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Income taxes - Changes in deferred tax (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Total |  |  |  |
Balance at beginning of period |  |  | $ 8,565 | $ 7,335
Effect in income statement | $ (872) | $ 181 | (1,167) | 1,177
Translation adjustment |  |  | 153 | (2,225)
Other comprehensive income |  |  | (198) | 1,886
Balance at end of period | 7,353 | 8,173 | 7,353 | 8,173
Assets |  |  |  |
Balance at beginning of period |  |  | 10,335 | 9,217
Effect in income statement |  |  | (1,130) | 1,121
Translation adjustment |  |  | 196 | (2,352)
Other comprehensive income |  |  | (63) | 1,818
Balance at end of period | 9,338 | 9,804 | 9,338 | 9,804
Liabilities |  |  |  |
Balance at beginning of period |  |  | 1,770 | 1,882
Effect in income statement |  |  | 37 | (56)
Translation adjustment |  |  | 43 | (127)
Other comprehensive income |  |  | 135 | (68)
Balance at end of period | $ 1,985 | $ 1,631 | $ 1,985 | $ 1,631

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2020-01-01 + Details
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