PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Reconciliation of the Change in Benefit Obligation and Plan Asset, Funded Status and Amounts Recognized in the Financial Statements (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 3,752	$ 3,910
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	4,550	4,181
Service cost	135	124	$ 204
Interest cost	229	217	188
Actuarial (gain) loss	(460)	204
Benefits paid	(135)	(177)
Other	(4)	1
Projected benefit obligation at end of year	4,315	4,550	4,181
Change in plan assets:
Fair value of plan assets at beginning of year	3,599	3,467
Actual income on plan assets	132	281
Employer contributions	5	22
Benefits paid	(135)	(177)
Other	0	6
Fair value of plan assets at end of year	3,601	3,599	3,467
Funded status—Net amount recognized	(714)	(951)
Amounts recognized in the consolidated balance sheets consist of:
Noncurrent asset	22	21
Current liability	(7)	(4)
Noncurrent liability	(729)	(968)
Total liability	(714)	(951)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Net actuarial gain (loss)	95	(242)
Total accumulated other comprehensive gain (loss)	95	(242)
Other Postretirement Benefits
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	746	788
Service cost	5	4	9
Interest cost	38	42	30
Plan participants' contributions	65	67
Actuarial (gain) loss	(101)	22
Benefits paid	(163)	(177)
Projected benefit obligation at end of year	590	746	788
Change in plan assets:
Fair value of plan assets at beginning of year	46	48
Actual income on plan assets	1	1
Employer contributions	96	107
Plan participants' contributions	65	67
Benefits paid	(163)	(177)
Fair value of plan assets at end of year	45	46	$ 48
Funded status—Net amount recognized	(545)	(700)
Amounts recognized in the consolidated balance sheets consist of:
Current liability	(41)	(63)
Noncurrent liability	(504)	(637)
Total liability	(545)	(700)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Net actuarial gain (loss)	383	309
Prior service cost	129	222
Total accumulated other comprehensive gain (loss)	$ 512	$ 531

PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Reconciliation of the Change in Benefit Obligation and Plan Asset, Funded Status and Amounts Recognized in the Financial Statements (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2024

Dec. 31, 2023

Dec. 31, 2022

Pension Benefits

Defined Benefit Plan Disclosure [Line Items]

Accumulated benefit obligation

$ 3,752

$ 3,910

Change in projected benefit obligation:

Projected benefit obligation at beginning of year

4,550