Income taxes - Income tax reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income taxes
Income (loss) before income taxes	$ (2,775)	$ 6,816	$ 7,829
Statutory rates (as a percent)	34.00%
Income taxes at statutory rate	$ 944	(2,317)	(2,662)
Adjustments that affect the basis of taxes:
Income tax benefit from interest on stockholders' equity	601	873	728
Tax incentives	189	576	372
Equity results	77	104	35
Additions of tax loss carryforward	25	1,510	99
Unrecognized tax losses of the year	(1,059)	(458)	(432)
Non-deductible effect of impairment		(24)	(43)
Others	(182)	(92)	408
Income taxes	$ 595	$ 172	$ (1,495)

The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)]

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The applicable income tax rate.

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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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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that the entity does not separately disclose in the same statement or note. [Refer: Accounting profit; Applicable tax rate]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to tax losses. [Refer: Accounting profit]

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The product of the accounting profit multiplied by the applicable tax rate(s). [Refer: Accounting profit; Applicable tax rate]

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to additions (reversals) of tax loss carryforward.

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to equity results.

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to interest on stockholders' equity.

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to nondeductible effect of impairment.

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to tax incentives.

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