Banco Santander (SAN) 6-K 30 Jul 21 2021 Q2 Current report (foreign) Financial data

Cover

Cover	6 Months Ended
	Jun. 30, 2021
Cover [Abstract]
Document Type	6-K
Entity File Number	001-12518
Entity Registrant Name	Banco Santander, S.A.
Entity Address, Address Line One	28660 Boadilla del Monte (Madrid)
Entity Address, Country	ES
Entity Central Index Key	0000891478
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Period End Date	Jun. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
ASSETS
CASH, CASH BALANCES AT CENTRAL BANKS AND OTHER DEPOSITS ON DEMAND	€ 183,091	€ 153,839
FINANCIAL ASSETS HELD FOR TRADING	102,792	114,945
NON-TRADING FINANCIAL ASSETS MANDATORILY AT FAIR VALUE THROUGH PROFIT OR LOSS	4,838	4,486
FINANCIAL ASSETS DESIGNATED AT FAIR VALUE THROUGH PROFIT OR LOSS	56,486	48,717
FINANCIAL ASSETS AT FAIR VALUE THROUGH OTHER COMPREHENSIVE INCOME	114,505	120,953
FINANCIAL ASSETS AT AMORTISED COST	1,003,417	958,378
HEDGING DERIVATIVES	5,430	8,325
CHANGES IN THE FAIR VALUE OF HEDGED ITEMS IN PORTFOLIO HEDGES OF INTEREST RISK	1,434	1,980
INVESTMENTS	7,562	7,622
Joint venture entities	1,620	1,492
Associated entities	5,942	6,130
ASSETS UNDER INSURANCE OR REINSURANCE CONTRACTS	276	261
TANGIBLE ASSETS	32,678	32,735
Property, plant and equipment	31,712	31,772
Investment properties	966	963
INTANGIBLE ASSETS	16,454	15,908
Goodwill	12,854	12,471
Other intangible assets	3,600	3,437
TAX ASSETS	24,707	24,586
Current tax assets	4,956	5,340
Deferred tax assets	19,751	19,246
OTHER ASSETS	9,889	11,070
Insurance contracts linked to pensions	162	174
Inventories	5	5
Other	9,722	10,891
NON-CURRENT ASSETS HELD FOR SALE	5,077	4,445
TOTAL ASSETS	1,568,636	1,508,250
LIABILITIES
FINANCIAL LIABILITIES HELD FOR TRADING	68,982	81,167
FINANCIAL LIABILITIES DESIGNATED AT FAIR VALUE THROUGH PROFIT OR LOSS	54,131	48,038
FINANCIAL LIABILITIES AT AMORTISED COST	1,310,433	1,248,188
HEDGING DERIVATIVES	6,573	6,869
CHANGES IN THE FAIR VALUE OF HEDGED ITEMS IN PORTFOLIO HEDGES OF INTEREST RATE RISK	427	286
LIABILITIES UNDER INSURANCE OR REINSURANCE CONTRACTS	1,014	910
PROVISIONS	10,400	10,852
TAX LIABILITIES	9,154	8,282
Current tax liabilities	2,711	2,349
Deferred tax liabilities	6,443	5,933
OTHER LIABILITIES	11,777	12,336
LIABILITIES ASSOCIATED WITH NON-CURRENT ASSETS HELD FOR SALE	0	0
TOTAL LIABILITIES	1,472,891	1,416,928
SHAREHOLDERS´ EQUITY
SHAREHOLDERS´ EQUITY	117,552	114,620
CAPITAL	8,670	8,670
Called up paid capital	8,670	8,670
Unpaid capital which has been called up	0	0
SHARE PREMIUM	47,979	52,013
EQUITY INSTRUMENTS ISSUED OTHER THAN CAPITAL	641	627
Equity component of the compound financial instrument	0	0
Other equity instruments issued	641	627
OTHER EQUITY	165	163
ACCUMULATED RETAINED EARNINGS	60,280	65,583
REVALUATION RESERVES	0	0
OTHER RESERVES	(3,762)	(3,596)
(-) OWN SHARES	(96)	(69)
PROFIT ATTRIBUTABLE TO SHAREHOLDERS OF THE PARENT	3,675	(8,771)
(-) INTERIM DIVIDENDS	0	0
OTHER ACCUMULATED COMPREHENSIVE INCOME	(32,181)	(33,144)
ITEMS NOT RECLASSIFIED TO PROFIT OR LOSS	(4,962)	(5,328)
ITEMS THAT MAY BE RECLASSIFIED TO PROFIT OR LOSS	(27,219)	(27,816)
NON-CONTROLLING INTEREST	10,374	9,846
Other comprehensive income	(1,817)	(1,800)
Other items	12,191	11,646
TOTAL EQUITY	95,745	91,322
TOTAL LIABILITIES AND EQUITY	1,568,636	1,508,250
Loan commitments granted
SHAREHOLDERS´ EQUITY
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	247,154	241,230
Financial guarantees granted
SHAREHOLDERS´ EQUITY
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	12,121	12,377
Other commitments granted
SHAREHOLDERS´ EQUITY
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	81,277	64,538
Pension and other post-retirement obligations
LIABILITIES
PROVISIONS	3,454	3,976
Other long term employee benefits
LIABILITIES
PROVISIONS	1,407	1,751
Taxes and other legal contingencies
LIABILITIES
PROVISIONS	2,169	2,200
Contingent liabilities and commitments
LIABILITIES
PROVISIONS	661	700
Other provisions
LIABILITIES
PROVISIONS	2,709	2,225
For own-use
ASSETS
Property, plant and equipment	12,921	13,213
Leased out under an operating lease
ASSETS
Property, plant and equipment	18,791	18,559
Investment properties	€ 863	€ 793

Condensed Consolidated Income S

Condensed Consolidated Income Statements - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
IFRS Statement [Line Items]
Interest income	€ 21,933	€ 24,499
Interest expense	(5,737)	(8,297)
Interest income/ (charges)	16,196	16,202
Dividend income	309	265
Income from companies accounted for using the equity method	163	(135)
Commission income	6,676	6,716
Commission expense	(1,507)	(1,580)
Gain or losses on financial assets and liabilities not measured at fair value through profit or loss, net	344	688
Gains or losses on financial assets and liabilities held for trading, net	347	1,848
Gains or losses on non-trading financial assets and liabilities mandatorily at fair value through profit or loss	10	27
Gain or losses on financial assets and liabilities measured at fair value through profit or loss, net	221	(129)
Gain or losses from hedge accounting, net	57	(26)
Exchange differences, net	(85)	(1,335)
Other operating income	1,167	765
Other operating expenses	(1,289)	(1,122)
Income from assets under insurance and reinsurance contracts	769	715
Expenses from liabilities under insurance and reinsurance contracts	(683)	(631)
Total income	22,695	22,268
Administrative expenses	(8,996)	(9,288)
Staff costs	(5,438)	(5,470)
Other general and administrative expenses	(3,558)	(3,818)
Depreciation and amortisation cost	(1,381)	(1,419)
Provisions or reversal of provisions, net	(1,490)	(614)
Impairment or reversal of impairment on financial assets not measured at fair value through profit or loss, net	(3,804)	(7,030)
Impairment of investments in subsidiaries, joint ventures and associates, net	0	0
Impairment on non-financial assets, net	(130)	(10,241)
Impairment or reversal of impairment on tangible assets, net	(125)	(93)
Impairment or reversal of impairment on intangible assets, net	(3)	(10,146)
Impairment or reversal of impairment on other assets, net	(2)	(2)
Gain or losses on non financial assets and investments, net	52	27
Negative goodwill recognised in results	0	6
Gains or losses on non-current assets held for sale not classified as discontinued operations	(32)	(119)
Operating profit/(loss) before tax	6,914	(6,410)
Tax expense or income from continuing operations	(2,474)	(3,928)
Profit/(loss) for the period from continuing operations	4,440	(10,338)
Profit/( loss) after tax from discontinued operations	0	0
Profit/(loss) for the period	4,440	(10,338)
Profit attributable to non-controlling interests	765	460
Profit/(loss) attributable to the parent	€ 3,675	€ (10,798)
Earnings/(losses) per share
Basic (in eur per share)	€ 0.20	€ (0.64)
Diluted (in eur per share)	€ 0.20	€ (0.64)
Other financial assets and liabilities
IFRS Statement [Line Items]
Gain or losses on financial assets and liabilities not measured at fair value through profit or loss, net	€ 267	€ 715
Financial assets at fair value through other comprehensive income
IFRS Statement [Line Items]
Interest income	1,292	1,973
Impairment or reversal of impairment on financial assets not measured at fair value through profit or loss, net	(19)	(3)
Financial assets at amortised cost
IFRS Statement [Line Items]
Interest income	19,149	21,255
Gain or losses on financial assets and liabilities not measured at fair value through profit or loss, net	77	(27)
Impairment or reversal of impairment on financial assets not measured at fair value through profit or loss, net	(3,785)	(7,027)
Other interest income
IFRS Statement [Line Items]
Interest income	1,492	1,271
Reclassification of financial assets at fair value through other comprehensive income
IFRS Statement [Line Items]
Gains or losses on financial assets and liabilities held for trading, net	0	0
Gains or losses on non-trading financial assets and liabilities mandatorily at fair value through profit or loss	0	0
Reclassification of financial assets at amortized cost
IFRS Statement [Line Items]
Gains or losses on financial assets and liabilities held for trading, net	0	0
Gains or losses on non-trading financial assets and liabilities mandatorily at fair value through profit or loss	0	0
Other gains (losses)
IFRS Statement [Line Items]
Gains or losses on financial assets and liabilities held for trading, net	347	1,848
Gains or losses on non-trading financial assets and liabilities mandatorily at fair value through profit or loss	€ 10	€ 27

Condensed Consolidated Statemen

Condensed Consolidated Statements of Recognized Income and Expense - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement of comprehensive income [abstract]
CONSOLIDATED PROFIT/(LOSS) FOR THE PERIOD	€ 4,440	€ (10,338)
OTHER COMPREHENSIVE INCOME	946	(7,184)
Items that will not be reclassified to profit or loss	390	(696)
Actuarial gains/(losses) on pension plans	885	204
Non-current assets held for sale	0	0
Other recognised income and expense of investments in subsidiaries, joint ventures and associates	(8)	(7)
Changes in the fair value of equity instruments measured at fair value through other comprehensive income	(68)	(880)
Gains or losses resulting from the accounting for hedges of equity instruments measured at fair value through other comprehensive income, net	0	0
Changes in the fair value of equity instruments measured at fair value through other comprehensive income (hedged item)	54	12
Changes in the fair value of equity instruments measured at fair value through other comprehensive income (hedging instrument)	(54)	(12)
Changes in the fair value of financial liabilities at fair value through profit or loss attributable to changes in credit risk	(129)	65
Income tax relating to items that will not be reclassified	(290)	(78)
Items that may be reclassified to profit or loss	556	(6,488)
Hedges of net investments in foreign operations:	(1,001)	2,524
Revaluation gains (losses)	(1,001)	2,524
Amounts transferred to income statement	0	0
Other reclassifications	0	0
Exchange differences	3,036	(9,499)
Revaluation gains (losses)	3,036	(9,499)
Amounts transferred to income statement	0	0
Other reclassifications	0	0
Cash flow hedges:	(230)	774
Revaluation gains/(losses)	(651)	3,070
Amounts transferred to income statement	421	(2,296)
Transferred to initial carrying amount of hedged items	0	0
Other reclassifications	0	0
Hedging instruments (items not designated)	0	0
Revaluation gains (losses)	0	0
Amounts transferred to income statement	0	0
Other reclassifications	0	0
Debt instruments at fair value with changes in other comprehensive income	(1,914)	(82)
Revaluation gains (losses)	(1,637)	272
Amounts transferred to income statement	(277)	(727)
Other reclassifications	0	373
Non-current assets held for sale	0	0
Revaluation gains (losses)	0	0
Amounts transferred to income statement	0	0
Other reclassifications	0	0
Share of other recognised income and expense of investments	49	(212)
Income tax relating to items that may be reclassified to profit or loss	616	7
Total comprehensive income	5,386	(17,522)
Attributable to non-controlling interests	748	(255)
Attributable to the parent	€ 4,638	€ (17,267)

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Changes in Total Equity - EUR (€) € in Millions	Total	Previously Reported	Capital	CapitalPreviously Reported	Share premium	Share premiumPreviously Reported	Equity instruments issued (not capital)	Equity instruments issued (not capital)Previously Reported	Other equity instruments	Other equity instrumentsPreviously Reported	Accumulated retained earnings	Accumulated retained earningsPreviously Reported	Revaluation reserves	Revaluation reservesPreviously Reported	Other reserves	Other reservesPreviously Reported	(-) Own shares	(-) Own sharesPreviously Reported	Profit Attributable to shareholders of the parent	Profit Attributable to shareholders of the parentPreviously Reported	(-) Interim dividends	(-) Interim dividendsPreviously Reported	Other comprehensive income	Other comprehensive incomePreviously Reported	Other comprehensive income non-controlling interests	Other comprehensive income non-controlling interestsPreviously Reported	Other elements, non-controlling interest	Other elements, non-controlling interestPreviously Reported	Non-controlling interest, other elements
Equity at beginning of period at Dec. 31, 2019	€ 110,659	€ 110,659	€ 8,309	€ 8,309	€ 52,446	€ 52,446	€ 598	€ 598	€ 146	€ 146	€ 61,028	€ 61,028	€ 0	€ 0	€ (3,110)	€ (3,110)	€ (31)	€ (31)	€ 6,515	€ 6,515	€ (1,662)	€ (1,662)	€ (24,168)	€ (24,168)	€ (982)	€ (982)	€ 11,570	€ 11,570
Total recognized income and expense	(17,522)																		(10,798)				(6,469)		(715)		460
Other changes in equity	(1,278)						13		26		6,566				(598)		(34)		(6,515)		0						(736)
Dividends recognised as distributions to non-controlling interests																											(279)
Dividends recognised as distributions to owners	(279)										0
Purchase of equity instruments	(454)																(454)
Disposal of equity instruments	421														1		420
Transfers between equity items	0										6,566				(51)				(6,515)		0
Increases or ( ) decreases due to business combinations	4																										4
Share-based payment	(56)								(56)
Other increases or ( ) decreases of the equity	(914)						13		82						(548)												(461)
Equity at end of period at Jun. 30, 2020	91,859		8,309		52,446		611		172		67,594		0		(3,708)		(65)		(10,798)		(1,662)		(30,637)		(1,697)		11,294
Equity at beginning of period at Dec. 31, 2019	110,659	110,659	8,309	8,309	52,446	52,446	598	598	146	146	61,028	61,028	0	0	(3,110)	(3,110)	(31)	(31)	6,515	6,515	(1,662)	(1,662)	(24,168)	(24,168)	(982)	(982)	11,570	11,570
Total recognized income and expense	(3,557)
Equity at end of period at Dec. 31, 2020	91,322	€ 91,322	8,670	€ 8,670	52,013	€ 52,013	627	€ 627	163	€ 163	65,583	€ 65,583	0	€ 0	(3,596)	€ (3,596)	(69)	€ (69)	(8,771)	€ (8,771)	0	€ 0	(33,144)	€ (33,144)	(1,800)	€ (1,800)	11,646	€ 11,646
Total recognized income and expense	5,386																		3,675				963		(17)		765
Other changes in equity	(963)				(4,034)		14		2		(5,303)				(166)		(27)		8,771								(220)
Issue of equity	17																												€ 17
Dividends recognised as distributions to non-controlling interests																											(347)
Dividends recognised as distributions to owners	(824)				(477)
Purchase of equity instruments	(404)																(404)
Disposal of equity instruments	384														7		377
Transfers between equity items	0				(3,557)						(5,303)				89				8,771
Increases or ( ) decreases due to business combinations	0																										0
Share-based payment	(48)								(48)
Other increases or ( ) decreases of the equity	(88)						14		50						(262)												110
Equity at end of period at Jun. 30, 2021	€ 95,745		€ 8,670		€ 47,979		€ 641		€ 165		€ 60,280		€ 0		€ (3,762)		€ (96)		€ 3,675		€ 0		€ (32,181)		€ (1,817)		€ 12,191

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement of cash flows [abstract]
CASH FLOWS FROM OPERATING ACTIVITIES	€ 28,045	€ 45,068
NET INCOME	4,440	(10,338)
Adjustments made to obtain the cash flows from operating activities	11,142	24,498
Depreciation and amortization	1,381	1,419
Other adjustments	9,761	23,079
Net increase/(decrease) in operating assets	9,091	116,992
Financial assets held-for-trading	(13,569)	23,047
Non-trading financial assets mandatorily at fair value through profit or loss	280	1,093
Financial assets at fair value through profit or loss	7,447	31,872
Financial assets at fair value through other comprehensive income	(6,313)	6,719
Financial assets at amortised cost	26,923	49,175
Other operating assets	(5,677)	5,086
Net increase/(decrease) in operating liabilities	22,830	148,123
Financial liabilities held-for-trading	(13,014)	25,175
Financial liabilities designated at fair value through profit or loss	6,467	1,171
Financial liabilities at amortised cost	33,692	124,835
Other operating liabilities	(4,315)	(3,058)
Income tax recovered/(paid)	(1,276)	(223)
CASH FLOWS FROM INVESTING ACTIVITIES	(1,678)	(2,845)
Payments	4,022	4,664
Payments for tangible assets	3,363	2,538
Payments for intangible assets	593	609
Payments for investments	11	466
Payments for subsidiaries and other business units	55	1,051
Payments for non-current assets held for sale and associated liabilities	0	0
Other payments related to investing activities	0	0
Proceeds from investing	2,344	1,819
Proceeds from tangible assets	1,673	875
Proceeds from intangible assets	0	0
Proceeds from investments	286	29
Proceeds from subsidiaries and other business units	0	526
Proceeds from non-current assets held for sale and associated liabilities	385	389
Other proceeds related to investment activities	0	0
CASH FLOWS FROM FINANCING ACTIVITIES	(286)	(1,858)
Payments for financing	2,277	4,210
Payments for dividends	477	0
Payments of subordinated liabilities	645	2,089
Redemption of own equity instruments	0	0
Payments for acquisition of own equity instruments	404	454
Other payments related to financing activities	751	1,667
Proceeds from financing	1,991	2,352
Proceeds from subordinated liabilities	1,586	1,853
Issuance of own equity instruments	0	0
Proceeds from disposal of own equity instruments	387	421
Other proceeds related to financing activities	18	78
EFFECT OF FOREIGN EXCHANGE RATE CHANGES	3,171	(3,166)
NET INCREASE/(DECREASE) IN CASH AND CASH EQUIVALENTS	29,252	37,199
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	153,839	101,067
CASH AND CASH EQUIVALENTS AT END OF PERIOD	183,091	138,266
COMPONENTS OF CASH AND CASH EQUIVALENTS AT END OF PERIOD
Cash	6,929	7,002
Cash and bank balances at central banks	160,991	114,253
Other financial assets	15,171	17,011
Less: bank overdrafts refundable on demand	0	0
Total cash and cash equivalents	183,091	138,266
In which: restricted cash	€ 0	€ 0

