Earnings Per Share Share Count Information (Details) - shares		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Earnings Per Share [Line Items]
Weighted Average Common Shares - basic		733,800,000	749,500,000	738,100,000	749,500,000
Dilutive effect of equity compensation plans	[1]	5,700,000	0	5,900,000	2,500,000
Weighted Average Common Shares - diluted		739,500,000	749,500,000	744,000,000.0	752,000,000.0
Potential shares of common stock excluded from EPS calculations	[2]	3,000,000.0	14,600,000	3,100,000	9,700,000
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.