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Changes in Equity and Earnings per Share - Summary of Changes in Issued Capital and Treasury Shares (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of classes of share capital [line items] |  |  |
At the end of the previous year | 2,019,000,000 |  |
Changes during the period | 0 |  |
At the end of the current year | 2,019,000,000 | 2,019,000,000 |
Ordinary shares | 2,019,000,000 | 2,019,000,000 |
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 | $ 81 | $ 385 |
Ordinary shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
At the end of the current year | 1,737,000,000 |  |
Ordinary shares | 1,737,000,000 |  |
Treasury shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
At the end of the current year | 38,217,386 |  |
Ordinary shares | 38,217,386 |  |
Restricted shares | 282,107,042 | 325,999,817 |
At the end of the previous year | 47,000,000.0 |  |
Changes during the period | (8,800,000) |  |
At the end of the current year | 38,200,000 | 47,000,000.0 |
Result on the use of treasury shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
At the end of the previous year | $ (3,530) |  |
Changes during the period | (836) |  |
At the end of the current year | (4,366) | $ (3,530) |
Treasury shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
At the end of the previous year | (4,911) |  |
Changes during the period | 917 | 1,359 | $ 279
At the end of the current year | $ (3,994) | $ (4,911) |

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