| Inventory, net (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | 
|---|---|---|
| Inventory Disclosure [Abstract] | ||
| Raw materials | $ 0 | $ 3 | 
| Finished goods | 13 | 13 | 
| Allowance for obsolescence | (3) | (5) | 
| Total inventory, net | $ 10 | $ 11 | 
| X | ||||||||||
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- References No definition available. 
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| X | ||||||||||
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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Definition Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Definition Amount of valuation reserve for inventory. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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