Other Expense - Schedule of Components of Other Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Other Income and Expenses [Abstract]
Unoccupied facilities expense (a)	$ 8	$ 8	$ 25	$ 27
Impairment of long-lived assets	0	0		0
Idle equipment charges (c)	1	5	3	19
Loss on early extinguishment of debt	0	0	0	47
South Texas deficiency fee obligation, net (d)	0	(1)	0	(18)
Other	16	24	43	43
Total other expense	$ 25	$ 36	$ 93	$ 118