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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net $ 606 $ 70 $ 942 $ 98
Fair Value Option Securities - AFS        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Realized and unrealized gain (losses) AFS 260 (78) 608 70
Fair Value Option Securities - Liberty Broadband        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net 490   651  
Exchangeable Senior Debentures        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net (138) $ 148 (313) $ 28
Other Financial Instruments        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net $ (6)   $ (4)