Cash and Cash Equivalents and Restricted Cash and Cash Equivalents - PAC (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 963	$ 1,591
Restricted cash and cash equivalents, current	133	173
Restricted cash, cash equivalents and investments, noncurrent	59	53
Total cash and cash equivalents and restricted cash and cash equivalents	1,155	1,817	$ 1,582	$ 1,244
PAC
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	19	641
Restricted cash and cash equivalents, current	8	7
Restricted cash, cash equivalents and investments, noncurrent	31	26
Total cash and cash equivalents and restricted cash and cash equivalents	$ 58	$ 674	$ 341	$ 186