VALUATION AND QUALIFYING ACCOUNTS (Schedule of Valuation and Qualifying Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable - Allowance for Doubtful Receivables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 45	$ 42	$ 59
Additions charged to expenses	22	24	10
Additions charged to other accounts	0	0	4
Deductions from reserves	(16)	(21)	(31)
Balance at end of year	51	45	42
Accounts Receivable - Allowance for Doubtful Receivables | Sadara Chemical Company
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Additions charged to expenses	2
Inventory - Obsolescence Reserve
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	35	23	18
Additions charged to expenses	2	19	7
Deductions from reserves	(14)	(7)	(2)
Balance at end of year	23	35	23
Reserves for Other Investments and Noncurrent Receivables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	2,215	460	430
Additions charged to expenses	7	1,758	44
Deductions from reserves	(129)	(3)	(14)
Balance at end of year	2,093	2,215	460
Reserves for Other Investments and Noncurrent Receivables | Sadara Chemical Company
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Additions charged to expenses	1,753
Deferred Tax Assets - Valuation Allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	1,262	1,225	1,255
Additions charged to expenses	313	140	152
Deductions from reserves	(273)	(103)	(182)
Balance at end of year	$ 1,302	$ 1,262	$ 1,225