INCOME TAXES - Income tax reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income taxes at U.S. statutory rate of 21% for 2020, 2019 and 2018	$ 203	$ 266	$ 251
Net tax on remittance of foreign earnings	93	22	(22)
Valuation allowance adjustments	53	(2)	(11)
Reserve adjustments, settlements and claims	45	46	32
Foreign rate differentials	21	35	28
State taxes, net of federal benefit	12	3	6
U.S. tax on non-U.S. earnings	11	15	37
Other foreign taxes	9	10	8
Non-deductible transaction costs	8	3	3
Impact of transactions	3	124	(1)
Impact of foreign derived intangible income	(1)	(1)	(15)
Affiliates' earnings	(4)	(7)	(10)
Tax credits	(12)	(17)	(26)
Changes in accounting methods and filing positions	(18)	(7)	(30)
Tax holidays	(36)	(26)	(28)
Revaluation of U.S. deferred taxes	0	0	(4)
Other	10	4	(7)
Provision for income taxes	$ 397	$ 468	$ 211