Capitalized Cost from Contracts with Customers (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Incremental Costs of Obtaining Customer Contracts
Capitalized contract cost, current	€ 583	€ 480
Capitalized contract cost, non-current	1,687	1,435
Assets recognised from costs to obtain or fulfil contracts with customers	2,270	1,915
Other current non-financial assets	1,321	1,188
Other non-current non-financial assets	1,926	1,701
Other non-financial assets	€ 3,247	€ 2,889
Capitalized contract cost as % of other non-financial assets, current	44.00%	40.00%
Capitalized contract cost as % of other non-financial assets, non-current	88.00%	84.00%
Capitalized contract cost as % of other non-financial assets	70.00%	66.00%
Capitalized cost of obtaining customer contracts
Incremental Costs of Obtaining Customer Contracts
Amortization period		18 months to eight years
Capitalized contract cost, current	€ 491	€ 414
Capitalized contract cost, non-current	1,536	1,318
Assets recognised from costs to obtain or fulfil contracts with customers	2,028	1,732
Amortization expenses of capitalized contract costs	€ 450	367
Incremental costs
Incremental Costs of Obtaining Customer Contracts
Amortization period	one year or less
Capitalized cost to fulfill customer contracts
Incremental Costs of Obtaining Customer Contracts
Amortization period	typically seven to eight years
Capitalized contract cost, current	€ 91	66
Capitalized contract cost, non-current	151	117
Assets recognised from costs to obtain or fulfil contracts with customers	242	183
Amortization expenses of capitalized contract costs	€ 129	€ 81

The amount of amortisation for assets recognised from the costs incurred to obtain or fulfil contracts with customers. [Refer: Assets recognised from costs to obtain or fulfil contracts with customers; Amortisation expense]

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The amount of assets recognised from the costs to obtain or fulfil contracts with customers. The costs to obtain a contract with a customer are the incremental costs of obtaining the contract that the entity would not have incurred if the contract had not been obtained. The costs to fulfil a contract with a customer are the costs that relate directly to a contract or to an anticipated contract that the entity can specifically identify.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The description of the method used to determine the amortisation of the assets recognised from the costs to obtain or fulfil contracts with customers. [Refer: Assets recognised from costs to obtain or fulfil contracts with customers]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The amount of current non-financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of non-current non-financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets]

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The amount of non-financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets]

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The current amount of assets recognised from the costs to obtain or fulfil contracts with customers. The costs to obtain a contract with a customer are the incremental costs of obtaining the contract that the entity would not have incurred if the contract had not been obtained. The costs to fulfil a contract with a customer are the costs that relate directly to a contract or to an anticipated contract that the entity can specifically identify.

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The percentage of current amount of assets recognised from the costs to obtain or fulfil contracts with customers to other current non-financial assets.

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The non-current amount of assets recognised from the costs to obtain or fulfil contracts with customers. The costs to obtain a contract with a customer are the incremental costs of obtaining the contract that the entity would not have incurred if the contract had not been obtained. The costs to fulfil a contract with a customer are the costs that relate directly to a contract or to an anticipated contract that the entity can specifically identify.

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The percentage of non-current amount of assets recognised from the costs to obtain or fulfil contracts with customers to other non-current non-financial assets.

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The percentage of amount of assets recognised from the costs to obtain or fulfil contracts with customers to other non-financial assets.

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