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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Net (income) loss attributable to the noncontrolling interest $ 2 $ (1)
Alliance Bernstein | Discontinued Operations    
Net (income) loss attributable to the noncontrolling interest   $ 155