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RECLASSIFICATIONS FROM OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |  |
Actuarial losses, net and prior service cost |  |  | $ 164 | $ 174 | $ 170
Income tax expense |  |  | 269 | 230 | 221
Net of tax |  |  | (1,276) | (980) | (784)
Interest expense |  |  | 144 | 159 | 156
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings |  | $ 59 |  |  |
Amount reclassified |  |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |  |
Actuarial losses, net and prior service cost |  |  | 9 |  |
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Amount reclassified |  |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |  |
Actuarial losses, net and prior service cost |  |  | 26 | 20 | 20
Income tax expense |  |  | (7) | (5) | (5)
Net of tax |  |  | 19 | 15 | 15
UK Window Group | Amount reclassified |  |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |  |
Actuarial losses, net and prior service cost | $ 14 |  |  |  |
Interest rate swaps | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amount reclassified |  |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |  |
Income tax expense |  |  | (1) | 0 | 0
Net of tax |  |  | 1 | 2 | 2
Interest expense |  |  | $ 2 | $ 2 | $ 2

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