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Earnings Per Share | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The following table sets forth the calculation of basic and diluted earnings per share:
| Basic |  | Diluted
| First Quarter
| 2021 |  | 2020 |  | 2021 |  | 2020
| ($ in millions, except per share amounts, shares in millions)
Net income | $ | 673 |  |  | $ | 381 |  |  | $ | 673 |  |  | $ | 381 |
Dividend equivalent payments | (1) |  |  | (1) |  |  | — |  |  | (1) |
Income available to common stockholders | $ | 672 |  |  | $ | 380 |  |  | $ | 673 |  |  | $ | 380 |
Weighted-average shares outstanding | 251.4 |  |  | 257.3 |  |  | 251.4 |  |  | 257.3 |
Dilutive effect of outstanding options and share-settled awards |  |  |  |  | 1.2 |  |  | 1.4 |
Adjusted weighted-average shares outstanding |  |  |  |  | 252.6 |  |  | 258.7 |
Earnings per share | $ | 2.67 |  |  | $ | 1.48 |  |  | $ | 2.66 |  |  | $ | 1.47 |
During the first quarters of 2021 and 2020, dividend equivalent payments were made to holders of stock options and RSUs. For purposes of computing basic earnings per share, dividend equivalent payments made to holders of stock options and RSUs were deducted from net income to determine income available to common stockholders. For purposes of computing diluted earnings per share, we evaluate on a grant-by-grant basis those stock options and RSUs receiving dividend equivalent payments under the two-class and treasury stock methods to determine which method is more dilutive for each grant. For those grants for which the two-class method was more dilutive, net income was reduced by dividend equivalent payments to determine income available to common stockholders. There are no options excluded from the dilution calculations due to exercise prices exceeding the average market price of Common Stock for the first quarters ended March 31, 2021 and 2020.

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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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