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FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets: |  |
Short-term investments | $ 245 | $ 289
Price risk management instruments, netting | 44 | 143
Price risk management instruments, assets | 285 | 370
TOTAL ASSETS | 5,219 | 5,558
Liabilities: |  |
Price risk management instruments, netting | (25) | (27)
TOTAL LIABILITIES | 249 | 242
Amount primarily related to deferred taxes on appreciation of investment value | 731 | 783
Nuclear decommissioning trusts |  |
Assets: |  |
Short-term investments | 73 | 22
Global equity securities | 2,297 | 2,504
Fixed-income securities | 1,966 | 2,024
TOTAL ASSETS | 4,366 | 4,581
Rabbi trusts |  |
Assets: |  |
Fixed-income securities | 99 | 104
Life insurance contracts | 73 | 76
TOTAL ASSETS | 172 | 180
Long-term disability trust |  |
Assets: |  |
Short-term investments | 6 | 6
TOTAL ASSETS | 151 | 138
Price Risk Derivative, Electricity |  |
Assets: |  |
Price risk management instruments, netting | 4 | 6
Price risk management instruments, assets | 240 | 229
Liabilities: |  |
Price risk management instruments, netting | (16) | (24)
Price risk management instruments, liabilities | 247 | 235
Price Risk Derivative, Gas |  |
Assets: |  |
Price risk management instruments, netting | 40 | 137
Price risk management instruments, assets | 45 | 141
Liabilities: |  |
Price risk management instruments, netting | (9) | (3)
Price risk management instruments, liabilities | 2 | 7
Level 1 |  |
Assets: |  |
Short-term investments | 245 | 289
Price risk management instruments, gross subject to netting | 0 | 0
TOTAL ASSETS | 3,756 | 3,979
Liabilities: |  |
TOTAL LIABILITIES | 0 | 0
Level 1 | Nuclear decommissioning trusts |  |
Assets: |  |
Short-term investments | 73 | 22
Global equity securities | 2,297 | 2,504
Fixed-income securities | 1,135 | 1,158
TOTAL ASSETS | 3,505 | 3,684
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 | 6 | 6
TOTAL ASSETS | 6 | 6
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 | 0
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 | 0 | 0
Level 2 |  |
Assets: |  |
Short-term investments | 0 | 0
Price risk management instruments, gross subject to netting | 32 | 13
TOTAL ASSETS | 1,035 | 1,059
Liabilities: |  |
TOTAL LIABILITIES | 41 | 21
Level 2 | Nuclear decommissioning trusts |  |
Assets: |  |
Short-term investments | 0 | 0
Global equity securities | 0 | 0
Fixed-income securities | 831 | 866
TOTAL ASSETS | 831 | 866
Level 2 | Rabbi trusts |  |
Assets: |  |
Fixed-income securities | 99 | 104
Life insurance contracts | 73 | 76
TOTAL ASSETS | 172 | 180
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 | 27 | 9
Liabilities: |  |
Price risk management instruments, gross subject to netting | 30 | 11
Level 2 | Price Risk Derivative, Gas |  |
Assets: |  |
Price risk management instruments, gross subject to netting | 5 | 4
Liabilities: |  |
Price risk management instruments, gross subject to netting | 11 | 10
Level 3 |  |
Assets: |  |
Short-term investments | 0 | 0
Price risk management instruments, gross subject to netting | 209 | 214
TOTAL ASSETS | 209 | 214
Liabilities: |  |
TOTAL LIABILITIES | 233 | 248
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 | 209 | 214
Liabilities: |  |
Price risk management instruments, gross subject to netting | 233 | 248
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 Per Share | Nuclear decommissioning trusts |  |
Assets: |  |
Assets measured at NAV | 30 | 31
Fair Value Measured at Net Asset Value Per Share | Long-term disability trust |  |
Assets: |  |
Assets measured at NAV | $ 145 | $ 132

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