Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value Realized Unrealized Gain Loss (Details)

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Assets and Liabilities Measured at Fair Value Realized Unrealized Gain Loss (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net (note 7) $ (27) $ 4 $ 92 $ 280
Fair Value Option Securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net (note 7) 10 130 154 552
Exchangeable Senior Debentures        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net (note 7) (52) (91) (9) (230)
Indemnification Assets        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net (note 7) $ 15   (49)  
Other Financial Instruments        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net (note 7)   $ (35) $ (4) $ (42)