RETIREMENT BENEFITS PLANS - Change in Plan Level 3 Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	$ 4,237
Ending balance	3,993	$ 4,237
Unobservable inputs (Level 3)
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	569
Ending balance	486	569
Unobservable inputs (Level 3) | Real estate
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	199
Ending balance	124	199
Unobservable inputs (Level 3) | Other
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	370
Ending balance	362	370
Pension plans | Unobservable inputs (Level 3)
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	569	559
Gains (losses) relating to assets still held at year-end	5	26
Purchases, sales, settlements - net	(88)	(7)
Transfers into or out of Level 3	0	(9)
Ending balance	486	569
Pension plans | Unobservable inputs (Level 3) | Real estate
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	199	199
Gains (losses) relating to assets still held at year-end	(24)	7
Purchases, sales, settlements - net	(51)	(7)
Transfers into or out of Level 3	0	0
Ending balance	124	199
Pension plans | Unobservable inputs (Level 3) | Other
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	370	360
Gains (losses) relating to assets still held at year-end	29	19
Purchases, sales, settlements - net	(37)	0
Transfers into or out of Level 3	0	(9)
Ending balance	$ 362	$ 370