Investments and Restricted Cash and Cash Equivalents and Investments - EGTS - Reconciliation of Cash (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
EGTS
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	46	16
Restricted cash and cash equivalents, current	29	29
Total cash and cash equivalents and restricted cash and cash equivalents	$ 75	$ 45	$ 30	$ 26