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Equity and Remuneration to Shareholders - Summary of Shares used in Calculation of Basic Profit and Diluted Earnings per Share (Detail) - shares | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Earnings per share [line items] |  |  |
Number of shares outstanding | 1,458,191,883 | 1,258,280,936 | 1,258,280,936
Common shares [member] |  |  |
Earnings per share [line items] |  |  |
Common shares already paid up | 420,764,708 | 420,764,708 | 420,764,708
Common shares to be paid up | 66,849,505 |  |
Shares in treasury | (69) | (69) | (69)
Number of shares outstanding | 487,614,144 | 420,764,639 | 420,764,639
Preference shares [member] |  |  |
Earnings per share [line items] |  |  |
Common shares already paid up | 838,076,946 | 838,076,946 | 838,076,946
Common shares to be paid up | 133,061,442 |  |
Shares in treasury | (560,649) | (560,649) | (560,649)
Number of shares outstanding | 970,577,739 | 837,516,297 | 837,516,297

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