EMPLOYEE BENEFIT PLANS (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) noncallable_bond	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Assumed health care cost trend rate	6.25%
Ultimate trend rate	4.50%
Assumed return	6.00%
10 year actual rate of return	5.30%
Number of Aa-grade non-callable bonds used to develop the yield curve for rate used (noncallable bond) | noncallable_bond	858
Total fair value of trust other net liabilities	$ 10	$ 11
Retirement savings plan expense	$ 158	$ 144	$ 133
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
10 year actual rate of return	6.00%	6.10%	5.50%
Company contributions	$ 336	$ 339
Expected employer contribution next year	327
Long-term Disability Trusts
Defined Benefit Plan Disclosure [Line Items]
Company contributions	31
Expected employer contribution next year	31
PBOP Plans
Defined Benefit Plan Disclosure [Line Items]
Company contributions	$ 5	$ 26