Introduction, basis of presenta

Introduction, basis of presentation of the interim condensed consolidated financial statements and other information	6 Months Ended
	Jun. 30, 2021
Disclosure of reclassifications or changes in presentation [abstract]
Introduction, basis of presentation of the interim condensed consolidated financial statements and other information	Introduction, basis of presentation of the interim condensed consolidated financial statements and other information a) Introduction Banco Santander, S.A. ('the parent' or 'Banco Santander') is a private-law entity subject to the rules and regulations applicable to banks operating in Spain. The Bylaws and other public information of the Bank can be consulted at its registered office at Paseo de Pereda 9-12, Santander. In addition to the operations carried on directly by it, Banco Santander is the head of a group of subsidiaries that engage in various business activities and which compose, together with it, Grupo Santander ('Santander' or 'The Group'). Grupo Santander's interim condensed consolidated financial statements for the six-month period ended 30 June 2021 ('interim financial statements') were authorised by Grupo Santander's directors at the board of directors meeting held on 27 July 2021 . Grupo Santander's consolidated annual accounts for year 2020 were approved by shareholders at Banco Santander annual general meeting on 26 March 2021. b) Basis of presentation of the interim financial statements Under Regulation (EC) n.º 1606/2002 of the European Parliament and of the Council of 19 July 2002 all companies governed by the law of an EU Member State and whose securities are admitted to trading on a regulated market of any Member State must prepare their consolidated financial statements for the years beginning on or after 1 January, 2005 in conformity with the International Financial Reporting Standards ('IFRS') previously adopted by the European Union ('EU-IFRS'). In order to adapt the accounting system of Spanish credit institutions with the principles and criteria established by the IFRS adopted by the European Union ('EU-IFRS'), the Bank of Spain published circular 4/2017, dated 27 November 2017, and subsequent changes, on Public and Confidential Financial Reporting Standards and Financial Statement Formats. The consolidated annual accounts for 2020 were approved at the board of directors meeting on 22 February 2021 in compliance with International Financial Reporting Standards as adopted by the European Union, taking into account Bank of Spain Circular 4/2017, and subsequent modifications, using the basis of consolidation, accounting policies and measurement bases described in Note 2 to the aforementioned consolidated annual accounts and, accordingly, they presented fairly Grupo Santander’s consolidated equity and consolidated financial position at 31 December 2020 and the consolidated results of its operations, and the consolidated cash flows in 2020. The aforementioned consolidated annual accounts, which are included in Grupo Santander’s Form 6-K filed with the U.S. Securities and Exchange Commission on 14 April 2021, and these interim financial statements are also in compliance with International Financial Reporting Standards as issued by the International Accounting Standards Board ('IFRS-IASB', and together with EU-IFRS, `IFRS`). These interim financial statements were prepared and are presented in accordance with International Accounting Standard (IAS 34), Interim Financial Reporting, for the preparation of interim condensed financial statements, in conformity with Article 12 of Royal Decree 1362/2007, and taking into account the requirements of Circular 3/2018, of 28 June, of the Spanish National Securities Market Commission ('CNMV'). The aforementioned interim financial statements were included in the half-year financial report for the first six months of 2021 to be presented by the Group in accordance with the Circular 3/2018. In accordance with IAS 34, the interim financial statements are intended only to provide an update on the content of the latest consolidated annual accounts authorised for issue, focusing on new activities, events and circumstances occurring during the first six months, and does not duplicate information previously reported in the latest consolidated annual accounts. Consequently, these interim financial statements do not include all the information that would be required for a complete set of consolidated annual accounts prepared in accordance with IFRS and, accordingly, for a proper comprehension of the information included in these interim financial statements, they should be read together with Grupo Santander’s consolidated annual accounts for the year ended 31 December 2020. Grupo Santander policies include presenting the interim financial statements for its use in the different markets using the Euro as its presentation currency. The amounts held in other currencies and the balances of entities whose functional currency is not the Euro, have been translated to the presentation currency in accordance with the criteria indicated in Note 2.a to the consolidated annual accounts for 2020. As indicated in that Note, for practical reasons, the balance sheet amount has been converted to the closing exchange rate, the equity to the historical type, and the income and expenses have been converted by applying the average exchange rate of the period; the application of such exchange rate or that corresponding to the date of each transaction does not lead to significant differences in the interim financial statements of Grupo Santander. The accounting policies and methods used in preparing these interim financial statements are the same as those applied in the consolidated annual accounts for 2020 taking into account the standards and interpretations that became applicable during the first six months of 2021, which are detailed below: - Amendment to IFRS 4 Insurance Contracts, which is aimed at extending the expiry date of the temporary exemption from applying IFRS 9 by two years (from 1 January 2021 to 1 January 2023) for entities whose activities are predominantly insurance-related. This achieves alignment with the effective date of IFRS 17 Insurance Contracts (1 January 2023). It applies from 1 January 2021. The aforementioned amendment to accounting standards and interpretations has not had a significant effect on Grupo Santander’s financial statements. All accounting policies and measurement bases with a material effect on the interim financial statements for 30 June 2021 were applied in their preparation. By the time of the preparation and authorisation of these interim financial statements, there was the following standard to be adopted by the European Union whose effective date of implementation by the IASB is 1 January 2021. – Amendment IFRS 16 Leases: as a result of the covid-19 pandemic, IFRS 16 is amended to allow the lessee to apply a practical expedient and not consider the rental concessions a lease modification whenever the following requirements are met: the revised consideration is the same or less than the consideration prior to the change, the affected payments are prior to 30 June 2021, and there are no substantial changes in the rest of the lease conditions. On 31 March 2021, the IASB published an additional amendment to extend the scope of the practical expedient to 30 June 2022. The entry into force of the aforementioned amendment to the accounting standard no significant effects on the Group's interim financial statements are expected. IBOR Reform Since 2015, central banks and regulators in several major jurisdictions have promoted the transition to suitable replacements for some existing IBOR (Interbank Offered Rates) benchmarks such as Euro Overnight Index Average (EONIA) and London Interbank Offered Rates (LIBORs). On 27 July 2017, the Chief Executive of the U.K. Financial Conduct Authority (the FCA), which regulates the LIBOR, announced that the FCA will no longer persuade or compel banks to submit rates for the calculation of the LIBOR benchmarks after 2021. Additionally, on 13 September 2018 the WG euro RFR recommended that the Euro Short Term Rate (€STR) shall replace EONIA. Since 2 October 2019, the date on which the €STR became available, EONIA changed its methodology to be calculated as the €STR plus a spread of 8.5 basis points. This change in EONIA’s methodology is intended to facilitate the market’s transition from EONIA to €STR, with the former expected to be discontinued by the 3 January 2022. On October 2020, the International Swaps and Derivatives Association (ISDA) launched the IBOR Fallbacks Protocol, which become effective on 25 January 2021, and provide derivatives market participants with new IBOR fallbacks for legacy and new derivatives contracts. Banco Santander S.A. and several subsidiaries have adhered to this protocol. On December 2020, the European Union Council endorsed new rules amending of the European Union Benchmark Regulation (BMR). The aim of the amendments to the Benchmark Regulation is to make sure that a statutory replacement benchmark can be established by the regulators by the time a systemically important benchmark is no longer in use, and thus protect financial stability on European Union markets. The new rules give the Commission the power to replace so-called 'critical benchmarks', which could affect the stability of financial markets in Europe, and other relevant benchmarks, if their termination would result in a significant disruption in the functioning of financial markets in the European Union. The Commission will also be able to replace third country benchmarks if their cessation would result in a significant disruption in the functioning of financial markets or pose a systemic risk for the financial system in the European Union. In March 2021, the FCA announced the final dates for the cessation of LIBORs: – 31 December 2021 will see the cessation of publication of USD LIBOR (1-week and 2-month terms), CHF LIBOR (all terms), GBP LIBOR (overnight, 1-week, 2-month and 12-month terms), JPY LIBOR (overnight, 1-week, 2-month, and 12-month terms) and EUR LIBOR (all terms). – On 31 December 2021 the calculation methodology for some LIBORs will be reformed and will become non-representative: GBP LIBOR (1 month, 3 months and 6 months), JPY LIBOR (1 month, 3 months and 6 months). – On 30 June 2021 the publication of USD LIBOR (overnight, 12-month and 12-month maturities) will cease and the calculation methodology for USD LIBOR (1-month, 3-month and 6-month maturities) will be reformed and become non-representative. Interest rate benchmarks have an extended footprint in a significant number of contracts that Santander Group is holding and are used in multiple processes. The most relevant interest rate benchmarks for Santander are EURIBOR, EONIA, USD-LIBOR, GBP-LIBOR, and CHF-LIBOR. Santander Group uses these benchmarks as the reference rate not only for derivatives, but also for loans, discounting products, deposits, collateral agreements and floating rate notes, among others. The main risks to which Santander is exposed arising from financial instruments because of the transition are: (i) legal risks arising from potential changes required to documentation for new and existing transactions; (ii) risk management, financial and accounting risks arising from market risk models and from valuation, hedging, discontinuation and recognition of financial instruments linked to benchmark rates; (iii) business risk of a decrease in revenues of products linked to indices that will be replaced; (iv) pricing risks arising from how changes to benchmark indices could impact pricing mechanisms on some instruments; (v) operational risks arising from the potential requirement to adapt IT systems, trade reporting infrastructure and operational processes; (vi) conduct risks arising from the potential impact of communication with customers and engagement during the transition period and (vii)litigation risks regarding our existing products and services, which could adversely impact our profitability. In order to monitor the risks and address the challenges of the transition, Santander launched the IBOR Transition Programme in 2019. This programme has a group wide scope and reports on a regular basis to Executive Management involving statutory committees. Its main objective is to ensure a smooth operational transition and to anticipate and address any potential customer and conduct related issues that could arise from the IBOR transition. It also aims to ensure that all impacted areas, business units and geographies understand the risks associated with the transition in a homogeneous way and can take appropriate measures to mitigate them. This IBOR Transition Programme is aligned with the recommendations, guidance and milestones defined by regulators and working groups of different jurisdictions and is structured around the following areas: Technology & Operations, Legal, Client Outreach, Risk Management & Models, Conduct & Communications and Accounting & Finance. Additionally, Grupo Santander is engaged with the public and private sector initiatives in connection with IBOR transition. As part of this involvement, Santander participates in the WG Risk Free Rate Groups of different jurisdictions in Europe and America. Santander provides active feedback on the multiple consultations issued by industry forums, market associations, bank associations and other public organisms on this issue. c) Use of critical estimates The consolidated results and the determination of the consolidated equity are sensitive to the accounting principles and policies, valuation criteria and estimates used by the directors of Banco Santander in preparing the interim financial statements. The main accounting principles, policies, and valuation criteria are indicated in Note 2 of the consolidated annual accounts of the year 2020, except for those indicated in these interim financial statements due to the rules that have come into effect during the first six months of the year 2021. The interim financial statements contain estimates made by the senior management of Banco Santander and of the consolidated entities in order to quantify certain of the assets, liabilities, income, expenses and obligations reported in the consolidated entities. These estimates, which were made on the basis of the best information available, relate mainly to the following: 1. The income tax expense, which, in accordance with IAS 34, is recognised in interim periods based on the best estimate of the weighted average tax rate expected by Grupo Santander for the full financial year; 2. The impairment losses on certain assets – Financial assets at fair value through other comprehensive income, financial assets at amortised cost, non-current assets held for sale, investments in subsidiaries, joint ventures and associates, tangible assets and intangible assets; 3. The assumptions used in the calculation of the post-employment benefit liabilities and commitments and other obligations; 4. The useful life of the tangible and intangible assets; 5. The measurement of goodwill impairment arising on consolidation; 6. The calculation of provisions and the consideration of contingent liabilities; 7. The fair value of certain unquoted assets and liabilities; 8. The recoverability of deferred tax assets; and 9. The fair value of the identifiable assets acquired and the liabilities assumed in business combinations in accordance with IFRS 3. In order to update the estimates described above, Grupo Santander's management took into account the current situation as a result of covid-19, which significantly affects economic activity worldwide and, consequently, Grupo Santander's operations and financial results, as well as generating uncertainty in the estimates made. As a result, Group management has made an assessment of the current situation based on the best information available to date, identifying potential impacts of covid-19 on the main estimates made since the start of the pandemic, as well as for the first half of 2021. For estimates that have not changed during the first six months of this year, details are provided in Note 1.c of the consolidated financial statements for 2020. From the results of this evaluation, the following aspects stand out: – Credit risk: i. Covid-19 management and customer support: Since the start of the covid-19 health crisis last year, Grupo Santander's priority has been to look after the health of its employees, customers and shareholders, as well as helping to alleviate the economic impact of the pandemic and offering the best solutions to help our customers. The various measures implemented to manage the effects of the pandemic can be grouped into the following areas: • Identification and classification of clients or groups affected or potentially affected by the pandemic. • Granting of support measures under both government and internal programmes and close monitoring of the evolution of the customers subject to them, especially after their maturity, to ensure that their potential impairment is correctly reflected in the Group's risk management. • Remedial management activities where necessary. • Adaptation and reinforcement of our policies, models and processes relating to the estimation of expected losses and the classification of customers and transactions in order to ensure adequate risk management and hedging under the new environment. • Improvement and adaptation of reporting, incorporating new metrics and indicators such as those relating to the evolution of the pandemic or the volume and behaviour of moratoria, thus increasing the predictive capacity in relation to the evolution of the Group's risk profile. Grupo Santander continued to support its customers in the first half of 2021, fostering their economic resilience in all the Group's geographies. Regarding the moratorium measures granted, the amount at 30 June 2021 was around EUR 104,300 million. Of these, around 66% corresponded to residential mortgages, mainly in the UK where the portfolio has a low average loan to value (LTV) (<50%). The moratoriums granted in consumer lending operations (around EUR 16,400 million, or 16% of the total portfolio) are mainly car loans. The granting of new moratoriums slowed down from the second half of 2020 onwards. 92% of the total moratoriums (about EUR 96,000 million) have already matured by the end of June 2021, showing a good performance, with 5% of them being classified as stage 3 in accordance with IFRS 9. Loans subject to moratorium and not overdue amounted to EUR 8,700 million (mainly in Spain and Portugal), with about EUR 7,500 million maturing at the end of the third quarter. The continuous interaction and coordination with subsidiaries has been a key asset in the management of this crisis. The experience gained in the fight against the health crisis and its financial consequences in the different geographies has allowed us to share the best practices identified and to implement in an agile and efficient manner those strategies and specific actions that have been most successful, adapted to the local reality of each market. ii. Estimation of expected loss: The quantification of additional expected losses of the different credit portfolios was carried out by analysing the losses under IFRS 9 in accordance with the recommendations of the different accounting, regulatory and supervisory bodies. These highlighted the uncertainties surrounding the economic impacts of the covid-19 health crisis, which was also evident in the frequent updates of macroeconomic forecasts, with different perspectives as to the depth and duration of the crisis. Thus, the general recommendation (including IASB, ESMA, EBA and ECB) was not to mechanistically apply the usual techniques for calculating expected losses under IFRS 9, to prevent this variability of the fact that the impact on macroeconomic expectations would result in undesired volatility in outcomes, with its potential pro-cyclical effects on the economy. When estimating the expected loss, Grupo Santander analyses losses under IFRS 9 taking into account 3 types of elements: 1. Continuous monitoring of clients: • We continue to monitor and provide solutions to those Group customers whose moratoriums have expired, facilitating the restructuring of their debt for those customers with loans subject to government guarantee programmes that so require. Strict classification and loss recognition criteria are always applied in accordance with our internal rules, current regulations and supervisory recommendations. • Progress continued to be made in the processes of assessing and classifying our customers at the individual and sectoral level, following the various collective analyses carried out during the year. To this end, the behaviour of customers and the collective analyses carried out are continuously monitored, identifying and classifying on an individual basis those customers showing signs of impairment. As some of the uncertainties generated by the pandemic are cleared up, there will be a progressive move away from collective analyses towards a more individualised identification of deterioration. 2. Foresight • In this regard, when estimating the impact of macroeconomic information on the calculation of provisions under IFRS 9, the Group has continued to use macroeconomic scenarios based on the structural deterioration of the economy, following the guidance of supervisors and regulators in terms of a long-run view in the generation of scenarios. This structural view is generated through a more stable long-term outlook, reflecting the structural deterioration caused by the pandemic. For this purpose, for each geography, the point at which the macro, as represented by GDP and other relevant variants, recovers its potential growth trend is analysed, taking into account seasonal factors applicable to each economy. 3. Additional elements • Whenever they are necessary because they have not been captured under the two previous elements, they include, among others, the collective analysis including review of the sectors most affected by the pandemic, whenever their impacts have not been sufficiently captured by the macroeconomic scenarios. Also collective impairment assessment, whenever the potential deterioration in a group of customers cannot be identified individually. With the elements indicated above, the Group assesses the evolution of the credit quality of its customers in each of the geographical areas, for the purposes of their classification in phases in accordance with IFRS9 and consequently the calculation of the expected loss. iii. Quantification of additional provisions by covid-19: Numerous international authorities and supervisors noted the importance of cautiously adapting and applying accounting and prudential policies to the containment measures put in place to deal with the effects of the covid-19 health crisis. Considering these guidelines, Grupo Santander accounted for potential expected losses based on long-term stable macroeconomic forecasts, once the structural deterioration of the economy has materialised, through a subsequent overlay of the model, complemented by a collective and/or individual assessment in order to reflect a more accurate situation, specifically to recognise expected credit losses on assets that may have suffered a significant increase in credit risk (SCIR). In the case of collective assessment, without the need to identify which individual financial instruments suffered such SCIR. Such an overlay was considered the best option to recognise the increase in expected loss, as a mechanical application of the expected credit loss (ECL) methodology in the current context could have led to undesired volatility or unexpected results due to the lack of reliable information. Therefore, the additional provisions associated with different macroeconomic scenarios have been calculated using internal models; however, the above-mentioned overlay to the monthly IFRS 9 calculation has been considered to improve the control and monitoring of the accuracy of the expected credit loss estimation. The Group monitors the macroeconomic evolution in each of the geographies where it is present, and the adequacy of the provisions set up as indicated in the previous sections to the observed and expected impairment of its portfolios. As the relationship between the macroeconomic evolution, the models and the resulting provisions normalizes, the different units of the Group will progressively return in the coming quarters to the application of the IFRS 9 calculation processes in place prior to the outbreak of the pandemic. – Market risk: The evolution of financial markets during the first semester of 2021 has maintained the trend of previous quarters, with a normalisation of conditions after the tensions experienced during the first half of 2020. No significant increases in volatility, reductions in liquidity or reduced access to price sources and real market transactions for an appropriate valuation of our portfolios have been observed in the main risk factors present in our portfolios. Nor have we seen greater dispersion among the various price contributors and credit spreads have maintained their downward trend in a macroeconomic environment confident of economic recovery after the crisis of the last year. As a result, there has been no significant impact on the fair value hierarchy and most markets, underlying and maturities have maintained their classification, in line with our observability and significance criteria. Reclassifications between levels have been concentrated and not significant on specific positions for which there may have been a change in observability conditions or a change in access to reliable valuation sources. Nevertheless, the evolution of the markets, their liquidity and the observability conditions of the valuation inputs continue to be rigorously and exhaustively monitored in order to apply the criteria established in Grupo Santander for the classification of assets and liabilities measured at fair value and to anticipate any possible changes in current market conditions. The levels of risk measured in terms of VaR in all the Grupo Santander's units are at historically low levels. During the first semester of the year, positions in the portfolio remained low, with low use of the authorised risk limits. Grupo Santander's treasury activity continued to be concentrated in low complexity instruments and focused on providing services to our corporate clients, mainly in interest rate and FX risk factors. Although in the time window used to calculate VaR levels the high volatility scenarios observed last year due to the covid-19 crisis are maintained, exposure to risk is at historical lows of the last few years, approximately EUR 8.7 million (VaR 1d 99%) at the end of the semester . – Tax matters: In Spain, in June the tax assessments for corporate income tax financial years 2012-2015 were partially signed in disagreement. Banco Santander, S.A., as the parent of the Consolidated Tax Group, considers that these assessments should not have a significant impact on the consolidated financial statements or on capital, as there are sound defensive arguments in the appeals that will be filed. During the six-month period ended 30 June 2021, there have been no additional significant changes in the estimates made at the end of 2020, other than those indicated in this interim financial information. d) Contingent assets and liabilities Note 2.o to Grupo Santander's consolidated annual accounts for the year ended 31 December 2020 includes information on the contingent assets and liabilities at that date. There were no significant changes in Grupo Santander's contingent assets and liabilities from 31 December 2020 to the date of formal preparation of these interim financial statements. e) Comparative information The information in Note 3.b regarding the outstanding shares on June 2020 has been restated due to the capital increase described in Note 31.a of the consolidated annual accounts for year 2020 in accordance with IAS 33 Earnings per share. Additionally, the segment information corresponding to the period ended 30 June 2020 were restated for comparative purposes in accordance with the Group's new organizational structure, as required by IFRS 8 (see Note 12). In order to interpret the changes in the balances with respect to 31 December 2020, it is necessary to take into consideration the exchange rate effect arising from the volume of foreign currency balances held by the Group in view of its geographic diversity (Note 50.b to the consolidated annual accounts for the year ended 31 December 2020) and the impact of the appreciation/depreciation of the various currencies against the euro in the first six months of 2021: Mexican peso (3.61%), US dollar (3.45%), Brazilian real (7.28%), Argentine peso (-9.14%), Pound sterling (4.63%), Chilean peso (1.00%) and Polish zloty (0.90%); as well as the evolution of the average exchange rates between comparable periods: Mexican peso (-2.93%), US dollar (-8.57%), Brazilian real (-17.51%), Argentine peso (-35.51%), Pound sterling (0.74%), Chilean peso (3.11%) and Polish zloty (-2.80%). f) Seasonality of the Grupo Santander’s transactions The business activities carried on by Grupo Santander entities, and their transactions are not cyclical or seasonal in nature. Therefore, no specific disclosures are included in these explanatory notes to the interim financial statements for the six-month period ended 30 June 2021. g) Materiality In determining the note disclosures to be made on the various items in the interim financial statements or other matters, Grupo Santander, in accordance with IAS 34, took into account their materiality in relation to the interim financial statements for the six-month period ended 30 June 2021. h) Events after the reporting period From 1 July 2021 until the date of approval of the interim financial statements for the six-month period ended 30 June 2021, it is worth mentioning the following significant events: • On July 2, Santander Holdings USA, Inc (the parent company that groups Grupo Santander's businesses in the United States) announced an offer to acquire all the shares of Santander Consumer USA Holdings, Inc that it does not currently own at a price of USD 39 per share. At the time of the announcement Santander Holdings USA, Inc owns 80% of Santander Consumer USA. If all minority shareholders accept the offer, the transaction would represent a cash outlay for the Group of USD 2,358 million (equivalent to approximately EUR 2,000 million). • On July 15, Grupo Santander announced that its subsidiary Santander Holdings USA, Inc (the parent company that groups the Group's businesses in the US) has reached an agreement to acquire independent fixed income broker Amherst Pierpoint Securities through the purchase of its parent Pierpoint Capital Holdings LLC for a total amount of approximately USD 600 million (around EUR 500 million). The transaction, subject to regulatory approvals and customary closing conditions, is expected to be completed by the end of the first quarter of 2022.

