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, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Realized and unrealized gains (losses) on financial instruments, net $ 618 $ 1,175 $ 114
Fair Value Option Securities - AFS      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Realized and unrealized gains (losses) on financial instruments, net 434 723 84
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 473 761  
Exchangeable Senior Debentures      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Realized and unrealized gains (losses) on financial instruments, net (193) (308) $ 30
Other Financial Instruments      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Realized and unrealized gains (losses) on financial instruments, net $ (96) $ (1)