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Share-Based Compensation - Summary of Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 6 Months Ended
Jun. 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 (103)
Exercised (in shares) | shares (1,836)
Stock options outstanding - balance at end of period (in shares) | shares 15,553
Stock options exercisable (in shares) | shares 12,771
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 87.97
Exercised (in dollars per share) | $ / shares 33.39
Stock options outstanding - balance at end of period (in dollars per shares) | $ / shares 50.42
Stock options exercisable (in dollars per share) | $ / shares $ 40.69
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted average remaining contractual term, stock options outstanding 5 years 25 days
Weighted average remaining contractual term, stock options exercisable 4 years 2 months 26 days
Aggregate intrinsic value, stock options outstanding | $ $ 757
Aggregate intrinsic value, stock options exercisable | $ $ 727