 | $ | 6.39
Earnings per share – diluted | $ | 2.01 | $ | 2.22 |  | $ | 5.83 | $ | 6.36
Stock options excluded as their inclusion would be anti-dilutive |  | 0.5 |  | 0.6 |  |  | 0.7 |  | 0.5

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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