REVISION OF PREVIOUSLY ISSUED FINANCIAL STATEMENTS - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
BENEFITS AND OTHER DEDUCTIONS
Other operating costs and expenses	$ 23	$ 23
Total benefits and other deductions	180	147
Income (loss) from continuing operations, before income taxes	(9)	(26)
Net income (loss) from continuing operations		(20)
Net income (loss)	$ 63	(20)
As Previously Reported
BENEFITS AND OTHER DEDUCTIONS
Other operating costs and expenses		21
Total benefits and other deductions		161
Income (loss) from continuing operations, before income taxes		(22)
Net income (loss) from continuing operations		(19)
Net income (loss)		(19)
ASU 2018-12 Impact
BENEFITS AND OTHER DEDUCTIONS
Other operating costs and expenses		1
Total benefits and other deductions		(15)
Income (loss) from continuing operations, before income taxes		(3)
Net income (loss) from continuing operations		0
Net income (loss)		0
As Adjusted
BENEFITS AND OTHER DEDUCTIONS
Other operating costs and expenses		22
Total benefits and other deductions		146
Income (loss) from continuing operations, before income taxes		(25)
Net income (loss) from continuing operations		(19)
Net income (loss)		(19)
Impact of Revisions
BENEFITS AND OTHER DEDUCTIONS
Other operating costs and expenses		1
Total benefits and other deductions		1
Income (loss) from continuing operations, before income taxes		(1)
Net income (loss) from continuing operations		(1)
Net income (loss)		$ (1)