NONCONSOLIDATED AFFILIATES (Summarized Financial Information) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Percent of principal nonconsolidated entities financial information which is presented									100.00%
Total current assets	$ 19,084				$ 16,815				$ 19,084	$ 16,815
Total Assets	61,470				60,524				61,470	60,524
Total current liabilities	11,108				10,679				11,108	10,679
Revenues									38,542	42,951	$ 49,604
Gross margin	1,571	$ 1,341	$ 744	$ 1,540	1,486	$ 1,387	$ 1,594	$ 1,827	5,196	6,294
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,254	$ (1)	$ (217)	$ 258	(2,310)	$ 347	$ 90	$ 601	1,294	(1,272)	4,775
Principal Nonconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Total current assets	5,044				5,302				5,044	5,302
Assets, Noncurrent	25,298				26,477				25,298	26,477
Total Assets	30,342				31,779				30,342	31,779
Total current liabilities	3,942				3,743				3,942	3,743
Liabilities, Noncurrent	20,144				20,271				20,144	20,271
Liabilities	24,086				24,014				24,086	24,014
Noncontrolling interests	$ 132				$ 110				132	110
Revenues									9,470	10,905	14,461
Gross margin									619	644	2,320
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									$ (461)	$ (277)	$ 1,173