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Investment in Associates and Joint Ventures - Summary of Investments in Associates and Joint Ventures (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance | $ 104 | $ 141 |
Share of (losses)/gains | 3 | 1 | $ (3)
Ending balance | 110 | 104 | 141
Cost [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance | 140 | 178 |
Additions | 14 | 3 |
Share of (losses)/gains | (3) | (1) |
Dividends and distributions | (7) | (37) |
Exchange and other adjustments |  | (3) |
Exchange | 1 |  |
Ending balance | 145 | 140 | 178
Accumulated impairment [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance | (36) |  |
Exchange and other adjustments |  | (37) |
Exchange | 1 | 1 |
Ending balance | (35) | (36) |
Joint ventures [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance |  | 27 |
Ending balance |  |  | 27
Joint ventures [member] | Cost [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance |  | 27 |
Share of (losses)/gains |  | 5 |
Dividends and distributions |  | (32) |
Ending balance |  |  | 27
Associates [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance | 104 | 114 |
Ending balance | 110 | 104 | 114
Associates [member] | Cost [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance | 140 | 151 |
Additions | 14 | 3 |
Share of (losses)/gains | (3) | (6) |
Dividends and distributions | (7) | (5) |
Exchange and other adjustments |  | (3) |
Exchange | 1 |  |
Ending balance | 145 | 140 | $ 151
Associates [member] | Accumulated impairment [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance | (36) |  |
Exchange and other adjustments |  | (37) |
Exchange | 1 | 1 |
Ending balance | $ (35) | $ (36) |

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- Definition The amount of dividends received. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B12 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B12_a&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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- Definition The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2019-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_10&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 23 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_23_g&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_28_e&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph 39M -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_39M_b&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 82 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_82_c&doctype=Standard -URIDate 2019-03-27 + Details
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