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Employee Stock and Savings Plans - Summary of Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Shares  
Stock options outstanding - balance at beginning of period (in shares) | shares 13,791
Granted (in shares) | shares 1,283
Forfeited (in shares) | shares (332)
Exercised (in shares) | shares (2,690)
Stock options outstanding - balance at end of period (in shares) | shares 12,052
Stock options exercisable (in shares) | shares 9,319
Weighted- Average Exercise Price  
Stock options outstanding - balance at beginning of period (in dollars per share) | $ / shares $ 28.17
Granted (in dollars per share) | $ / shares 70.11
Forfeited (in dollars per share) | $ / shares 57.65
Exercised (in dollars per share) | $ / shares 18.62
Stock options outstanding - balance at end of period (in dollars per share) | $ / shares 33.96
Stock options exercisable (in dollars per share) | $ / shares $ 26.20
Weighted-Average Remaining Contractual Term and Aggregate Intrinsic Value  
Weighted-Average Remaining Contractual Term, Stock options outstanding 5 years 2 months 12 days
Weighted-Average Remaining Contractual Term, Stock options exercisable 4 years 3 months 18 days
Aggregate Intrinsic Value, Stock options outstanding | $ $ 477
Aggregate Intrinsic Value, Stock options exercisable | $ $ 441