| Statement of comprehensive income [abstract] | |||
| Profit (loss) | |||
| Other comprehensive income [abstract] | |||
| Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract] | |||
| Other comprehensive income, net of tax, gains (losses) from investments in equity instruments | |||
| Other comprehensive income, net of tax, gains (losses) on revaluation | |||
| Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans | |||
| Other comprehensive income, net of tax, change in fair value of financial liability attributable to change in credit risk of liability | |||
| Other comprehensive income, net of tax, gains (losses) on hedging instruments that hedge investments in equity instruments | |||
| Other comprehensive income that will not be reclassified to profit or loss, net of tax | |||
| Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] | |||
| Exchange differences on translation [abstract] | |||
| Gains (losses) on exchange differences on translation, net of tax | |||
| Reclassification adjustments on exchange differences on translation, net of tax | |||
| Other comprehensive income, net of tax, exchange differences on translation | |||
| Available-for-sale financial assets [abstract] | |||
| Gains (losses) on remeasuring available-for-sale financial assets, net of tax | |||
| Reclassification adjustments on available-for-sale financial assets, net of tax | |||
| Other comprehensive income, net of tax, available-for-sale financial assets | |||
| Cash flow hedges [abstract] | |||
| Gains (losses) on cash flow hedges, net of tax | |||
| Reclassification adjustments on cash flow hedges, net of tax | |||
| Amounts removed from equity and included in carrying amount of non-financial asset (liability) whose acquisition or incurrence was hedged highly probable forecast transaction, net of tax | |||
| Other comprehensive income, net of tax, cash flow hedges | |||
| Hedges of net investment in foreign operations [abstract] | |||
| Gains (losses) on hedges of net investments in foreign operations, net of tax | |||
| Reclassification adjustments on hedges of net investments in foreign operations, net of tax | |||
| Other comprehensive income, net of tax, hedges of net investments in foreign operations | |||
| Change in value of time value of options [abstract] | |||
| Gains (losses) on change in value of time value of options, net of tax | |||
| Reclassification adjustments on change in value of time value of options, net of tax | |||
| Other comprehensive income, net of tax, change in value of time value of options | |||
| Change in value of forward elements of forward contracts [abstract] | |||
| Gains (losses) on change in value of forward elements of forward contracts, net of tax | |||
| Reclassification adjustments on change in value of forward elements of forward contracts, net of tax | |||
| Other comprehensive income, net of tax, change in value of forward elements of forward contracts | |||
| Change in value of foreign currency basis spreads [abstract] | |||
| Gains (losses) on change in value of foreign currency basis spreads, net of tax | |||
| Reclassification adjustments on change in value of foreign currency basis spreads, net of tax | |||
| Other comprehensive income, net of tax, change in value of foreign currency basis spreads | |||
| Financial assets measured at fair value through other comprehensive income [abstract] | |||
| Gains (losses) on financial assets measured at fair value through other comprehensive income, net of tax | |||
| Reclassification adjustments on financial assets measured at fair value through other comprehensive income, net of tax | |||
| Amounts removed from equity and adjusted against fair value of financial assets on reclassification out of fair value through other comprehensive income measurement category, net of tax | |||
| Other comprehensive income, net of tax, financial assets measured at fair value through other comprehensive income | |||
| Other comprehensive income that will be reclassified to profit or loss, net of tax | |||
| Other comprehensive income | |||
| Comprehensive income | |||