RETIREMENT BENEFITS - Assumptions Used (Details)								3 Months Ended												12 Months Ended
	Jan. 01, 2024	Jan. 01, 2023	Dec. 31, 2022	Oct. 01, 2021	Apr. 01, 2021	Jan. 01, 2021	Dec. 31, 2020	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Plan Assumptions - At year end
Expected return on assets (as a percent)			1.50%					3.00%				1.50%				1.50%				3.00%	1.50%	1.50%
VEBA Trust
Plan Assumptions - During the year
Expected return on assets (as a percent)																1.50%	5.00%	5.60%	5.80%	3.00%
U.S.
Plan Assumptions - At year end
Interest crediting rate (as percent)			4.50%					4.10%				4.50%								4.10%	4.50%
Plan Assumptions - During the year
Weighted average interest crediting rate								5.05%	4.40%	4.15%	4.50%	4.65%	3.80%	2.80%	1.80%	1.80%	1.75%	2.10%	1.45%
U.S. | Postretirement Benefit Plans
Plan Assumptions - At year end
Discount rate (as a percent)			5.60%					5.20%				5.60%								5.20%	5.60%
Expected return on assets (as a percent)			5.70%					5.70%				5.70%								5.70%	5.70%
Plan Assumptions - During the year
Discount rate (as a percent)								6.10%	5.50%	5.25%	5.60%	5.65%	4.75%	3.85%	2.75%	2.65%	2.60%	2.85%	2.20%
Expected return on assets (as a percent)		5.70%	5.00%											1.50%	5.00%					5.70%
U.S. | Postretirement Benefit Plans | Subsequent event
Plan Assumptions - During the year
Expected return on assets (as a percent)	5.70%
U.S. | VEBA Trust
Plan Assumptions - At year end
Expected return on assets (as a percent)			3.00%					3.00%				3.00%								3.00%	3.00%
Plan Assumptions - During the year
Expected return on assets (as a percent)		3.00%																		3.00%	1.50%	1.50%
Non-U.S.
Plan Assumptions - At year end
Interest crediting rate (as percent)			1.73%					1.78%				1.73%								1.78%	1.73%
Plan Assumptions - During the year
Weighted average interest crediting rate																				1.73%	1.61%	1.60%
Non-U.S. | Pension Plans | Weighted Average
Plan Assumptions - At year end
Discount rate (as a percent)			6.66%					6.91%				6.66%								6.91%	6.66%
Future compensation increase rate (as a percent)			3.76%					3.84%				3.76%								3.84%	3.76%
Expected return on assets (as a percent)			6.05%					6.62%				6.05%								6.62%	6.05%
Plan Assumptions - During the year
Discount rate (as a percent)																				6.66%	3.96%	3.14%
Future compensation increase rate (as a percent)																				3.76%	3.10%	3.10%
Expected return on assets (as a percent)																				6.05%	3.69%	3.39%
Non-U.S. | Pension Plans | Minimum
Plan Assumptions - At year end
Discount rate, plans with relatively short duration (as a percent)			1.75%					1.35%				1.75%								1.35%	1.75%
Future compensation increase rate (as a percent)			1.30%					1.30%				1.30%								1.30%	1.30%
Expected return on assets (as a percent)			1.00%					2.00%				1.00%								2.00%	1.00%
Plan Assumptions - During the year
Discount rate, plans with relatively short duration (as a percent)																				1.75%	(0.10%)	(0.25%)
Future compensation increase rate (as a percent)																				1.30%	1.30%	1.20%
Expected return on assets (as a percent)																				1.00%	0.00%	0.00%
Non-U.S. | Pension Plans | Maximum
Plan Assumptions - At year end
Discount rate, plans with relatively short duration (as a percent)			25.20%					14.55%				25.20%								14.55%	25.20%
Future compensation increase rate (as a percent)			23.11%					12.40%				23.11%								12.40%	23.11%
Expected return on assets (as a percent)			11.50%					11.50%				11.50%								11.50%	11.50%
Plan Assumptions - During the year
Discount rate, plans with relatively short duration (as a percent)																				25.20%	11.95%	11.15%
Future compensation increase rate (as a percent)																				23.11%	11.25%	11.25%
Expected return on assets (as a percent)																				11.50%	11.50%	11.50%
Non-U.S. | Postretirement Benefit Plans | Weighted Average
Plan Assumptions - At year end
Discount rate (as a percent)			9.80%					9.90%				9.80%								9.90%	9.80%
Expected return on assets (as a percent)			8.70%					9.39%				8.70%								9.39%	8.70%
Plan Assumptions - During the year
Discount rate (as a percent)																				9.80%	8.28%	7.42%
Expected return on assets (as a percent)																				8.70%	7.99%	7.99%
Non-U.S. | Postretirement Benefit Plans | Minimum
Plan Assumptions - At year end
Discount rate (as a percent)			3.25%					3.80%				3.25%								3.80%	3.25%
Expected return on assets (as a percent)			8.70%					8.60%				8.70%								8.60%	8.70%
Plan Assumptions - During the year
Discount rate (as a percent)																				3.25%	1.05%	0.80%
Expected return on assets (as a percent)																				8.70%	6.00%	5.95%
Non-U.S. | Postretirement Benefit Plans | Maximum
Plan Assumptions - At year end
Discount rate (as a percent)			10.60%					10.70%				10.60%								10.70%	10.60%
Expected return on assets (as a percent)			9.10%					9.40%				9.10%								9.40%	9.10%
Plan Assumptions - During the year
Discount rate (as a percent)																				11.55%	11.25%	9.80%
Expected return on assets (as a percent)																				9.10%	8.00%	8.00%
Qualified | U.S. | Pension Plans
Plan Assumptions - At year end
Discount rate (as a percent)			5.50%					5.10%				5.50%								5.10%	5.50%
Expected return on assets (as a percent)			5.70%					5.70%				5.70%								5.70%	5.70%
Plan Assumptions - During the year
Discount rate (as a percent)								6.05%	5.40%	5.15%	5.50%	5.65%	4.80%	3.80%	2.80%	2.80%	2.75%	3.10%	2.45%
Expected return on assets (as a percent)		5.70%	5.00%	5.00%	5.60%	5.80%	6.70%								5.00%	5.00%	5.60%	5.60%	5.80%	5.70%
Qualified | U.S. | Pension Plans | Subsequent event
Plan Assumptions - During the year
Expected return on assets (as a percent)	5.70%
Qualified | U.S. | Postretirement Benefit Plans
Plan Assumptions - During the year
Expected return on assets (as a percent)				5.00%	5.60%	5.80%	6.70%
Nonqualified | U.S. | Pension Plans
Plan Assumptions - At year end
Discount rate (as a percent)			5.55%					5.15%				5.55%								5.15%	5.55%
Plan Assumptions - During the year
Discount rate (as a percent)								6.10%	5.45%	5.20%	5.55%	5.60%	4.80%	3.85%	2.80%	2.75%	2.70%	3.00%	2.35%