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RECLASSIFICATIONS FROM OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |
Income from cash and cash investments and short-term bank deposits |  | $ 4 | $ 4 | $ 3
Income tax expense |  | (305) | (296) | (293)
Net income available to common shareholders |  | 528 | 485 | 350
Other nonoperating income (expense) |  | (6) | 6 | 0
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 |  | 86 | 19 | 21
Accumulated Other Comprehensive Income (Loss) - Actuarial losses, net |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |
Reclassification from AOCI, Current Period, Tax |  | (13) | (7) | (8)
Reclassification from accumulated other comprehensive income, net of tax |  | 73 | 12 | 13
Accumulated Other Comprehensive Income (Loss) - Interest rate swaps | Amount reclassified |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |
Income tax expense |  | (1) | (1) | 0
Net income available to common shareholders |  | 3 | 1 | 2
Accumulated Other Comprehensive Income (Loss) - Available -for-Sale Securities | Amount reclassified |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |
Income tax expense |  | 0 | 15 | 0
Net income available to common shareholders |  | 0 | 12 | 0
Other nonoperating income (expense) |  | 0 | (3) | 0
Federal |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |
Income tax expense | $ 13 |  |  |
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 |  | $ 4 | $ 2 | $ 2

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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