| Statement of cash flows [abstract] | |||
| Estado de Flujo de Efectivo por Servicio [partidas] | |||
| Cash flows from (used in) operating activities [abstract] | |||
| Classes of cash receipts from operating activities [abstract] | |||
| Receipts from sales of goods and rendering of services | |||
| Receipts from royalties, fees, commissions and other revenue | |||
| Receipts from contracts held for dealing or trading purposes | |||
| Receipts from premiums and claims, annuities and other policy benefits | |||
| Receipts from rents and subsequent sales of assets held for rental to others and subsequently held for sale | |||
| Other cash receipts from operating activities | |||
| Classes of cash payments from operating activities [abstract] | |||
| Payments to suppliers for goods and services | |||
| Payments from contracts held for dealing or trading purpose | |||
| Payments to and on behalf of employees | |||
| Payments for premiums and claims, annuities and other policy benefits | |||
| Payments to manufacture or acquire assets held for rental to others and subsequently held for sale | |||
| Other cash payments from operating activities | |||
| Cash flows from (used in) operations | |||
| Dividends paid, classified as operating activities | |||
| Dividends received, classified as operating activities | |||
| Interest paid, classified as operating activities | |||
| Interest received, classified as operating activities | |||
| Income taxes paid (refund), classified as operating activities | |||
| Other inflows (outflows) of cash, classified as operating activities | |||
| Cash flows from (used in) operating activities | |||
| Cash flows from (used in) investing activities [abstract] | |||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | |||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | |||
| Other cash receipts from sales of equity or debt instruments of other entities, classified as investing activities | |||
| Other cash payments to acquire equity or debt instruments of other entities, classified as investing activities | |||
| Other cash receipts from sales of interests in joint ventures, classified as investing activities | |||
| Other cash payments to acquire interests in joint ventures, classified as investing activities | |||
| Proceeds from sales of property, plant and equipment, classified as investing activities | |||
| Purchase of property, plant and equipment, classified as investing activities | |||
| Proceeds from sales of intangible assets, classified as investing activities | |||
| Purchase of intangible assets, classified as investing activities | |||
| Proceeds from sales of other long-term assets, classified as investing activities | |||
| Purchase of other long-term assets, classified as investing activities | |||
| Proceeds from government grants, classified as investing activities | |||
| Cash advances and loans made to other parties, classified as investing activities | |||
| Cash receipts from repayment of advances and loans made to other parties, classified as investing activities | |||
| Cash payments for futures contracts, forward contracts, option contracts and swap contracts, classified as investing activities | |||
| Cash receipts from futures contracts, forward contracts, option contracts and swap contracts, classified as investing activities | |||
| Dividends received, classified as investing activities | |||
| Interest paid, classified as investing activities | |||
| Interest received, classified as investing activities | |||
| Income taxes paid (refund), classified as investing activities | |||
| Other inflows (outflows) of cash, classified as investing activities | |||
| Cash flows from (used in) investing activities | |||
| Cash flows from (used in) financing activities [abstract] | |||
| Proceeds from changes in ownership interests in subsidiaries that do not result in loss of control | |||
| Payments from changes in ownership interests in subsidiaries that do not result in loss of control | |||
| Proceeds from issuing shares | |||
| Proceeds from issuing other equity instruments | |||
| Payments to acquire or redeem entity's shares | |||
| Payments of other equity instruments | |||
| Proceeds from borrowings, classified as financing activities | |||
| Repayments of borrowings, classified as financing activities | |||
| Payments of lease liabilities, classified as financing activities | |||
| Proceeds from government grants, classified as financing activities | |||
| Dividends paid, classified as financing activities | |||
| Interest paid, classified as financing activities | |||
| Income taxes paid (refund), classified as financing activities | |||
| Other inflows (outflows) of cash, classified as financing activities | |||
| Cash flows from (used in) financing activities | |||
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | |||
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||
| Effect of exchange rate changes on cash and cash equivalents | |||
| Increase (decrease) in cash and cash equivalents | |||
| Cash and cash equivalents | |||
| Cash and cash equivalents | |||