Earnings Per Share - Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic earnings per share:
Net income	$ 1,706,715	$ 709,067
Weighted-average common shares outstanding (in shares)	443,224	439,352
Basic earnings per share (in dollars per share)	$ 3.85	$ 1.61
Diluted earnings per share:
Net income	$ 1,706,715	$ 709,067
Shares used in computation:
Weighted-average common shares outstanding (in shares)	443,224	439,352
Employee stock options (in shares)	12,417	13,142
Weighted-average number of shares (in shares)	455,641	452,494
Diluted earnings per share (in dollars per share)	$ 3.75	$ 1.57