Grupo Santander

Grupo Santander	6 Months Ended
	Jun. 30, 2021
Disclosure of detailed information about business combination [abstract]
Grupo Santander	Grupo Santander Appendices I, II and III to the consolidated annual accounts for the year ended 31 December 2020 provide relevant information on Grupo Santander companies at that date and on the companies accounted for under the equity method. Also, Note 3 to the aforementioned consolidated annual accounts includes a description of the most significant acquisitions and disposals of companies performed by Grupo Santander in 2020, 2019 and 2018. The most significant transactions carried out during the first six months of 2021 or pending execution at 30 June 2021 are described below: Tender offer for shares of Banco Santander México, S.A., Institución de Banca Múltiple, Grupo Financiero Santander Mexico On 26 March, Banco Santander, S.A. announced its intention to make a tender offer for all shares of Banco Santander Mexico, S.A., Institución de Banca Múltiple, Grupo Financiero Santander México ('Santander México') that are not owned by Grupo Santander, representing approximately 8.3% of the share capital of Santander México. On 8 June, Banco Santander, S.A. announced that, in order to provide a liquidity window for those investors who would like to exit their positions in the short term at the offered price, it intends to launch the Tender Offer as a voluntary tender offer pursuant to article 97 of the Mexican Securities Market Law, instead of a delisting tender offer, as previously announced. As a result, the Tender Offer will cease to be a delisting tender offer and, therefore, will no longer be subject to the approval of at least 95% of the existing capital of Santander México. The expected consideration for shareholders accepting the offer will be MXN 24 (approximately EUR 1) for each Santander Mexico share (and its equivalent for each American Depositary Share, securities listed on the New York Stock Exchange). If all the shares held by minority shareholders accept the offer, considering the currently envisaged, the acquisition of 8.3% would imply an investment by Banco Santander, S.A. of approximately MXN 13.19 billion (approximately EUR 550 million). The transaction is expected to close in the second semester of 2021. The commencement of the offer and the offer itself will be subject to customary regulatory conditions and approvals.

Shareholder remuneration system

Shareholder remuneration system and earnings per share	6 Months Ended
	Jun. 30, 2021
Shareholder remuneration system and earnings per share
Shareholder remuneration system and earnings per share	Shareholder remuneration system and earnings per share a) Shareholder remuneration system The cash remuneration paid by Banco Santander to its shareholders in the first six months of 2021 and 2020 was as follows: 30-06-2021 30-06-2020 % of par value Euros per share Amount (EUR million) % of par value Euros per share Amount (EUR million) Ordinary shares 5.50 % 0.0275 477 — — — Other shares (without vote, redeemable, etc.) — — — — — — Total remuneration paid 5.50 % 0.0275 477 — — — Dividend paid out of profit — — — — — — Dividend paid with a charge to reserves or share premium 5.50 % 0.0275 477 — — — Dividend in kind — — — — — — Flexible payment — — — — — — In May 2021, the Bank paid a dividend of 2.75 euro cents per share in cash for the 2020 financial year against share premium of EUR 477 million (see ECPN and Note 11), which is the maximum amount allowed under the limit set by the European Central Bank's recommendation of 15 December 2020. This payment was made in execution of the premium distribution resolution approved at the Bank's General Meeting of Shareholders held on 27 October 2020. b) Earnings per share from continuing and discontinued operations i. Basic earnings per share Basic earnings per share for the period are calculated by dividing the net profit attributable to Grupo Santander for the six-month period adjusted by the after-tax amount relating to the remuneration of contingently convertible preference shares recognised in equity by the weighted average number of ordinary shares outstanding during the period, excluding the average number of treasury shares held in the period. Accordingly: 30-06-2021 30-06-2020 Profit attributable to the Parent (EUR million) 3,675 (10,798) Remuneration of contingently convertible preferred securities (CCPS) (EUR million) (271) (278) 3,404 (11,076) Of which: Profit or Loss from discontinued operations (non controlling interest net) (EUR million) — — Profit or Loss from continuing operations (CCPS net) (EUR million) 3,404 (11,076) Weighted average number of shares outstanding 17,309,951,841 16,598,649,355 Impact factor correction (a) Not applicable 721,680,407 Adjusted number of shares 17,309,951,841 17,320,329,762 Basic earnings per share (euros) 0.20 (0.64) Of which: from discontinued operations (euros) — — from continuing operations (euros) 0.20 (0.64) (a) Correction factor for the capital increase on 3 December 2020 (see note 1.e). ii. Diluted earnings per share Diluted earnings per share for the period are calculated by dividing the net profit attributable to Grupo Santander for the six-month period adjusted by the after-tax amount relating to the remuneration of contingently convertible preference shares recognised in equity and of perpetual liabilities contingently amortisable in their case by the weighted average number of ordinary shares outstanding during the period, excluding the average number of treasury shares and adjusted for all the dilutive effects inherent to potential ordinary shares (share options, warrants and convertible debt instruments). Accordingly, diluted earnings per share were determined as follows: 30-06-2021 30-06-2020 Profit attributable to the Parent (EUR million) 3,675 (10,798) Remuneration of contingently convertible preferred securities (CCPS) (EUR million) (271) (278) 3,404 (11,076) Of which: Profit or Loss from discontinued operations (non controlling interest net) (EUR million) — — Profit or Loss from continuing operations (CCPS net) (EUR million) 3,404 (11,076) Weighted average number of shares outstanding 17,309,951,841 16,598,649,355 Dilutive effect of options/receipt of shares 48,815,931 Not applicable Impact factor correction (a) Not applicable 721,680,407 Adjusted number of shares 17,358,767,772 17,320,329,762 Diluted earnings per share (euros) 0.20 (0.64) Of which: from discontinued operations (euros) — — from continuing operations (euros) 0.20 (0.64) (a) Correction factor for the capital increase on 3 December 2020 (see note 1.e).

Remuneration and other benefits

Remuneration and other benefits paid to the Bank's directors and senior managers	6 Months Ended
	Jun. 30, 2021
Remuneration and other benefits paid to the Bank's directors and senior managers
Remuneration and other benefits paid to the Bank's directors and senior managers	Remuneration and other benefits paid to Banco Santander’s directors and senior managers Note 5 to Grupo Santander’s consolidated annual accounts for the year ended 31 December 2020 details the remuneration and other benefits to members of Banco Santander’s Board of Directors and senior management in 2020. Following is a summary of the most significant data on the remunerations and benefits for the six months ended 30 June 2021 and 2020: Remuneration of members of the board of directors (1) Thousand euros 30-06-2021 30-06-2020 Members of the board of directors: (2)(3)(4)(5)(6)(7)(8)(9) Remuneration concept Fixed salary remuneration of executive directors 3,234 2,859 Variable salary remuneration of executive directors — — Directors fees 590 605 Bylaw-stipulated emoluments (annual emolument) 1,857 1,637 Other (except insurance premiums) 1,236 1,416 Sub-total 6,917 6,517 Transactions with shares and/or other financial instruments — — 6,917 6,517 (1) The Notes to the consolidated annual accounts for 2021 will contain detailed and complete information on the remuneration paid to all the directors, including executive directors. (2) Mr Rodrigo Echenique ceased to be a non-executive director on 22 December 2020. (3) Mr Sergio Rial was appointed as executive director since 30 May 2020. (4) Mr Luis Isasi was appointed as director since 19 May 2020. (5) Mr Guillermo de la Dehesa ceased to be a director on 3 April 2020. (6) Mr Ignacio Benjumea ceased to be a director on 5 May 2020. (7) Ms Esther Giménez-Salinas ceased to be a director on 27 October 2020. (8) Ms Gina Díez was appointed as director since 22 December 2020. (9) Mr Ramón Martín Chávez was appointed as director since 27 October 2020. Other benefits of members of the board of directors Thousand euros 30-06-2021 30-06-2020 Members of the board of directors Other benefits Advances — — Loans granted 73 34 Pension funds and plans: Endowments and/or contributions (1) 912 1,010 Pension funds and plans: Accumulated rights (2) 68,317 79,015 Life insurance premiums 677 896 Guarantees provided for directors — — (1) These correspond to the endowments and/or contributions made during the first six months of 2021 and 2020 in respect of retirement pensions and complementary benefits for widowhood, orphanhood and permanent disability. (2) Corresponds to the rights accrued by the directors in matters of pensions. Additionally, former members of the board had at 30 June 2021 and 30 June 2020 rights accrued for this concept for EUR 50,107 thousand and EUR 56,778 thousand, respectively. Remuneration of senior management (1)(2) The table below includes the corresponding amounts related to remunerations of senior management at 30 June 2021 and 2020, excluding the executive directors: Thousand euros 30-06-2021 30-06-2020 Senior management (1) Total remuneration of senior management (2) 14,014 15,275 (1) Remunerations received during the first six months by members of the senior management who ceased in their functions by 30 June 2021, amounted to 2,690 thousand euros (EUR 2,822 thousand at 30 June 2020). (2) The number of members of Banco Santander's senior management, excluding executive directors, is 16 as at 30 June 2021 (30 June 2020 : 17). The variable annual remuneration (or bonuses) received for fiscal year 2020, both for directors and the rest of senior management, were included in the information on remuneration included in the annual report for that year. Similarly, the variable remuneration attributable to the 2021 results, which will be submitted for approval by the Board of Directors at the appropriate time, will be included in the financial statements for the current year. Funds and pension plans of senior management Thousand euros 30-06-2021 30-06-2020 Senior management (1) Pension funds: Endowments and / or contributions (2) 2,917 2,987 Pension funds: Accumulated rights (3) 57,372 55,229 (1) Remunerations received as endowments and/or contributions to pension funds during the first six months by members of the senior management who ceased in their functions by 30 June 2021, amounted to EUR 195 thousand (EUR 178 thousand at 30 June 2020). (2) Corresponds to the allocations and/or contributions made during the first six months of 2021 and 2020 as retirement pensions. (3) Corresponds to the rights accrued by members of senior management in the area of pensions. In addition, former members of senior management had at 30 June 2021 and 30 June 2020 rights accumulated for this same concept for EUR 132,597 thousand and EUR 160,278 thousand, respectively.

Financial assets

Financial assets	6 Months Ended
	Jun. 30, 2021
Disclosure of financial assets [abstract]
Financial assets	Financial assets a) Breakdown The detail, by nature and category for measurement purposes, of Grupo Santander's financial assets, other than the balances relating to Cash, cash balances at central banks and other deposits on demand and Hedging derivatives, at 30 June 2021 and 31 December 2020 is as follows, presented by the nature and categories for valuation purposes: EUR million 30-06-2021 Financial Non-trading Financial Financial Financial Derivatives 54,867 Equity instruments 13,545 3,607 2,751 Debt instruments 34,114 810 2,763 103,549 29,038 Loans and advances 265 421 53,723 8,205 974,379 Central Banks — — 4,881 — 13,548 Credit institutions — — 23,910 — 40,136 Customers 265 421 24,932 8,205 920,695 Total 102,792 4,838 56,486 114,505 1,003,417 EUR million 31-12-2020 Financial Non-trading Financial Financial Financial Derivatives 67,137 Equity instruments 9,615 3,234 2,783 Debt instruments 37,894 700 2,979 108,903 26,078 Loans and advances 299 552 45,738 9,267 932,300 Central Banks — — 9,481 — 12,499 Credit institutions 3 — 12,136 — 37,838 Customers 296 552 24,121 9,267 881,963 Total 114,945 4,486 48,717 120,953 958,378 Following is the gross exposure of financial assets subject to impairment stages at 30 June 2021 and 31 December 2020: EUR million 30-06-2021 31-12-2020 Gross amount Gross amount Stage 1 Stage 2 Stage 3 Total Stage 1 Stage 2 Stage 3 Total Financial assets at fair value through other comprehensive income 111,684 29 101 111,814 118,150 6 50 118,206 Debt instruments 103,554 1 6 103,561 108,903 6 6 108,915 Loans and advances 8,130 28 95 8,253 9,247 — 44 9,291 Central Banks — — — — — — — — Credit institutions — — — — — — — — Customers 8,130 28 95 8,253 9,247 — 44 9,291 Financial assets at amortised cost 927,729 66,964 32,045 1,026,738 884,892 66,170 30,670 981,732 Debt instruments 28,773 118 435 29,326 25,889 66 395 26,350 Loans and advances 898,956 66,846 31,610 997,412 859,003 66,104 30,275 955,382 Central Banks 13,548 — — 13,548 12,499 — — 12,499 Credit institutions 40,142 — — 40,142 37,845 — 1 37,846 Customers 845,266 66,846 31,610 943,722 808,659 66,104 30,274 905,037 Total 1,039,413 66,993 32,146 1,138,552 1,003,042 66,176 30,720 1,099,938 On 30 June 2021, Grupo Santander has EUR 502 million (EUR 497 million on 31 December 2020) of exposure in impaired assets purchased with impairment, of which 431 million still show signs of impairment, which mainly correspond to the business combinations carried out by Grupo Santander. b) Impairment allowances of financial assets at amortised cost portfolio The following is the movement that has taken place, during the six -month periods ended 30 June 2021 and 2020, in the balance of provisions that cover losses due to impairment of assets which comprise the heading balance of the financial assets at amortised cost: EUR million 30-06-2021 30-06-2020 Balance as at beginning of period 23,849 22,713 Impairment losses charged to income for the period 4,384 7,441 Of which: Impairment losses charged to income 9,778 12,616 Impairment losses reversed with a credit to income (5,394) (5,175) Write-off of impaired balances against recorded impairment allowance (4,353) (5,183) Exchange differences and other (57) (1,716) Balance as at end of period 23,823 23,255 Of which, relating to: Impaired assets 14,101 13,571 Other assets 9,722 9,684 Of which: Individually calculated 3,077 3,358 Collectively calculated 20,746 19,897 Following is the movement of the loan loss provision broken down by impairment stage of loans and advances to customers recognised under 'Financial assets at amortised cost' as at 30 June 2021 and 30 June 2020: EUR million 30-06-2021 Stage 1 Stage 2 Stage 3 Total Impairment allowance as at beginning of period 4,252 5,672 13,647 23,571 Transfers between stages (474) 747 2,273 2,546 Variation due to credit risk 473 (904) 2,269 1,838 Write-offs — — (4,353) (4,353) Exchange differences and other (104) 33 (2) (73) Carrying amount at end of period 4,147 5,548 13,834 23,529 EUR million 30-06-2020 Stage 1 Stage 2 Stage 3 Total Impairment allowance as at beginning of period 3,835 4,474 13,933 22,242 Transfers between stages (722) 694 2,622 2,594 Variation due to credit risk 2,328 (327) 2,911 4,912 Write-offs — — (5,057) (5,057) Exchange differences and other (333) (290) (1,093) (1,716) Carrying amount at end of period 5,108 4,551 13,316 22,975 Previously written-off assets recovered during the first six months of 2021 and 2020 amount to EUR 599 million and to EUR 543 million, respectively. In addition, during the first six months of 2020 an amount of EUR 129 million was recognized in the account for losses due to renegotiation or contractual modification. Considering these amounts, the recorded impairment of financial assets at amortised cost is EUR 3,785 million and EUR 7,027 million during the first six months of 2021 and 2020, respectively. c) Impaired assets of financial assets at amortised cost portfolio The movement during the six-month periods ended 30 June 2021 and 2020, in the balance of financial assets classified at amortised cost and considered impaired by reason for the credit risk is as follows: EUR million 30-06-2021 30-06-2020 Balance as at beginning of period 31,168 33,184 Net additions 4,842 5,586 Written-off assets (4,353) (5,183) Exchange differences and other 819 (1,407) Balance at end of period 32,476 32,180 This amount, after deducting the related allowances, represents Grupo Santander's best estimate of the discounted value of the flows that are expected to be recovered from the impaired assets. d) Guarantees received Following is the breakdown of the value of the guarantees received to ensure the collection of the financial assets that comprise the heading of financial assets at amortized cost, distinguishing between real guarantees and other guarantees as of 30 June 2021 and 31 December 2020: EUR million 30-06-2021 31-12-2020 Real guarantees value 574,360 537,216 Of which: Impaired 12,239 12,106 Other guarantees value 85,342 82,314 Of which: Impaired 1,751 1,253 Total value of the guarantees received 659,702 619,530 e) Fair value of financial assets not measured at fair value Following is a comparison of the carrying amounts of Grupo Santander’s financial assets measured at other than fair value and their respective fair values at 30 June 2021 and 31 December 2020: EUR million EUR million 30-06-2021 31-12-2020 Carrying amount Fair value Carrying amount Fair value Loans and advances 974,379 981,129 932,300 940,258 Debt instruments 29,038 29,367 26,078 26,532 ASSETS 1,003,417 1,010,496 958,378 966,790 The main valuation methods and inputs used in the estimation of the fair value of the financial assets of the previous table are detailed in Note 50.c of the consolidated annual accounts for the year 2020.

