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Exceptional Items - Additional Information (Detail) € in Millions, £ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2020 GBP (£) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 GBP (£)
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Derecognition of right-of-use assets | $ (93) |  |  |  |  |
Derecognition of lease liabilities | 71 |  |  |  |  |
Gain on termination of lease | 30 |  |  |  |  |
Fair value gains/(losses) on contingent purchase consideration | 13 |  | $ 27 | $ (4) |  |
Repayments of bonds, notes and debentures | 290 |  |  |  |  |
Non-current assets | 2,796 |  | 3,259 | 2,912 |  |
Lease liabilities | 450 |  | 660 |  |  |
Provisions charged to income statement (incl onerous contracts) | 34 |  | 43 |  |  |
Impairment loss on financial assets | 88 |  | 8 | 17 |  |
Derecognition of right of use assets and lease liabilities | 22 |  |  |  |  |
EMEAA [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Impairment loss on financial assets | (9) |  |  |  |  |
Right-of-use assets [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Derecognition of right of use assets net book value | 49 |  |  |  |  |
Right-of-use assets [member] | EMEAA [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Impairment loss | $ 5 |  |  |  |  |
2022 Bonds [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Notional amount | £ |  |  |  |  |  | £ 400
Repayments of bonds, notes and debentures | £ |  | £ 227 |  |  |  |
Bond interest rate | 3.875% |  |  |  | 3.875% | 3.875%
Maturity date | October 08, 2022 | October 08, 2022 |  |  |  |
2024 Bonds [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Notional amount | € |  |  |  |  | € 500 |
Bond interest rate | 1.625% |  |  |  | 1.625% | 1.625%
Maturity date | October 08, 2024 | October 08, 2024 |  |  |  |
2028 Bonds [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Notional amount | £ |  |  |  |  |  | £ 400
Bond interest rate | 3.375% |  |  |  | 3.375% | 3.375%
Maturity date | October 08, 2028 | October 08, 2028 |  |  |  |
UK Portfolio [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Derecognition of right-of-use assets | $ 22 |  |  |  |  |
Derecognition of lease liabilities | 40 |  |  |  |  |
Non-current assets | 0 |  |  |  |  |
Lease liabilities | 0 |  |  |  |  |
Contingent consideration recognised as of acquisition date | 0 |  |  |  |  |
Derecognition of right of use assets and lease liabilities | 18 |  |  |  |  |
Exceptional items [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Fair value gains/(losses) on contingent purchase consideration | 21 |  | 38 |  |  |
Impairment on goodwill |  |  | 49 |  |  |
Impairment loss on financial assets | 48 |  |  |  |  |
Litigation settlement amount | 5 |  | 28 | 18 |  |
Exceptional items [member] | Cost of Sales [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Reorganisation costs | 8 |  |  |  |  |
Exceptional items [member] | Administrative Expenses [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Reorganisation costs | 19 |  | 20 | 56 |  |
Exceptional items [member] | Onerous Contracts Provisions [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Provisions charged to income statement (incl onerous contracts) | 10 |  |  |  |  |
Exceptional items [member] | EMEAA [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Litigation settlement amount | 14 |  |  |  |  |
Exceptional items [member] | Right-of-use assets [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Impairment loss | 16 |  | 32 |  |  |
Exceptional items [member] | UK Portfolio [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Fair value gains/(losses) on contingent purchase consideration | 21 |  | 38 |  |  |
Impairment on goodwill |  |  | 49 |  |  |
Derecognition of right of use assets and lease liabilities | 18 |  |  |  |  |
Exceptional items [member] | UK Portfolio [member] | Cost of Sales [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Reorganisation costs | 4 |  |  |  |  |
Exceptional items [member] | UK Portfolio [member] | Onerous Contracts Provisions [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Provisions charged to income statement (incl onerous contracts) | 10 |  |  |  |  |
Exceptional items [member] | UK Portfolio [member] | Right-of-use assets [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Impairment loss |  |  | 32 |  |  |
Gain on Lease Termination [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Derecognition of right-of-use assets | 60 |  |  |  |  |
Derecognition of lease liabilities | 90 |  |  |  |  |
Consultancy expense [member] | Exceptional items [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Reorganisation costs |  |  | 6 | 25 |  |
Severance Costs [member] | Exceptional items [member] | Cost of Sales [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Reorganisation costs |  |  | 8 | 18 |  |
System Fund [member] | Exceptional items [member] | Administrative Expenses [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Reorganisation costs | 20 |  | $ 28 | $ 47 |  |
SVC [Member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Impairment loss on financial assets | 33 |  |  |  |  |
Trade deposits and loans [member] |  |  |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |  |  |
Impairment loss on financial assets | $ 15 |  |  |  |  |

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