Leases - Leases in the Balance Sheet and Leases in the Income Statement (Details) - EUR (€) € in Millions		12 Months Ended
Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Leases in the Balance Sheet
Total right-of-use assets	€ 1,967	€ 1,857	€ 1,967
Non-current assets	€ 44,999	€ 43,402	44,999
Right-of-use assets as % of non-current assets	4.00%	4.00%
Current lease liabilities	€ 389	€ 380	389
Current financial liabilities	€ 3,273	€ 2,348	3,273
Current lease liabilities as % of current financial liabilities	12.00%	16.00%
Non-current lease liabilities	€ 1,814	€ 1,740	1,814
Non-current financial liabilities	€ 12,923	€ 13,605	12,923
Non-current lease liabilities as % of non-current financial liabilities	14.00%	13.00%
Future minimum lease payments for facility leases that had not yet commenced		€ 161
Future commitments on services and IFRS 16-related assets related to data center leases		217
Leases in the Income Statement [Abstract]
Lease expenses within operating profit - Depreciation of right-of-use assets		396	396
Land and buildings
Leases in the Balance Sheet
Total right-of-use assets	€ 1,929	1,816	1,929
Other Property, Plant and Equipment
Leases in the Balance Sheet
Total right-of-use assets	€ 38	€ 41	€ 38

The amount of current financial liabilities. [Refer: Financial liabilities]

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The amount of current lease liabilities. [Refer: Lease liabilities]

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- Definition

The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets]

+ References

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The amount of assets that do not meet the definition of current assets. [Refer: Current assets]

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The amount of non-current financial liabilities. [Refer: Financial liabilities]

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The amount of non-current lease liabilities. [Refer: Lease liabilities]

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The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee.

+ References

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Represents the current lease liabilities as percentage of current financial liabilities.

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The amount of future commitments for leases on services and IFRS 16-related assets.

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The amount of future minimum lease payments that the company has committed to pay for leases that had not yet commenced.

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No definition available.

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Represents the noncurrent lease liabilities as percentage of noncurrent financial liabilities.

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No definition available.

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Represents the right-of-use assets as percentage of noncurrent assets.

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