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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)