CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Common Stock Held In Treasury
Beginning balance at Dec. 31, 2020	$ 20,302	$ 206	$ 5,945	$ (12)	$ 14,170	$ (7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	2,679				2,679
Common stock dividends declared	(1,307)				(1,307)
Other Comprehensive Income (Loss)	(1)			(1)
Common Stock Issued Under Stock Plans	9		9
Change in Treasury Stock - Stock Compensation Plans, Net	(34)		(7)			(27)
Restricted Stock and Restricted Stock Units, Net	0		(6)			6
Stock-Based Compensation Expenses	117		117
Treasury Stock Issued as Compensation	0
Ending balance at Sep. 30, 2021	21,765	206	6,058	(13)	15,542	(28)
Beginning balance at Jun. 30, 2021	20,881	206	6,017	(15)	14,689	(16)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,095				1,095
Common stock dividends declared	(242)				(242)
Other Comprehensive Income (Loss)	2			2
Common Stock Issued Under Stock Plans	0		0
Change in Treasury Stock - Stock Compensation Plans, Net	(22)		(5)			(17)
Restricted Stock and Restricted Stock Units, Net	0		(5)			5
Stock-Based Compensation Expenses	51		51
Treasury Stock Issued as Compensation	0
Ending balance at Sep. 30, 2021	21,765	206	6,058	(13)	15,542	(28)
Beginning balance at Dec. 31, 2021	22,180	206	6,087	(12)	15,919	(20)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	5,482				5,482
Common stock dividends declared	(3,838)				(3,838)
Other Comprehensive Income (Loss)	6			6
Common Stock Issued Under Stock Plans	13		13
Change in Treasury Stock - Stock Compensation Plans, Net	(93)		(40)			(53)
Restricted Stock and Restricted Stock Units, Net	0		(4)			4
Stock-Based Compensation Expenses	99		99
Treasury Stock Issued as Compensation	0
Ending balance at Sep. 30, 2022	23,849	206	6,155	(6)	17,563	(69)
Beginning balance at Jun. 30, 2022	22,312	206	6,128	(12)	16,028	(38)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	2,854				2,854
Common stock dividends declared	(1,319)				(1,319)
Other Comprehensive Income (Loss)	6			6
Common Stock Issued Under Stock Plans	0		0
Change in Treasury Stock - Stock Compensation Plans, Net	(38)		(5)			(33)
Restricted Stock and Restricted Stock Units, Net	0		(2)			2
Stock-Based Compensation Expenses	34		34
Treasury Stock Issued as Compensation	0
Ending balance at Sep. 30, 2022	$ 23,849	$ 206	$ 6,155	$ (6)	$ 17,563	$ (69)