REVENUE RECOGNITION - Reconciliation of Contract Balances (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Dec. 31, 2021
Reconciliation of Contract Balances
Accounts receivable (net of allowances of $44 in 2022 and $44 in 2021)		$ 2,271	$ 2,279
Contract assets	[1]	41	62
Deferred income (current)		882	872
Deferred income (noncurrent)		452	$ 475
Revenue recognized that was included in deferred income at the beginning of the period		$ 225

[1] Included within prepaid expenses and other current assets in the Consolidated Balance Sheet.