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Finance income and finance costs - Summary of finance income and finance costs (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Finance Income Expense Explanatory [Abstract]      
Finance income from equity accounted units $ 4 $ 4 $ 7
Other finance income (including bank deposits, net investment in leases, and other financial assets) 137 296 242
Total finance income 141 300 249
Interest on:      
Financial liabilities at amortised cost (excluding lease liabilities) and associated derivatives (561) (816) (775)
Lease liabilities (50) (55) (2)
Fair value movements:      
Bonds designated as hedged items in fair value hedges (284) (185) 96
Derivatives designated as hedging instruments in fair value hedges 287 181 (73)
Loss on early redemption of bonds 0 0 (94)
Amounts capitalised 340 321 296
Total finance costs $ (268) $ (554) $ (552)