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Cash and cash equivalents and investment securities - Summary of Investments in Short-Term Debt Securities (Detail) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Disclosure of detailed information about borrowings [abstract] |  |
Investment in unquoted companies | $ 92 | $ 85
Investment in debt securities | 21 | 25
Non-current investments,Total | 113 | 110
Investment in debt securities | 102 | 92
Current investments,Total | $ 102 | $ 92

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