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Share-Based Compensation - Summary of Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Shares  
Stock options outstanding - balance at beginning of period (in shares) | shares 14,689
Granted (in shares) | shares 4
Forfeited (in shares) | shares (18)
Exercised (in shares) | shares (1,598)
Stock options outstanding - balance at end of period (in shares) | shares 13,077
Stock options exercisable (in shares) | shares 11,578
Weighted-Average Exercise Price  
Stock options outstanding - balance at beginning of period (in dollars per shares) | $ / shares $ 50.82
Granted (in dollars per share) | $ / shares 102.69
Forfeited (in dollars per share) | $ / shares 104.04
Exercised (in dollars per share) | $ / shares 34.37
Stock options outstanding - balance at end of period (in dollars per shares) | $ / shares 52.77
Stock options exercisable (in dollars per share) | $ / shares $ 46.08
Weighted-Average Remaining Contractual Term (Years)  
Stock options outstanding (in years) 4 years 6 months 25 days
Stock options exercisable (in years) 4 years 14 days
Aggregate Intrinsic Value (In millions)  
Stock options outstanding | $ $ 867
Stock options exercisable | $ $ 845