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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Reclassifications Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | $ 25,292 | $ 23,075
Loss on investments | (1) | 5
Net current period other comprehensive gain (loss) | (1) | 5
Ending balance | 25,983 | 23,586
Pension Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amount attributable to tax, before reclassification | 0 | 0
Loss on investments | 0 | 0
Net current period other comprehensive gain (loss) | 0 | 0
Other Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amount attributable to tax, before reclassification | 0 | 0
Loss on investments | 0 | 0
Net current period other comprehensive gain (loss) | 0 | 0
Customer Credit Trust |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amount attributable to tax, before reclassification | 1 | 2
Loss on investments | (1) | 5
Net current period other comprehensive gain (loss) | (1) | 5
Accumulated Other Comprehensive Income (Loss) |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (8) | 0
Ending balance | (9) | 5
Accumulated Other Comprehensive Income (Loss) | Pension Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (28) | (12)
Ending balance | (28) | (12)
Accumulated Other Comprehensive Income (Loss) | Other Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | 18 | 18
Ending balance | 18 | 18
Accumulated Other Comprehensive Income (Loss) | Customer Credit Trust |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | 2 | (6)
Ending balance | 1 | (1)
Amortization of prior service cost |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amounts reclassified from other comprehensive income | (1) | 0
Amortization of prior service cost | Pension Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amount attributable to tax, reclassification | 0 | 0
Amounts reclassified from other comprehensive income | (1) | (1)
Amortization of prior service cost | Other Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amount attributable to tax, reclassification | 0 | 0
Amounts reclassified from other comprehensive income | 0 | 1
Amortization of prior service cost | Customer Credit Trust |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amount attributable to tax, reclassification | 0 | 0
Amounts reclassified from other comprehensive income | 0 | 0
Amortization of net actuarial gain (loss) |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amounts reclassified from other comprehensive income | (4) | (4)
Amortization of net actuarial gain (loss) | Pension Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amount attributable to tax, reclassification | 0 | 0
Amounts reclassified from other comprehensive income | 0 | 0
Amortization of net actuarial gain (loss) | Other Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amount attributable to tax, reclassification | 1 | 1
Amounts reclassified from other comprehensive income | (4) | (4)
Amortization of net actuarial gain (loss) | Customer Credit Trust |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amount attributable to tax, reclassification | 0 | 0
Amounts reclassified from other comprehensive income | 0 | 0
Regulatory account transfer |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amounts reclassified from other comprehensive income | 5 | 4
Regulatory account transfer | Pension Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amount attributable to tax, reclassification | 0 | 0
Amounts reclassified from other comprehensive income | 1 | 1
Regulatory account transfer | Other Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amount attributable to tax, reclassification | 1 | 1
Amounts reclassified from other comprehensive income | 4 | 3
Regulatory account transfer | Customer Credit Trust |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amount attributable to tax, reclassification | 0 | 0
Amounts reclassified from other comprehensive income | $ 0 | $ 0

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