ACCOUNTS RECEIVABLE AND OTHER FINANCIAL ASSETS - Summary of the Activity of the Allowance for Expected Credit Losses on Accounts Receivable (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of year	$ 166	$ 49
Provision charged to earnings	44	206
Write-offs and adjustments	(96)	(59)
Foreign currency translation adjustments	(4)	12
Balance, end of period	$ 110	$ 208