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Stock-Based Compensation Plans - Summary of Stock Options Activity (Details) - Amended and Restated 2004 Stock Incentive Plan
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Shares Subject to Options  
Outstanding as of beginning of the period (in shares) | shares 3,185
Granted (in shares) | shares 0
Exercised (in shares) | shares (1,392)
Forfeited (in shares) | shares 0
Expired (in shares) | shares 0
Outstanding as of end of the period (in shares) | shares 1,793
Weighted- Average Exercise Price  
Outstanding as of beginning of the period (in dollars per share) | $ / shares $ 55.54
Granted (in dollars per share) | $ / shares 0.00
Exercised (in dollars per share) | $ / shares 44.76
Forfeited (in dollars per share) | $ / shares 0.00
Expired (in dollars per share) | $ / shares 0.00
Outstanding as of end of the period (in dollars per share) | $ / shares $ 63.91
Weighted-Average Remaining Contractual Term, Outstanding at end of period, years 3 years 3 months 7 days
Aggregate Intrinsic Value, Outstanding, at end of period | $ $ 63