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Equity - Additional Information (Detail) shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 $ / shares shares | Dec. 31, 2016 $ / shares shares
Disclosure of classes of share capital [line items] |  |
Common shares par value | $ / shares | $ 10 | $ 10
Shares allocated for exercise of employee stock options | 500,000,000 | 500,000,000
Issued capital | 25,930.3 | 25,930.3
Legal capital reserve percentage |  | 10.00%
Percentage of paid in capital on reserve used to offset deficit or distribute as dividend in cash or stock | 25.00% |
Top of range [member] |  |
Disclosure of classes of share capital [line items] |  |
Total distribution | 50.00% |
American Depositary Shares (one represents five common shares) [member] |  |
Disclosure of classes of share capital [line items] |  |
Issued capital | 1,068.2 |
Number of shares issued | 5,340.8 |

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