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Changes in Equity and Earnings per Share - Summary of Changes in Issued Capital and Treasury Shares (Detail) - USD ($) shares in Millions, $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Disclosure of classes of share capital [line items] |  |  |
Ordinary shares | 2,019.0 |  | 2,019.0
At the end of the previous year | 2,019.0 |  |
Changes during the period | 0.0 |  |
At the end of the current year | 2,019.0 |  | 2,019.0
At the end of the previous year | $ 1,736 |  |
Changes during the period |  |  | $ 0
At the end of the current year | 1,736 |  | $ 1,736
Changes during the period | $ 340 | $ (4) |
At the end of the previous year | 59.9 |  |
Changes during the period | (11.8) |  |
At the end of the current year | 48.1 |  | 59.9
Ordinary shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Ordinary shares | 1,693.0 |  | 1,693.0
At the end of the previous year | 1,693.0 |  |
At the end of the current year |  |  | 1,693.0
Treasury shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Restricted shares | 326.0 |  |
Result on the use of treasury shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
At the end of the previous year | $ (2,556) |  |
Changes during the period | (897) |  |
At the end of the current year | (3,453) |  | $ (2,556)
Treasury shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
At the end of the previous year | (6,270) |  |
Changes during the period | 1,236 | $ 279 |
At the end of the current year | $ (5,034) |  | $ (6,270)

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