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Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details)

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Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Mar. 09, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý
Cash equivalents $ 356 Ìý $ 655
Equity Securities 550 Ìý 2,275
Indemnification asset 85 $ 281 Ìý
Debt 1,385 Ìý 1,846
Proceeds from assets indemnification 133 Ìý Ìý
Fair Value, Inputs, Level 1 Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý
Cash equivalents 356 Ìý 655
Equity Securities 550 Ìý 2,275
Significant Other Observable Inputs (Level 2) Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý
Indemnification asset 85 Ìý Ìý
Debt $ 1,385 Ìý $ 1,846
1.75% Exchangeable Senior Debentures due 2046 Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý
Interest rate (as a percent) 1.75% Ìý Ìý
Debt instruments repurchased 417,759 Ìý Ìý
Debt instruments, repurchase amount $ 457 Ìý Ìý
Exchangeable debentures outstanding 332,241 Ìý Ìý
1.75% Exchangeable Senior Debentures due 2046 | GCI Liberty Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý
Proceeds from assets indemnification $ 133 Ìý Ìý