RETIREMENT BENEFITS - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Plan asset amortization period	5 years
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 61,000,000	$ 60,000,000
Expected future employer contributions, next fiscal year	0
Actuarial losses	$ (3,908,000,000)	$ (393,000,000)
Change in discount rate	21600.00%	0.28%
Pension plans | Qualified pension plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 0
Other postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	73,000,000	$ 43,000,000
Expected future employer contributions, next fiscal year	0
Actuarial losses	$ (365,000,000)	$ (54,000,000)