Consolidated Statements of Stockholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Balance	$ 16,283,273	$ 205,788	$ 5,536,547	$ (19,297)	$ 10,593,533	$ (33,298)
Net Income	2,526,272	0	0	0	2,526,272	0
Common Stock Issued Under Stock Plans	0	7	(7)	0	0	0
Dividends, Common Stock	(341,701)	0	0	0	(341,701)	0
Other Comprehensive Loss	(161)	0	0	(161)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(46,460)	0	(23,458)	0	0	(23,002)
Restricted Stock and Restricted Stock Units, Net	0	8	(3,421)	0	0	3,413
Stock-Based Compensation Expenses	116,290	0	116,290	0	0	0
Treasury Stock Issued as Compensation	957	0	308	0	0	649
Balance	17,452,394	205,796	5,591,643	(17,512)	11,714,656	(42,189)
Net Income	1,190,952	0	0	0	1,190,952	0
Common Stock Issued Under Stock Plans	0	2	(2)	0	0	0
Dividends, Common Stock	(127,504)	0	0	0	(127,504)	0
Other Comprehensive Loss	(1,946)	0	0	(1,946)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(25,584)	0	(7,034)	0	0	(18,550)
Restricted Stock and Restricted Stock Units, Net	0	5	(7,548)	0	0	7,543
Stock-Based Compensation Expenses	49,001	0	49,001	0	0	0
Treasury Stock Issued as Compensation	1,157	0	199	0	0	958
Balance	18,538,470	205,803	5,626,259	(19,458)	12,778,104	(52,238)
Cumulative Effect of Adoption of ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220)	18,538,470	205,803	5,626,259	(19,458)	12,778,104	(52,238)
Balance	19,364,188	205,804	5,658,794	(1,358)	13,543,130	(42,182)
Net Income	2,098,389	0	0	0	2,098,389	0
Common Stock Issued Under Stock Plans	0	0	0	0	0	0
Dividends, Common Stock	(461,871)	0	0	0	(461,871)	0
Other Comprehensive Loss	(2,598)	0	0	(2,598)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(12,576)	0	(19,295)	0	0	6,719
Restricted Stock and Restricted Stock Units, Net	0	17	(1,886)	0	0	1,869
Stock-Based Compensation Expenses	132,323	0	132,323	0	0
Treasury Stock Issued as Compensation	6,425	0	(863)	0	0	7,288
Balance	20,630,276	205,809	5,729,318	(4,528)	14,731,609	(31,932)
Net Income	615,122	0	0	0	615,122	0
Common Stock Issued Under Stock Plans	0	0	0	0	0	0
Dividends, Common Stock	(167,350)	0	0	0	(167,350)	0
Other Comprehensive Loss	839	0	0	839	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(12,979)	0	(12,220)	0	0	(759)
Restricted Stock and Restricted Stock Units, Net	0	12	(2,270)	0	0	2,258
Stock-Based Compensation Expenses	54,670	0	54,670	0	0	0
Treasury Stock Issued as Compensation	3,702	0	(425)	0	0	4,127
Balance	21,124,280	205,821	5,769,073	(3,689)	15,179,381	(26,306)
Cumulative Effect of Adoption of ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220)	$ 0	$ 0	$ 0	$ 267	$ (267)	$ 0