Summary of Significant Accounting Policies - Schedule of Cash and Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Cash and cash equivalents	$ 18,324	$ 17,576	$ 16,229	$ 19,384
Restricted cash included in prepaid expenses and other current assets	294	345	326	238
Restricted cash included in other non-current assets	269	223	270	279
Total as presented in the consolidated statements of cash flows	$ 18,887	$ 18,144	$ 16,825	$ 19,901