CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of cash, cash equivalents and restricted cash and cash equivalents at end of period:
Cash and cash equivalents	$ 458	$ 351	$ 118
Restricted cash and cash equivalents included in other current assets	$ 10	$ 25	$ 7
Restricted Cash and Cash Equivalents, Current, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current	Other Assets, Current	Other Assets, Current
Restricted cash and cash equivalents included in restricted funds	$ 84	$ 69	$ 69
Restricted Cash and Cash Equivalents, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Restricted Cash and Investments, Noncurrent	Restricted Cash and Investments, Noncurrent	Restricted Cash and Investments, Noncurrent
Cash, cash equivalents and restricted cash and cash equivalents at end of period	$ 552	$ 445	$ 194