ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Changes in AOCI by Component (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period (in usd)	$ 5,895	$ 9,121
Other comprehensive income (loss) before reclassifications	29	(398)
Amounts reclassified from AOCI	(10)	11
Net other comprehensive income (loss) from continuing operations	19	(387)
Balance, end of period (in usd)	5,631	8,903
CTA
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period (in usd)	(3,386)	(2,907)
Other comprehensive income (loss) before reclassifications	25	(432)
Amounts reclassified from AOCI	0	0
Net other comprehensive income (loss) from continuing operations	25	(432)
Balance, end of period (in usd)	(3,361)	(3,339)
Pension and OPEB plans
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period (in usd)	(331)	(347)
Other comprehensive income (loss) before reclassifications	(4)	19
Amounts reclassified from AOCI	(7)	13
Net other comprehensive income (loss) from continuing operations	(11)	32
Balance, end of period (in usd)	(342)	(315)
Hedging activities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period (in usd)	(119)	(126)
Other comprehensive income (loss) before reclassifications	8	13
Amounts reclassified from AOCI	(3)	(2)
Net other comprehensive income (loss) from continuing operations	5	11
Balance, end of period (in usd)	(114)	(115)
Available-for-sale debt securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period (in usd)	3	0
Other comprehensive income (loss) before reclassifications	0	2
Amounts reclassified from AOCI	0	0
Net other comprehensive income (loss) from continuing operations	0	2
Balance, end of period (in usd)	3	2
Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period (in usd)	(3,833)	(3,380)
Balance, end of period (in usd)	$ (3,814)	$ (3,767)