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Consolidated Statement of Comprehensive Income (Loss) (Parantheticals) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]      
Other Comprehensive Income (Loss), Tax $ 1 $ (2) $ (8)