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Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
Assets and Liabilities Measured at Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Mar. 09, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý
Cash equivalents Ìý $ 310 Ìý $ 655
Equity Securities Ìý Ìý Ìý 2,275
Indemnification asset Ìý 79 $ 281 Ìý
Debt Ìý 1,334 Ìý 1,846
Indemnification payment from GCI Liberty, Inc. Ìý 133 Ìý Ìý
Fair Value, Inputs, Level 1 Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý
Cash equivalents Ìý 310 Ìý 655
Equity Securities Ìý Ìý Ìý 2,275
Significant Other Observable Inputs (Level 2) Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý
Indemnification asset Ìý 79 Ìý Ìý
Debt Ìý $ 1,334 Ìý $ 1,846
1.75% Exchangeable Senior Debentures due 2046 Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý
Interest rate (as a percent) Ìý 1.75% Ìý Ìý
Securities repurchased 417,759 Ìý Ìý Ìý
Debt Instrument, Repurchase Amount $ 457 Ìý Ìý Ìý
Exchangeable debenture securities outstanding Ìý 332,241 Ìý Ìý
1.75% Exchangeable Senior Debentures due 2046 | GCI Liberty Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý
Indemnification payment from GCI Liberty, Inc. $ 133 Ìý Ìý Ìý