STOCKHOLDERS' EQUITY (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (10,855)	$ (10,246)
Total other comprehensive income (loss)	1,878	(609)	$ (1,154)
Settlements and transfers related to separation from DowDuPont Inc.	0	0	1,935
Ending Balance	(8,977)	(10,855)	(10,246)
Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	104	64	(51)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(21)	104	178
Other Comprehensive Income (Loss) before Reclassifications, Tax	5	(23)	(38)
Other comprehensive income (loss) before reclassifications	(16)	81	140
Total other comprehensive income (loss)	(45)	40	115
Ending Balance	59	104	64
Cumulative Translation Adj
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(930)	(1,135)	(1,813)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(375)	227	59
Other Comprehensive Income (Loss) before Reclassifications, Tax	(40)	25	(2)
Other comprehensive income (loss) before reclassifications	(415)	252	57
Total other comprehensive income (loss)	(425)	205	(32)
Ending Balance	(1,355)	(930)	(1,135)
Pension and Other Postretire Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(9,559)	(8,781)	(7,965)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	2,094	(1,769)	(1,699)
Other Comprehensive Income (Loss) before Reclassifications, Tax	(464)	411	413
Other comprehensive income (loss) before reclassifications	1,630	(1,358)	(1,286)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	776	753	504
Reclassification from AOCI, Current Period, Tax	(181)	(173)	(117)
Amounts reclassified from accumulated other comprehensive income (loss)	595	580	387
Total other comprehensive income (loss)	2,225	(778)	(899)
Ending Balance	(7,334)	(9,559)	(8,781)
Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(470)	(394)	(56)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	155	(96)	(470)
Other Comprehensive Income (Loss) before Reclassifications, Tax	3	(1)	101
Other comprehensive income (loss) before reclassifications	158	(97)	(369)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(38)	30	44
Reclassification from AOCI, Current Period, Tax	3	(9)	(13)
Amounts reclassified from accumulated other comprehensive income (loss)	(35)	21	31
Total other comprehensive income (loss)	123	(76)	(338)
Ending Balance	(347)	(470)	(394)
Retained Earnings [Member] | Cumulative Translation Adj
Accumulated Other Comprehensive Income (Loss) [Line Items]
Settlements and transfers related to separation from DowDuPont Inc.	0	0	710
Retained Earnings [Member] | Pension and Other Postretire Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Settlements and transfers related to separation from DowDuPont Inc.	0	0	83
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(38)	(54)	(33)
Reclassification from AOCI, Current Period, Tax	9	13	8
Amounts reclassified from accumulated other comprehensive income (loss)	(29)	(41)	(25)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cumulative Translation Adj
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)	$ (10)	$ (47)	$ (89)