CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 43	$ 36
PP&E, accumulated depreciation	$ 8,125	$ 7,617
Common stock, share issued (in shares)	1	1
Common stock, share outstanding (in shares)	1	1