Non-current assets held for sal

Non-current assets held for sale	6 Months Ended
	Jun. 30, 2021
Non-current assets held for sale
Non-current assets held for sale	Non-current assets held for sale The detail, by nature, of Grupo Santander’s non-current assets held for sale at 30 June 2021 and 31 December 2020 is as follows presented by nature: EUR million 30-06-2021 31-12-2020 Tangible assets 4,369 4,445 Of which: Foreclosed assets 3,963 4,081 Of which: Property assets in Spain 3,370 3,485 Other tangible assets held for sale 406 364 Other assets 708 — 5,077 4,445 On 30 June 2021, the allowance recognised for the non-current tangible assets held for sale represented the 47.4% (31 December 2020: 48.0%). The charges recorded in the first six months of 2021 and 2020 amounted to EUR 84 million and EUR 167 million, respectively, and the recoveries undergone during those periods amount to E UR 17 million and EUR 19 million, respectively.

Tangible assets

Tangible assets	6 Months Ended
	Jun. 30, 2021
Property, plant and equipment [abstract]
Tangible assets	Tangible assets a) Changes in the period In the first six months of 2021 and 2020, tangible assets (rights of use are not included) were acquired for EUR 3,363 million and EUR 2,538 million, respectively. Also, in the first six months of 2021 and 2020 tangible asset items were disposed of with a carrying amount of EUR 1,621 million and EUR 848 million respectively, giving rise to a net gain of EUR 52 million and EUR 27 million, respectively. b) Property, plant and equipment purchase commitments At 30 June 2021 and 2020, Grupo Santander did not have any significant commitments to purchase property, plant and equipment items. c) Leasing rights As of 30 June 2021, Grupo Santander has tangible assets under lease for the amount of EUR 2,784 million (EUR 2,837 million at 31 December 2020). d) Tangible asset impairment In the first semester of 2021, EUR 125 million of tangible asset impairment was recognised in the tangible asset impairment line.

Intangible assets

Intangible assets	6 Months Ended
	Jun. 30, 2021
Disclosure of detailed information about intangible assets [abstract]
Intangible assets	Intangible assets The detail of Intangible Assets - Goodwill at 30 June 2021 and 31 December 2020, based on the cash-generating units giving rise thereto, is as follows: EUR million 30-06-2021 31-12-2020 Banco Santander (Brazil) 3,386 3,109 SAM Investment Holdings Limited 1,444 1,444 Santander Consumer Germany 1,314 1,314 Santander Bank Polska 1,114 1,104 Santander Portugal 1,040 1,040 Santander España 1,027 1,027 Santander Consumer USA 935 904 Santander UK 619 592 Santander Bank National Association 614 594 Banco Santander Chile 577 571 Grupo Financiero Santander (Mexico) 414 399 Santander Consumer Nordics 220 216 Other entities 150 157 Total Goodwill 12,854 12,471 During the first half of 2021 there has been an increase in goodwill of EUR 383 million, mainly due to exchange differences (Note 11), which, in accordance with current regulations, have been recognised with a credit to Other comprehensive income - Items that may be reclassified to profit or loss - Foreign currency translation in equity through the condensed consolidated statement of recognised income and expense. Note 17 to the consolidated annual accounts for the year ended 31 December 2020 includes detailed information on the procedures followed by Grupo Santander to analyse the potential impairment of the goodwill recognised with the respect to its recoverable amount and to recognise the related impairment losses, where appropriate. The accounting standard (IAS 36) requires that a cash‑generating unit to which goodwill has been allocated is tested for impairment annually, and whenever there is an indication that the unit may be impaired. Accordingly, based on the analysis performed of the available information on the performance of the various cash-generating units which might evidence the existence of indicators of impairment, Grupo Santander's directors concluded that in the first six months of 2021 there were no impairment losses which required recognition (see Note 1.c.).

Financial liabilities

Financial liabilities	6 Months Ended
	Jun. 30, 2021
Disclosure of financial liabilities [abstract]
Financial liabilities	Financial liabilities a) Breakdown The following is a breakdown of Grupo Santander's financial liabilities, other than the balances corresponding to the Derivatives - hedge accounting heading, as of 30 June 2021 and 31 December 2020, presented by nature and categories for valuation purposes: EUR million 30-06-2021 31-12-2020 Financial Financial Financial Financial Financial Financial Derivatives 52,440 64,469 Short Positions 16,542 16,698 Deposits — 48,640 1,038,892 — 43,598 990,391 Central banks — 3,189 124,947 — 2,490 112,804 Credit institutions — 7,446 57,823 — 6,765 62,620 Customer — 38,005 856,122 — 34,343 814,967 Debt instruments — 5,491 237,739 — 4,440 230,829 Other financial liabilities — — 33,802 — — 26,968 Total 68,982 54,131 1,310,433 81,167 48,038 1,248,188 b) Information on issues, repurchases or redemptions of debt instruments issued The detail of the balance of debt instruments issued according to their nature is: EUR million 30-06-2021 31-12-2020 Bonds and debentures outstanding 194,860 191,577 Subordinated 23,383 21,686 Promissory notes and other securities 24,987 22,006 Total debt instruments issued 243,230 235,269 The detail, at 30 June 2021 and 2020, of the outstanding balance of the debt instruments, excluding promissory notes, which at these dates had been issued by Banco Santander or any other Group entity is disclosed below. Also included is the detail of the changes in this balance in the first six months of 2021 and 2020: EUR million 30-06-2021 Opening Perimeter Issuances or placements Repurchases or Exchange Closing Bonds and debentures outstanding 191,577 — 33,415 (32,496) 2,364 194,860 Subordinated 21,686 — 1,578 — 119 23,383 Bonds and debentures outstanding and subordinated liabilities issued 213,263 — 34,993 (32,496) 2,483 218,243 EUR million 30-06-2020 Opening Perimeter Issuances or placements Repurchases or Exchange Closing Bonds and debentures outstanding 208,455 — 39,109 (36,749) (4,574) 206,241 Subordinated 20,878 — 1,853 (1,615) (639) 20,477 Bonds and debentures outstanding and subordinated liabilities issued 229,333 — 40,962 (38,364) (5,213) 226,718 At 12 May 2021, Banco Santander placed the issue contingently convertible preference shares into newly issued ordinary shares of the Bank, previously announced, for a total nominal amount of EUR 1,578 million, issued in a US Dollar Series of USD 1,000 million (EUR 828 million at the exchange rate on the day of the issue) and a Euro Series of EUR 750 million. The issuance is carried out at par and the remuneration of PPCC, whose payment is subject to certain conditions and is also discretionary, has been fixed (i) for the Dollar Series at 4.750% per annum for the first six years, revised every five years thereafter by applying a margin of 375.3 basis points over the 5-year UST rate (5-year UST) and (ii) for the Euro Series at 4.125% per annum for the first seven years, revised every five years thereafter by applying a margin of 431.1 basis points over the applicable 5-year Euro mid-swap. At 12 March 2020, Banco Santander proceeded to redeem early and voluntarily the entire outstanding issue of Tier 1 Contingently Convertible Preferred Participations Series I/2014, for a total nominal amount of EUR 1,500 million. In January 2020, Banco Santander carried out a placement of contingently convertible preferred participations into newly issued ordinary shares of Banco Santander (the 'PPCCs'), excluding the pre-emptive subscription rights of its shareholders and for a nominal amount of EUR 1,500 million (the 'Issue' and the 'PPCCs'). The Issue was made at par and the remuneration of the PPCCs, the payment of which is subject to certain conditions and is also discretionary, was set at 4.375% per annum for the first six years, revised every five years thereafter by applying a margin of 453.4 basis points over the 5-year Mid-Swap Rate . c) Other issues guaranteed by Grupo Santander At 30 June 2021 and 2020, there were no debt instruments issued by associates or non-Group third parties (unrelated) that had been guaranteed by Banco Santander or any other Group entity. d) Fair value of financial liabilities not measured at fair value Following is a comparison between the value by which Grupo Santander’s financial liabilities are recorded that are measured using criteria other than fair value and their corresponding fair value at 30 June 2021 and 31 December 2020: EUR million 30-06-2021 31-12-2020 Carrying amount Fair value Carrying amount Fair value Deposits 1,038,892 1,037,223 990,391 990,807 Debt instruments 237,739 246,161 230,829 241,174 Liabilities 1,276,631 1,283,384 1,221,220 1,231,981 Additionally, other financial liabilities are accounted for EUR 33,802 million and EUR 26,968 million as of 30 June 2021 and 31 December 2020, respectively.

