ACCOUNTS RECEIVABLE AND OTHER FINANCIAL ASSETS - Summary of the Activity of the Allowance for Expected Credit Losses on Accounts Receivable (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of year	$ 166	$ 49
Provision charged to earnings	11	241
Write-offs and adjustments	(82)	(11)
Foreign currency translation adjustments	(3)	3
Balance, end of period	$ 92	$ 282