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FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Short-term investments | $ 3,402 | $ 1,593
Price risk management instruments, netting | 44 | 88
Price risk management instruments, assets | 252 | 297
TOTAL ASSETS | 7,477 | 5,350
Liabilities: |  |
Price risk management instruments, netting | (7) | (10)
TOTAL LIABILITIES | 85 | 109
Amount primarily related to deferred taxes on appreciation of investment value | 491 | 408
Nuclear decommissioning trusts |  |
Assets: |  |
Short-term investments | 16 | 29
Global equity securities | 1,959 | 1,793
Fixed-income securities | 1,513 | 1,300
TOTAL ASSETS | 3,507 | 3,138
Rabbi trusts |  |
Assets: |  |
Fixed-income securities | 98 | 93
Life insurance contracts | 71 | 67
TOTAL ASSETS | 169 | 160
Long-term disability trust |  |
Assets: |  |
Short-term investments | 5 | 7
TOTAL ASSETS | 147 | 162
Price Risk Derivative, Electricity |  |
Assets: |  |
Price risk management instruments, netting | 20 | 51
Price risk management instruments, assets | 225 | 259
Liabilities: |  |
Price risk management instruments, netting | (4) | (10)
Price risk management instruments, liabilities | 83 | 107
Price Risk Derivative, Gas |  |
Assets: |  |
Price risk management instruments, netting | 24 | 37
Price risk management instruments, assets | 27 | 38
Liabilities: |  |
Price risk management instruments, netting | (3) | 0
Price risk management instruments, liabilities | 2 | 2
Level 1 |  |
Assets: |  |
Short-term investments | 3,402 | 1,593
Price risk management instruments, gross subject to netting | 0 | 0
TOTAL ASSETS | 6,197 | 4,083
Liabilities: |  |
TOTAL LIABILITIES | 2 | 4
Level 1 | Nuclear decommissioning trusts |  |
Assets: |  |
Short-term investments | 16 | 29
Global equity securities | 1,959 | 1,793
Fixed-income securities | 815 | 661
TOTAL ASSETS | 2,790 | 2,483
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 | 7
TOTAL ASSETS | 5 | 7
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 | 0 | 4
Level 1 | Price Risk Derivative, Gas |  |
Assets: |  |
Price risk management instruments, gross subject to netting | 0 | 0
Liabilities: |  |
Price risk management instruments, gross subject to netting | 2 | 0
Level 2 |  |
Assets: |  |
Short-term investments | 0 | 0
Price risk management instruments, gross subject to netting | 16 | 6
TOTAL ASSETS | 883 | 805
Liabilities: |  |
TOTAL LIABILITIES | 7 | 7
Level 2 | Nuclear decommissioning trusts |  |
Assets: |  |
Short-term investments | 0 | 0
Global equity securities | 0 | 0
Fixed-income securities | 698 | 639
TOTAL ASSETS | 698 | 639
Level 2 | Rabbi trusts |  |
Assets: |  |
Fixed-income securities | 98 | 93
Life insurance contracts | 71 | 67
TOTAL ASSETS | 169 | 160
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 | 13 | 5
Liabilities: |  |
Price risk management instruments, gross subject to netting | 4 | 5
Level 2 | Price Risk Derivative, Gas |  |
Assets: |  |
Price risk management instruments, gross subject to netting | 3 | 1
Liabilities: |  |
Price risk management instruments, gross subject to netting | 3 | 2
Level 3 |  |
Assets: |  |
Short-term investments | 0 | 0
Price risk management instruments, gross subject to netting | 192 | 203
TOTAL ASSETS | 192 | 203
Liabilities: |  |
TOTAL LIABILITIES | 83 | 108
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 | 192 | 203
Liabilities: |  |
Price risk management instruments, gross subject to netting | 83 | 108
Level 3 | Price Risk Derivative, Gas |  |
Assets: |  |
Price risk management instruments, gross subject to netting | 0 | 0
Liabilities: |  |
Price risk management instruments, gross subject to netting | 0 | 0
Fair Value Measured at Net Asset Value | Nuclear decommissioning trusts |  |
Assets: |  |
Assets measured at NAV | 19 | 16
Fair Value Measured at Net Asset Value | Long-term disability trust |  |
Assets: |  |
Assets measured at NAV | $ 142 | $ 155

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