Provisions

Provisions	6 Months Ended
	Jun. 30, 2021
Disclosure of provision matrix [abstract]
Provisions	Provisions a) Provisions for Pensions and other post-retirements obligations and Other long term employee benefits The variation experienced by the balance of the Pensions and other post-retirements obligations and other long-term employee benefits from 31 December 2020 to 30 June 2021, is mainly due to lower net actuarial losses as a result of changes in actuarial assumptions (see Note 11.d). b) Provisions for taxes and other legal contingencies and Other provisions Set forth below is the detail, by type of provision, of the balances at 30 June 2021 and at 31 December 2020 of Provisions for taxes and other legal contingencies and Other provisions. The types of provision were determined by grouping together items of a similar nature: EUR million 30-06-2021 31-12-2020 Provisions for taxes 609 600 Provisions for employment-related proceedings (Brazil) 432 437 Provisions for other legal proceedings 1,128 1,163 Provision for customer remediation 625 395 Regulatory framework-related provisions 24 69 Provision for restructuring 1,114 810 Other 946 951 4,878 4,425 Relevant information is set forth below in relation to each type of provision shown in the preceding table: The provisions for taxes include provisions for tax-related proceedings. The provisions for employment-related proceedings (Brazil) relate to claims filed by trade unions, associations, the prosecutor's office and ex-employees claiming employment rights to which, in their view, they are entitled, particularly the payment of overtime and other employment rights, including litigation concerning retirement benefits. The number and nature of these proceedings, which are common for banks in Brazil, justify the classification of these provisions in a separate category or as a separate type from the rest. The Group calculates the provisions associated with these claims in accordance with past experience of payments made in relation to claims for similar items. When claims do not fall within these categories, a case-by-case assessment is performed and the amount of the provision is calculated in accordance with the status of each proceeding and the risk assessment carried out by the legal advisers. The provisions for other legal proceedings include provisions for court, arbitration or administrative proceedings (other than those included in other categories or types of provisions disclosed separately) brought against Santander Group companies. The provisions for customer remediation include mainly the estimated cost of payments to remedy errors relating to the sale of certain products in the UK, the estimated cost of the Banco Popular Español, S.A.U. floor clauses and the estimated cost claim's cost made on CHF index-linked loan contracts in Poland. To calculate the provision for customer remediation, the best estimate of the provision made by management is used, which is generally based on the estimated number of claims to be received and, of these, the number that will be accepted, as well as the estimated average payment per case. The regulatory framework-related provisions include mainly the provisions for the extraordinary contribution to Financial Services Compensation Scheme (FSCS) and the Bank Levy in the UK, and those relating to Banking Tax in Poland. The provisions for restructuring include only the direct costs arising from restructuring processes by the various Group companies. Qualitative information on the main litigation is provided in Note 10.c. Our general policy is to record provisions for tax and legal proceedings in which we assess the chances of loss to be probable and we do not record provisions when the chances of loss are possible or remote. We determine the amounts to be provided for as our best estimate of the expenditure required to settle the corresponding claim based, among other factors, on a case-by-case analysis of the facts and the legal opinion of internal and external counsel or by considering the historical average amount of the loss incurred in claims of the same nature. The definitive date of the outflow of resources embodying economic benefits for the Group depends on each obligation. In certain cases, the obligations do not have a fixed settlement term and, in others, they depend on legal proceedings in progress. The changes in provisions arising from civil contingencies and legal nature are disclosed in this note. The main changes in provisions in the first six months of 2021 are as follows: Regarding the provisions for labour processes and others of a legal nature, Brazil has charged EUR 83 million and EUR 69 million, respectively, making payments of EUR 138 million and EUR 131 million, respectively. Regarding the provisions arising for customer remediation Poland has registered EUR 154 million in the six first months of the year in order to cover the mortgage portfolio in CHF. Regarding in provisions constituted by regulatory framework, EUR 46 million in the first six months of 2021 in United Kingdom has been used (Bank Levy and FSCS). In addition, EUR 64 million have been charged and paid in the first six months of 2021 in Poland. In addition, the restructuring provision includes the provisions made mainly in the United Kingdom and Portugal, as well as the payments made by the Group in the first half of the year. c) Litigation and other matters i. Tax-related litigation At 30 June 2021 the main tax-related proceedings concerning the Group were as follows: • Legal actions filed by Banco Santander (Brasil) S.A. and other Group entities to avoid the application of Law 9.718/98, which modifies the basis to calculate PIS and COFINS social contribution, extending it to all the entities income, and not only to the income from the provision of services. In relation of Banco Santander (Brasil) S.A. process, in May 2015 the Federal Supreme Court (FSC) admitted the extraordinary appeal filed by the Federal Union regarding PIS, and dismissed the extraordinary appeal lodged by the Brazilian Public Prosecutor's Office regarding COFINS contribution, confirming the decision of Federal Regional Court favourable to Banco Santander (Brasil) S.A. of August 2007. The appeals filed by the other entities before the Federal Supreme Court, both for PIS and COFINS, are still pending. These claims are fully provisioned. • Banco Santander (Brasil) S.A. and other Group companies in Brazil have appealed against the assessments issued by the Brazilian tax authorities questioning the deduction of loan losses in their income tax returns (IRPJ and CSLL) in relation to different administrative processes of various years on the ground that the requirements under the applicable legislation were not met. The appeals are pending decision in CARF. No provision was recognised in connection with the amount considered to be a contingent liability. • Banco Santander (Brasil) S.A. and other Group companies in Brazil are involved in administrative and legal proceedings against several municipalities that demand payment of the Service Tax on certain items of income from transactions not classified as provisions of services. There are several cases in different judicial instances. A provision was recognised in connection with the amount of the estimated loss. • Banco Santander (Brasil) S.A. and other Group companies in Brazil are involved in administrative and legal proceedings against the tax authorities in connection with the taxation for social security purposes of certain items which are not considered to be employee remuneration. There are several cases in different judicial instances. A provision was recognised in connection with the amount of the estimated loss. • In May 2003 the Brazilian tax authorities issued separate infringement notices against Santander Distribuidora de Títulos e Valores Mobiliarios Ltda. (DTVM, actually Santander Brasil Tecnología S.A.) and Banco Santander (Brasil) S.A. in relation to the Provisional Tax on Financial Movements (CPMF) of the years 2000 to 2002. The administrative discussion ended unfavourably for both companies, and on July 3, 2015, filed a lawsuit requesting the cancellation of both tax assessments. The lawsuit was judged unfavourably in first instance. Therefore, both plaintiffs appealed to the court of second instance. On December 2020, the appeal was decided unfavourably. Against the judgment, the bank filed a motion for clarification which has not been accepted. Currently it is appealed to higher courts. There is a provision recognized for the estimated loss. • In December 2010 the Brazilian tax authorities issued an infringement notice against Santander Seguros S.A. (Brazil), currently Zurich Santander Brasil Seguros e Previdência S.A., as the successor by merger to ABN AMRO Brasil dois Participações S.A., in relation to income tax (IRPJ and CSLL) for 2005, questioning the tax treatment applied to a sale of shares of Real Seguros, S.A. The administrative discussion ended unfavourably, and the CARF decision has been appealed at the Federal Justice. As the former parent of Santander Seguros S.A. (Brasil), Banco Santander (Brasil) S.A. is liable in the event of any adverse outcome of this proceeding. No provision was recognised in connection with this proceeding as it is considered to be a contingent liability. • In November 2014 the Brazilian tax authorities issued an infringement notice against Banco Santander (Brasil) S.A. in relation to corporate income tax (IRPJ and CSLL) for 2009 questioning the tax-deductibility of the amortisation of the goodwill of Banco ABN AMRO Real S.A. performed prior to the absorption of this bank by Banco Santander (Brasil) S.A., but accepting the amortisation performed after the merger. Actually it is appealed before the Higher Chamber of CARF. No provision was recognised in connection with this proceeding as it was considered to be a contingent liability. • Banco Santander (Brasil) S.A. has also appealed against infringement notices issued by the tax authorities questioning the tax deductibility of the amortisation of the goodwill arising on the acquisition of Banco Comercial e de Investimento Sudameris S.A from years 2007 to 2012. No provision was recognised in connection with this matter as it was considered to be a contingent liability. • Banco Santander (Brasil) S.A. and other companies of the Group in Brazil are undergoing administrative and judicial procedures against Brazilian tax authorities for not admitting tax compensation with credits derived from other tax concepts, not having registered a provision for such amount since it is considered to be a contingent liability. • Banco Santander (Brasil) S.A. is involved in appeals in relation to infringement notices initiated by tax authorities regarding the offsetting of tax losses in the CSLL (‘Social Contribution on Net Income’) of year 2009. The appeal is pending decision in CARF. No provision was recognised in connection with this matter as it is considered to be a contingent liability. • Brazilian tax authorities have issued infringement notices against Getnet Adquirência e Serviços para Meios de Pagamentos S.A and Banco Santander (Brasil) S.A. as jointly liable in relation to corporate income tax (IRPJ and CSLL) for 2014 to 2018 questioning the tax-deductibility of the amortization of the goodwill from the acquisition of Getnet Tecnologia Proces S.A., considering that the company would not have complied with the legal requirements for such amortization. A defense against the tax assessment notices was submitted. The notice related to the fiscal years 2014 and 2015 has already been appealed at the CARF, meanwhile the one related to the fiscal years of 2016 to 2018 is pending on judgment. No provision was recognized as it is considered to be a contingent liability. The total amount for the aforementioned Brazil lawsuits that are fully provisioned is EUR 889 million , and for lawsuits that qualify as contingent liabilities is EU R 3,632 million. • Legal action brought by Sovereign Bancorp, Inc. (currently Santander Holdings USA, Inc.) claiming its right to take a foreign tax credit for taxes paid outside the United States in fiscal years 2003 to 2005 as well as the related issuance and financing costs. On 17 July 2018, the District Court finally ruled against Santander Holdings USA, Inc. On September 5, 2019 the Federal District Court in Massachusetts entered a judgement resolving the Company’s tax liability for fiscal years 2003 to 2005, which had no effect on income. The Company has agreed to resolve the treatment of the same transactions for 2006 and 2007, consistent with the September 5, 2019 judgment. The Congressional Joint Committee on Taxation has completed its review of the proposed resolution of the 2006 and 2007 tax years, with no objection. The IRS finalized its administrative process to close-out the issue, which resulted in no impact on net income. • Banco Santander has appealed before European Courts the Decisions 2011/5/CE of 28 October 2009, and 2011/282/UE of 12 January 2011 of the European Commission, ruling that the deduction of the financial goodwill regulated pursuant to Article 12.5 of the Corporate Income Tax Law constituted illegal State aid. On November 2018 the General Court confirmed these Decisions but these judgements have been appealed at the Court of justice of the European Union. The Advocate-General has issued his conclusions proposing the dismissal of the appeal. The dismissal of this appeal would not have effect on equity. At the date of approval of these interim financial statements certain other less significant tax-related proceedings are also in progress. ii. Non-tax-related proceedings At 30 June 2021 the main non-tax-related proceedings concerning the Group were as follows: • Payment Protection Insurance (PPI): claims associated with the sale by Santander UK plc of payment protection insurance or PPI to its customers. At 30 June 2021, the remaining provision for PPI redress and related costs was GBP 37 million (EUR 43 million) (2020: GBP 76 million – EUR 87 million). There was no additional provision in the first semester of 2021. At 30 June 2021, the outstanding activities which drive the ongoing provision requirement relate to the final aspects of complaints close-down activity and the ongoing commercial negotiation with the Official Receiver. Although the deadline for bringing complaints has passed, customers can still commence litigation for PPI mis-selling. Provision has been made for the best estimate of any obligation to pay compensation in respect of current stock and estimated future claims. There are ongoing factual issues to be resolved regarding such litigation which may have legal consequences including the volume and quality of future litigation claims. As a result, the extent of the potential liability and amount of any compensation to be paid continues to have a significant uncertainty component. In relation to a specific PPI portfolio of complaints, there is a legal dispute regarding allocation of liability for pre-2005 PPI policies underwritten by two affiliates (Axa France) that Axa Group acquired from Genworth Financial International Holdings, Inc. in September 2015. The dispute involves a Santander Cards UK Limited (formerly known as GE Capital Bank Limited which was acquired by Banco Santander, S.A. from GE Capital group in 2008) which was the distributor of the refer pre-2005 PPI policies and Santander Insurance Services UK Limited (the Santander Entities). In July 2017, Santander UK plc notified Axa France that the Santander Entities did not accept liability for losses on PPI policies relating to this period, but entered in a Complaints Handling Agreement –that included a standstill agreement- agreeing to handle complaints on Axa affiliates behalf, paying these latter companies redress assessed to be due to relevant policyholders on a without prejudice basis. After the termination of the Complaints Handling Agreement, on 30 December 2020 Axa France has provided written notice to the Santander Entities to terminate the standstill agreement. On 5 March 2021, the Santander Entities were served with a Claim Form and Brief Details of Claim by AXA France, claiming that the Santander Entities are liable to reimburse AXA France for pre-2005 PPI mis-selling losses, currently estimated at GBP 636 million (EUR 739 million). On 22 March 2021, the Santander Entities acknowledged service of the claim and notified the court of their intention to defend the claim in full and have issued an application for Axa Frances’s claim to be struck out/summarily dismissed. This dispute is at an early stage and there are ongoing factual issues to be resolved which may have legal consequences including in relation to liability. These issues create uncertainties which mean that it is difficult to reliably predict the outcome or the timing of the resolution of the matter. The regulatory and other provision includes our best estimate of the Santander UK’s liability to PPI and portfolio claims. • Delforca: dispute arising from equity swaps entered into by Gaesco (now Delforca 2008, S.A.) on shares of Inmobiliaria Colonial, S.A. Banco Santander, S.A. is claiming to Delforca before the Court of Barcelona in charge of the bankruptcy proceedings, a total of EUR 66 million from the liquidation resulting from the early termination of financial transactions due to Delforca's non-payment of the equity swaps. In the same bankruptcy proceedings, Delforca and Mobiliaria Monesa have in turn claimed the Bank to repay EUR 56.8 million, which the Bank received for the enforcement of the agreed guarantee, as a result of the aforementioned liquidation. The procedure in its first instance, in which the two crossed claims will be resolved, is completed pending judgement. In 2009, Mobiliaria Monesa, S.A. (parent of Delforca) filed a civil procedure with the Courts of Santander against the Bank claiming damages that have not been specified to date. The procedure is suspended. • Former employees of Banco do Estado de São Paulo S.A., Santander Banespa, Cia. de Arrendamiento Mercantil: a claim was filed in 1998 by the association of retired Banespa employees (AFABESP) requesting the payment of a half-yearly bonus contemplated in the by-laws of Banespa in the event that Banespa obtained a profit and that the distribution of this profit were approved by the Board of Directors. The bonus was not paid in 1994 and 1995 since Banespa had not made a profit during those years. Partial payments were made from 1996 to 2000, as approved by the Board of Directors. The relevant clause was eliminated in 2001. The Regional Labour Court and the High Employment Court (TST) ordered Santander Brasil, as successor to Banespa, to pay this half-yearly bonus for the period from 1996 to the present. On 20 March 2019, the Supreme Federal Court (STF) rejected the extraordinary appeal filed by Banco Santander Brasil. The Bank filed a rescissory action to nullify the decisions of the main proceedings and suspend the execution of the judgment, which was deemed inadmissible, therefore its execution was suspended. The rescissory action was dismissed and a motion for clarification was filed, due to the absence of an explicit argument to deny the rescissory action filed by the Bank. After the decision of the motion for clarification, the Bank filled an extraordinary appeal in the rescissory action in February 2021, which was denied in an interlocutory decision in June 2021 by the TST. As the Bank understands that there is a conflict between the TST decision and the STF, an appeal will be made. At this moment we have the legal opinion of the bank's external advisers, who have classified the risk as probable. The recorded provisions are considered sufficient to cover the risks associated with the legal claims that are being substantiated as of today. • 'Planos Económicos': like the rest of the banking system in Brasil, Santander Brasil has been the target of customer complaints and collective civil suits stemming from legislative changes and its application to bank deposits, fundamentally ('economic plans'). At the end of 2017, there was an agreement between regulatory entities and the Brazilian Federation of Banks (Febraban), already approved by the Supremo Tribunal Federal, with the purpose of closing the lawsuits. Discussions focused on specifying the amount to be paid to each affected client according to the balance in their notebook at the time of the Plan. Finally, the total value of the payments will depend on the number of endorsements they have made and the number of savers who have demonstrated the existence of the account and its balance on the date the indexes were changed. In November 2018, the STF ordered the suspension of all economic plan processes for two years from May 2018. On 29 May 2020, the Supremo Tribunal Federal approved the extension of the agreement for 5 additional years starting from 3 June 2020. Condition for this extension was to include in the agreement actions related to the “Collor I Plan”. The provisions recorded for the economic plan processes are considered to be sufficient. The provisions recorded for the economic plan processes are considered to be sufficient. • Floor clauses: in consequence of the acquisition of Banco Popular Español, S.A.U, the Group has been exposed to a material number of transactions with floor clauses. The so-called "floor clauses" or minimum clauses are those under which the borrower accepts a minimum interest rate to be paid to the lender, regardless of the applicable reference interest rate. Banco Popular Español, S.A.U. included "floor clauses" in certain asset transactions with customers. In relation to this type of clauses, and after several rulings made by the Court of Justice of the European Union and the Spanish Supreme Court, and the extrajudicial process established by the Spanish Royal Decree-Law 1/2017, of 2 January, Banco Popular Español, S.A.U. made extraordinary provisions that were updated in order to cover the effect of the potential return of the excess interest charged for the application of the floor clauses between the contract date of the corresponding mortgage loans and May 2013. The Group considered that the maximum risk associated with the floor clauses applied in its contracts with consumers, in the most severe and not probable scenario, would amount to approximately EUR 900 million, as initially measured and without considering the returns performed. At 30 June 2021, after having processed most of the customer requests, the potential residual loss associated with ongoing court proceedings is estimated at EUR 49.6 million, amount which is fully covered by provisions. • Banco Popular´s acquisition: considering the declaration setting out the resolution of Banco Popular Español, S.A.U., the redemption and conversion of its capital instruments and the subsequent transfer to Banco Santander, S.A. of the shares resulting from this conversion in exercise of the resolution instrument involving the sale of the institution's business, in the application accordance with the single resolution framework regulation referred to in Note 3 of the 2018 consolidated annual accounts, some investors have filed claims against the EU’s Single Resolution Board decision, the FROB's resolution executed in accordance to the aforementioned decision, and claims have been filed and may be filed in the future against Banco Santander, S.A. or other Santander Group companies deriving from or related to the acquisition of Banco Popular Español, S.A.U.. At this stage, it is not possible to foresee the total number of claims that could be filed by the former holders of shares and capital instruments (arising from the acquisition by investors of such shares and capital instruments of Banco Popular prior to resolution, including in particular, without limitation, the shares acquired in the context of the capital increase with pre-emptive subscription rights carried out in 2016), and their economic implications (especially considering that the decision to resolve in application of the new regulation has no precedent, and that it may be possible that future claims do not specify a specific amount, put forward new legal interpretations or involve a large number of parties). In this respect, on 2 September 2020, the Provincial Court of La Coruña has referred a preliminary ruling to the Court of Justice of the European Union (“CJEU”) asking for the correct interpretation of Article 60(2) of Directive 2014/59/EU of the European Parliament and of the Councill, dated 15 May 2014, which establishes a framework for the restructuring and resolution of credit institutions and investment firms. This article establishes that, in cases of redemption of capital instruments in a bank resolution, no liability shall remain in relation to the amount of the instrument that has been redeemed. The judgement given by the CJEU in this case is likely to condition the outcome on the judicial proceedings that are currently open. The estimated cost of any compensation to shareholders and bondholders of Banco Popular recognized in the 2017 accounts amounted to EUR 680 million, of which EUR 535 million were applied to the commercial loyalty program. The provisions recorded are considered sufficient to cover the risks associated with the court claims that can be estimated to date. However, if additional amounts have to be paid for claims already raised with an undetermined economic interest or for new claims, this could have a significant adverse effect on the Santander Group's results and financial situation. Likewise, the Central Court of Instruction 4 is currently conducting preliminary proceedings 42/2017, in which, amongst other things, is being investigated the following: (i) the accuracy of the prospectus for the capital increase with pre-emptive subscription rights carried out by Banco Popular in 2016; and (ii) the alleged manipulation of the share price of Banco Popular until the resolution of the bank, in June 2017. During the course of the proceedings, on 30 April 2019, the Spanish National Court, ruled in favour of Banco Santander, S.A. declaring that Banco Santander, S.A. cannot inherit Banco Popular’s potential criminal liability. This ruling was appealed before the Supreme Court who have rejected the appeal. In this procedure, Banco Santander has the status of possible subsidiary civil liability. • German shares investigation: the Cologne Public Prosecution Office is conducting an investigation against the Bank, and other group entities based in UK - Santander UK plc, Santander Financial Services Plc and Cater Allen International Limited -, in relation to a particular type of tax dividend linked transactions known as cum-ex transactions. The Group is cooperating with the German authorities. According to the state of the investigations, the result and the effects for the Group, which may potentially include the imposition of financial penalties, cannot be anticipated. For this reason, the Bank has not recognized any provisions in relation to the potential imposition of financial penalties. • IRPH Index: a portion of our Spanish mortgage loan portfolio bears interest at a rate indexed to the “Índice de Referencia de Préstamos Hipotecarios” known as “IRPH,” which, at the time the contracts were entered into, served as reference rate for many mortgage loan agreements in Spain and was published by the Bank of Spain. Consumers in Spain have brought lawsuits against most of the Spanish banking sector alleging that the use and related disclosures of such rate did not comply with the transparency requirements of European regulation. On 14 December 2017, the Supreme Court of Spain ruled that these clauses were valid, as the IRPH is an official rate and therefore non-subject to transparency requirements. The matter was referred to the Court of Justice of the European Union through a preliminary ruling procedure. On 3 March 2020 the CJEU rendered its decision. The CJEU ruled that, being the IRPH a valid index, national courts are entitled to examine its use on each particular contract in order to verify whether the transparency requirements have been met. When carrying out the transparency control, national courts have to take into account all the circumstances surrounding the conclusion of the particular contract, including whether essential information relating to the calculation of that rate was easily accessible and the provision of data relating to past fluctuations of the index. Finally, with regards to the effects of nullity of an IRPH index clause, the CJUE entitles national courts to substitute it with another statutory index, thus not declaring the nullity of the whole contract. On 12 November 2020, the Supreme Court has issued four judgments applying the doctrine established by the CJUE that resolve individual appeals in which the validity of the IRPH clauses was questioned. The Court understands that in those cases there is a lack of transparency because the financial institutions had not been able to prove the delivery to the client of the information on the evolution of the index in the two years prior to the contract. However, the Supreme Court reminds that the lack of transparency does not automatically imply the invalidity of the clause, but rather it is necessary to analyze whether this lack of transparency generates abusiveness. The Supreme Court resolves that in the case of the IRPH, that specific lack of transparency does not mean that the clause is abusive to the detriment of the client, so the clause is valid and fully applicable. Currently, the balance of the relevant mortgage indexed to IRPH loans held by the Group, equals approximately EUR 2.8 billion. • Banco Santander, S.A. has been sued in a legal proceeding in which the plaintiff alleges that a contract was concluded whereby he would be entrusted with the functions of CEO of the Bank. In the complaint, the claimant mainly requests a declaratory ruling that affirms the validity and conclusion of such contract and its enforcement together with the payment of certain amounts. If the main request is not granted, the claimant seeks compensation for a total amount of approximately EUR 112 million or, an alternative relief for other minor amounts. Banco Santander, S.A. has answered to the complaint. In this answer, it is stated that the conditions to which the appointment was subject to were not met and that the contract required by law was not concluded. The trial took place on 19 May 2021. The claimant waived specific performance of the alleged contract. The trial was suspended because of two witnesses' failure to appear and it will begin again when a new date for hearing their evidence is agreed. • Universalpay Entidad de Pago, S.L. has filed a lawsuit against Banco Santander, S.A. for breach of the marketing alliance agreement (MAA) and in claim of quantity. The claim is processed in the Court of First Instance no. 81 of Madrid, ordinary procedure 156/2021. The MAA was originally subscribed by Banco Popular Español, S.A.U. and its purpose is the business of acquiring services for businesses in the Spanish market. The lawsuit is mainly based on the potential breach of clause 6 of the MAA, which establishes certain obligations of exclusivity, non-competition and customer reference. The claim is at a very early stage, and there are factual issues pending resolution, which may have legal consequences and affect eventual liability. This uncertainty makes it impossible to reliably predict the resolution of the issue, the timing or the significance of the potential impact. The Bank has answered the complaint. The pretrial hearing is scheduled for 16 December 2021. • CHF Polish Mortgage Loans: On 3 October 2019, the Court of Justice of the European Union (CJEU) rendered its decision in relation to a lawsuit against an unrelated bank in Poland, with regards to unfair contractual clauses in consumer agreements, specifically the consequences of potentially unfair contractual clauses in CHF-indexed loan agreements. The CJEU has left to Polish courts the decision on whether the whole contract can be maintained once the abusive terms have been removed, which should in turn decide whether the effects of the annulment of the contract are prejudicial to the consumer. In that case, the court may only integrate the contract with default provisions of national law and decide, in accordance with those provisions, on the applicable rate. In December 2020, the Chairman of the Financial Supervision Authority announced a high-level proposal for voluntary settlements between banks and borrowers

