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Accumulated Other Comprehensive Income - Reclassifications (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Other operating expenses $ (2,952) $ (3,133) $ (2,802)
Interest expense - other (1,033) (1,116) (1,005)
Income taxes (benefits) (213) (490) (1,715)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS 908 981 (1,724)
Reclassifications from AOCI | Gains & losses on cash flow hedges      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Income taxes (benefits) 0 (2) (4)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS 2 6 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 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 - other 2 7 8
Reclassifications from AOCI | Unrealized gains on AFS securities      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Investment income 0 (1) (40)
Reclassifications from AOCI | Defined benefit pension and OPEB plans      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Prior-service costs (29) (74) (74)
Income taxes (benefits) 8 19 28
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS $ (21) $ (55) $ (46)