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Quarterly report pursuant to Section 13 or 15(d)

Investments in Debt and Equity Securities - Summary (Details)

v3.8.0.1
Investments in Debt and Equity Securities - Summary (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Transaction details [Line Items] Ìý Ìý
Consolidated Liberty $ 1,573 $ 1,114
Liberty Sirius XM Group Ìý Ìý
Transaction details [Line Items] Ìý Ìý
Debt securities 1,031 580
Consolidated Liberty 1,031 Ìý
Liberty Sirius XM Group | Pandora | Debt Securities Ìý Ìý
Transaction details [Line Items] Ìý Ìý
Debt securities 512 480
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 519 100
Braves Group Ìý Ìý
Transaction details [Line Items] Ìý Ìý
Other equity securities 8 8
Consolidated Liberty 8 Ìý
Braves Group | Other AFS 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 534 526
Consolidated Liberty 534 Ìý
Formula One Group | Time Warner Inc | Equity Securities Ìý Ìý
Transaction details [Line Items] Ìý Ìý
Equity securities 402 389
Formula One Group | Other AFS Securities | Equity Securities Ìý Ìý
Transaction details [Line Items] Ìý Ìý
Equity securities $ 132 $ 137