Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Realized and unrealized gains (losses) on financial instruments, net (note 6) $ 76 $ 145 $ 414
Equity Securities      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Realized and unrealized gains (losses) on financial instruments, net (note 6) 155 434 723
Exchangeable Senior Debentures      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Realized and unrealized gains (losses) on financial instruments, net (note 6) (3) (193) (308)
Indemnification Assets      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Realized and unrealized gains (losses) on financial instruments, net (note 6) (70)    
Other Financial Instruments      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Realized and unrealized gains (losses) on financial instruments, net (note 6) $ (6) $ (96) $ (1)