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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

X

- 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
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-URIDate 2019-03-27

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X

- 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
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-IssueDate 2019-01-01
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-URIDate 2019-03-27

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X

- 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
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- References

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- References

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- References

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