SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Contract assets	$ 195	$ 134
Contract liabilities	246	66
Other non-current assets
Summary Of Significant Accounting Policies [Line Items]
Contract assets	111	64
Accrued expenses and other current liabilities
Summary Of Significant Accounting Policies [Line Items]
Contract liabilities	162	32
Other non-current liabilities
Summary Of Significant Accounting Policies [Line Items]
Contract liabilities	$ 84	$ 34