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Financial Instruments and Derivatives - Net Positions of Foreign Contracts (Details) - Mar. 31, 2019 - Cash Flow Hedging
₽ in Thousands, ₺ in Thousands, € in Thousands, £ in Thousands, zł in Thousands, kr in Thousands, Kč in Thousands, $ in Thousands, $ in Thousands, $ in Thousands
GBP (£)
SEK (kr)
COP ($)
CZK (Kč)
MXN ($)
CAD ($)
TRY (₺)
EUR (€)
PLN (zł)
RUB (₽)
purchase                    
Derivative [Line Items]                    
Net position, purchase (sell) £ 1,133   $ 12,928,059 Kč 34,652 $ 341,547 $ 46,690 ₺ 4,917   zł 50,222  
sell                    
Derivative [Line Items]                    
Net position, purchase (sell)   kr 2,180           € 13,542   ₽ 83,981