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Contingencies and commitments (Sandoz Patent Litigation) (Details)	1 Months Ended
	Jun. 30, 2018 lawsuit
Sandoz Inc.
Gain Contingencies [Line Items]
Number of lawsuits filed	19

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- Definition

Gain Contingency, Number of Lawsuits Filed

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: