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Other financial assets (including non-quasi equity loans to equity accounted units) - Summary of other financial assets including non-quasi equity loans to equity accounted units (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure Of Other Assets [Abstract] |  |
Non-current derivative financial instruments | $ 468 | $ 238
Non-current equity shares and quoted funds | 53 | 45
Other non-current investments, including loans | 255 | 188
Non-current loans to equity accounted units | 38 | 39
Other financial assets (including loans to equity accounted units) | 814 | 510
Current derivative financial instruments | 88 | 29
Current equity shares and quoted funds | 77 | 91
Other current investments, including loans | 2,527 | 964
Other financial assets (including loans to equity accounted units) | 2,692 | 1,084
Derivative financial instruments | 556 | 267
Equity shares and quoted funds | 130 | 136
Other investments, including loans | 2,782 | 1,152
Loans to equity accounted units | 38 | 39
Total | $ 3,506 | $ 1,594

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