ACCUMULATED OTHER COMPREHENSIVE INCOME - Components of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 8,675
Amounts reclassified from AOCI	0	$ (13)	$ (33)
Other comprehensive loss	0	(13)	(33)
Income tax (benefits) on other comprehensive income (loss)	(1)	(3)	(8)
Other comprehensive income (loss), net of tax	1	(10)	(25)
Ending Balance	10,166	8,675
Accumulated Other Comprehensive Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(15)	(5)	20
Other comprehensive income (loss), net of tax	1	(10)	(25)
Ending Balance	(14)	(15)	(5)
Gains & Losses on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(7)	(8)	(9)
Amounts reclassified from AOCI	9	1	1
Other comprehensive loss	9	1	1
Income tax (benefits) on other comprehensive income (loss)	2	0	0
Other comprehensive income (loss), net of tax	7	1	1
Ending Balance	0	(7)	(8)
Defined Benefit Pension & OPEB Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(8)	3	29
Amounts reclassified from AOCI	(9)	(14)	(34)
Other comprehensive loss	(9)	(14)	(34)
Income tax (benefits) on other comprehensive income (loss)	(3)	(3)	(8)
Other comprehensive income (loss), net of tax	(6)	(11)	(26)
Ending Balance	$ (14)	$ (8)	$ 3