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Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Statement [Abstract] |  |  |
Income (loss) from operations of discontinued businesses, income tax benefit (expense) | $ 0 | $ (2) | $ (21)
Gain (loss) from disposal of discontinued businesses, income tax benefit (expense) | $ 0 | $ (44) | $ 0

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