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	1,335,320	0	0	0	1,335,320	0
Common Stock Issued Under Stock Plans	3,628	5	3,623	0	0	0
Dividends, Common Stock	(214,197)	0	0	0	(214,197)	0
Other Comprehensive Loss	1,785	0	0	1,785	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(24,504)	0	(20,052)	0	0	(4,452)
Restricted Stock and Restricted Stock Units, Net	0	3	4,127	0	0	(4,130)
Stock-Based Compensation Expenses	67,289	0	67,289	0	0	0
Treasury Stock Issued as Compensation	(200)	0	109	0	0	(309)
Balance	16,840,639	205,793	5,569,194	(14,289)	11,125,051	(45,110)
Net Income	696,731	0	0	0	696,731	0
Common Stock Issued Under Stock Plans	2,174	3	2,171	0	0	0
Dividends, Common Stock	(107,126)	0	0	0	(107,126)	0
Other Comprehensive Loss	(3,223)	0	0	(3,223)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(7,729)	0	(12,446)	0	0	4,717
Restricted Stock and Restricted Stock Units, Net	0	0	918	0	0	(918)
Stock-Based Compensation Expenses	31,804	0	31,804	0	0	0
Treasury Stock Issued as Compensation	(876)	0	2	0	0	(878)
Balance	17,452,394	205,796	5,591,643	(17,512)	11,714,656	(42,189)
Cumulative Effect of Adoption of ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220)	17,452,394	205,796	5,591,643	(17,512)	11,714,656	(42,189)
Balance	19,364,188	205,804	5,658,794	(1,358)	13,543,130	(42,182)
Net Income	1,483,267	0	0	0	1,483,267	0
Common Stock Issued Under Stock Plans	0	0	0	0	0	0
Dividends, Common Stock	(294,521)	0	0	0	(294,521)	0
Other Comprehensive Loss	(3,437)	0	0	(3,437)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	404	0	(7,074)	0	0	7,478
Restricted Stock and Restricted Stock Units, Net	0	5	384	0	0	(389)
Stock-Based Compensation Expenses	77,653	0	77,653	0	0	0
Treasury Stock Issued as Compensation	2,722	0	(439)	0	0	3,161
Balance	19,903,797	205,807	5,695,197	(2,869)	14,050,676	(45,014)
Net Income	847,841	0	0	0	847,841	0
Common Stock Issued Under Stock Plans	0	0	0	0	0	0
Dividends, Common Stock	(166,908)	0	0	0	(166,908)	0
Other Comprehensive Loss	(1,659)	0	0	(1,659)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	6,193	0	(5,834)	0	0	12,027
Restricted Stock and Restricted Stock Units, Net	0	2	1,788	0	0	(1,790)
Stock-Based Compensation Expenses	38,566	0	38,566	0	0	0
Treasury Stock Issued as Compensation	2,446	0	(399)	0	0	2,845
Balance	20,630,276	205,809	5,729,318	(4,528)	14,731,609	(31,932)
Cumulative Effect of Adoption of ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220)	$ 0	$ 0	$ 0	$ 267	$ (267)	$ 0