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Performance B.6.1. Income tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Taxation [Line Items]      
Weighted average statutory tax rate 24.70% 25.20% 15.40%
Income tax (charge) credit      
Withholding tax $ (81) $ (75) $ (81)
Other income tax relating to the current year (256) (203) (170)
Adjustments in respect of prior years (24) (6) (10)
Total (361) (284) (261)
Deferred tax (charge) credit      
Origination and reversal of temporary differences (86) (3) 44
Effect of change in tax rates 0 1 1
Tax income (expense) before valuation allowances (86) (2) 45
(Increase)/decrease in unrecognised deferred tax assets and impairment 142 3 (209)
Total 56 1 (164)
Adjustments in respect of prior years 2 2 1
Deferred tax expense (income) and adjustments 58 3 (163)
Income Tax Calculation:      
Profit before tax 1,665 552 175
Tax at the weighted average statutory rate (411) (139) (27)
Effect of:      
Items taxed at a different rate (8) 29 10
Change in tax rates on deferred tax balances 0 1 1
Expenditure not deductible and income not taxable 37 (92) (121)
Unrelieved withholding tax (80) (74) (80)
Accounting for associates and joint ventures 31 16 13
Movement in deferred tax on unremitted earnings 8 (21) (2)
Unrecognized / recognized of previously unrecognized deferred tax assets 142 3 (209)
Adjustments in respect of prior years (22) (4) (9)
Tax expense $ (303) $ (281) $ (424)
Effective tax rate 18.20% 50.90% 242.30%
Discontinued operations      
Income Tax Calculation:      
Profit before tax $ 0 $ (3) $ 4
Tax at the weighted average statutory rate 0 1 (1)
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 0 (1) 1
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 / recognized of previously unrecognized deferred tax assets 0 0 0
Adjustments in respect of prior years 0 0 0
Tax expense $ 0 $ 0 $ 0
Aggregate continuing and discontinued operations      
Taxation [Line Items]      
Weighted average statutory tax rate 24.70% 25.10% 15.60%
Income Tax Calculation:      
Profit before tax $ 1,665 $ 549 $ 179
Tax at the weighted average statutory rate (411) (138) (28)
Effect of:      
Items taxed at a different rate (8) 29 10
Change in tax rates on deferred tax balances 0 1 1
Expenditure not deductible and income not taxable 37 (93) (120)
Unrelieved withholding tax (80) (74) (80)
Accounting for associates and joint ventures 31 16 13
Movement in deferred tax on unremitted earnings 8 (21) (2)
Unrecognized / recognized of previously unrecognized deferred tax assets 142 3 (209)
Adjustments in respect of prior years (22) (4) (9)
Tax expense $ (303) $ (281) $ (424)
Effective tax rate 18.20% 51.20% 236.90%
Bottom of range      
Taxation [Line Items]      
Weighted average statutory tax rate 10.00% 10.00%  
Top of range      
Taxation [Line Items]      
Weighted average statutory tax rate 35.00% 35.00%