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Deferred tax assets and liabilities - Changes in deferred tax liabilities and assets (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Deferred tax liabilities, gross |  |
Deferred tax assets and liabilities |  |
Deferred tax liability (asset) at beginning of year | € 9,583 | € 7,956
Additions | 960 | 1,265
Deductions | (1,326) | (1,205)
Currency translation differences | (725) | 194
Other changes | 89 | (97)
Deferred tax liability (asset) at end of year | 8,581 | 9,583
Deferred tax liabilities, gross | Increase (decrease) due to application of IFRS 16 |  |
Deferred tax assets and liabilities |  |
Deferred tax liability (asset) at beginning of year |  | 1,470
Deferred tax liabilities, gross | After initial application |  |
Deferred tax assets and liabilities |  |
Deferred tax liability (asset) at beginning of year |  | 9,426
Deferred tax assets, gross |  |
Deferred tax assets and liabilities |  |
Deferred tax liability (asset) at beginning of year | (15,767) | (13,356)
Additions | (2,649) | (2,091)
Deductions | 1,357 | 1,407
Currency translation differences | 742 | (182)
Other changes | 86 | (75)
Deferred tax liability (asset) at end of year | (16,231) | (15,767)
Deferred tax assets, gross | Increase (decrease) due to application of IFRS 16 |  |
Deferred tax assets and liabilities |  |
Deferred tax liability (asset) at beginning of year |  | (1,470)
Deferred tax assets, gross | After initial application |  |
Deferred tax assets and liabilities |  |
Deferred tax liability (asset) at beginning of year |  | (14,826)
Accumulated impairment |  |
Deferred tax assets and liabilities |  |
Deferred tax liability (asset) at beginning of year | 6,744 | 5,741
Additions | 2,638 | 1,161
Deductions | (130) | (174)
Currency translation differences | (192) | 34
Other changes | 5 | (18)
Deferred tax liability (asset) at end of year | 9,065 | 6,744
Accumulated impairment | After initial application |  |
Deferred tax assets and liabilities |  |
Deferred tax liability (asset) at beginning of year |  | 5,741
Deferred tax assets net of impairment before offsetting |  |
Deferred tax assets and liabilities |  |
Deferred tax liability (asset) at beginning of year | (9,023) | (7,615)
Additions | (11) | (930)
Deductions | 1,227 | 1,233
Currency translation differences | 550 | (148)
Other changes | 91 | (93)
Deferred tax liability (asset) at end of year | € (7,166) | (9,023)
Deferred tax assets net of impairment before offsetting | Increase (decrease) due to application of IFRS 16 |  |
Deferred tax assets and liabilities |  |
Deferred tax liability (asset) at beginning of year |  | (1,470)
Deferred tax assets net of impairment before offsetting | After initial application |  |
Deferred tax assets and liabilities |  |
Deferred tax liability (asset) at beginning of year |  | € (9,085)

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- Definition Schedule disclosing information related to details of deferred tax liabilities line items. + References No definition available. + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81&doctype=Standard -URIDate 2020-01-01 + Details
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