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Accumulated Other Comprehensive Income - Reclassifications (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operating expenses | $ (809) | $ (758) | $ (606) | $ (779) | $ (770) | $ (739) | $ (684) | $ (940) | $ (2,952) | $ (3,133) | $ (2,802)
Interest expense - other |  |  |  |  |  |  |  |  | (1,033) | (1,116) | (1,005)
Income taxes (benefits) | 68 | (107) | (81) | (93) | (35) | (121) | (101) | (233) | (213) | (490) | (1,715)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS | $ (111) | $ 391 | $ 308 | $ 315 | $ 128 | $ (512) | $ 134 | $ 1,213 | 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)

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