Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock, Common
Balance at Dec. 31, 2018	$ 19,364	$ 206	$ 5,659	$ (2)	$ 13,543	$ (42)
Net Income (Loss)	2,735	0	0	0	2,735	0
Common Stock Issued Under Stock Plans	0	0	0	0	0	0
Common Stock Dividends Declared	(629)	0	0	0	(629)	0
Other Comprehensive Income (Loss)	(3)	0	0	(3)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(8)	0	(11)	0	0	3
Restricted Stock and Restricted Stock Units, Net	0		(5)	0	0	5
Stock-Based Compensation Expenses	175	0	175	0	0	0
Treasury Stock Issued as Compensation	6	0	(1)	0	0	7
Balance at Dec. 31, 2019	$ 21,640	206	5,817	(5)	15,649	(27)
Common Stock Dividends Declared (in dollars per share)	$ 1.0825
Net Income (Loss)	$ (605)	0	0	0	(605)	0
Common Stock Issued Under Stock Plans	0	0	0	0	0	0
Common Stock Dividends Declared	(874)	0	0	0	(874)	0
Other Comprehensive Income (Loss)	(7)	0	0	(7)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	0	0	(9)	0	0	9
Restricted Stock and Restricted Stock Units, Net	0	0	(9)	0	0	9
Stock-Based Compensation Expenses	146	0	146	0	0	0
Treasury Stock Issued as Compensation	2	0	0	0	0	2
Balance at Dec. 31, 2020	$ 20,302	206	5,945	(12)	14,170	(7)
Common Stock Dividends Declared (in dollars per share)	$ 1.50
Net Income (Loss)	$ 4,664	0	0	0	4,664	0
Common Stock Issued Under Stock Plans	17	0	17	0	0	0
Common Stock Dividends Declared	(2,915)	0	0	0	(2,915)	0
Other Comprehensive Income (Loss)	0	0	0	0	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(40)	0	(22)	0	0	(18)
Restricted Stock and Restricted Stock Units, Net	0	0	(5)	0	0	5
Stock-Based Compensation Expenses	152	0	152	0	0	0
Treasury Stock Issued as Compensation	0	0	0	0	0	0
Balance at Dec. 31, 2021	$ 22,180	$ 206	$ 6,087	$ (12)	$ 15,919	$ (20)
Common Stock Dividends Declared (in dollars per share)	$ 4.9875