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Financial instruments - Activity in level 3 financial assets (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Changes in fair value measurement, assets [abstract]
Balance as of January 1	$ 729
Balance as of June 30	754
Fund investments [member] | Level 3 of fair value hierarchy [member]
Changes in fair value measurement, assets [abstract]
Balance as of January 1	27	$ 25
Additions	0	0
Cash receipts and payments	0	(5)
Gains/(losses) recognized in consolidated statement of comprehensive income	0	0
Unrealized gains/(losses) in income statement	(2)	49
Reclassification	0	0
Balance as of June 30	25	69
Financial investments measured at FVOCI [member] | Level 3 of fair value hierarchy [member]
Changes in fair value measurement, assets [abstract]
Balance as of January 1	19	26
Additions	8	11
Cash receipts and payments	0	0
Gains/(losses) recognized in consolidated statement of comprehensive income	(7)	0
Unrealized gains/(losses) in income statement	0	0
Reclassification	2	5
Balance as of June 30	$ 22	$ 42

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Reclassification, Fair Value Measurement, Assets

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) 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 receive 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 the entity’s own equity instruments do not include puttable financial instruments 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. [Refer: Financial instruments, class [member]; Financial liabilities]

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The gains (losses) recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income]

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The gains (losses) recognised in profit or loss on the fair value measurement of assets. [Refer: At fair value [member]]

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The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]]

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The decrease in the fair value measurement of assets resulting from sales. [Refer: At fair value [member]]

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