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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.