Cash and Cash Equivalents and Restricted Cash and Cash Equivalents - NPC (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
Total cash and cash equivalents and restricted cash and cash equivalents	1,155	1,817	$ 1,582	$ 1,244
NPC
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	23	43
Restricted cash and cash equivalents, current	19	17
Total cash and cash equivalents and restricted cash and cash equivalents	$ 42	$ 60	$ 61	$ 45