SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Cash and Cash Equivalents (Details) - Fair Value, Recurring - Fair Value, Inputs, Level 1 - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Cash and Cash Equivalents [Line Items]
Total cash and cash equivalents	$ 14,923	$ 18,133
Cash
Cash and Cash Equivalents [Line Items]
Total cash and cash equivalents	2,656	5,438
Money market funds
Cash and Cash Equivalents [Line Items]
Total cash and cash equivalents	10,655	11,827
Certificates of deposit
Cash and Cash Equivalents [Line Items]
Total cash and cash equivalents	461	450
Commercial papers
Cash and Cash Equivalents [Line Items]
Total cash and cash equivalents	651	268
US Treasury Securities
Cash and Cash Equivalents [Line Items]
Total cash and cash equivalents	$ 500	$ 150