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Quarterly report pursuant to Section 13 or 15(d)

Investments in Debt and Equity Securities - Summary (Details)

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Investments in Debt and Equity Securities - Summary (Details)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 23, 2018
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Transaction details [Line Items] Ìý Ìý Ìý
Consolidated Liberty Ìý $ 1,406 $ 1,114
SIRIUS XM Ìý Ìý Ìý
Business acquisition Ìý Ìý Ìý
Common stock, par or stated value per share | $ / shares $ 0.001 Ìý Ìý
SIRIUS XM | Pandora Ìý Ìý Ìý
Business acquisition Ìý Ìý Ìý
Initial value of all-stock transaction $ 3,500 Ìý Ìý
Common stock, par or stated value per share | $ / shares $ 0.0001 Ìý Ìý
Number of shares of common stock issued for each share of acquired entity's stock 1.44 Ìý Ìý
Liberty Sirius XM Group Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý
Debt securities Ìý 1,050 580
Consolidated Liberty Ìý 1,050 Ìý
Liberty Sirius XM Group | Pandora | Debt Securities Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý
Debt securities Ìý 554 480
Liberty Sirius XM Group | iHeart Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý
Principal amount of debt securities acquired during period Ìý 522 Ìý
Payments to acquire debt securities Ìý 389 Ìý
Debt security, principal balance Ìý 660 Ìý
Liberty Sirius XM Group | iHeart | Debt Securities Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý
Debt securities Ìý 496 100
Braves Group Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý
Other equity securities Ìý 8 8
Consolidated Liberty Ìý 8 Ìý
Braves Group | Other Equity Securities | Equity Securities Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý
Other equity securities Ìý 8 8
Formula One Group Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý
Other equity securities Ìý 348 526
Consolidated Liberty Ìý 348 Ìý
Formula One Group | AT&T | Equity Securities Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý
Equity securities Ìý 205 389
Formula One Group | Other Equity Securities | Equity Securities Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý
Other equity securities Ìý $ 143 $ 137