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Net Income (Loss) Per Share | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Net Income (Loss) Per Share | Net Income (Loss) Per Share The following table sets forth the computation of Net Income (Loss) Per Share for the three-month and six-month periods ended June 30, 2021 and 2020 (in millions, except per share data):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Numerator for Basic and Diluted Earnings Per Share - |  |  |  |  |  |  |
Net Income (Loss) | $ | 907 |  |  | $ | (910) |  |  | $ | 1,584 |  |  | $ | (900) |
Denominator for Basic Earnings Per Share - |  |  |  |  |  |  |
Weighted Average Shares | 580 |  |  | 579 |  |  | 580 |  |  | 579 |
Potential Dilutive Common Shares - |  |  |  |  |  |  |
Stock Options/SARs/ESPP | 1 |  |  | — |  |  | 1 |  |  | — |
Restricted Stock/Units and Performance Units | 3 |  |  | — |  |  | 2 |  |  | — |
Denominator for Diluted Earnings Per Share - |  |  |  |  |  |  |
Adjusted Diluted Weighted Average Shares | 584 |  |  | 579 |  |  | 583 |  |  | 579 |
Net Income (Loss) Per Share |  |  |  |  |  |  |
Basic | $ | 1.56 |  |  | $ | (1.57) |  |  | $ | 2.73 |  |  | $ | (1.55) |
Diluted | $ | 1.55 |  |  | $ | (1.57) |  |  | $ | 2.72 |  |  | $ | (1.55) |
The diluted earnings per share calculation excludes stock option, SAR, restricted stock, restricted stock unit, performance unit and ESPP grants that were anti-dilutive. Shares underlying the excluded stock option, SAR and ESPP grants were 5 million and 9 million shares for the three months ended June 30, 2021 and 2020, respectively, and were 7 million and 9 million shares for the six months ended June 30, 2021 and 2020, respectively. For the three and six months ended June 30, 2020, 5 million shares underlying grants of restricted stock, restricted stock units and performance units were excluded.

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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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