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Consolidated Statement of Comprehensive (Loss) Income (Parentheticals) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] |  |  |
Other comprehensive income (loss), tax | $ 0 | $ 1 | $ (2)

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