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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 13,129 |  | $ 12,903 | $ 19,472
Net current period other comprehensive gain (loss) | 0 | $ 0 | 0 | (5)
Ending balance | 10,594 | 19,061 | 10,594 | 19,061
Pension Benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Net current period other comprehensive gain (loss) | 0 | 0 | 0 | (5)
Other Benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Net current period other comprehensive gain (loss) | 0 | 0 | 0 | 0
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (4) | (13) | (4) | (8)
Ending balance | (4) | (13) | (4) | (13)
Accumulated Other Comprehensive Income (Loss) | Pension Benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (21) | (30) | (21) | (25)
Ending balance | (21) | (30) | (21) | (30)
Accumulated Other Comprehensive Income (Loss) | Other Benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 17 | 17 | 17 | 17
Ending balance | 17 | 17 | 17 | 17
Amortization of prior service cost |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 1 | 1 | 3 | 3
Amortization of prior service cost | Pension Benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | (1) | (1) | (2) | (2)
Amount attributable to tax | 1 | 1 | 1 | 1
Amortization of prior service cost | Other Benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 2 | 2 | 5 | 5
Amount attributable to tax | 1 | 1 | 2 | 2
Amortization of net actuarial loss |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 0 | 0 | 0 | 0
Amortization of net actuarial loss | Pension Benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 0 | 1 | 1 | 2
Amount attributable to tax | 0 | 1 | 0 | 1
Amortization of net actuarial loss | Other Benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 0 | (1) | (1) | (2)
Amount attributable to tax | 1 | 1 | 1 | 1
Regulatory account transfer |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | (1) | (1) | (3) | (3)
Regulatory account transfer | Pension Benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | 1 | 0 | 1 | 0
Amount attributable to tax | 1 | 0 | 1 | 0
Regulatory account transfer | Other Benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income | (2) | (1) | (4) | (3)
Amount attributable to tax | $ 0 | $ 0 | $ 1 | 1
Reclassification of stranded income tax to retained earnings |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income |  |  |  | (5)
Reclassification of stranded income tax to retained earnings | Pension Benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income |  |  |  | (5)
Reclassification of stranded income tax to retained earnings | Other Benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from other comprehensive income |  |  |  | $ 0

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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