PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Change in Projected Benefit Obligation, Plan Assets and Funded Status) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2023	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance			$ 2,700
Defined Benefit Plan, Plan Assets, Payment for Settlement	$ (210)
Fair value of plan assets at end of year	2,400		2,400	$ 2,700
Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Beginning Balance			2,860	3,940
Defined Benefit Plan, Service Cost			32	37	$ 26
Defined Benefit Plan, Interest Cost			147	91	80
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		$ (87)	55	(826)
Defined Benefit Plan, Benefit Obligation, Benefits Paid			(246)	(265)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change			(4)	(117)
Defined Benefit Plan, Benefit Obligation, Ending Balance	2,633		2,633	2,860	3,940
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance			2,679	3,611
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)			146	(556)
Defined Benefit Plan, Plan Assets, Contributions by Employer			2	3
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan			(5)	(8)
Defined Benefit Plan, Plan Assets, Benefits Paid			(246)	(265)
Defined Benefit Plan, Plan Assets, Payment for Settlement			(211)	0
Defined Benefit Plan, Plan Assets, Period Increase (Decrease)			(5)	106
Fair value of plan assets at end of year	2,370		2,370	2,679	3,611
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(263)		(263)	(181)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Liability, Defined Benefit Plan, Current	(2)		(2)	(2)
Liability, Defined Benefit Plan, Noncurrent	(271)		(271)	(179)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(263)		(263)	(181)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	1,752		1,752	1,852
Assets for Plan Benefits, Defined Benefit Plan	10		10	0
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Beginning Balance			128	174
Defined Benefit Plan, Service Cost			0	1	1
Defined Benefit Plan, Interest Cost			7	3	3
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)			6	(48)
Defined Benefit Plan, Benefit Obligation, Benefits Paid			(8)	(2)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change			0	0
Defined Benefit Plan, Benefit Obligation, Ending Balance	133		133	128	174
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance			0	0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)			0	0
Defined Benefit Plan, Plan Assets, Contributions by Employer			0	0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan			0	0
Defined Benefit Plan, Plan Assets, Benefits Paid			0	0
Defined Benefit Plan, Plan Assets, Payment for Settlement			0	0
Defined Benefit Plan, Plan Assets, Period Increase (Decrease)			0	0
Fair value of plan assets at end of year	0		0	0	$ 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(133)		(133)	(128)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Liability, Defined Benefit Plan, Current	(12)		(12)	(12)
Liability, Defined Benefit Plan, Noncurrent	(121)		(121)	(116)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(133)		(133)	(128)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	(102)		(102)	(124)
Assets for Plan Benefits, Defined Benefit Plan	$ 0		$ 0	$ 0