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Earnings Per Share - Calculation of EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic earnings per share:        
Net income $ 1,353,013 $ 720,196 $ 3,059,728 $ 1,429,263
Weighted-average shares of common stock outstanding (in shares) 443,159 440,569 443,192 439,961
Basic earnings per share (in dollars per share) $ 3.05 $ 1.63 $ 6.90 $ 3.25
Diluted earnings per share:        
Net income $ 1,353,013 $ 720,196 $ 3,059,728 $ 1,429,263
Shares used in computation:        
Weighted-average shares of common stock outstanding (in shares) 443,159 440,569 443,192 439,961
Employee stock options (in shares) 11,970 13,376 12,193 13,259
Weighted-average number of shares (in shares) 455,129 453,945 455,385 453,220
Diluted earnings per share (in dollars per share) $ 2.97 $ 1.59 $ 6.72 $ 3.15