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Fair Value of Financial Assets and Liabilities-Sensitivity of level 3 instruments to changes in key assumptions of the input parameters for the valuation model (Details) - CLP ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value of Financial Assets and Liabilities
Financial Assets	$ 4,390,903	$ 2,719,900
Level 3
Fair Value of Financial Assets and Liabilities
Financial Assets	54,327	85,019
Sensitivity to changes in key assumptions of models	$ (443)	$ (1,431)
Reasonably possible change in risk assumption (as a percentage)	10.00%	10.00%
Financial assets held-for-trading | Level 3
Fair Value of Financial Assets and Liabilities
Financial Assets	$ 8,012	$ 8,960
Sensitivity to changes in key assumptions of models	$ (26)	$ (176)
Reasonably possible change in risk assumption (as a percentage)	10.00%	10.00%
Financial assets available-for-sale | Level 3
Fair Value of Financial Assets and Liabilities
Financial Assets	$ 46,315	$ 76,059
Sensitivity to changes in key assumptions of models	$ (417)	$ (1,255)
Reasonably possible change in risk assumption (as a percentage)	10.00%	10.00%
Other instruments issued in Chile | Financial assets held-for-trading | Level 3
Fair Value of Financial Assets and Liabilities
Financial Assets	$ 8,012	$ 8,960
Sensitivity to changes in key assumptions of models	$ (26)	$ (176)
Reasonably possible change in risk assumption (as a percentage)	10.00%	10.00%
Other instruments issued in Chile | Financial assets available-for-sale | Level 3
Fair Value of Financial Assets and Liabilities
Financial Assets	$ 46,265	$ 76,005
Sensitivity to changes in key assumptions of models	$ (417)	$ (1,255)
Reasonably possible change in risk assumption (as a percentage)	10.00%	10.00%
Instruments issued by foreign institutions | Financial assets available-for-sale | Level 3
Fair Value of Financial Assets and Liabilities
Financial Assets	$ 50	$ 54

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The reasonably possible change in the risk assumption used to calculate fair value. The positive and negative impacts are similar.

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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The amount of increase (decrease) in the fair value measurement of assets due to a change in one or more unobservable inputs to reflect reasonably possible alternative assumptions.

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