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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) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Transaction details [Line Items] Ìý Ìý
Consolidated Liberty $ 1,429 $ 1,114
Liberty Sirius XM Group Ìý Ìý
Transaction details [Line Items] Ìý Ìý
Debt securities 1,103 580
Consolidated Liberty 1,103 Ìý
Liberty Sirius XM Group | Pandora | Debt Securities Ìý Ìý
Transaction details [Line Items] Ìý Ìý
Debt securities 598 480
Liberty Sirius XM Group | iHeart Ìý Ìý
Transaction details [Line Items] Ìý Ìý
Principal amount of debt securities acquired during period 522 Ìý
Payments to acquire debt securities 389 Ìý
Debt security, principal balance 660 Ìý
Liberty Sirius XM Group | iHeart | Debt Securities Ìý Ìý
Transaction details [Line Items] Ìý Ìý
Debt securities 505 100
Braves Group Ìý Ìý
Transaction details [Line Items] Ìý Ìý
Other equity securities 8 8
Consolidated Liberty 8 Ìý
Braves Group | Other Equity Securities | Equity Securities Ìý Ìý
Transaction details [Line Items] Ìý Ìý
Other equity securities 8 8
Formula One Group Ìý Ìý
Transaction details [Line Items] Ìý Ìý
Equity securities 318 526
Consolidated Liberty 318 Ìý
Formula One Group | AT&T | Equity Securities Ìý Ìý
Transaction details [Line Items] Ìý Ìý
Equity securities 196 389
Formula One Group | Other Equity Securities | Equity Securities Ìý Ìý
Transaction details [Line Items] Ìý Ìý
Equity securities $ 122 $ 137