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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Shares Used in the Earnings Per Share Calculations The number of shares used in the earnings per share calculations are reconciled as follows:
For the three months ended June 30For the six months ended June 30
(in millions)2021202020212020
Weighted-average basic shares outstanding666.7 678.2 666.6 680.8 
Dilutive effect of stock options3.2 2.3 3.2 2.3 
Weighted-average diluted shares outstanding669.9 680.5 669.8 683.1