Earnings Per Share - Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Basic earnings per share:
Net income	$ 709,067	$ 344,052
Weighted-average common shares outstanding (in shares)	439,352	436,947
Basic earnings per share (in dollars per share)	$ 1.61	$ 0.79
Diluted earnings per share:
Net income	$ 709,067	$ 344,052
Shares used in computation:
Weighted-average common shares outstanding (in shares)	439,352	436,947
Employee stock options (in shares)	13,142	14,975
Weighted-average number of shares (in shares)	452,494	451,922
Diluted earnings per share (in dollars per share)	$ 1.57	$ 0.76