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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Reclassifications Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | $ 25,292 | $ 23,075
Unrealized gain on investments | 1 | 8
Net current period other comprehensive income (loss) | (6) | (8)
Ending balance | 30,401 | 25,292
Pension Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Unrealized gain on investments | 0 | 0
Amount attributable to tax, before reclassification | 0 | 0
Net current period other comprehensive income (loss) | (7) | (16)
Other Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Unrealized gain on investments | 0 | 0
Amount attributable to tax, before reclassification | 0 | 0
Net current period other comprehensive income (loss) | 0 | 0
Customer Credit Trust |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Unrealized gain on investments | 1 | 8
Amount attributable to tax, before reclassification | 0 | 3
Net current period other comprehensive income (loss) | 1 | 8
Accumulated Other Comprehensive Income (Loss) |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (8) | 0
Ending balance | (14) | (8)
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 | (35) | (28)
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 | 3 | 2
Amortization of prior service cost |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amounts reclassified from other comprehensive income | 0 | (1)
Amortization of prior service cost | Pension Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amounts reclassified from other comprehensive income | (2) | (3)
Amount attributable to tax, reclassification | 1 | 1
Amortization of prior service cost | Other Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amounts reclassified from other comprehensive income | 2 | 2
Amount attributable to tax, reclassification | 1 | 1
Amortization of prior service cost | Customer Credit Trust |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Amounts reclassified from other comprehensive income | 0 | 0
Amount attributable to tax, reclassification | 0 | 0
Amortization of net actuarial gain |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications: | (239) | (123)
Amounts reclassified from other comprehensive income | (15) | (13)
Amortization of net actuarial gain | Pension Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications: | (268) | (196)
Other comprehensive income before reclassifications, tax | 104 | 76
Amounts reclassified from other comprehensive income | 1 | 1
Amount attributable to tax, reclassification | 0 | 0
Amortization of net actuarial gain | Other Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications: | 29 | 73
Other comprehensive income before reclassifications, tax | 11 | 28
Amounts reclassified from other comprehensive income | (16) | (14)
Amount attributable to tax, reclassification | 6 | 5
Amortization of net actuarial gain | Customer Credit Trust |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications: | 0 | 0
Other comprehensive income before reclassifications, tax | 0 | 0
Amounts reclassified from other comprehensive income | 0 | 0
Amount attributable to tax, reclassification | 0 | 0
Regulatory account transfer |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications: | 231 | 107
Amounts reclassified from other comprehensive income | 16 | 14
Regulatory account transfer | Pension Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications: | 260 | 180
Other comprehensive income before reclassifications, tax | 101 | 70
Amounts reclassified from other comprehensive income | 2 | 2
Amount attributable to tax, reclassification | 1 | 1
Regulatory account transfer | Other Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications: | (29) | (73)
Other comprehensive income before reclassifications, tax | 11 | 28
Amounts reclassified from other comprehensive income | 14 | 12
Amount attributable to tax, reclassification | 5 | 4
Regulatory account transfer | Customer Credit Trust |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications: | 0 | 0
Other comprehensive income before reclassifications, tax | 0 | 0
Amounts reclassified from other comprehensive income | 0 | 0
Amount attributable to tax, reclassification | $ 0 | $ 0

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