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Exceptional items - Summary of Tax Impacts On Exceptional Items (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | $ 34 | $ 159 | $ 95
Deferred tax expense | (54) | (3) | 37
Total current and deferred tax | (20) | 156 | 132
Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | 14 | 4 | 21
Deferred tax expense | 38 | 16 | 1
Total current and deferred tax | 52 | 20 | 27
Derecognition of right-of-use assets and lease liabilities | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Deferred tax expense | (4) |  |
Provision for onerous contractual expenditure | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Deferred tax expense | 2 |  |
Reorganisation costs | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | 3 | 4 | 11
Deferred tax expense | 2 |  |
Acquisition and integration costs | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | 1 |  | 2
Litigation | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense |  |  | 5
Deferred tax expense |  | 6 |
Pension settlement cost | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense |  |  | 5
Deferred tax expense |  |  | 1
Impairment of financial assets | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | 4 |  |
Deferred tax expense | 2 |  |
Other impairment charges | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense | 6 |  |
Deferred tax expense | 37 | 18 |
Financial Expenses [Member] | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Deferred tax expense | 3 |  |
Fair value gains on contingent purchase consideration | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Deferred tax expense | $ (4) | (6) |
Adjustments in respect of prior years | Exceptional Items [member] |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |
Current tax expense |  |  | $ (2)
Deferred tax expense |  | $ (2) |

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