Financial Instruments - Fair Value Measurement (Details) - DKK (kr) kr in Millions	Jun. 30, 2021	Dec. 31, 2020
Reconciliation of changes in fair value measurement, assets [abstract]
Financial assets	kr (9,151)	kr (9,900)
Marketable Securities
Reconciliation of changes in fair value measurement, assets [abstract]
Financial assets	8,398	8,819
Marketable Securities \| Level 1
Reconciliation of changes in fair value measurement, assets [abstract]
Financial assets	8,398	8,819
Other Investments
Reconciliation of changes in fair value measurement, assets [abstract]
Financial assets	753	1,081
Other Investments \| Level 1
Reconciliation of changes in fair value measurement, assets [abstract]
Financial assets	729	1,067
Other Investments \| Level 3
Reconciliation of changes in fair value measurement, assets [abstract]
Financial assets	kr 24	kr 14

- Definition

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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