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Operating segments - additional information - Summary of non-current assets other than excluded items (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Quasi equity loans [member]
Disclosure Of Geographical Areas [Line Items]
Quasi equity loans to equity accounted units	$ 129	$ 159
Non-quasi equity loan [member]
Disclosure Of Geographical Areas [Line Items]
Investments in equity accounted units	38	39
Non-current assets [member]
Disclosure Of Geographical Areas [Line Items]
Investments in equity accounted units	4,170	$ 4,327
France [member]
Disclosure Of Geographical Areas [Line Items]
Change in non-current assets other than excluded items	$ 182

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The amount of investments accounted for using equity method, excluding quasi equity loans (quasi-equity loans are long term loans to equity accounted units that in substance form part of the net investment and are reported in the line “Investments in equity accounted units” on the face of the balance sheet.

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Non Current Assets Other Than Excluded Items Increase Decrease

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The combined total of current and non-current non-quasi loans to equity accounted units classified as other financial assets.

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Quasi equity loans are long term loans to equity accounted units that in substance form part of the net investment and are reported in the line “Investments in equity accounted units” on the face of the balance sheet.

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