Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss)	Retained Earnings [Member]	Treasury Stock, Common [Member]	Common Shares, Treasury [Member]
Balance at Dec. 31, 2017	$ 16,283,273	$ 205,788	$ 5,536,547	$ (19,297)	$ 10,593,533	$ (33,298)
Net Income (Loss)	3,419,040	0	0	0	3,419,040	0
Common Stock Issued Under Stock Plans	5,620	8	5,612	0	0	0
Common Stock Dividends Declared	(469,443)	0	0	0	(469,443)	0
Other Comprehensive Income (Loss)	17,939	0	0	17,939	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(48,454)	0	(35,118)	0	0	(13,336)
Restricted Stock and Restricted Stock Units, Net	0	8	(3,891)	0	0	3,883
Stock-Based Compensation Expenses	155,337	0	155,337	0	0	0
Treasury Stock Issued as Compensation	876	0	307	0	0	569
Balance at Dec. 31, 2018	$ 19,364,188	205,804	5,658,794	(1,358)	13,543,130	(42,182)
Common Stock Dividends Declared (in dollars per share)	$ 0.81
Net Income (Loss)	$ 2,734,910	0	0	0	2,734,910	0
Common Stock Issued Under Stock Plans	(8)	1	(9)	0	0	0
Common Stock Dividends Declared	(629,169)	0	0	0	(629,169)	0
Other Comprehensive Income (Loss)	(3,561)	0	0	(3,561)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(6,853)	0	(10,637)	0	0	3,784
Restricted Stock and Restricted Stock Units, Net	0	17	(4,566)	0	0	4,549
Stock-Based Compensation Expenses	174,738	0	174,738	0	0	0
Treasury Stock Issued as Compensation	6,471	0	(845)	0	0	7,316
Cumulative Effect of Account Changes	0	0	0	267	(267)		$ 0
Balance at Dec. 31, 2019	$ 21,640,716	205,822	5,817,475	(4,652)	15,648,604	(26,533)
Common Stock Dividends Declared (in dollars per share)	$ 1.0825
Net Income (Loss)	$ (604,572)	0	0	0	(604,572)	0
Common Stock Issued Under Stock Plans	0	0	0	0	0	0
Common Stock Dividends Declared	(874,063)	0	0	0	(874,063)	0
Other Comprehensive Income (Loss)	(7,676)	0	0	(7,676)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(63)	0	(9,152)	0	0	9,089
Restricted Stock and Restricted Stock Units, Net	0	15	(9,310)	0	0	9,295
Stock-Based Compensation Expenses	146,396	0	146,396	0	0	0
Treasury Stock Issued as Compensation	1,149	0	(385)	0	0	1,534
Cumulative Effect of Account Changes	267
Balance at Dec. 31, 2020	$ 20,301,887	$ 205,837	$ 5,945,024	$ (12,328)	$ 14,169,969	$ (6,615)
Common Stock Dividends Declared (in dollars per share)	$ 1.50