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Income taxes - Current and deferred (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income taxes
Current income taxes	$ (6,971)	$ (3,416)	$ (2,911)
Deferred income taxes	455	387	1,941
Total income taxes	$ (6,516)	$ (3,029)	$ (970)

- Definition

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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