Accounting Policies - Restricted Cash (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Cash and Cash Equivalents	$ 1,049	$ 1,227	$ 1,248
Restricted Cash	63		79
Total Cash, Cash Equivalents and Restricted Cash	$ 1,112	$ 1,311	$ 1,327	$ 1,164