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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated Other Comprehensive Income (Loss) Components (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Changes in derivative financial instruments, Net of taxes | $ 47 | $ 4 | $ 54 | $ 1
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Prior service credits | 0 | (1) | 0 | (1)
Net actuarial loss | 9 | 8 | 18 | 15
Total before taxes | 9 | 7 | 18 | 14
Amortization of pension and OPED liability, Income tax benefit | (2) | (1) | (4) | (2)
Amortization of pension and OPEB liability, Net of taxes | 7 | 6 | 14 | 12
Changed in derivative finanical instruments, commodity contracts | (5) | 4 | (6) | 7
Changes in derivative financial instruments, Income tax benefit | 1 | (1) | 1 | (2)
Changes in derivative financial instruments, Net of taxes | (4) | 3 | (5) | 5
Total reclassifications for the period, net of tax | $ 3 | $ 9 | $ 9 | $ 17

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- Definition Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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