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RECLASSIFICATIONS FROM OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |
Reclassification from AOCI, Current Period, Tax | $ 59 |  |  |
Income from cash and cash investments and short-term bank deposits |  | $ (5) | $ (4) | $ (4)
Income tax expense |  | 258 | 304 | 296
Other nonoperating income (expense) |  | (13) | (32) | (26)
Net income available to common shareholders |  | 727 | 528 | 487
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |
Reclassification from accumulated other comprehensive income, before tax |  | 20 | 86 | 19
Reclassification from AOCI, Current Period, Tax |  | (5) | (13) | (7)
Reclassification from accumulated other comprehensive income, net of tax |  | 15 | 73 | 12
Accumulated Other Comprehensive Income (Loss) - Interest rate swaps | Amount reclassified |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |
Income tax expense |  | 0 | (1) | (1)
Net income available to common shareholders |  | 2 | 3 | 1
Accumulated Other Comprehensive Income (Loss) - Available -for-Sale Securities | Amount reclassified |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |
Income tax expense |  | 0 | 0 | (15)
Other nonoperating income (expense) |  | 0 | 0 | (3)
Net income available to common shareholders |  | 0 | 0 | 12
Federal |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |
Disproportionate Tax Effect in OCI |  |  |  | 14
Interest Rate Swaps | Accumulated Other Comprehensive Income (Loss) - Interest rate swaps | Amount reclassified |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |
Income from cash and cash investments and short-term bank deposits |  | $ 2 | $ 4 | $ 2

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