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v3.25.1

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

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