Supplemental Cash Flow Statement Disclosures (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Cash, Cash Equivalents and Restricted Cash
Cash and cash equivalents	$ 1,335	$ 473	$ 548	$ 563
Current restricted cash (included in other current assets)	$ 14	$ 23	10	16
Location of current restricted cash	Other current assets	Other current assets
Total cash, cash equivalents and restricted cash	$ 1,349	$ 496	558	579
Other Non-cash items
PP&E acquired but not yet paid	$ 207	$ 461	$ 392	$ 540