Equity

Equity	6 Months Ended
	Jun. 30, 2021
Equity [abstract]
Equity	Equity In the six-month periods ended 30 June 2021 and 2020 there were no quantitative or qualitative changes in Grupo Santander's equity other than those indicated in the condensed consolidated statements of changes in total equity. a) Capital As of 30 June 2021 and 31 December 2020 , the Bank's capital stock was represented by 17,340,641,302 shares, with a nominal amount of EUR 8,670 milli on, in both dates. b) Share premium The decreased produced in the first semester of 2021 for an amount of EUR 4,034 million has been the consequence of applying the result obtained by Banco Santander during the financial year 2020, consisting of losses of EUR 3,557 million, as reflected in the consolidated statements of changes in total equity, and the charge of the dividend for fiscal year 2020 for an amount of EUR 477 million (Note 3 and consolidated statements of changes in total equity). c) Breakdown of other comprehensive income - Items not reclassified to profit or loss and Items that may be reclassified to profit or loss EUR million 30-06-2021 31-12-2020 Other comprehensive income accumulated (32,181) (33,144) Items not reclassified to profit or loss (4,962) (5,328) Actuarial gains or losses on defined benefit pension plans (4,415) (5,002) Non-current assets held for sale — — Share in other income and expenses recognised in investments, joint ventures and associates (11) (2) Other valuation adjustments — — Changes in the fair value of equity instruments measured at fair value with changes in other comprehensive income (428) (308) Inefficacy of fair value hedges of equity instruments measured at fair value with changes — — Changes in the fair value of equity instruments measured at fair value with changes 213 159 Changes in the fair value of equity instruments measured at fair value with changes (213) (159) Changes in the fair value of financial liabilities measured at fair value through profit or loss (108) (16) Items that may be reclassified to profit or loss (27,219) (27,816) Hedge of net investments in foreign operations (effective portion) (4,125) (3,124) Exchange differences (24,032) (26,911) Hedging derivatives (effective portion) 126 295 Changes in the fair value of debt instruments measured at fair value with changes in other comprehensive income 1,250 2,411 Hedging instruments (items not designated) — — Non-current assets held for sale — — Share in other income and expenses recognised in investments, joint ventures and associates (438) (487) d) Other comprehensive income - Items not reclassified to profit or loss - Actuarial gains or losses on defined benefit pension plans The changes in the balance of Other comprehensive income - Items not reclassified to profit or loss - Actuarial gains or losses on defined benefit pension plans include the actuarial gains or losses generated in the period and the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset), less the administrative expenses and taxes inherent to the plan, and any change in the effect of the asset ceiling. Its variation is shown in the condensed consolidated statement of recognised income and expense. During the first six months of 2021, the amount of actuarial losses (net of actuarial gains) has decreased by EUR 885 million. The main impacts are: • Decrease of EUR 865 million in the accrued actuarial losses relating to Grupo Santander's businesses in the United Kingdom, mainly due to the change in the discount rate (increase from 1.28% to 1.91%), partially offset by the change in the inflation rate (increase from 2.95% to 3.24%) and the change in assets. • Decrease of EUR 49 million in the accrued actuarial losses relating to Grupo Santander's businesses in the Spain, due to the change in the discount rate (increase from 0.60% to 0.90%). • Decrease of EUR 41 million in the accrued actuarial losses relating to Grupo Santander's businesses in Germany, due to the change in the discount rate (increase from 1.17% to 1.56%). • Decrease of EUR 36 million in accumulated actuarial losses for the Group's businesses in Brazil, due to the change in the discount rate (increase from 3.46% to 4.20% for pension plans and from 3.77% to 4.31% for medical plans). The remaining variation in the accrued actuarial gains and losses heading represents an increase of EUR 106 million, mainly as a result of the evolution of exchange rates, being the appreciation of the pound and the depreciation of the Brazilian Real the most significant. e) Other comprehensive income - Items not reclassified to profit or loss – Changes in the fair value of equity instruments measured at fair value with changes in other comprehensive income Includes the net amount of unrealised fair value changes in equity instruments at fair value with changes in other comprehensive income. Below is a breakdown of the composition of the balance as of 30 June 2021 and 31 December 2020 under “Other comprehensive income - Items not reclassified to profit or loss - Changes in the fair value of equity instruments measured at fair value with changes in other global result depending on the geographical origin of the issuer”: EUR million 30-06-2021 31-12-2020 Revaluation gains Revaluation losses Net revaluation gains/(losses) Fair value Revaluation gains Revaluation losses Net revaluation gains/(losses) Fair value Equity instruments Domestic Spain 28 (1,102) (1,074) 773 28 (849) (821) 1,032 International Rest of Europe 118 (75) 43 410 65 (76) (11) 314 United States 12 (4) 8 32 7 (4) 3 25 Latin America and rest 601 (6) 595 1,536 525 (4) 521 1,412 759 (1,187) (428) 2,751 625 (933) (308) 2,783 Of which: Listed 606 (31) 575 1,571 525 (31) 494 1,424 Unlisted 153 (1,156) (1,003) 1,180 100 (902) (802) 1,359 f) Other comprehensive income - Items that may be reclassified to profit or loss – Hedges of net investments in foreign operations (effective portion) and exchange differences Other comprehensive income - Items that may be reclassified to profit or loss - Hedges of net investments in foreign operations (effective portion) includes the net amount of the changes in value of hedging instruments in hedges of net investments in foreign operations, in respect of the portion of these changes considered to be effective hedges. Other comprehensive income - Items that may be reclassified to profit or loss - Exchange differences includes the net amount of exchange differences arising on non-monetary items whose fair value is adjusted against equity and the differences arising on the translation to euros of the balances of the consolidated entities whose functional currency is not the euro. The net variation of both headings recognised during the first semester of 2021, recorded in the statement of income and expenses reflects the impact of the currencies' evolution during the year, reflecting the appreciation of the Brazilian Real, pound sterling, US dollar, Chilean peso, Mexican peso, mainly (see note 1.e). Of this variation, EUR 347 million correspond to the valuation at the closing exchange rate of goodwill for the first semester of the year (see note 8). g) Other comprehensive income – Items that may be reclassified to profit or loss – Changes in the fair value of debt instrument s measured at fair value through other comprehensive income Includes the net amount of unrealised fair value changes in debt instruments at fair value through other comprehensive income. Below is a breakdown of the composition of the balance as of 30 June 2021 and 31 December 2020 under Other comprehensive income - Items that may be reclassified to profit or loss - Changes in the fair value of debt instruments measured at fair value through other comprehensive income depending on the type of instrument and the geographical origin of the issuer: EUR million 30-06-2021 31-12-2020 Revaluation gains Revaluation losses Net revaluation gains/(losses) Fair value Revaluation gains Revaluation losses Net revaluation gains/(losses) Fair value Debt instruments Government and central banks Spain 414 — 414 14,416 693 — 693 19,314 Rest of Europe 702 (38) 664 23,326 915 (69) 846 23,116 Latin America and rest of the world 420 (323) 97 50,308 785 (73) 712 51,026 Private-sector debt instruments 117 (42) 75 23,704 181 (21) 160 24,714 1,653 (403) 1,250 111,754 2,574 (163) 2,411 118,170

Segment Information (Primary se

Segment Information (Primary segment)	6 Months Ended
	Jun. 30, 2021
Disclosure of operating segments [abstract]
Segment Information (Primary segment)	Segment information (Primary segment) Grupo Santander has aligned the information in this note with the underlying information used internally for management reporting and with that presented in Grupo Santander's other public documents. Grupo Santander executive committee has been determined to be the chief operating decision maker. Grupo Santander's operating segments reflect its organizational and managerial structures. Grupo Santander 's executive committee reviews internal reporting based on these segments to assess performance and allocate resources. The segments are split by geographic area in which profits are earned and type of business. Grupo Santander prepares the information by aggregating the figures for Grupo Santander’s various geographic areas and business units, relating it to both the accounting data of the units integrated in each segment and that provided by management information systems. The general principles applied are the same as those used in Grupo Santander. On 9 April 2021, Grupo Santander has announced that, starting and effective with the financial information for the first quarter of 2021, a change was made to the reportable segments to reflect the new reporting structure. For Grupo Santander management purposes, the primary level of segmentation, which is based on Grupo Santander's management structure, comprises five reportable segments: four operating areas plus the Corporate Centre. The operating areas are: Europe, North America, South America and Digital Consumer Bank. The operating areas of the main level segmentation are: • Europe: which comprises all the business activities carried out in the region, except for the business included in Digital Consumer Bank. Mainly in Spain, the United Kingdom, Portugal and Poland. • North America: which comprises all the business activities carried out in Mexico and the US, which includes the holding company (SHUSA) and the businesses of Santander Bank, Santander Consumer USA, the specialized unit Banco Santander International, Santander Investment Securities (SIS) and the New York branch. • South America: includes all the financial activities carried out by Grupo Santander through its banks in the region, mainly in Brazil, Chile and Argentina. • Digital Consumer Bank: includes Santander Consumer Finance, which incorporates the entire consumer finance business in Europe, Openbank and ODS. Following is the breakdown of revenue that is deemed to be recognised under Dividend income, Commission income, Gain or losses on financial assets and liabilities not measured at fair value through profit or loss, net, Gain or losses on financial assets and liabilities held for trading, net, Gain or losses on non-trading financial assets and liabilities mandatorily at fair value through profit or loss, Gain or losses on financial assets and liabilities measured at fair value through profit or loss, net, Gain or losses from hedge accounting, net, Other operating income and Income from assets under insurance and reinsurance contracts in the accompanying consolidated income statements for the six-month period ended 30 June 2021 and 2020. In addition to these operating units, which report by geographic area and businesses, Grupo Santander continues to maintain the area of Corporate Centre, that includes the centralized activities relating to equity stakes in financial companies, financial management of the structural exchange rate position, assumed within the sphere of Grupo Santander's assets and liabilities committee, as well as management of liquidity and of shareholders' equity via issuances. This financial information ('underlying basis') is computed by adjusting reported results for the effects of certain gains and losses (e.g.: capital gains, write-downs, etc.). These gains and losses are items that management and investors ordinarily identify and consider separately to understand better the underlying trends in the business. Following is the reconciliation between the adjusted profit and the statutory profit corresponding to the six-month period ended 30 June 2021 and 2020: EUR million Revenue from ordinary activities Profit before taxes Profit Segment 30-06-2021 30-06-2020 30-06-2021 30-06-2020 30-06-2021 30-06-2020 Europe 10,862 10,866 2,151 800 1,426 529 North America 7,315 8,315 2,545 878 1,628 616 South America 10,580 12,902 3,113 2,460 1,645 1,382 Digital Consumer Bank 3,245 3,119 1,008 889 569 507 Corporate Centre (168) 165 (1,188) (1,185) (1,063) (1,125) Underlying Profit 31,834 35,368 7,629 3,842 4,205 1,909 Adjustments — — (715) (10,252) (530) (12,707) Statutory Profit 31,834 35,368 6,914 (6,410) 3,675 (10,798) Explanation of adjustments: In the first six months of 2021, the impact of restructuring costs of EUR -530 million was mainly in the United Kingdom and Portugal. In the first six months of 2020, an adjustment to goodwill arising from the Group´s acquisitions of EUR -10,100 million is included together with the valuation of tax assets adjustment of EUR -2,500 million, as well as restructuring and other costs of EUR -106 million: EUR -55 million in the United Kingdom, EUR -28 million in Santander Consumer Finance, EUR -10 million in Poland and EUR -13 million in Other Europe.

Related parties

Related parties	6 Months Ended
	Jun. 30, 2021
Disclosure of transactions between related parties [abstract]
Related parties	Related parties The parties related to Grupo Santander are deemed to include, in addition to its subsidiaries, associates and jointly controlled entities, Banco Santander’s key management personnel (the members of its board of directors and the executive vice presidents, together with their close family members) and the entities over which the key management personnel may exercise significant influence or control. Following is a detail of the transactions performed by Grupo Santander with its related parties in the first six months of 2021 and 2020, distinguishing between significant shareholders, members of Banco Santander’s board of directors, Banco Santander’s executive vice presidents, Grupo Santander entities and other related parties. Related party transactions were made on terms equivalent to those that prevail in arm’s-length transactions or, when this was not the case, the related compensation in kind was recognised: EUR million 30-06-2021 Expenses and income Significant shareholders Directors and executives Group companies or entities Other related parties Total Expenses Finance costs — — 4 — 4 Leases — — — — — Services received — — — — — Purchases of stocks — — — — — Other expenses — — 44 — 44 — — 48 — 48 Income Finance income — — 44 1 45 Dividends received — — — — — Services rendered — — — — — Sale of stocks — — — — — Other income — — 613 — 613 — — 657 1 658 EUR million 30-06-2021 Other transactions Significant shareholders Directors and executives Group companies or entities Other related parties Total Financing agreements: loans and capital contributions (lender) — (1) 492 (32) 459 Financing agreements: loans and capital contributions (borrower) — 3 (503) 81 (419) Guarantees provided — — — — — Guarantees received — — — — — Commitments acquired — — (38) 6 (32) Dividends and other distributed profit — 1 — 5 6 Other transactions — — (7) — (7) EUR million 30-06-2021 Balance closing period Significant shareholders Directors and executives Group companies or entities Other related parties Total Debt balances: Customers and commercial debtors — — — — — Loans and credits granted — 20 7,988 21 8,029 Other collection rights — — 963 — 963 — 20 8,951 21 8,992 Credit balances: Suppliers and creditors granted — — — — — Loans and credits received — 19 2,998 237 3,254 Other payment obligations — — 85 — 85 — 19 3,083 237 3,339 EUR million 30-06-2020 Expenses and income Significant shareholders Directors and executives Group companies or entities Other related parties Total Expenses Finance costs — — 4 — 4 Leases — — — — — Services received — — — — — Purchases of stocks — — — — — Other expenses — — 15 — 15 — — 19 — 19 Income Finance income — — 58 — 58 Dividends received — — — — — Services rendered — — — — — Sale of stocks — — — — — Other income — — 548 — 548 — — 606 — 606 EUR million 30-06-2020 Other transactions Significant shareholders Directors and executives Group companies or entities Other related parties Total Financing agreements: loans and capital contributions (lender) — (1) (324) (8) (333) Financing agreements: loans and capital contributions (borrower) — (14) 148 30 164 Guarantees provided — — (1) — (1) Guarantees received — — — — — Commitments acquired — (1) (83) 5 (79) Dividends and other distributed profit — — — — — Other transactions — — (1,010) — (1,010) EUR million 31-12-2020 Balance closing period Significant shareholders Directors and executives Group companies or entities Other related parties Total Debt balances: Customers and commercial debtors — — — — — Loans and credits granted — 24 7,497 95 7,616 Other collection rights — — 976 — 976 — 24 8,473 95 8,592 Credit balances: Suppliers and creditors granted — — — — — Loans and credits received — 20 3,501 159 3,680 Other payment obligations — — 92 — 92 — 20 3,593 159 3,772

Off-balance-sheet exposures

Off-balance-sheet exposures	6 Months Ended
	Jun. 30, 2021
Off-balance-sheet exposures
Off-balance-sheet exposures	Off - balance-sheet exposures The off-balance-sheet exposures related to balances representing loans commitments, financial guarantees and other commitments granted (recoverables and non recoverables). Financial guarantees granted include financial guarantees contracts such as financial bank guarantees, credit derivatives, and risks arising from derivatives granted to third parties; non-financial guarantees include other guarantees and irrevocable documentary credits. Loan and other commitments granted include all off-balance-sheet exposures, which are not classified as guarantees provided, including loans commitment granted. EUR million 30-06-2021 31-12-2020 Loan commitments granted 247,154 241,230 Of which impaired 249 274 Financial guarantees granted 12,121 12,377 Of which impaired 174 124 Bank sureties 12,079 12,358 Credit derivatives sold 42 19 Other commitments granted 81,277 64,538 Of which impaired 703 548 Other granted guarantees 38,250 33,526 Other 43,027 31,012 The breakdown of the off-balance sheet exposure and impairment on 30 June 2021 and 31 December 2020 by impairment stages is EU R 331,602 million and EUR 310,435 million of exposure and EUR 331 million and EUR 377 million of impairment in stage 1, EUR 7,824 million and EUR 6,764 million of exposure and EUR 177 million and EUR 182 million of impairment in stage 2, and EUR 1,126 million and EUR 946 million of exposure and EUR 153 million and EUR 141 million of impairment in stage 3, respectively.

Average headcount and number of

Average headcount and number of branches	6 Months Ended
	Jun. 30, 2021
Average headcount and number of offices
Average headcount and number of branches	Average headcount and number of branches The average number of employees at Banco Santander and Grupo Santander, by gender, in the six-month periods ended 30 June 2021 and 2020 is as follows: Average headcount Bank Group 30-06-2021 30-06-2020 30-06-2021 30-06-2020 Men 12,682 13,942 87,382 88,763 Women 11,979 12,681 103,108 106,398 24,661 26,623 190,490 195,161 The number of branches at 30 June 2021 and 31 December 2020 is as follow: Number of branches Group 30-06-2021 31-12-2020 Spain 1,997 2,989 Group 8,076 8,247 10,073 11,236

