PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2023	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	$ (149)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)			$ 144	$ (34)	$ (32)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost			32	37	26
Defined Benefit Plan, Interest Cost			147	91	80
Defined Benefit Plan, Expected Return (Loss) on Plan Assets			(204)	(226)	(219)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)			0	(1)	(1)
Defined Benefit Plan, Amortization of Gain (Loss)			60	108	116
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment		$ (7)	149	0	(7)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)			184	9	(5)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax			109	(47)	(144)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax			0	1	1
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax			(60)	(108)	(116)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax			(149)	0	7
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax, Total			(100)	(154)	(252)
Total recognized in net periodic benefit cost and other comprehensive loss or income			84	(145)	(257)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost			0	1	1
Defined Benefit Plan, Interest Cost			7	3	3
Defined Benefit Plan, Expected Return (Loss) on Plan Assets			0	0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)			0	0	0
Defined Benefit Plan, Amortization of Gain (Loss)			(15)	(9)	(4)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment			0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)			(8)	(5)	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax			7	(49)	(36)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax			0	0	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax			15	9	4
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax			0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax, Total			22	(40)	(32)
Total recognized in net periodic benefit cost and other comprehensive loss or income			$ 14	$ (45)	$ (32)