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Share-Based Compensation - Summary of Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Shares  
Stock options outstanding - balance at beginning of period (in shares) | shares 15,989
Granted (in shares) | shares 1,503
Forfeited (in shares) | shares (158)
Exercised (in shares) | shares (2,195)
Stock options outstanding - balance at end of period (in shares) | shares 15,139
Stock options exercisable (in shares) | shares 12,438
Weighted-Average Exercise Price  
Stock options outstanding - balance at beginning of period (in dollars per shares) | $ / shares $ 42.83
Granted (in dollars per share) | $ / shares 112.87
Forfeited (in dollars per share) | $ / shares 92.47
Exercised (in dollars per share) | $ / shares 34.31
Stock options outstanding - balance at end of period (in dollars per shares) | $ / shares 50.51
Stock options exercisable (in dollars per share) | $ / shares $ 40.82
Weighted-Average Remaining Contractual Term (Years)  
Stock options outstanding - September 30, 2020 4 years 9 months 25 days
Stock options exercisable - September 30, 2020 4 years
Aggregate Intrinsic Value (In millions)  
Stock options outstanding - September 30, 2020 | $ $ 810
Stock options exercisable - September 30, 2020 | $ $ 774