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Significant accounting policies (Details) $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 SFr / shares | Dec. 31, 2019 USD ($) | Apr. 08, 2019 USD ($)
Statement [line items] |  |  |  |  |  |
Par value per share | SFr / shares |  |  |  | SFr 0.50 |  |
Operating lease commitments |  | $ 3,612 |  |  |  |
New lease arrangements |  | (65) |  |  |  |
Undiscounted future lease payments | $ 3,283 |  |  |  |  |
Lease liabilities | 1,736 |  | $ 2,005 |  | $ 1,949 |
Discontinued operations [member] |  |  |  |  |  |
Statement [line items] |  |  |  |  |  |
Operating lease commitments, discontinued operations |  | $ 222 |  |  |  |
Lease liabilities | 286 |  |  |  |  | $ 269
Discontinued operations [member] | Previously stated [member] |  |  |  |  |  |
Statement [line items] |  |  |  |  |  |
Lease liabilities | $ 89 |  |  |  |  |

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- Definition The amount of contractual undiscounted cash flows in relation to lease liabilities before deducting finance charges. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 58 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_58&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph B11D -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_B11D_a&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_79_a_iii&doctype=Standard -URIDate 2019-03-27 + Details
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