Accounting Policies - Restricted Cash (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Cash and Cash Equivalents (Note 1)	$ 902	$ 1,227	$ 1,088
Restricted Cash	83	84	76
Total Cash, Cash Equivalents and Restricted Cash	$ 985	$ 1,311	$ 1,164	$ 1,624