Other disclosures

Other disclosures	6 Months Ended
	Jun. 30, 2021
Other disclosures
Other disclosures	Other disclosures a) Valuation techniques for financial assets and liabilities The following table shows a summary of the fair values, at 30 June 2021 and 31 December 2020, of the financial assets and liabilities indicated below, classified on the basis of the various measurement methods used by Grupo Santander to determine their fair value: EUR million 30-06-2021 31-12-2020 Published price quotations in active markets (Level 1) Internal models (Levels 2 and 3) Total Published price quotations in active markets (Level 1) Internal models (Levels 2 and 3) Total Financial assets held for trading 46,807 55,985 102,792 46,379 68,566 114,945 Non-trading financial assets mandatorily at fair value through profit or loss 2,129 2,709 4,838 1,756 2,730 4,486 Financial assets at fair value through profit and loss 2,243 54,243 56,486 2,509 46,208 48,717 Financial assets at fair value through other comprehensive income 86,515 27,990 114,505 91,771 29,182 120,953 Hedging derivatives (assets) — 5,430 5,430 — 8,325 8,325 Financial liabilities held for trading 12,862 56,120 68,982 9,863 71,304 81,167 Financial liabilities designated at fair value through profit or loss 3,451 50,680 54,131 2,118 45,920 48,038 Hedging derivatives (liabilities) — 6,573 6,573 — 6,869 6,869 Liabilities under insurance contracts — 1,014 1,014 — 910 910 Financial instruments at fair value, determined on the basis of published price quotations in active markets (level 1), include government debt instruments, private-sector debt instruments, derivatives traded in organised markets, securitised assets, shares, short positions and fixed-income securities issued. In cases where price quotations cannot be observed, management makes its best estimate of the price that the market would set, using its own internal models. In most cases, these internal models use data based on observable market parameters as significant inputs (level 2) and, in some cases, they use significant inputs not observable in market data (level 3). In order to make these estimates, various techniques are employed, including the extrapolation of observable market data. The best evidence of the fair value of a financial instrument on initial recognition is the transaction price, unless the fair value of the instrument can be obtained from other market transactions performed with the same or similar instruments or can be measured by using a valuation technique in which the variables used include only observable market data, mainly interest rates. During the first six months of 2020 and 2021 , Grupo Santander did not make any material transfers of financial instruments between measurement levels other than the transfers included in level 3 table. Grupo Santander has developed a formal process for the sy stematic valuation and management of financial instruments, which has been implemented worldwide across all Grupo Santander 's units. The governance scheme for this process distributes responsibilities between two independent divisions: Treasury (development, marketing and daily management of financial products and market data) and Risk (on a periodi c basis, validation of pricing models and market data, computation of risk metrics, new transaction approval policies, management of market risk and implementation of fair value adjustment policies). The approval of new products follows a sequence of steps (request, development, validation, integration in corporate systems and quality assurance) before the product is brought into production. This process ensures that pricing systems have been properly reviewed and are stable before they are used. The most important products and families of derivatives, and the related valuation techniques and inputs, by asset class, are detailed in the consolidated annual accounts as at 31 December 2020. As of 30 June 2021, the CVA (Credit Valuation Adjustment) accounted for was EU R 251.9 million (a reduction of 26.6% compared to 31 December 2020) and adjustments of DVA (Debt Valuation Adjustment) was EU R 169.9 mi llion (a reduction o f 13.4% c ompared to 31 December 2020). The movement is due to the fact that credit spread levels have been reduced by around 12% co mpared to year-end. Currently the CVA and DVA are at similar levels compared to the beginning of the pandemic. Set forth below are the financial instruments at fair value whose measurement was based on internal models (levels 2 and 3) at 30 June 2021 and 31 December 2020: EUR million EUR million Fair values calculated using internal models at 30-06-2021(*) Fair values calculated using internal models at 31-12-2020 (*) Level 2 Level 3 Level 2 Level 3 Valuation techniques Main inputs ASSETS 137,823 8,534 146,468 8,543 Financial assets held for trading 55,374 611 67,826 740 Credit institutions — — 3 — Present value method Yield curves, FX market prices Customers (**) 265 — 296 — Present value method Yield curves, FX market prices Debt instruments and equity instruments 1,214 22 1,453 10 Present value method Yield curves, FX market prices Derivatives 53,895 589 66,074 730 Swaps 44,666 233 54,488 272 Present value method, Gaussian Copula (***) Yield curves, FX market prices, HPI, Basis, Liquidity Exchange rate options 451 33 696 22 Black-Scholes Model Yield curves, Volatility surfaces, FX market prices, Liquidity Interest rate options 2,429 185 3,129 241 Black's Model, multifactorial advanced models interest rate Yield curves, Volatility surfaces, FX market prices, Liquidity Interest rate futures 501 — 1,069 — Present value method Yield curves, FX market prices Index and securities options 667 66 554 94 Black’s Model, multifactorial advanced models interest rate Yield curves, Volatility surfaces, FX & EQ market prices, Dividends, Liquidity. Other 5,181 72 6,138 101 Present value method, Advanced stochastic volatility models and other Yield curves, Volatility surfaces, FX and EQ market prices, Dividends, Liquidity, Dividends, Correlation, HPI, Credit, Others. Hedging derivatives 5,430 — 8,325 — Swaps 5,150 — 6,998 — Present value method Yield curves, FX market prices, Basis Interest rate options 24 — 25 — Black-Scholes Model Yield curves, FX market prices, Volatility surfaces, Liquidity Other 256 — 1,302 — Present value method, Advanced stochastic volatility models and other Yield curves, Volatility surfaces, FX market prices, Credit, Liquidity, Others Non-trading financial assets mandatorily at fair value through profit or loss 1,240 1,469 1,796 934 Equity instruments 428 1,053 984 505 Present value method Market price, Interest rates curves, Dividends and Others Debt instruments 657 150 555 134 Present value method Yield curves Loans and receivables (**) 155 266 257 295 Present value method, swap asset model & CDS Yield curves and Credit curves Financial assets designated at fair value through profit or loss 53,765 478 45,559 649 Central banks 4,881 — 9,481 — Present value method Yield curves, FX market prices Credit institutions 23,910 — 11,973 163 Present value method Yield curves, FX market prices Customers (****) 24,916 17 24,102 19 Present value method Yield curves, FX market prices, HPI Debt instruments 58 461 3 467 Present value method Yield curves, FX market prices Financial assets at fair value through other comprehensive income 22,014 5,976 22,962 6,220 Equity instruments 74 1,064 75 1,223 Present value method Market price, Interest rates curves, Dividends and Others Debt instruments 18,403 244 18,410 206 Present value method Yield curves, FX market prices Loans and receivables 3,537 4,668 4,477 4,791 Present value method Yield curves, FX market prices and Credit curves LIABILITIES 113,764 623 124,098 905 Financial liabilities held for trading 55,864 256 71,009 295 Derivatives 51,846 256 63,920 295 Swaps 42,360 57 51,584 81 Present value method, Gaussian Copula (***) Yield curves, FX market prices, Basis, Liquidity, HPI Exchange rate options 530 23 724 1 Black-Scholes Model Yield curves, Volatility surfaces, FX market prices, Liquidity Interest rate options 3,050 36 4,226 49 Black-Scholes Model, multifactorial advanced models interest rate Yield curves, Volatility surfaces, FX market prices, Liquidity Index and securities options 657 132 456 97 Black-Scholes Model Yield curves, FX market prices Interest rate and equity futures 242 — 1,054 2 Present value method Yield curves, Volatility surfaces, FX & EQ market prices, Dividends Other 5,007 8 5,876 65 Present value method, Advanced stochastic volatility models Yield curves, Volatility surfaces, FX & EQ market prices, Dividends, Correlation, Liquidity, HPI, Credit, Others Short positions 4,018 — 7,089 — Present value method Yield curves ,FX & EQ market prices, Equity Hedging derivatives 6,573 — 6,869 — Swaps 5,247 — 5,821 — Present value method Yield curves ,FX & EQ market prices, Basis Interest rate options 11 — 13 — Black's Model Yield curves , Volatility surfaces, FX market prices, Liquidity Other 1,315 — 1,035 — Present value method, Advanced stochastic volatility models and other Yield curves , Volatility surfaces, FX market prices, Credit, Liquidity, Other Financial liabilities designated at fair value through profit or loss 50,313 367 45,310 610 Present value method Yield curves, FX market prices Liabilities under insurance contracts 1,014 — 910 — Present Value Method with actuarial techniques Mortality tables and interest rate curves (*) The internal models of level 2 implement figures based on the parameters observed in the market, while Level 3 internal models uses significant inputs that are not observable in market data. (**) Includes mainly short-term loans and reverse repurchase agreements with corporate customers (mainly brokerage and investment companies). (***) Includes credit risk derivatives with a negative net fair value of EUR -3 an d EUR -4 million recognised in the interim condensed consolidated balance sheet 30 June 2021 and 31 December 2020. These assets and liabilities are measured using the Standard Gaussian Copula Model. (****) Includes residential mortgages to financial institutions in the United Kingdom (which are regulated and partly financed by the Government). The fair value of these loans has been obtained using observable market variables, including current market transactions of similar amount and guarantees provided by the UK Housing Association. Given that the Government is involved in these entities, credit risk spreads have remained stable and homogeneous in this sector. The results arising from the valuation model are contrasted against current market transactions. The measurements obtained using the internal models might have been different had other methods or assumptions been used with respect to interest rate risk, to credit risk, market risk and foreign currency risk spreads, or to their related correlations and volatilities. Nevertheless, Banco Santander’s directors consider that the fair value of the financial assets and liabilities recognised in the consolidated balance sheet and the gains and losses arising from these financial instruments are reasonable. Level 3 financial instruments Set forth below are Grupo Santander's main financial instruments measured using unobservable market data that constitute significant inputs of the internal models (level 3): - Instruments in Santander UK's portfolio (loans, debt instruments and derivatives) linked to the House Price Index (HPI). Even if the valuation techniques used for these instruments may be the same as those used to value similar products (present value in the case of loans and debt instruments, and the Black-Scholes model for derivatives), the main factors used in the valuation of these instruments are the HPI spot rate, the growth rate of that rate, its volatility and mortality rates, which are not always observable in the market and, accordingly, these instruments are considered illiquid: • The HPI spot rate: for some instruments the NSA HPI spot rate, which is directly observable and published on a monthly basis, is used. For other instruments where regional HPI rates must be used (published quarterly), adjustments are made to reflect the different composition of the rates and adapt them to the regional composition of Santander UK's portfolio. • HPI growth rate: this is not always directly observable in the market, especially for long maturities, and is estimated in accordance with existing quoted prices. To reflect the uncertainty implicit in these estimates, adjustments are made based on an analysis of the historical volatility of the HPI, incorporating reversion to the mean. • HPI volatility: the long-term volatility is not directly observable in the market but is estimated on the basis of more short-term quoted prices and by making an adjustment to reflect the existing uncertainty, based on the standard deviation of historical volatility over various time periods. • Mortality rates: these are based on published official tables and adjusted to reflect the composition of the customer portfolio for this type of product at Santander UK. - Callable interest rate trading derivatives (Bermudan style options) where the main unobservable input is mean reversion of interest rates. - Derivatives of negotiation on interest rates, taking asset securitisations and with the redemption rate (CPR) as the main unobservable input as an underlying asset. - Derivatives from trading on inflation in Spain, where volatility is not observable in the market. - Derivatives on long-term interest rate volatility and FX where volatility is not observable in the market at the indicated term. - Equity volatility derivatives, specifically indices and equities, where volatility is not observable in the long term. - Derivatives on long-term interest rate and FX in some Latam units (mainly Brazil), where for certain underlyings it is not possible to demonstrate observability to these terms. - Debt instruments in Latam units linked to certain illiquid interest rates, for which there is no reasonable market observability. - Illiquid equity in non-trading portfolios, classified at fair value through profit or loss and at fair value through equity. - Syndicated loans with the HTC&S business model (Hold to collect and sale) and classified in the fair value category with changes in other accumulated global result, is not directly observable in the market, as well as the prepayment option in favour of the borrower. The net amount recorded in the results of the first six months of 2021 resulting from the aforementioned valuation models which main inputs are unobservable market data (Level 3) amounts to EUR 11 million loss approximately (EUR 56 million profit in the first six months of 2020). The table below shows the effect, at 30 June 2021, on the fair value of the main financial instruments classified as Level 3 of a reasonable change in the assumptions used in the valuation. This effect was determined by applying the probable valuation ranges of the main unobservable inputs detailed in the following table: Portfolio/Instrument Valuation technique Main unobservable inputs Range Weighted average Impacts (EUR million) (Level 3) Unfavourable scenario Favourable scenario Held for trading (Assets) Derivatives Cap&Floor Volatility option model Volatility 10% - 90% 34.73% — — CCS Discounted Cash Flows Interest rate -0.7%-0.7% 0.66% (0.19) 0.19 CCS Forward estimation Interest rate 3bp - 4bp 0.83% (0.05) 0.06 Convertibility curve - inputs: NDFs Offshore Forward estimation Price 0% - 2% 0.61% (0.72) 0.31 EQ Options EQ option pricing model Volatility 0%- 90% 61.20% (0.32) 0.67 EQ Options Local volatility Volatility 10% - 90% 40.00% (2.11) 2.11 FRAs Asset Swap model Interest rate 0% - 4% 1.78% (0.83) 0.66 FX Options FX option pricing model Volatility 0% - 50% 32.14% (0.36) 0.65 Inflation Derivatives Asset Swap model Inflation Swap Rate -100%-50% 83.33% (0.68) 0.34 Inflation Derivatives Volatility option model Volatility 0% - 40% 13.29% (0.43) 0.22 IR Futures Asset Swap model Interest rate 0% - 15% 5.91% (0.99) 0.64 IR Options IR option pricing model Volatility 0% - 100% 60.47% (0.27) 0.41 IRS Asset Swap model Interest rate 0% - 15% 10.71% (0.06) 0.16 IRS Discounted Cash Flows Swap Rate 7.4% - 7.9% (2.64)% (0.16) 0.07 IRS Forward Estimation Prepayment rate 6% - 12% 9.00% — — IRS Prepayment modelling Prepayment rate 2.5% - 6.2% 0.50% (0.13) 0.07 IRS Others Others n.a. n.a. (1.40) 1.40 Property derivatives Option pricing model Growth rate 0% - 5% 2.50% (9.55) 9.55 Swaptions IR option pricing model Volatility 0% - 40% 26.67% (0.16) 0.31 At Fair Value through P&L Loans and advances to customers Mortgage portfolio Black Scholes model Growth rate 0% - 5% 2.50% (2.33) 2.33 Loans Discounted Cash Flows Credit spreads 0.1% - 1.4% 0.67% (0.26) 0.26 Debt securities Government debt Discounted Cash Flows Interest rate 0% - 10% 8.33% (5.92) 29.58 Property securities Probability weighting Growth rate 0% - 5% 2.50% (1.28) 1.28 Mandatorily Fair Value through P&L Loans and advances to customers Loans Discounted Cash Flows Margin of a reference portfolio -1bp-1bp 1bp (1.38) 3.09 Debt securities Corporate debt Discounted Cash Flows Margin of a reference portfolio -1bp-1bp 1bp (0.56) 0.60 Equity instruments Equities Price Based Price 90% - 110% 10.00% (105.26) 105.26 At Fair Value through OCI Loans and advances to customers Loans Discounted Cash Flows Credit spread n.a. n.a. (3.90) — Loans Discounted Cash Flows Interest rate curve -0.1%-0.1% 0.12% (0.14) 0.14 Portfolio/Instrument Valuation technique Main unobservable inputs Range Weighted average Impacts (EUR million) (Level 3) Unfavourable scenario Favourable scenario Loans Discounted Cash Flows Credit spreads 0.1% - 1.4% 0.67% (0.26) 0.26 Debt securities Government debt Discounted Cash Flows Interest rate 1.2% - 1.4% 0.10% — — Equity instruments Equities Price Based Price 90% - 110% 10.00% (106.40) 106.40 Held for trading (Liabilities) Derivatives Cap&Floor Volatility option model Volatility 10% - 90% 34.73% — — EQ Options Option pricing model Correlations (100)% - 100% 100.00% (0.04) 0.04 FX Options FX option pricing model Volatility 2Vegas - 13.4Vegas 12.26% — 0.01 Property derivatives Option pricing model Growth rate 0% - 5% 2.50% (2.80) 2.80 IRS Forward estimation Prepayment rate 6% - 12% 9.00% — — Lastly, the changes in the financial instruments classified as Level 3 in the first six months of 2021 were as follows: 01-01-2021 Changes 30-06-2021 EUR million Fair value calculated using internal models (Level 3) Purchases/Settlements Sales/Amortisation Changes in fair value recognized in profit or loss Changes in fair value recognised in equity Level reclassifications Other Fair value calculated using internal models (Level 3) Financial assets held for trading 740 67 (91) (51) — (59) 5 611 Debt instruments 7 17 (2) (3) — — — 19 Equity instruments 3 — (1) 1 — — — 3 Trading derivatives 730 50 (88) (49) — (59) 5 589 Swaps 272 5 (12) (29) — (1) (2) 233 Exchange rate options 22 14 (27) 24 — — — 33 Interest rate options 241 7 (39) (24) — — — 185 Index and securities options 94 11 (4) 20 — (59) 4 66 Other 101 13 (6) (40) — 1 3 72 Trading financial assets at fair value through profit or loss 649 53 (127) 35 — (163) 31 478 Credit institutions 163 — — — — (163) — — Loans and advances to customers 19 — (2) — — — — 17 Debt instruments 467 53 (125) 35 — — 31 461 Non-trading financial assets mandatorily at fair value through profit or loss 934 97 (114) 7 — 515 30 1,469 Loans and advances to customers 295 56 (71) (18) — — 4 266 Debt instruments 134 — (11) 6 — 12 9 150 Equity instruments 505 41 (32) 19 — 503 17 1,053 Financial assets at fair value through other comprehensive income 6,220 2,941 (2,825) — (127) (260) 27 5,976 Loans and advances to customers 4,792 2,865 (2,782) — (18) (192) 3 4,668 Debt instruments 206 74 (25) — 40 (68) 17 244 Equity instruments 1,222 2 (18) — (149) — 7 1,064 TOTAL ASSETS 8,543 3,158 (3,157) (9) (127) 33 93 8,534 Financial liabilities held for trading 295 27 (27) (23) — (25) 9 256 Trading derivatives 295 27 (27) (23) — (25) 9 256 Swaps 81 3 (3) (19) — (4) (1) 57 Exchange rate options 1 — — 21 — — 1 23 Interest rate options 49 6 (13) (6) — — — 36 Index and securities options 97 16 (4) 34 — (21) 10 132 Interest rate and equity futures 2 — (2) — — — — — Others 65 2 (5) (53) — — (1) 8 Financial liabilities designated at fair value through profit or loss 610 — — 25 — (289) 21 367 TOTAL LIABILITIES 905 27 (27) 2 — (314) 30 623 The detail at 30 June 2021 and 31 December 2020, by type of financial instrument, of Grupo Santander credit institutions’ sovereign risk exposure to Europe’s peripheral countries and of the short positions exposed to them, taking into consideration the scope established by the European Banking Authority (EBA) in the analyses performed on the capital needs of European credit institutions (See Note 50 to the consolidated annual accounts for 2020), is as follows: Sovereign risk by country of issuer/borrower at 30 June 2021 (*) EUR million Debt instruments MtM Derivatives (***) Financial assets held for trading and Financial assets designated at fair value through profit or loss Short positions Financial assets at fair value through other comprehensive income Non-trading financial assets mandatorily at fair value through profit or loss Financial assets at amortised cost Loans and advances to customers (**) Total net direct exposure Other than CDSs CDSs Spain 7,427 (5,146) 2,928 — 1,010 13,022 19,241 326 — Portugal 243 (205) 2,299 — 547 4,231 7,115 — — Italy 1,765 (1,171) 3,882 — 51 17 4,544 1 (1) Ireland — — — — — — — — — (*) I nformation prepared under EBA standards. Also, there are government debt instruments on insurance companies balance sheets amounting to EUR 13,450 million (of which EUR 11,804 million, EUR 1,164 million, EUR 470 million and EUR 12 million relate to Spain, Portugal, Italy and Ireland, respectively) and off-balance-sheet exposure other than derivatives – contingent liabilities and commitments – amounting to EUR 4,989 million (of which EUR 4,649 million, EUR 286 million and EUR 54 million to Spain, Portugal and Italy, respectively). (**) Presented without taking into account the valuation adjustments recognised (EUR 17 million). (***) "Other than CDSs" refers to the exposure to derivatives based on the location of the counterparty, irrespective of the location of the underlying. “CDSs” refers to the exposure to CDSs based on the location of the underlying. Sovereign risk by country of issuer/borrower at 31 December 2020 (*) EUR million Debt instruments MtM Derivatives (***) Financial assets held for trading and Financial assets designated at fair value through profit or loss Short positions Financial assets at fair value through other comprehensive income Non-trading financial assets mandatorily at fair value through profit or loss Financial assets at amortised cost Loans and advances to customers (**) Total net direct exposure Other than CDSs CDSs Spain 9,765 (5,665) 7,048 — 993 12,104 24,245 546 — Portugal 202 (582) 4,148 — 631 4,331 8,730 — — Italy 556 (307) 2,468 — 1,277 21 4,015 1 (1) Ireland — — — — — — — — — (*) Information prepared under EBA standards. Also, there are government debt instruments on insurance companies balance sheets amounting to EUR 14,241 million (of which EUR 12,571 million, EUR 1,281 million, EUR 387 million and EUR 2 million relate to Spain, Portugal, Italy and Ireland, respectively) and off-balance-sheet exposure different to derivatives – contingent liabilities and commitments – amounting to EUR 6,134 million (EUR 5,509 million, EUR 345 million and EUR 280 million to Spain, Portugal and Italy, respectively). (**) Presented without taking into account the valuation adjustments recognised (EUR 23 million). (***)"Other than CDSs" refers to the exposure to derivatives based on the location of the counterparty, irrespective of the location of the underlying. “CDSs” refers to the exposure to CDSs based on the location of the underlying. The detail of Grupo Santander’s other exposure to other counterparties (private sector, central banks and other public entities that are not considered to be sovereign risks) in the aforementioned countries at 30 June 2021 and 31 December 2020 is as follows: Exposure to other counterparties by country of issuer/borrower at 30 June 2021 (*) EUR million Debt instruments Derivatives (***) Balances with central banks Reverse repurchase agreements Financial assets held for trading and Financial assets designated at FVTPL Financial assets at fair value through other comprehensive income Non-trading financial assets mandatorily at fair value through profit or loss Financial assets at amortised cost Loans and advances to customers (**) Total net direct exposure Other than CDSs CDSs Spain 68,708 3,574 456 903 82 490 202,824 277,037 1,213 (2) Portugal 6,922 0 187 29 — 2,955 35,647 45,740 520 — Italy 321 7,340 342 553 — 147 14,794 23,497 510 (4) Greece — — — — — — 18 18 — — Ireland — 176 68 2,756 591 734 11,556 15,881 127 — (*) Also, Grupo Santander has off-balance-sheet exposure other than derivatives -contingent liabilities and commitments- amounting to EUR 77,418 million, EUR 8,392 million, EUR 6,318 million and EUR 975 million to counterparties in Spain, Portugal, Italy and Ireland, respectively. (**) Presented without taking into account valuation adjustments or impairment corrections (EUR 8,084 million). (***)“Other than CDSs” refers to the exposure to derivatives based on the location of the counterparty, irrespective of the location of the underlying. “CDSs” refers to the exposure to CDSs based on the location of the underlying. Exposure to other counterparties by country of issuer/borrower at 31 December 2020 (*) EUR million Debt instruments Derivatives (***) Balances with central banks Reverse repurchase agreements Financial assets held for trading and Financial assets designated at FVTPL Financial assets at fair value through other comprehensive income Non-trading financial assets mandatorily at fair value through profit or loss Financial assets at amortised cost Loans and advances to customers (**) Total net direct exposure Other than CDSs CDSs Spain 62,023 3,837 619 943 2 24 203,226 270,674 2,581 (4) Portugal 3,937 — 140 22 — 2,933 34,935 41,967 685 — Italy 10 7,098 425 493 — 129 13,437 21,592 1,001 (4) Greece — — — — — — 14 14 — — Ireland — — 22 2,337 556 9 10,523 13,447 153 — (*) Also, Grupo Santander has off-balance-sheet exposure other than derivatives - contingent liabilities and commitments- amounting to EUR 76,377 million, EUR 8,591 million, EUR 4,173 million, EUR 200 million and EUR 797 million to counterparties in Spain, Portugal, Italy, Greece and Ireland, respectively. (**) They are presented without taking into account valuation adjustments or impairment corrections (EUR 8,129 million). (***)“Other than CDSs” refers to the exposure to derivatives based on the location of the counterparty, irrespective of the location of the underlying. “CDSs” refers to the exposure to CDSs based on the location of the underlying. Following is certain information on the notional amounts of the CDSs detailed in the foregoing tables at 30 June 2021 and 31 December 2020: 30-06-2021 EUR million Notional amount Fair value Bought Sold Net Bought Sold Net Spain Sovereign — — — — — — Other 611 315 296 (14) 12 (2) Portugal Sovereign — — — — — — Other 52 — 52 — — — Italy Sovereign 327 205 122 (2) 1 (1) Other 220 110 110 (5) 1 (4) Greece Sovereign — — — — — — Other — — — — — — Ireland Sovereign — — — — — — Other — 6 (6) — — — 31-12-2020 EUR million Notional amount Fair value Bought Sold Net Bought Sold Net Spain Sovereign — — — — — — Other 546 273 273 (13) 9 (4) Portugal Sovereign — — — — — — Other 52 — 52 — — — Italy Sovereign 326 206 120 (3) 2 (1) Other 220 11 209 (4) — (4) c) Refinancing and restructured transactions The following terms are used with the meanings specified below: • Refinancing transaction: transaction that is granted or used, for reasons relating to current or foreseeable financial difficulties of the borrower, to repay one or more of the transactions granted to it, or through which the payments on such transactions are brought fully or partially up to date, in order to enable the borrowers of the cancelled or refinanced transactions to repay their debt (principal and interest) because they are unable, or might foreseeably become unable, to comply with the conditions thereof in due time and form. • Restructured transaction: transaction with respect to which, for economic or legal reasons relating to current or foreseeable financial difficulties of the borrower, the financial terms and conditions are modified in order to facilitate the payment of the debt (principal and interest) because the borrower is unable, or might foreseeably become unable, to comply with the aforementioned terms and conditions in due time and form, even if such modification is envisaged in the agreement. For maximum guarantees amount, we will consider as follows: • Real guarantees: the appraisal amount or valuation amount of the real guarantees received; for each transaction it cannot be higher than the covered amount of exposure. 30-06-2021 Total Of which: Impaired Without real guarantee With real guarantee Without real guarantee With real guarantee Maximum amount of the actual collateral that can be considered Maximum amount of the actual collateral that can be considered Amounts in million euros, except number of transactions in units Number of transactions Gross amount Number of operations Gross amount Mortgage guarantee Other guarantees Impairment of accumulated value or accumulated losses in fair value due to credit risk Number of transactions Gross amount Number of operations Gross amount Mortgage guarantee Other guarantees Impairment of accumulated value or accumulated losses in fair value due to credit risk Credit entities — — — — — — — — — — — — — — Public sector 27 20 17 6 4 — 1 7 1 11 2 2 — 1 Other financial institutions and: individual shareholder 797 37 599 211 100 87 27 325 18 393 72 57 11 24 Non financial institutions and individual shareholder 221,539 10,579 49,625 10,036 6,320 1,217 4,668 100,297 3,737 34,456 6,367 3,997 425 4,188 Of which: Financing for constructions and property development 7,543 133 1,276 621 408 35 222 3,901 45 811 411 218 31 201 Other warehouses 2,902,894 4,397 433,415 10,825 6,335 2,925 3,668 1,420,116 1,825 135,971 3,812 2,703 311 2,263 Total 3,125,257 15,033 483,656 21,078 12,759 4,229 8,364 1,520,745 5,581 170,831 10,253 6,759 747 6,476 Financing classified as non-current assets and disposable groups of items that have been classified as held for sale — — — — — — — — — — — — — — The table below shows the changes of these balances during the first six months of 2021: Million euros Carrying amount 30-06-2021 Beginning balances 20,997 Refinancing and restructuring of the period 10,543 Memorandum items: impact recorded in the income statement for the period 1,078 Debt repayment (2,659) Foreclosures (161) Derecognised from the consolidated balance sheet (537) Other variations (436) Balances at end of year 27,747 d) Real estate business – Spain i) Portfolio of home purchase loans to families Home purchase loans granted to families in Spain on 30 June 2021 amounted to EUR 60,462 million (EUR 59,605 million at 31 December 2020). Of which mortgage guarantees are 99.35%. Million euros 30-06-2021 31-12-2020 Gross Amount Of which: Impaired Gross Amount Of which: Impaired Home purchase loans to families 60,462 1,827 59,605 1,850 - Without mortgage guarantee 396 82 387 75 - With mortgage guarantee 60,066 1,745 59,218 1,775 The risk profile of the home purchase mortgage loan portfolio in Spain remained at a medium-low level, with limited prospects of additional impairment: • Principal is repaid on all mor tgages from the start. • Early repayment is common so the average life of the transaction is well below that of the contract. • High quality of collateral concentrated almost exclusively in financing the first home. • Average affordability rate at the end of June stood at 26.38% . • 87.49% of the portfolio has a LTV below 80%, calculated a s total risk/latest available house appraisal. 30-06-2021 Gross amount in books on the amount of the last appraisal (loan to value) Million euros Less than or equal to 40% More than 40% or less than 60% More than 60% and less than 80% More than 80% and less or equal to 100% More than 100% TOTAL Gross amount 15,759 18,383 18,408 4,920 2,596 60,066 Of which: watchlist /impaired 170 218 304 307 746 1,745 31-12-2020 Gross amount in books on the amount of the last appraisal (loan to value) Million euros Less than or equal to 40% More t

