Equity (Details 3) $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 SFr / shares	Dec. 31, 2019 SFr / shares	Dec. 31, 2018 SFr / shares
Statement of changes in equity [abstract]
Dividends payable, amount per share \| SFr / shares				SFr 2.95	SFr 2.85	SFr 2.80
Dividends recognised as distributions to owners \| $	$ 6,987	$ 6,645	$ 6,966

The amount of dividends recognised as distributions to owners.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 107
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_107&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_DividendsPaid
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration