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FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Short-term investments |  | $ 385
Derivative Asset | $ 131 | 139
TOTAL ASSETS | 3,723 | 4,145
Liabilities: |  |
Price risk management instruments, netting | (34) |
TOTAL LIABILITIES | 86 | 88
Amount primarily related to deferred taxes on appreciation of investment value | 440 | 440
Nuclear decommissioning trusts |  |
Assets: |  |
Short-term investments | 28 | 23
Global equity securities | 1,862 | 1,967
Fixed-income securities | 1,375 | 1,295
Assets measured at NAV | 17 | 18
TOTAL ASSETS | 3,282 | 3,303
Rabbi trusts |  |
Assets: |  |
Fixed-income securities | 74 | 72
Life insurance contracts | 69 | 71
TOTAL ASSETS | 143 | 143
Long-term disability trust |  |
Assets: |  |
Short-term investments | 5 | 8
Assets measured at NAV | 162 | 167
TOTAL ASSETS | 167 | 175
Price Risk Derivative, Electricity |  |
Assets: |  |
Price risk management instruments, netting | 3 | 6
Derivative Asset | 130 | 138
Liabilities: |  |
Price risk management instruments, netting | (33) | (25)
Derivative Liability | 85 | 87
Price Risk Derivative, Gas |  |
Assets: |  |
Derivative Asset | 1 | 1
Liabilities: |  |
Price risk management instruments, netting | (1) | 0
Derivative Liability | 1 | 1
Level 1 |  |
Assets: |  |
Short-term investments |  | 385
Derivative Asset | 0 | 0
TOTAL ASSETS | 2,671 | 3,116
Liabilities: |  |
TOTAL LIABILITIES | 8 | 10
Level 1 | Nuclear decommissioning trusts |  |
Assets: |  |
Short-term investments | 28 | 23
Global equity securities | 1,862 | 1,967
Fixed-income securities | 776 | 733
TOTAL ASSETS | 2,666 | 2,723
Level 1 | Rabbi trusts |  |
Assets: |  |
Fixed-income securities | 0 | 0
Life insurance contracts | 0 | 0
TOTAL ASSETS | 0 | 0
Level 1 | Long-term disability trust |  |
Assets: |  |
Short-term investments | 5 | 8
TOTAL ASSETS | 5 | 8
Level 1 | Price Risk Derivative, Electricity |  |
Assets: |  |
Price risk management instruments, gross subject to netting | 0 | 0
Liabilities: |  |
Price risk management instruments, gross subject to netting | 8 | 10
Level 1 | Price Risk Derivative, Gas |  |
Assets: |  |
Derivative Asset | 0 | 0
Liabilities: |  |
Price risk management instruments, gross subject to netting | 0 | 0
Level 2 |  |
Assets: |  |
Short-term investments |  | 0
Derivative Asset | 3 | 4
TOTAL ASSETS | 745 | 709
Liabilities: |  |
TOTAL LIABILITIES | 27 | 16
Level 2 | Nuclear decommissioning trusts |  |
Assets: |  |
Short-term investments | 0 | 0
Global equity securities | 0 | 0
Fixed-income securities | 599 | 562
TOTAL ASSETS | 599 | 562
Level 2 | Rabbi trusts |  |
Assets: |  |
Fixed-income securities | 74 | 72
Life insurance contracts | 69 | 71
TOTAL ASSETS | 143 | 143
Level 2 | Long-term disability trust |  |
Assets: |  |
Short-term investments | 0 | 0
TOTAL ASSETS | 0 | 0
Level 2 | Price Risk Derivative, Electricity |  |
Assets: |  |
Price risk management instruments, gross subject to netting | 2 | 3
Liabilities: |  |
Price risk management instruments, gross subject to netting | 25 | 15
Level 2 | Price Risk Derivative, Gas |  |
Assets: |  |
Derivative Asset | 1 | 1
Liabilities: |  |
Price risk management instruments, gross subject to netting | 2 | 1
Level 3 |  |
Assets: |  |
Short-term investments |  | 0
Derivative Asset | 125 | 129
TOTAL ASSETS | 125 | 129
Liabilities: |  |
TOTAL LIABILITIES | 85 | 87
Level 3 | Nuclear decommissioning trusts |  |
Assets: |  |
Short-term investments | 0 | 0
Global equity securities | 0 | 0
Fixed-income securities | 0 | 0
TOTAL ASSETS | 0 | 0
Level 3 | Rabbi trusts |  |
Assets: |  |
Fixed-income securities | 0 | 0
Life insurance contracts | 0 | 0
TOTAL ASSETS | 0 | 0
Level 3 | Long-term disability trust |  |
Assets: |  |
Short-term investments | 0 | 0
TOTAL ASSETS | 0 | 0
Level 3 | Price Risk Derivative, Electricity |  |
Assets: |  |
Price risk management instruments, gross subject to netting | 125 | 129
Liabilities: |  |
Price risk management instruments, gross subject to netting | 85 | 87
Level 3 | Price Risk Derivative, Gas |  |
Assets: |  |
Derivative Asset | 0 | 0
Liabilities: |  |
Price risk management instruments, gross subject to netting | $ 0 | $ 0

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