Financial instruments - Classes of financial liabilities instruments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Liabilities [abstract]
Non-current finance debt	$ 24,945	$ 26,423	$ 23,264
Non-current derivative financial instruments	1,173		1,207
Trade and other payables	10,450	8,335	8,369
Current finance debt	4,087	$ 3,532	2,463
Dividend payable	859		766
Current Derivative Financial Liabilities	462		352
Total	41,976		36,422
Non-financial liabilities [member]
Liabilities [abstract]
Non-current finance debt	3,191		0
Non-current derivative financial instruments	0		0
Trade and other payables	1,423		255
Current finance debt	1,148		0
Dividend payable	0		0
Current Derivative Financial Liabilities	0		0
Total	5,762		255
Amortised cost [member]
Liabilities [abstract]
Non-current finance debt	21,754		23,264
Non-current derivative financial instruments	0		0
Trade and other payables	9,027		8,115
Current finance debt	2,939		2,463
Dividend payable	859		766
Current Derivative Financial Liabilities	0		0
Total	34,580		34,608
Financial liabilities at fair value through profit or loss, category [member]
Liabilities [abstract]
Non-current finance debt	0		0
Non-current derivative financial instruments	1,173		1,207
Trade and other payables	0		0
Current finance debt	0		0
Dividend payable	0		0
Current Derivative Financial Liabilities	462		352
Total	$ 1,635		$ 1,559

The amount of current derivative financial liabilities. [Refer: Derivative financial liabilities]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of current dividend payables. [Refer: Dividend payables]

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The current portion of non-current borrowings. [Refer: Borrowings]

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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]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The non-current portion of non-current borrowings. [Refer: Borrowings]

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The amount of non-current derivative financial liabilities. [Refer: Derivative financial liabilities]

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The amount of trade payables and other payables. [Refer: Trade payables; Other payables]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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