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Investments Investment Segment (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Schedule of Investments [Line Items]          
Investments $ 9,437   $ 9,437   $ 8,337
Securities sold, not yet purchased, at fair value 223   223   468
Investment Segment          
Schedule of Investments [Line Items]          
Investments 8,718   8,718   6,867
Securities sold, not yet purchased, at fair value 223   223   468
Unrealized gain (loss) on debt and equity securities still held (513) $ (4) (99) $ 356  
Investment Segment | Equity securities:          
Schedule of Investments [Line Items]          
Investments 8,549   8,549   6,686
Investment Segment | Corporate debt securities          
Schedule of Investments [Line Items]          
Investments 169   169   181
Investment Segment | Basic materials | Equity securities:          
Schedule of Investments [Line Items]          
Investments 262   262   414
Investment Segment | Consumer, non-cyclical | Equity securities:          
Schedule of Investments [Line Items]          
Investments 1,704   1,704   2,161
Securities sold, not yet purchased, at fair value 12   12   57
Investment Segment | Consumer, cyclical | Equity securities:          
Schedule of Investments [Line Items]          
Investments 2,149   2,149   1,161
Securities sold, not yet purchased, at fair value 93   93   106
Investment Segment | Energy | Equity securities:          
Schedule of Investments [Line Items]          
Investments 1,943   1,943   1,598
Securities sold, not yet purchased, at fair value 118   118   305
Investment Segment | Financial | Equity securities:          
Schedule of Investments [Line Items]          
Investments 264   264   167
Investment Segment | Technology | Equity securities:          
Schedule of Investments [Line Items]          
Investments 2,092   2,092   1,040
Investment Segment | Other | Equity securities:          
Schedule of Investments [Line Items]          
Investments $ 135   $ 135   145
Hertz | Investment Segment          
Schedule of Investments [Line Items]          
Ownership percentage in investment measured at fair value that would otherwise be accounted for under equity method 23.50%   23.50%    
Unrealized gain (loss) on equity method investments under fair value option $ (29) 23 $ 39 (135)  
Fair value of equity method investment under fair value option $ 462   $ 462   320
Herbalife | Investment Segment          
Schedule of Investments [Line Items]          
Ownership percentage in investment measured at fair value that would otherwise be accounted for under equity method 18.60%   18.60%    
Unrealized gain (loss) on equity method investments under fair value option $ (138) $ 23 $ (594) $ 740  
Fair value of equity method investment under fair value option $ 1,100   $ 1,100   $ 1,700
Caesars | Investment Segment          
Schedule of Investments [Line Items]          
Ownership percentage in investment measured at fair value that would otherwise be accounted for under equity method 13.50%   13.50%    
Unrealized gain (loss) on equity method investments under fair value option $ 26   $ 301    
Fair value of equity method investment under fair value option $ 1,100   $ 1,100