Significant Accounting Policies - Cash and Cash Equivalents, Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Cash and cash equivalents	$ 8,196	$ 12,945	$ 9,408
Restricted cash (included in other current assets)	90	144	3,065
Restricted cash (included in other assets)	239	216	218
Total cash, cash equivalents and restricted cash in the consolidated statements of cash flows	$ 8,525	$ 13,305	$ 12,691	$ 11,043