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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Reclassifications Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 31,438 | $ 26,505 | $ 30,401 | $ 25,292
Unrealized gain (loss) on investments | (4) | 4 | 10 | 3
Net current period other comprehensive gain (loss) | (4) | 4 | 11 | 3
Ending balance | 32,230 | 27,086 | 32,230 | 27,086
Pension Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Unrealized gain (loss) on investments | 0 | 0 | 0 |
Amount attributable to tax, before reclassification | 0 | 0 | 0 | 0
Net current period other comprehensive gain (loss) | 0 | 0 | 1 | 0
Other Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Unrealized gain (loss) on investments | 0 | 0 | 0 |
Amount attributable to tax, before reclassification | 0 | 0 | 0 | 0
Net current period other comprehensive gain (loss) | 0 | 0 | 0 | 0
Available for Sale Securities/Customer Credit Trust |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Unrealized gain (loss) on investments | (4) | 4 | 10 | 3
Amount attributable to tax, before reclassification | 1 | 2 | 4 | 1
Net current period other comprehensive gain (loss) | (4) | 4 | 10 | 3
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 1 | (9) | (14) | (8)
Ending balance | (3) | (5) | (3) | (5)
Accumulated Other Comprehensive Income (Loss) | Pension Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (34) | (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/Customer Credit Trust |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 17 | 1 | 3 | 2
Ending balance | 13 | 5 | 13 | 5
Amortization of prior service cost |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 0 | 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 | 0 | (1) | (1) | (2)
Amount attributable to tax, reclassification | 1 | 1 | 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 | 0 | 1 | 1 | 2
Amount attributable to tax, reclassification | 1 | 1 | 1 | 1
Amortization of prior service cost | Available for Sale Securities/Customer Credit Trust |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 0 | 0 | 0 |
Amount attributable to tax, reclassification | 0 | 0 | 0 | 0
Amortization of net actuarial loss (gain) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | (4) | (4) | (11) | (12)
Amortization of net actuarial loss (gain) | Pension Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 0 | 1 | 1 | 1
Amount attributable to tax, reclassification | 0 | 0 | 0 | 0
Amortization of net actuarial loss (gain) | Other Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | (4) | (5) | (12) | (13)
Amount attributable to tax, reclassification | 2 | 2 | 5 | 5
Amortization of net actuarial loss (gain) | Available for Sale Securities/Customer Credit Trust |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 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 | 4 | 12 | 12
Regulatory account transfer | Pension Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 0 | 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 | 4 | 4 | 11 | 11
Amount attributable to tax, reclassification | 1 | 1 | 4 | 4
Regulatory account transfer | Available for Sale Securities/Customer Credit Trust |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 0 | 0 | 0 |
Amount attributable to tax, reclassification | $ 0 | $ 0 | $ 0 | $ 0

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