Overview & Summary of Significant Accounting Policies - Schedule of Cash and Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Cash and cash equivalents	$ 18,111	$ 16,398	$ 15,932	$ 16,253
Restricted cash included in prepaid expenses and other current assets	483	543	453	294
Restricted cash included in other non-current assets	380	248	205	377
Total as presented in the consolidated statements of cash flows	$ 18,974	$ 17,189	$ 16,590	$ 16,924