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Note 21 - Changes in Equity - Diluted Earnings (Details) - shares shares in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Line Items [Line Items]
Issued shares at December 31, net of treasury shares (i) (in shares)	[1]	15,705.8	15,696.6	15,696.1
Effect of shares options (in shares)		132.2	126.5	124.0
Weighted average number of shares (diluted) at December 31 (in shares)		15,838.1	15,823.1	15,820.1
[1] Not considered treasury shares.

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- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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