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Related party disclosures - Summary of Related Party Disclosures for Associates and Joint Ventures (Detail) - Associates - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of transactions between related parties [Line Items]      
Fee revenue $ 10 $ 12 $ 11
Expenses (1) 0 0
Amounts receivable (net) 50 41 19
Amounts payable $ (1) $ 0 $ (10)