Supplemental Cash Flow Statement Disclosures (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Cash, Cash Equivalents and Restricted Cash
Cash and cash equivalents	$ 1,719	$ 572	$ 695	$ 548
Current restricted cash (included in other current assets)	$ 6	$ 22	15	10
Location of current restricted cash	Other current assets	Other current assets
Cash, cash equivalents and restricted cash - beginning of period	$ 1,725	$ 594	710	558
Other Non-cash items
Noncash capital expenditures	168	321	$ 204	$ 392
Selling, general and administrative
Cash, Cash Equivalents and Restricted Cash
Corporate interest income	$ 26	$ 4