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Income Taxes - Current and deferred (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income taxes
Current income taxes	$ (3,416)	$ (2,911)	$ (4,552)
Deferred income taxes	387	1,941	2,899
Total income taxes	$ (3,029)	$ (970)	$ (1,653)

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

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