Consolidated Statements of Stockholders' Equity Statement - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2020	$ 20,302	$ 206	$ 5,945	$ (12)	$ 14,170	$ (7)
Net Income	677	0	0	0	677	0
Dividends, Common Stock	(241)	0	0	0	(241)	0
Other Comprehensive Loss	(2)	0	0	(2)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(9)	0	0	0	0	(9)
Restricted Stock and Restricted Stock Units, Net	0	0	(1)	0	0	1
Stock-Based Compensation Expenses	35	0	35	0	0	0
Treasury Stock Issued as Compensation	0	0	0	0	0	0
Balance at Mar. 31, 2021	20,762	206	5,979	(14)	14,606	(15)
Balance at Dec. 31, 2021	22,180	206	6,087	(12)	15,919	(20)
Net Income	390	0	0	0	390	0
Dividends, Common Stock	(1,026)	0	0	0	(1,026)	0
Other Comprehensive Loss	(1)	0	0	(1)	0	0
Common Stock Issued Under Stock Plans	0	0	0	0	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(38)	0	(24)	0	0	(14)
Restricted Stock and Restricted Stock Units, Net	0	0	(3)	0	0	3
Stock-Based Compensation Expenses	35	0	35	0	0	0
Treasury Stock Issued as Compensation	0	0	0	0	0	0
Balance at Mar. 31, 2022	$ 21,540	$ 206	$ 6,095	$ (13)	$ 15,283	$ (31)