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ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Interest expense $ (1,141) $ (1,065) $ (1,033)
Income taxes (320) (126) (213)
Net income (loss) attributable to common stockholders 1,283 1,079 908
Reclassifications from AOCI | Gains & losses on cash flow hedges      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) attributable to common stockholders 1 1 2
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Interest expense 1 1 2
Reclassifications from AOCI | Defined benefit pension and OPEB plans      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Prior-service costs (14) (34) (29)
Income taxes 3 8 8
Net income (loss) attributable to common stockholders $ (11) $ (26) $ (21)