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BENEFIT PLANS - AMOUNTS RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Retirement Benefits [Abstract] |  |
Net actuarial loss | $ 191 | $ 156
Net prior service cost | (4) | (4)
Before tax AOCI | 187 | 152
Less: Deferred taxes | 48 | 39
Net of tax AOCI | $ 139 | $ 113

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