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Events subsequent to the December 31 consolidated balance sheet date (Details) $ in Billions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2020 SFr / shares | Dec. 31, 2019 USD ($)
Statement [line items] |  |  |
Dividends proposed | $ | $ 7.7 |  | $ 7.0
Subsequent Event [member] |  |  |
Statement [line items] |  |  |
Dividends proposed, cash per share | SFr / shares |  | SFr 3.00 |

X
- Definition The amount of dividends proposed or declared after the reporting period but before financial statements are authorised for issue. Such dividends are not recognised as a liability at the end of the reporting period because no obligation exists at that time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 137 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_137_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 10 -IssueDate 2019-01-01 -Paragraph 13 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=10&code=ifrs-tx-2019-en-r&anchor=para_13&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 137 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_137_a&doctype=Standard -URIDate 2019-03-27 + Details
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- References No definition available. + Details
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- Details
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