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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Statement of Comprehensive Income [Abstract] |  |  |  |
NET INCOME (LOSS) | $ 391 | $ (458) | $ 1,023 | $ 1,210
OTHER COMPREHENSIVE INCOME (LOSS): |  |  |  |
Pension and OPEB prior service costs | (7) | (18) | (21) | (55)
Amortized losses on derivative hedges |  | 2 |  | 19
Amortized losses on derivative hedges | 0 |  | 1 |
Change in unrealized gains on AFS securities | 0 | 0 | 0 | (106)
Other comprehensive loss | (7) | (16) | (20) | (142)
Income tax benefits on other comprehensive loss | (3) | (4) | (6) | (61)
Other comprehensive loss, net of tax | (4) | (12) | (14) | (81)
COMPREHENSIVE INCOME (LOSS) | $ 387 | $ (470) | $ 1,009 | $ 1,129

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