CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE OPERATIONS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 139	$ 397	$ (4)	$ 266
Related to marketable securities:
Total	(20)	(1)	(60)	(13)
Related to employee benefit plans:
Total	0	7	1	13
Related to interest rate derivative instruments:
Total	4	1	13	7
Comprehensive Income (Loss)	123	404	(50)	273
Other Comprehensive Income (Loss), Net of Tax	$ (16)	$ 7	$ (46)	$ 7