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Provisions and other non-current liabilities - Product liability, governmental investigations and other legal matters provision movements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of changes in other provisions [abstract]
Less current portion	$ 0	$ (42)
Non-current provisions for product liabilities, governmental investigations and other legal matters at December 31	0	0
Warranty, governmental investigations and other legal proceedings provisions [member]
Reconciliation of changes in other provisions [abstract]
January 1	42	49	$ 9
Additions to provisions	0	1	55
Cash payments	(40)	(1)	(6)
Releases	(2)	(7)	(9)
December 31	0	42	49
Less current portion	0	(42)	(43)
Non-current provisions for product liabilities, governmental investigations and other legal matters at December 31	$ 0	$ 0	$ 6

X

- Definition

The amount recognised for new other provisions. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of non-current provisions other than provisions for employee benefits. [Refer: Non-current provisions]

+ References

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- Definition

The amount of provisions other than provisions for employee benefits. [Refer: Provisions]

+ References

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+ References

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- Definition

The amount used (ie incurred and charged against the provision) for other provisions. [Refer: Other provisions]

+ References

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The amount reversed for unused other provisions. [Refer: Other provisions]

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