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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, 2019
Dec. 31, 2018
Disclosure Of Other Assets [Abstract]    
Non-current derivative financial instruments $ 308 $ 468
Non-current equity shares and quoted funds 52 53
Other non-current investments, including loans 236 255
Non-current loans to equity accounted units 39 38
Current derivative financial instruments 58 88
Current equity shares and quoted funds 9 77
Other current investments, including loans 2,603 2,527
Derivative financial assets 366 556
Equity shares and quoted funds 61 130
Other investments, including loans 2,839 2,782
Loans to equity accounted units 39 38
Other financial assets 635 814
Other financial assets 2,670 2,692
Other financial assets $ 3,305 $ 3,506