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Other financial assets - Summary of other financial assets including non-quasi equity loans to equity accounted units (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Other Assets [Abstract]    
Non-current derivative financial instruments $ 531 $ 308
Non-current equity shares and quoted funds 66 52
Other non-current investments, including loans 231 236
Non-current loans to equity accounted units 1 39
Current derivative financial instruments 134 58
Current equity shares and quoted funds 9 9
Other current investments, including loans 2,668 2,603
Current loans to equity accounted units 40 0
Derivative financial assets 665 366
Equity shares and quoted funds 75 61
Other investments, including loans 2,899 2,839
Loans to equity accounted units 41 39
Other financial assets, non-current 829 635
Other financial assets, current 2,851 2,670
Other financial assets $ 3,680 $ 3,305