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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.