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Earnings Per Share Share Count Information (Details) - shares | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Earnings Per Share [Line Items] |  |  |  |  |  |
Weighted Average Common Shares - basic |  | 737,300,000 | 749,200,000 | 740,300,000 | 749,600,000 |
Dilutive effect of equity compensation plans | [1] | 6,000,000.0 | 2,400,000 | 6,100,000 | 2,400,000 |
Weighted Average Common Shares - diluted |  | 743,300,000 | 751,600,000 | 746,400,000 | 752,000,000.0 |
Potential shares of common stock excluded from EPS calculations | [2] | 2,100,000 | 11,900,000 | 2,100,000 | 11,000,000.0 |
Common Stock, Shares Authorized |  | 1,666,667,000 | 1,666,667,000 | 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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