CONSOLIDATED STATEMENTS OF COMPREHENSIVE OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Income (Loss)	$ 58	$ 478	$ (1,324)
Related to marketable securities:
Marketable securities, net of tax	(76)	(27)	14
Related to employee benefit plans:
Employee benefit plans, net of tax	(67)	246	(29)
Related to interest rate derivative instruments:
Interest rate derivative instruments, net of tax	17	13	(14)
Other comprehensive income (loss)	(126)	232	(29)
Comprehensive income	$ (68)	$ 710	$ (1,353)