Leases - Narrative (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jan. 01, 2019
Disclosure of leases [Abstract]
Cash outflow for leases	$ 25
Repayment of lease liabilities	20	$ 0	$ 0
Lease finance costs paid	$ 5	$ 0	$ 0
Weighted average incremental borrowing rate (as a percentage)				5.96%

Disclosure of leases [Abstract]

No definition available.

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- Definition

Interest Paid On Leases Classified As Financing Activities

+ References

No definition available.

+ Details

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- Definition

The cash outflow for leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2019-01-01
-Name IFRS
-Number 16
-IssueDate 2018-01-01
-Paragraph 53
-Subparagraph g
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_53_g&doctype=Standard
-URIDate 2018-03-16

+ Details

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- Definition

The cash outflow for payment of finance lease liabilities, classified as financing activities. [Refer: Finance lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 7
-IssueDate 2018-01-01
-Paragraph 17
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-02&anchor=para_17_e&doctype=Standard&book=b
-URIDate 2018-03-16

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- Definition

The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2019-01-01
-Name IFRS
-Number 16
-IssueDate 2018-01-01
-Paragraph C12
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_C12_a&doctype=Appendix&seq=3
-URIDate 2018-03-16

+ Details

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