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REGULATORY MATTERS Net Changes in Regulatory Assets and Liabilities (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
Revenue Accruals and Deferrals  
Beginning balance $ (1)
Net collection of 2015 revenue deferrals and accruals, including accrued interest (4)
Net revenue accrual for the three months ended March 31, 2017 22
Ending balance $ 17