Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value - Realized and Unrealized Gains (Losses) (Details)

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Assets and Liabilities Measured at Fair Value - Realized and Unrealized Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Realized and unrealized gains (losses) on financial instruments    
Realized and unrealized gains (losses) on financial instruments, net $ (138) $ (81)
Gain (loss) on changes in fair value 220 (29)
Cumulative amount of gain (loss) in change in fair value 391  
Equity securities    
Realized and unrealized gains (losses) on financial instruments    
Realized and unrealized gains (losses) on financial instruments, net (4) 5
Exchangeable senior debentures    
Realized and unrealized gains (losses) on financial instruments    
Realized and unrealized gains (losses) on financial instruments, net (50) (116)
Indemnification asset    
Realized and unrealized gains (losses) on financial instruments    
Realized and unrealized gains (losses) on financial instruments, net (22) 32
Other Financial Instruments    
Realized and unrealized gains (losses) on financial instruments    
Realized and unrealized gains (losses) on financial instruments, net $ (62) $ (2)