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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |
NET INCOME (LOSS) | $ 912 | $ 1,348 | $ (1,724)
OTHER COMPREHENSIVE INCOME (LOSS): |  |  |
Pension and OPEB prior service costs | (31) | (83) | (85)
Amortized losses on derivative hedges | 2 | 21 | 10
Change in unrealized gains on available-for-sale securities | 0 | (106) | 22
Other comprehensive income (loss) | (29) | (168) | (53)
Income tax benefits on other comprehensive loss | (8) | (67) | (21)
Other comprehensive loss, net of tax | (21) | (101) | (32)
COMPREHENSIVE INCOME (LOSS) | $ 891 | $ 1,247 | $ (1,756)

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