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Right-of-use assets and Lease liabilities - Reconciliation of Lease Commitments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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Leases [Abstract] |  |  |
Operating lease commitments |  |  | $ (222)
Effect of discounting |  |  | (21)
Operating leases discounted using the incremental borrowing rate |  |  | 201
Finance lease liabilities |  |  | $ 89
Recognition exemption for short term and low-value leases |  | $ (4) |
Lease liabilities | $ 341 | $ 286 |
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16 |  | 2.90% |

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- Definition Effect Of Discounting On Minimum Lease Payments Payable Under Noncancellable Operating Lease + References No definition available. + Details
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- Definition Leases [Abstract] + References No definition available. + Details
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- Definition Minimum Finance Lease Payments Payable, Net + References No definition available. + Details
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- Definition Minimum Lease Payments Payable Under Noncancellable Operating Lease, Gross + References No definition available. + Details
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- Definition Minimum Lease Payments Payable Under Noncancellable Operating Lease, Net + References No definition available. + Details
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- Definition The amount of the lease commitments for short-term leases accounted for applying paragraph 6 of IFRS 16. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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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 -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph C12 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_C12_a&doctype=Appendix&subtype=C -URIDate 2019-03-27 + Details
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