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Earnings Per Share Share Count Information (Details) - shares | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Earnings Per Share [Line Items] |  |  |  |
Weighted Average Common Shares - basic |  | 743,400,000 | 749,900,000 |
Dilutive effect of equity compensation plans | [1] | 6,200,000 | 2,600,000 |
Weighted Average Common Shares - diluted |  | 749,600,000 | 752,500,000 |
Potential shares of common stock excluded from EPS calculations | [2] | 2,900,000 | 9,100,000 |
Common Stock, Shares Authorized |  | 1,666,667,000 | 1,666,667,000 | 1,666,667,000
[1] | Diluted earnings per share considers the impact of potentially dilutive securities except in periods in which there is a loss because the inclusion of the potential common shares would have an anti-dilutive effect.
[2] | These outstanding potential shares of common stock relating to stock options, restricted stock units and performance-based restricted stock units were excluded from the calculation of diluted earnings per share because the effect of including them would have been anti-dilutive.

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1505-109256 + Details
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