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Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Financial instruments fair value gains
Fair value movements on equity investments	$ (174)	$ 38	$ (54)	$ 156
Reconciliation of changes in contingent liabilities in business combination
Contingent liabilities recognised in business combination at beginning of period			5,106	5,534
Settlements			(368)	(151)
Revaluations				38
Discount unwind			179	208
Contingent liabilities recognised in business combination at end of period	4,917	$ 5,629	4,917	$ 5,629
Diabetes Alliance
Reconciliation of changes in contingent liabilities in business combination
Contingent liabilities recognised in business combination at beginning of period			3,983
Settlements			(225)
Discount unwind			144
Contingent liabilities recognised in business combination at end of period	3,902		3,902
Increase/decrease in contingent consideration balance with increase/decrease in sales of 10% compared with current estimates	390		$ 390
The increase/decrease in sales estimates			10.00%
Other
Reconciliation of changes in contingent liabilities in business combination
Contingent liabilities recognised in business combination at beginning of period			$ 1,123
Settlements			(143)
Discount unwind			35
Contingent liabilities recognised in business combination at end of period	1,015		1,015
Interest-Bearing Loans and Borrowings
Financial instruments fair value gains
Total carrying value	18,984		18,984
Fair value	20,867		20,867
Other Investments
Financial instruments fair value gains
Fair value	2,181		2,181
Money market funds
Financial instruments fair value gains
Fair value	3,960		3,960
Loans | Instruments in a fair value hedge relationship
Financial instruments fair value gains
Fair value	342		342
Loans | Instruments designated at fair value through profit and loss
Financial instruments fair value gains
Fair value	337		337
Derivatives
Financial instruments fair value gains
Fair value	$ 321		321
Level 3
Financial instruments fair value gains
Fair value movements on equity investments			$ 50

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The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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The amount of other comprehensive income, before tax, related to gains (losses) from changes in the fair value of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Other comprehensive income, before tax]

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The amount of contingent liabilities recognised in a business combination that were settled. [Refer: Contingent liabilities recognised in business combination]

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