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Right-of-use assets and Lease liabilities - Maturity of Lease Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019
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Disclosure of maturity analysis of lease payments [Line Items] |  |
Total lease liabilities undiscounted | $ 449 |
Total lease liabilities | 341 | $ 286
Not later than one year [member] |  |
Disclosure of maturity analysis of lease payments [Line Items] |  |
Total lease liabilities undiscounted | 73 |
Total lease liabilities | 61 |
Between one and five years [member] |  |
Disclosure of maturity analysis of lease payments [Line Items] |  |
Total lease liabilities undiscounted | 176 |
Total lease liabilities | 140 |
Thereafter [member] |  |
Disclosure of maturity analysis of lease payments [Line Items] |  |
Total lease liabilities undiscounted | 200 |
Total lease liabilities | $ 140 |

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- Definition [Line Items] for Disclosure of maturity analysis of lease payments [Table] + References No definition available. + Details
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- Definition The amount of contractual undiscounted cash flows in relation to lease liabilities before deducting finance charges. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 58 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_58&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph B11D -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_B11D_a&doctype=Appendix&subtype=B -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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