CONSOLIDATED STATEMENTS OF COMPREHENSIVE OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Income	$ 235	$ 58	$ 478
Related to marketable securities:
Marketable securities, net of tax	46	(76)	(27)
Related to employee benefit plans:
Employee benefit plans, net of tax	48	(67)	246
Related to interest rate derivative instruments:
Interest rate derivative instruments, net of tax	(5)	17	13
Other comprehensive income (loss)	89	(126)	232
Comprehensive income	$ 324	$ (68)	$ 710