EMPLOYEE BENEFITS (Details - Assets Measured at Fair Value) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Investment Types
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,232	$ 1,294
Pensions | U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,931	4,465	$ 3,840
Pensions | U.S. | Levels 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,699	3,171
Pensions | U.S. | Levels 1, 2 and 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	247	133
Pensions | U.S. | Levels 1, 2 and 3 | Equity securities - U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	459	278
Pensions | U.S. | Levels 1, 2 and 3 | Equity securities - International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	183	186
Pensions | U.S. | Levels 1, 2 and 3 | Fixed maturity securities: U.S. investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,227	2,209
Pensions | U.S. | Levels 1, 2 and 3 | Fixed maturity securities - International investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	237	203
Pensions | U.S. | Levels 1, 2 and 3 | Fixed maturity securities - U.S. and international high yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	282	106
Pensions | U.S. | Levels 1, 2 and 3 | Mortgage-backed, asset-backed and collateralized
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	49	48
Pensions | U.S. | Levels 1, 2 and 3 | Other investment types - Futures
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(4)	(17)
Pensions | U.S. | Levels 1, 2 and 3 | Other investment types - Direct private equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6	11
Pensions | U.S. | Levels 1, 2 and 3 | Other investment types - Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13	14
Pensions | U.S. | Levels 1, 2 and 3 | Mutual Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	892	555
Pensions | U.S. | Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	247	133
Pensions | U.S. | Level 1 | Equity securities - U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	459	278
Pensions | U.S. | Level 1 | Equity securities - International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	183	161
Pensions | U.S. | Level 1 | Fixed maturity securities: U.S. investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 1 | Fixed maturity securities - International investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 1 | Fixed maturity securities - U.S. and international high yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 1 | Mortgage-backed, asset-backed and collateralized
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 1 | Other investment types - Futures
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	(17)
Pensions | U.S. | Level 1 | Other investment types - Direct private equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 1 | Other investment types - Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 1 | Mutual Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,791	2,596
Pensions | U.S. | Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 2 | Equity securities - U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 2 | Equity securities - International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	25
Pensions | U.S. | Level 2 | Fixed maturity securities: U.S. investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,217	2,200
Pensions | U.S. | Level 2 | Fixed maturity securities - International investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	237	203
Pensions | U.S. | Level 2 | Fixed maturity securities - U.S. and international high yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	282	106
Pensions | U.S. | Level 2 | Mortgage-backed, asset-backed and collateralized
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	49	48
Pensions | U.S. | Level 2 | Other investment types - Futures
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(7)	0
Pensions | U.S. | Level 2 | Other investment types - Direct private equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 2 | Other investment types - Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13	14
Pensions | U.S. | Level 2 | Mutual Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16	20	27
Pensions | U.S. | Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 3 | Equity securities - U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 3 | Equity securities - International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 3 | Fixed maturity securities: U.S. investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10	9	13
Pensions | U.S. | Level 3 | Fixed maturity securities - International investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 3 | Fixed maturity securities - U.S. and international high yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 3 | Mortgage-backed, asset-backed and collateralized
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 3 | Other investment types - Futures
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 3 | Other investment types - Direct private equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6	11	14
Pensions | U.S. | Level 3 | Other investment types - Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | U.S. | Level 3 | Mutual Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	977	899	861
Pensions | Non U.S. Plans | Levels 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	977	899
Pensions | Non U.S. Plans | Levels 1, 2 and 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	83	90
Pensions | Non U.S. Plans | Levels 1, 2 and 3 | Equity securities - U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Levels 1, 2 and 3 | Equity securities - International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	213	205
Pensions | Non U.S. Plans | Levels 1, 2 and 3 | Fixed maturity securities: U.S. investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Levels 1, 2 and 3 | Fixed maturity securities - International investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	174	158
Pensions | Non U.S. Plans | Levels 1, 2 and 3 | Fixed maturity securities - U.S. and international high yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	269	229
Pensions | Non U.S. Plans | Levels 1, 2 and 3 | Mortgage-backed, asset-backed and collateralized
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Levels 1, 2 and 3 | Other investment types - Futures
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Levels 1, 2 and 3 | Other investment types - Direct private equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Levels 1, 2 and 3 | Other investment types - Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	179	160
Pensions | Non U.S. Plans | Levels 1, 2 and 3 | Mutual Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	59	57
Pensions | Non U.S. Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	238	246
Pensions | Non U.S. Plans | Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	83	90
Pensions | Non U.S. Plans | Level 1 | Equity securities - U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 1 | Equity securities - International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	155	156
Pensions | Non U.S. Plans | Level 1 | Fixed maturity securities: U.S. investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 1 | Fixed maturity securities - International investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 1 | Fixed maturity securities - U.S. and international high yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 1 | Mortgage-backed, asset-backed and collateralized
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 1 | Other investment types - Futures
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 1 | Other investment types - Direct private equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 1 | Other investment types - Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 1 | Mutual Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	560	493
Pensions | Non U.S. Plans | Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 2 | Equity securities - U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 2 | Equity securities - International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	58	49
Pensions | Non U.S. Plans | Level 2 | Fixed maturity securities: U.S. investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 2 | Fixed maturity securities - International investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	174	158
Pensions | Non U.S. Plans | Level 2 | Fixed maturity securities - U.S. and international high yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	269	229
Pensions | Non U.S. Plans | Level 2 | Mortgage-backed, asset-backed and collateralized
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 2 | Other investment types - Futures
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 2 | Other investment types - Direct private equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 2 | Other investment types - Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 2 | Mutual Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	59	57
Pensions | Non U.S. Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	179	160	145
Pensions | Non U.S. Plans | Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 3 | Equity securities - U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 3 | Equity securities - International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 3 | Fixed maturity securities: U.S. investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 3 | Fixed maturity securities - International investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 3 | Fixed maturity securities - U.S. and international high yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 3 | Mortgage-backed, asset-backed and collateralized
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 3 | Other investment types - Futures
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 3 | Other investment types - Direct private equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pensions | Non U.S. Plans | Level 3 | Other investment types - Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	179	160	$ 145
Pensions | Non U.S. Plans | Level 3 | Mutual Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0