Leases - Leases in the Balance Sheet and Leases in the Income Statement (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Leases in the Balance Sheet
Total right-of-use assets	€ 1,375	€ 1,801
Property, plant, and equipment	€ 4,276	€ 4,934
Right-of-use assets as % of Property, plant, and equipment	32.00%	37.00%
Current lease liabilities	€ 294	€ 349
Current financial liabilities	€ 1,735	€ 4,808
Current lease liabilities as % of current financial liabilities	17.00%	7.00%
Non-current lease liabilities	€ 1,327	€ 1,791
Non-current financial liabilities	€ 7,941	€ 9,547
Non-current lease liabilities as % of non-current financial liabilities	17.00%	19.00%
Future minimum lease payments for facility leases that had not yet commenced	€ 37	€ 49
Leases in the Income Statement
Lease expenses within operating profit - Depreciation of right-of-use assets	325	397
Land and Buildings
Leases in the Balance Sheet
Total right-of-use assets	1,320	1,758
Other Property, Plant and Equipment
Leases in the Balance Sheet
Total right-of-use assets	€ 55	€ 43

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

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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- Definition

The amount of property, plant and equipment including right-of-use assets whose underlying assets would be presented as property, plant and equipment if they were owned. [Refer: Property, plant and equipment; Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of assets that represent a lessee's right to use an underlying asset for the lease term that do not meet the definition of investment property. 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Represents the current lease liabilities as percentage of current financial liabilities.

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- Definition

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

+ References

No definition available.

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No definition available.

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- Definition

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

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No definition available.

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- Definition

Represents the right-of-use assets as percentage of property, plant, and equipment.

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No definition available.

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