Earnings Per Share - Schedule of Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net income	$ 653,138	$ 602,753
Basic weighted-average common shares outstanding (in shares)	259,369	259,815
Effect of potentially dilutive securities:
Employee stock purchase program (in shares)	8	31
Diluted weighted-average common shares outstanding (in shares)	261,916	263,515
Basic net income per common share (in dollars per share)	$ 2.52	$ 2.32
Diluted net income per common share (in dollars per share)	$ 2.49	$ 2.29
Stock options
Effect of potentially dilutive securities:
Share-based payment arrangements (in shares)	1,263	1,868
Restricted stock units (including PSUs)
Effect of potentially dilutive securities:
Share-based payment arrangements (in shares)	1,276	1,801