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FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Schedule of Reconciliation of Changes in Fair Value of Assets and Liabilities) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]    
Beginning of Period $ (2,000,000) $ (9,000,000)
Gains (Losses) Recorded to:    
Gains (Losses) Recorded to Net Regulatory Assets or Liabilities - Derivative Instruments 2,000,000 (4,000,000)
Gains/(Losses) Recorded to Electric Wholesale Sales 4,000,000 3,000,000
Settlements (3,000,000) 8,000,000
End of Period 1,000,000 (2,000,000)
Change in Unrealized Gains (Losses) related to Assets (Liabilities) still held 1,000,000 (1,000,000)
Transfers out of Level 3 $ 0 $ 0