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Related Party Transactions - Summary of Related Party Balances (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Related Party Transaction [Line Items] |  |
Related party current assets | $ 12 | $ 11
Related party long-term assets | 448 | 960
Related party current liabilities | 4 | 4
Related party long-term liabilities | 3 | 4
Equity Method Investee | Sirius XM Canada |  |
Related Party Transaction [Line Items] |  |
Related party current assets | 12 | 11
Related party long-term assets | 448 | 437
Related party current liabilities | 4 | 4
Related party long-term liabilities | $ 3 | $ 4

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