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ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other operating expenses | $ (3,291) | $ (2,952) | $ (3,133)
Interest expense | (1,065) | (1,033) | (1,116)
Income taxes | (126) | (213) | (490)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS | 1,079 | 908 | 981
Reclassifications from AOCI | Gains & losses on cash flow hedges |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income taxes | 0 | 0 | (2)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS | 1 | 2 | 6
Reclassifications from AOCI | Gains & losses on cash flow hedges | Commodity contracts |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other operating expenses | 0 | 0 | 1
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | 1 | 2 | 7
Reclassifications from AOCI | Unrealized gains on AFS securities |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Discontinued operations | 0 | 0 | (1)
Reclassifications from AOCI | Defined benefit pension and OPEB plans |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Prior-service costs | (34) | (29) | (74)
Income taxes | 8 | 8 | 19
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS | $ (26) | $ (21) | $ (55)

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