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Earnings Per Share (Tables)
 9 Months Ended
Sep. 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 September 30For the nine months ended September 30
(in millions)2021202020212020
Weighted-average basic shares outstanding666.9 676.2 666.7 679.3 
Dilutive effect of stock options2.9 2.8 3.1 2.5 
Weighted-average diluted shares outstanding669.8 679.0 669.8 681.8