| Acquisitions Pro Forma (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
| Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | |
| Business Acquisition [Line Items] | ||||
| Net earnings (loss) | $ 255 | $ 156 | $ 468 | $ 200 | 
| Formula 1 | ||||
| Business Acquisition [Line Items] | ||||
| Net earnings (loss) | 27 | 194 | ||
| Amortization of Deferred Charges | 109 | 179 | ||
| Business Acquisition, Pro Forma Revenue | 2,140 | 3,536 | ||
| Business Acquisition, Pro Forma Net Income (Loss) | 185 | 154 | ||
| Net earnings (loss) attributable to Liberty stockholders | $ 123 | $ 27 | ||
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- Definition BusinessAcquisitionProFormaNetIncomeLossAttributableToCommonShareholders No definition available. 
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- Definition The amount of amortization of deferred charges applied against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Details 
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