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Income taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Income Tax Disclosure [Abstract] |  |
Deferred tax assets | $ 197 | $ 295
Deferred tax liabilities | (78) | (42)
Net deferred tax asset | $ 119 | $ 253

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