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Performance B.6.1 Income tax expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income tax (charge) credit |  |  |  |  |
Withholding tax | $ (64) | $ (74) |  | $ (44) |
Other income tax relating to the current year | (86) | (85) |  | (74) |
Current tax expense (income) | (150) | (159) |  | (118) |
Adjustments in respect of prior years | 1 | (12) |  | (26) |
Current tax expense (income) and adjustments | (149) | (171) |  | (144) |
Deferred tax (charge) credit |  |  |  |  |
Origination and reversal of temporary differences | 32 | 15 |  | 45 |
Effect of change in tax rates | (10) | 19 |  | 1 |
Tax income (expense) before valuation allowances | 22 | 34 |  | 46 |
Effect of valuation allowances | (8) | (30) |  | (88) |
Deferred tax expense (income) | 14 | 4 |  | (42) |
Adjustments in respect of prior years | 19 | 9 |  | 7 |
Deferred tax expense (income) and adjustments | 33 | 13 |  | (35) |
Income Tax Calculation: |  |  |  |  |
Profit before tax | 129 | 176 |  | 109 |
Tax at the weighted average statutory rate | (5) | (12) |  | 9 |
Effect of: |  |  |  |  |
Items taxed at a different rate | 7 | (11) |  | 13 |
Change in tax rates on deferred tax balances | (10) | 19 |  | 1 |
Expenditure not deductible and income not taxable | (59) | (66) |  | (65) |
Unrelieved withholding tax | (64) | (73) |  | (43) |
Accounting for associates and joint ventures | 5 | 17 |  | 29 |
Movement in deferred tax on unremitted earnings | (2) | 1 |  | (16) |
Unrecognized deferred tax assets | (8) | (31) |  | (105) |
Recognition of previously unrecognized deferred tax assets | 0 | 1 |  | 17 |
Adjustments in respect of prior years | 20 | (3) |  | (19) |
Total tax (charge) credit | $ (116) | $ (158) | [1] | $ (179) | [1]
Weighted average statutory tax rate | 3.90% | 6.82% |  | (8.26%) |
Effective tax rate | 89.90% | 89.77% |  | 164.22% |
Discontinued operations |  |  |  |  |
Income Tax Calculation: |  |  |  |  |
Profit before tax | $ (39) | $ 51 |  | $ (26) |
Tax at the weighted average statutory rate | 4 | (10) |  | 6 |
Effect of: |  |  |  |  |
Items taxed at a different rate | 0 | 0 |  | 0 |
Change in tax rates on deferred tax balances | 0 | 0 |  | 0 |
Expenditure not deductible and income not taxable | (2) | 7 |  | 8 |
Unrelieved withholding tax | 0 | 0 |  | 0 |
Accounting for associates and joint ventures | 0 | 0 |  | 0 |
Movement in deferred tax on unremitted earnings | 0 | 0 |  | 0 |
Unrecognized deferred tax assets | (2) | (10) |  | (15) |
Recognition of previously unrecognized deferred tax assets | 0 | 13 |  | 0 |
Adjustments in respect of prior years | 0 | 0 |  | 7 |
Total tax (charge) credit | 0 | 0 |  | 6 |
Aggregate continuing and discontinued operations [member] |  |  |  |  |
Income Tax Calculation: |  |  |  |  |
Profit before tax | 90 | 227 |  | 83 |
Tax at the weighted average statutory rate | (1) | (22) |  | 15 |
Effect of: |  |  |  |  |
Items taxed at a different rate | 7 | (11) |  | 13 |
Change in tax rates on deferred tax balances | (10) | 19 |  | 1 |
Expenditure not deductible and income not taxable | (61) | (59) |  | (57) |
Unrelieved withholding tax | (64) | (73) |  | (43) |
Accounting for associates and joint ventures | 5 | 17 |  | 29 |
Movement in deferred tax on unremitted earnings | (2) | 1 |  | (16) |
Unrecognized deferred tax assets | (10) | (41) |  | (120) |
Recognition of previously unrecognized deferred tax assets | 0 | 14 |  | 17 |
Adjustments in respect of prior years | 20 | (3) |  | (12) |
Total tax (charge) credit | $ (116) | $ (158) |  | $ (173) |
Weighted average statutory tax rate | 1.10% | 9.69% |  | (17.90%) |
Effective tax rate | 128.90% | 69.60% |  | 207.10% |
Bottom of range |  |  |  |  |
Effect of: |  |  |  |  |
Weighted average statutory tax rate | 10.00% | 10.00% |  | 10.00% |
Top of range |  |  |  |  |
Effect of: |  |  |  |  |
Weighted average statutory tax rate | 40.00% | 40.00% |  | 40.00% |
[1] | Re-presented for discontinued operations (shown in note A.4.). Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.

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