FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) - USD ($)
|
3 Months Ended |
9 Months Ended |
|
|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
|
|
|
|
| Beginning of period |
$ 24,000,000
|
$ 42,000,000
|
$ 19,000,000
|
$ 107,000,000
|
|
|
| Realized and unrealized losses |
(145,000,000)
|
(49,000,000)
|
(138,000,000)
|
(103,000,000)
|
|
|
| Allocated transmission instruments |
|
|
0
|
1,000,000
|
|
|
| Settlements |
(34,000,000)
|
(43,000,000)
|
(32,000,000)
|
(31,000,000)
|
|
|
| End of period |
(87,000,000)
|
36,000,000
|
(87,000,000)
|
36,000,000
|
|
|
| Change in unrealized gains relating to instruments still held at the end of the period |
(114,000,000)
|
$ (8,000,000)
|
(111,000,000)
|
$ (54,000,000)
|
|
|
| Minimum [Member] |
|
|
|
|
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
|
|
|
|
| Congestion Revenue Rights |
|
|
|
|
|
$ (16)
|
| Market Electricity Forward Price Inputs |
19.20
|
|
19.20
|
|
|
|
| Maximum [Member] |
|
|
|
|
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
|
|
|
|
| Congestion Revenue Rights |
|
|
|
|
|
$ 8
|
| Market Electricity Forward Price Inputs |
$ 58.50
|
|
$ 58.50
|
|
|
|
| Forecast [Member] | Minimum [Member] |
|
|
|
|
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
|
|
|
|
| Congestion Revenue Rights |
|
|
|
|
$ (24)
|
|
| Forecast [Member] | Maximum [Member] |
|
|
|
|
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
|
|
|
|
| Congestion Revenue Rights |
|
|
|
|
$ 10
|
|