Long-Term Debt - Fair Value of Debt (Details) - USD ($)
$ in Millions |
Jun. 30, 2019 |
Feb. 01, 2019 |
Dec. 31, 2018 |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |
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| Long-term debt, measured at fair value |
$ 2,723
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$ 2,487
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| Liberty Sirius XM Group | Sirius XM 3.875% Senior Notes due 2022 |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |
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| Debt instrument interest rate (as a percent) |
3.875%
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| Long-term debt, measured at fair value |
$ 1,005
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| Liberty Sirius XM Group | Sirius XM 4.625% Senior Notes Due 2023 |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |
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| Debt instrument interest rate (as a percent) |
4.625%
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| Long-term debt, measured at fair value |
$ 506
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| Liberty Sirius XM Group | Sirius XM 6% Senior Notes Due 2024 |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |
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| Debt instrument interest rate (as a percent) |
6.00%
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| Long-term debt, measured at fair value |
$ 1,546
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| Liberty Sirius XM Group | Sirius XM 5.375% Senior Notes Due 2025 |