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Income taxes - Deferred income tax assets and liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Income Tax Disclosure [Abstract] |  |
Deferred income tax assets | $ 374 | $ 201
Deferred income tax liabilities | (33) | (37)
Net deferred income tax asset | $ 341 | $ 164

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