Quarterly report pursuant to Section 13 or 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Accumulated Other Comprehensive Income (Loss) Components (Details)

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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