XML 55 R47.htm IDEA: XBRL DOCUMENT v3.20.2
Financial instruments disclosures - Summary of changes in fair value of Level 3 financial assets and financial liabilities (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2020
USD ($)
Disclosure of detailed information about financial instruments [line items]  
Adjustment on currency translation $ (298)
Level 3  
Disclosure of detailed information about financial instruments [line items]  
Opening balance 383
Adjustment on currency translation (12)
– net operating costs (17)
– net operating costs 48
Total unrealised gains transferred into other comprehensive income 175
Disposals/maturity of financial instruments (12)
Closing balance 565
Total gains included in the income statement for assets and liabilities held at period end $ 31