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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS)/INCOME (parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of comprehensive income [abstract]
Fair value adjustments on marketable securities, tax expense (benefit)	$ 0	$ 0	$ 0
Actuarial (losses)/gains from defined benefit plans, tax expense (benefit)	(11,000,000)	2,000,000	26,000,000
Fair value adjustments on equity securities, tax expense (benefit)	$ (5,000,000)	$ 0	$ 0

X

- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to available-for-sale financial assets. [Refer: Financial assets available-for-sale; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
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-URIDate 2019-03-27

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-Note Expiry date 2021-01-01
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X

- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Other comprehensive income; Reserve of gains and losses from investments in equity instruments]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2019-01-01
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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

+ References

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

No definition available.

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