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Share-Based Compensation - Summary of Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Shares  
Stock options outstanding - balance at beginning of period (in shares) | shares 15,989
Granted (in shares) | shares 1,522
Forfeited (in shares) | shares (186)
Exercised (in shares) | shares (2,636)
Stock options outstanding - balance at end of period (in shares) | shares 14,689
Stock options exercisable (in shares) | shares 12,222
Weighted- Average Exercise Price  
Stock options outstanding - balance at beginning of period (in dollars per share) | $ / shares $ 42.83
Granted (in dollars per share) | $ / shares 112.65
Forfeited (in dollars per share) | $ / shares 93.66
Exercised (in dollars per share) | $ / shares 35.07
Stock options outstanding - balance at end of period (in dollars per share) | $ / shares 50.82
Stock options exercisable (in dollars per share) | $ / shares $ 41.14
Weighted- Average Remaining Contractual Term (Years)  
Stock options outstanding (in years) 4 years 7 months 6 days
Stock options exercisable (in years) 3 years 9 months 14 days
Aggregate Intrinsic Value (In millions)  
Stock options outstanding | $ $ 926
Stock options exercisable | $ $ 889