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Investments and Related Matters Investment Segment (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Schedule of Investments [Line Items]          
Investments $ 8,858   $ 8,858   $ 8,337
Securities sold, not yet purchased, at fair value 146   146   468
Investment Segment          
Schedule of Investments [Line Items]          
Investments 8,191   8,191   6,867
Securities sold, not yet purchased, at fair value 146   146   468
Unrealized gain on debt and equity securities still held (118) $ 345 434 $ 397  
Investment Segment | Equity securities:          
Schedule of Investments [Line Items]          
Investments 8,000   8,000   6,686
Securities sold, not yet purchased, at fair value 146   146   468
Investment Segment | Corporate debt securities          
Schedule of Investments [Line Items]          
Investments 191   191   181
Investment Segment | Basic materials | Equity securities:          
Schedule of Investments [Line Items]          
Investments 410   410   414
Investment Segment | Consumer, non-cyclical | Equity securities:          
Schedule of Investments [Line Items]          
Investments 1,752   1,752   2,161
Securities sold, not yet purchased, at fair value 42   42   57
Investment Segment | Consumer, cyclical | Equity securities:          
Schedule of Investments [Line Items]          
Investments 1,907   1,907   1,161
Securities sold, not yet purchased, at fair value 86   86   106
Investment Segment | Consumer, cyclical | Corporate debt securities          
Schedule of Investments [Line Items]          
Securities sold, not yet purchased, at fair value 0   0   0
Investment Segment | Energy | Equity securities:          
Schedule of Investments [Line Items]          
Investments 2,546   2,546   1,598
Securities sold, not yet purchased, at fair value 18   18   305
Investment Segment | Financial | Equity securities:          
Schedule of Investments [Line Items]          
Investments 241   241   167
Investment Segment | Technology | Equity securities:          
Schedule of Investments [Line Items]          
Investments 989   989   1,040
Investment Segment | Other | Equity securities:          
Schedule of Investments [Line Items]          
Investments $ 155   $ 155   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 23.10%   23.10%    
Unrealized gain (loss) on equity method investments under fair value option $ (27) (106) $ 68 (158)  
Fair value of equity method investment under fair value option $ 310   $ 310   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 $ (288) $ 173 $ (456) $ 717  
Fair value of equity method investment under fair value option $ 1,200   $ 1,200   $ 1,700
Caesars [Member] | Investment Segment          
Schedule of Investments [Line Items]          
Ownership percentage in investment measured at fair value that would otherwise be accounted for under equity method 11.80%   11.80%    
Unrealized gain (loss) on equity method investments under fair value option $ 249   $ 275    
Fair value of equity method investment under fair value option $ 939   $ 939