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Other assets - Balance Sheet Presentation (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Other current assets | $ 186 | $ 158
Other non-current assets | 46 | 59
Total other assets | $ 232 | $ 217

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