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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Reclassifications Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 30,937 | $ 25,983 | $ 30,401 | $ 25,292
Unrealized gain on investments | 7 |  | 14 | (1)
Net current period other comprehensive loss | 8 | 0 | 15 | (1)
Ending balance | 31,438 | 26,505 | 31,438 | 26,505
Pension Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Unrealized gain on investments | 0 |  | 0 | 0
Amount attributable to tax, before reclassification | 0 |  | 0 | 0
Net current period other comprehensive loss | 1 | 0 | 1 | 0
Other Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Unrealized gain on investments | 0 |  | 0 | 0
Amount attributable to tax, before reclassification | 0 |  | 0 | 0
Net current period other comprehensive loss | 0 | 0 | 0 | 0
Available for Sale Securities |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Unrealized gain on investments | 7 |  | 14 | (1)
Amount attributable to tax, before reclassification | 3 |  | 5 | 1
Net current period other comprehensive loss | 7 | 0 | 14 | (1)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (7) | (9) | (14) | (8)
Ending balance | 1 | (9) | 1 | (9)
Accumulated Other Comprehensive Income (Loss) | Pension Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (35) | (28) | (35) | (28)
Ending balance | (34) | (28) | (34) | (28)
Accumulated Other Comprehensive Income (Loss) | Other Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 18 | 18 | 18 | 18
Ending balance | 18 | 18 | 18 | 18
Accumulated Other Comprehensive Income (Loss) | Available for Sale Securities |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 10 | 1 | 3 | 2
Ending balance | 17 | 1 | 17 | 1
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 | 0 | 0
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 | (1) | 0 | (1) | (1)
Amount attributable to tax, reclassification | 0 | 0 | 0 | 0
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 | 1 | 1 | 1 | 1
Amount attributable to tax, reclassification | 0 | 0 | 0 | 0
Amortization of prior service cost | Available for Sale Securities |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 0 | 0 | 0 | 0
Amount attributable to tax, reclassification | 0 | 0 | 0 | 0
Amortization of net actuarial gain |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | (3) | (4) | (7) | (8)
Amortization of net actuarial gain | Pension Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 1 | 0 | 1 | 0
Amount attributable to tax, reclassification | 0 | 0 | 0 | 0
Amortization of net actuarial gain | Other Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | (4) | (4) | (8) | (8)
Amount attributable to tax, reclassification | 2 | 2 | 3 | 3
Amortization of net actuarial gain | Available for Sale Securities |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 0 | 0 | 0 | 0
Amount attributable to tax, reclassification | 0 | 0 | 0 | 0
Regulatory account transfer |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 4 | 3 | 8 | 8
Regulatory account transfer | Pension Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 1 | 0 | 1 | 1
Amount attributable to tax, reclassification | 0 | 0 | 0 | 0
Regulatory account transfer | Other Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 3 | 3 | 7 | 7
Amount attributable to tax, reclassification | 2 | 2 | 3 | 3
Regulatory account transfer | Available for Sale Securities |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 0 | 0 | 0 | 0
Amount attributable to tax, reclassification | $ 0 | $ 0 | $ 0 | $ 0

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