RETIREMENT BENEFITS PLANS - Change in Plan Level 3 Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Balance at January 1	$ 5,919
Balance at December 31	4,121	$ 5,919
Unobservable inputs (Level 3)
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Balance at January 1	535
Balance at December 31	559	535
Unobservable inputs (Level 3) | Real estate
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Balance at January 1	216
Balance at December 31	199	216
Unobservable inputs (Level 3) | Other
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Balance at January 1	319
Balance at December 31	360	319
Pension plans | Unobservable inputs (Level 3)
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Balance at January 1	535	358
Gains (losses) relating to assets still held at year-end	(2)	89
Purchases, sales, settlements - net	26	83
Transfers into or out of Level 3	0	5
Balance at December 31	559	535
Pension plans | Unobservable inputs (Level 3) | Real estate
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Balance at January 1	216	184
Gains (losses) relating to assets still held at year-end	1	28
Purchases, sales, settlements - net	(18)	4
Transfers into or out of Level 3	0	0
Balance at December 31	199	216
Pension plans | Unobservable inputs (Level 3) | Other
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Balance at January 1	319	174
Gains (losses) relating to assets still held at year-end	(3)	61
Purchases, sales, settlements - net	44	79
Transfers into or out of Level 3	0	5
Balance at December 31	$ 360	$ 319