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Exceptional Items - Summary of Exceptional Items relating to UK portfolio (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Exceptional Items [line items] |  |  |
Derecognition of right-of-use assets and lease liabilities | $ 22 |  |
Provisions charged to the income statement (incl onerous contracts) | (34) | $ (43) |
Impairment charges [abstract] |  |  |
Property plant and equipment | (90) |  |
Other impairment charges | (226) | (131) |
Profit (loss) from operating activities | (153) | 630 | $ 582
Fair value gains on contingent purchase consideration | 13 | 27 | (4)
(Loss) profit before tax | (280) | 542 | 482
UK Portfolio [member] |  |  |
Disclosure Of Exceptional Items [line items] |  |  |
Derecognition of right-of-use assets and lease liabilities | 18 |  |
Exceptional items [member] |  |  |
Impairment charges [abstract] |  |  |
Goodwill |  | (49) |
Property plant and equipment | (90) |  |
Other impairment charges | (226) | (131) |
Profit (loss) from operating activities | (270) | (186) | (104)
Fair value gains on contingent purchase consideration | 21 | 38 |
(Loss) profit before tax | (263) | (148) | $ (104)
Exceptional items [member] | Cost of Sales [Member] |  |  |
Disclosure Of Exceptional Items [line items] |  |  |
Reorganisation costs | (8) |  |
Exceptional items [member] | Onerous Contracts Provisions [Member] |  |  |
Disclosure Of Exceptional Items [line items] |  |  |
Provisions charged to the income statement (incl onerous contracts) | (10) |  |
Exceptional items [member] | Right-of-use assets [member] |  |  |
Impairment charges [abstract] |  |  |
Impairment loss | (16) | (32) |
Exceptional items [member] | UK Portfolio [member] |  |  |
Disclosure Of Exceptional Items [line items] |  |  |
Derecognition of right-of-use assets and lease liabilities | 18 |  |
Impairment charges [abstract] |  |  |
Goodwill |  | (49) |
Property plant and equipment | (50) |  |
Other impairment charges | (50) | (81) |
Profit (loss) from operating activities | (46) | (81) |
Fair value gains on contingent purchase consideration | 21 | 38 |
(Loss) profit before tax | (25) | (43) |
Exceptional items [member] | UK Portfolio [member] | Cost of Sales [Member] |  |  |
Disclosure Of Exceptional Items [line items] |  |  |
Reorganisation costs | (4) |  |
Impairment charges [abstract] |  |  |
Profit (loss) from operating activities | 4 |  |
Exceptional items [member] | UK Portfolio [member] | Onerous Contracts Provisions [Member] |  |  |
Disclosure Of Exceptional Items [line items] |  |  |
Provisions charged to the income statement (incl onerous contracts) | $ (10) |  |
Exceptional items [member] | UK Portfolio [member] | Right-of-use assets [member] |  |  |
Impairment charges [abstract] |  |  |
Impairment loss |  | $ (32) |

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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of impairment loss or reversal of impairment loss recognised in profit or loss. [Refer: Impairment loss recognised in profit or loss; Reversal of impairment loss recognised in profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_99&doctype=Standard -URIDate 2020-01-01 + Details
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