SEGMENT OF BUSINESS INFORMATION (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Electric Regulated Revenue	$ (480,000,000)	$ 547,000,000
Operating Income	(1,143,000,000)	121,000,000
Provision for rate credits	(1,009,000,000)
Regulated Operating Revenue, Gas	145,000,000	155,000,000
Net Income (Loss) Attributable to Parent	(1,109,000,000)	124,000,000
Regulated Operating Revenue	(335,000,000)	702,000,000
Electric Operations
Segment Reporting Information [Line Items]
Regulated Operating Revenue, Before Adjustments	527,000,000
Net Income (Loss) Attributable to Parent	48,000,000	100,000,000
Regulated Operating Revenue	(480,000,000)	547,000,000
Gas Distribution
Segment Reporting Information [Line Items]
Regulated Operating Revenue, Before Adjustments	147,000,000
Net Income (Loss) Available to Common Stockholders, Basic	22,000,000
Regulated and Unregulated Operating Revenue		155,000,000
Net Income (Loss) Attributable to Parent		32,000,000
Regulated Operating Revenue	145,000,000	155,000,000
All Other [member]
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Parent	(1,173,000,000)	(4,000,000)
Adjustments/Eliminations
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	0	0
Net Income (Loss) Attributable to Parent	$ (6,000,000)	$ (4,000,000)