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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Accumulated Other Comprehensive Income (Loss) Components (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Changes in derivative financial instruments, Net of taxes | $ 83 | $ 16 | $ 137 | $ 17
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Prior service credits | (1) | 0 | (1) | (1)
Net actuarial loss | 9 | 8 | 27 | 23
Total before taxes | 8 | 8 | 26 | 22
Amortization of pension and OPED liability, Income tax benefit | (2) | (2) | (6) | (4)
Amortization of pension and OPEB liability, Net of taxes | 6 | 6 | 20 | 18
Changed in derivative finanical instruments, commodity contracts | (13) | 4 | (19) | 11
Changes in derivative financial instruments, Income tax benefit | 3 | 0 | 4 | (2)
Changes in derivative financial instruments, Net of taxes | (10) | 4 | (15) | 9
Total reclassifications for the period, net of tax | $ (4) | $ 10 | $ 5 | $ 27

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