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

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The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill]

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The proportion of the voting rights in an associate held by the entity. [Refer: Associates [member]]

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The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments]

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Subsequent Events (Details) - USD ($) $ in Millions				1 Months Ended	3 Months Ended
Subsequent Events (Details) - USD ($) $ in Millions	Feb. 09, 2021	Feb. 01, 2021	Oct. 08, 2019	May 31, 2020	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsequent events
Undrawn committed bank facilities							$ 4,100
Intangible assets						$ 20,947	$ 20,833	$ 21,959
Viela Bio
Subsequent events
Ownership			29.00%	26.70%
Alexion Pharmaceuticals, Inc.
Subsequent events
Undrawn committed bank facilities						$ 17,500
Sale of commercial rights \| Crestor
Subsequent events
Consideration paid (received)	$ (320)
Intangible assets	$ 0
Major business combination \| Alexion Pharmaceuticals, Inc. \| Forecast
Subsequent events
Consideration paid (received)					$ 39,000
Alexion shareholders ownership of combined company					15.00%
Sale of ownership \| Viela Bio
Subsequent events
Ownership		26.70%
Sale of ownership \| Viela Bio \| Minimum
Subsequent events
Anticipated cash proceeds and profits		$ 760
Sale of ownership \| Viela Bio \| Maximum
Subsequent events
Anticipated cash proceeds and profits		$ 780