ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 3	$ 9
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	2	14
AOCI Tax, Attributable to Parent	96	117	$ 97	$ 122
Accumulated Other Comprehensive Income (Loss), Net of Tax	(294)	(365)	(299)	(388)
Reclassification from AOCI, Current Period, Tax	(1)	(2)
Income tax effect	0	(3)
Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent	(45)	(78)	(46)	(104)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	1	20
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	0	6
AOCI Employee Benefit Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent	(354)	(416)	(358)	(421)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	0	0
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	4	5
AOCI - Interest Rate Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent	9	12	$ 8	$ 15
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	1	(3)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	$ 0	$ 0