Additional disclosure requireme

Additional disclosure requirements	6 Months Ended
	Jun. 30, 2021
Parent Company Financial Statements And Preference Shares And Preferred Securities [Abstract]
Additional disclosure requirements	Additional disclosure requirements This note includes relevant information about additional disclosure requirements. 17.1 Parent company financial statements Following are the summarised balance sheets of Banco Santander, S.A. as of 30 June 2021 and 31 December 2020. In the financial information of the Parent, investments in subsidiaries, jointly controlled entities and associates are recorded at cost. UNAUDITED CONDENSED BALANCE SHEETS 30 June 2021 31 December 2020 (Parent company only) (Millions of Euros) Assets Cash and due from banks 136,068 112,114 Of which: To bank subsidiaries 15,354 14,519 Trading account assets 75,734 81,433 Investment securities 39,518 29,477 Of which: To bank subsidiaries 7,697 13,603 To non-bank subsidiaries 13,242 3,399 Net Loans and leases 303,950 295,739 Of which: To non-bank subsidiaries 27,670 27,555 Investment in affiliated companies 86,631 84,890 Of which: To bank subsidiaries 66,035 60,186 To non-bank subsidiaries 20,596 24,703 Premises and equipment, net 6,469 6,680 Other assets 16,439 19,036 Total assets 664,809 629,369 Liabilities Deposits 404,072 383,135 Of which: To bank subsidiaries 17,378 17,045 To non-bank subsidiaries 31,649 19,949 Short-term debt 32,544 14,513 Long-term debt 86,560 83,981 Total debt 119,104 98,494 Of which: To bank subsidiaries 634 617 To non-bank subsidiaries 688 661 Other liabilities 76,873 82,803 Total liabilities 600,049 564,432 Stockholders' equity Capital stock 8,670 8,670 Retained earnings and other reserves 56,090 56,267 Total stockholders' equity 64,760 64,937 Total liabilities and Stockholders’ Equity 664,809 629,369 Following are the summarised unaudited statements of income of Banco Santander, S.A. for the periods ended 30 June 2021 and 2020. UNAUDITED CONDENSED STATEMENTS OF INCOME Six months ended Six months ended (Parent company only) 30 June 2021 30 June 2020 (Millions of Euros) Interest income Interest from earning assets 3,473 3,628 Dividends from affiliated companies 1,139 654 Of which: From bank subsidiaries 886 407 From non-bank subsidiaries 253 247 4,612 4,282 Interest expense (1,369) (1,763) Interest income / (Charges) 3,243 2,519 Provision for credit losses (916) (1,070) Interest income / (Charges) after provision for credit losses 2,327 1,449 Non-interest income: 2,134 2,058 Non-interest expense: (3,411) (8,571) Income before income taxes 1,050 (5,064) Income tax expense (147) (1,747) Net income 903 (6,811) Following are the summarised unaudited statements of comprehensive income of Banco Santander, S.A. for the periods ended 30 June 2021 and 2020. UNAUDITED CONDENSED STATEMENTS OF Six months ended Six months ended COMPREHENSIVE INCOME (Parent company only) 30 June 2021 30 June 2020 (Millions of Euros) NET INCOME 903 (6,811) OTHER COMPREHENSIVE INCOME (380) (829) Items that may be reclassified subsequently to profit or loss (115) (210) Hedging instruments (items not designated) — — Revaluation gains (losses) — — Amounts transferred to income statement — — Other reclassifications — — Debt instruments at fair value with changes in other comprehensive income (333) (199) Revaluation gains (losses) (192) 95 Amounts transferred to income statement (141) (294) Other reclassifications — — Cash flow hedges: 168 (104) Revaluation gains/(losses) 172 (126) Amounts transferred to income statement (4) 22 Amounts transferred to initial carrying amount of hedged items — — Other reclassifications — — Hedges of net investments in foreign operations: — — Exchange differences — — Non-current assets held for sale — — Income tax 50 93 Items that will not be reclassified to profit or loss: (265) (619) Actuarial gains/(losses) on pension plans 45 (42) Other recognised income and expense of investments in subsidiaries, joint ventures and associates — — Changes in the fair value of equity instruments measured at fair value through other comprehensive income (209) (688) Gains or losses resulting from the accounting for hedges of equity instruments measured at fair value through other comprehensive income, net — — Changes in the fair value of equity instruments measured at fair value through other comprehensive income (hedged item) 54 12 Changes in the fair value of equity instruments measured at fair value through other comprehensive income (hedging instrument) (54) (12) Changes in the fair value of financial liabilities at fair value through profit or loss attributable to changes in credit risk (116) 5 Income tax relating to items that will not be reclassified 15 106 TOTAL COMPREHENSIVE INCOME 523 (7,640) Following are the summarised unaudited cash flow statements of Banco Santander, S.A. for the periods ended 30 June 2021 and 2020. UNAUDITED CONDENSED CASH FLOW STATEMENTS Six months ended Six months ended (Parent company only) 30 June 2021 30 June 2020 (Millions of Euros) 1. Cash flows from operating activities Consolidated profit 903 (6,811) Adjustments to profit 546 11,830 Net increase/decrease in operating assets (26,844) (63,984) Net increase/decrease in operating liabilities 33,777 83,119 Reimbursements/payments of income tax 349 942 Total net cash flows from operating activities (1) 8,731 25,096 2. Cash flows from investing activities Investments (-) (946) (1,874) Divestments (+) 3,597 497 Total net cash flows from investment activities (2) 2,651 (1,377) 3. Cash flows from financing activities Issuance of own equity instruments — — Disposal of own equity instruments 316 327 Acquisition of own equity instruments (316) (327) Issuance of debt securities 1,578 1,500 Redemption of debt securities (426) (1,914) Dividends paid (477) — Issuance/Redemption of equity instruments — — Other collections/payments related to financing activities (100) (162) Total net cash flows from financing activities (3) 575 (576) 4. Effect of exchange rate changes on cash and cash equivalents (4) 180 (253) 5. Net increase/decrease in cash and cash equivalents (1+2+3+4) 12,137 22,890 Cash and cash equivalents at beginning of period 67,561 32,471 Cash and cash equivalents at end of period 79,698 55,361 17.2 Preference Shares and Preferred Securities The following table shows the balance of the preference shares and preferred securities as of 30 June 2021 and 31 December 2020: 30 June 2021 31 December 2020 (Millions of Euros) Preference shares 205 196 Preferred securities 9,036 7,425 Total at period-end 9,241 7,621 Both preference shares and preferred securities are recorded under the “Financial liabilities at amortized cost – Subordinated Liabilities” caption in the consolidated balance sheet as of 30 June 2021 and 31 December 2020. Preference shares include the financial instruments issued by the consolidated companies which, although equity for legal purposes, do not meet the requirements for classification as equity in the financial statements. These shares do not carry any voting rights and are non-cumulative. Preference shares include non-cumulative preferred non-voting shares issued by Santander UK plc. Preferred securities include non-cumulative preferred non-voting securities issued by Banco Santander, S.A. For the purposes of payment priority, preferred securities are junior to all general creditors and to subordinated deposits. The payment of dividends on these securities, which have no voting rights, is conditional upon obtaining sufficient distributable profit and upon the limits imposed by Spanish banking regulations on equity. Preference shares and preferred securities are perpetual securities and there is no obligation that requires the Group to redeem them. All securities have been fully subscribed by third parties outside the Group. In the consolidated balance sheets, these securities are shown net of any temporary transactions relating to liquidity guarantees. For further information, see note 23.c. to our consolidated financial statements in Section 2 of our 6-K filed with the SEC on 14 April 2021 and Note 9.b. to our consolidated financial statements in Part 2 of this report. Outstanding at 30 June 2021 Amount in Preference Shares currency Interest rate Redemption Issuer/Date of issue Currency (million) Option (A) Santander UK plc, October 1995 Pounds Sterling 80.3 10.375 % No option Santander UK plc, February 1996 Pounds Sterling 80.3 10.375 % No option Outstanding at 30 June 2021 Amount in Preferred Securities currency Interest rate Maturity date Issuer/Date of issue Currency (million) Banco Santander, S.A. Banco Santander, S.A., September 2014 Euro 1,500.0 6.25 % (B) Perpetuity Banco Santander, S.A., April 2017 Euro 750.0 6.75 % (C) Perpetuity Banco Santander, S.A., September 2017 Euro 1,000.0 5.25 % (D) Perpetuity Banco Santander, S.A., March 2018 Euro 1,500.0 4.75 % (E) Perpetuity Banco Santander, S.A., February 2019 US Dollar 1,200.0 7.50 % (F) Perpetuity Banco Santander, S.A., January 2020 Euro 1,500.0 4.375 % (G) Perpetuity Banco Santander, S.A., May 2021 US Dollar 1,000.0 4.75 % (H) Perpetuity Banco Santander, S.A., May 2021 Euro 750.0 4.125 % (I) Perpetuity Santander Finance Preferred, S.A. (Unipersonal), September 2004 Euro 144.0 €CMS 10 +0.05% subject to a maximum distribution of 8% per annum Perpetuity Santander Finance Preferred, S.A. (Unipersonal), July 2007 Pounds Sterling 4.9 7.01 % Perpetuity A. From these dates the issuer can redeem the shares, subject to prior authorization by the national supervisor. B. Payment is subject to certain conditions and to the discretion of Banco Santander. The 6.25% interest rate is set for the first seven years. After that, it will be reviewed by applying a margin of 564 basis points on the 5-year Mid-Swap Rate. C. Payment is subject to certain conditions and to the discretion of Banco Santander. The 6.75% interest rate is set for the first five years. After that, it will be reviewed by applying a margin of 680.3 basis points on the 5-year Mid-Swap Rate. D. Payment is subject to certain conditions and to the discretion of Banco Santander. The 5.25% interest rate is set for the first six years. After that, it will be reviewed by applying a margin of 499.9 basis points on the 5-year Mid-Swap Rate. E. Payment is subject to certain conditions and to the discretion of Banco Santander. The 4.75% interest rate is set for the first seven years. After that, it will be reviewed every 5 years applying a margin of 409.7 basis points on the 5-year Mid-Swap Rate. F. Payment is subject to certain conditions and to the discretion of Banco Santander. The 7.50% interest rate is set for the first seven years. After that, it will be reviewed every 5 years by applying a margin of 489.9 basis points on the 5-year Mid-Swap Rate. G. Payment is subject to certain conditions and to the discretion of Banco Santander. The 4.375% interest rate is set for the first six years. After that, it will be reviewed every 5 years by applying a margin of 453.4 basis points on the 5-year Mid-Swap Rate. H. Payment is subject to certain conditions and to the discretion of Banco Santander. The 4.750% interest rate is set for the first six years, revised every 5 years thereafter by applying a margin of 375.3 basis points over the 5-year UST rate (5-year UST). I. Payment is subject to certain conditions and to the discretion of Banco Santander. The 4.125% interest rate is set for the first seven years, revised every 5 years thereafter by applying a margin of 431.1 basis points over the applicable 5-year Euro mid-swap. Santander Finance Preferred, S.A. (Unipersonal) - issuer of registered securities guaranteed by Banco Santander, S.A. until November 2017, merged on that date with Banco Santander, S.A.

Introduction, basis of presen_2

Introduction, basis of presentation of the interim condensed consolidated financial statements and other information (Policies)	6 Months Ended
	Jun. 30, 2021
Disclosure of reclassifications or changes in presentation [abstract]
Basis of presentation of the interim financial statements	Basis of presentation of the interim financial statements Under Regulation (EC) n.º 1606/2002 of the European Parliament and of the Council of 19 July 2002 all companies governed by the law of an EU Member State and whose securities are admitted to trading on a regulated market of any Member State must prepare their consolidated financial statements for the years beginning on or after 1 January, 2005 in conformity with the International Financial Reporting Standards ('IFRS') previously adopted by the European Union ('EU-IFRS'). In order to adapt the accounting system of Spanish credit institutions with the principles and criteria established by the IFRS adopted by the European Union ('EU-IFRS'), the Bank of Spain published circular 4/2017, dated 27 November 2017, and subsequent changes, on Public and Confidential Financial Reporting Standards and Financial Statement Formats. The consolidated annual accounts for 2020 were approved at the board of directors meeting on 22 February 2021 in compliance with International Financial Reporting Standards as adopted by the European Union, taking into account Bank of Spain Circular 4/2017, and subsequent modifications, using the basis of consolidation, accounting policies and measurement bases described in Note 2 to the aforementioned consolidated annual accounts and, accordingly, they presented fairly Grupo Santander’s consolidated equity and consolidated financial position at 31 December 2020 and the consolidated results of its operations, and the consolidated cash flows in 2020. The aforementioned consolidated annual accounts, which are included in Grupo Santander’s Form 6-K filed with the U.S. Securities and Exchange Commission on 14 April 2021, and these interim financial statements are also in compliance with International Financial Reporting Standards as issued by the International Accounting Standards Board ('IFRS-IASB', and together with EU-IFRS, `IFRS`). These interim financial statements were prepared and are presented in accordance with International Accounting Standard (IAS 34), Interim Financial Reporting, for the preparation of interim condensed financial statements, in conformity with Article 12 of Royal Decree 1362/2007, and taking into account the requirements of Circular 3/2018, of 28 June, of the Spanish National Securities Market Commission ('CNMV'). The aforementioned interim financial statements were included in the half-year financial report for the first six months of 2021 to be presented by the Group in accordance with the Circular 3/2018. In accordance with IAS 34, the interim financial statements are intended only to provide an update on the content of the latest consolidated annual accounts authorised for issue, focusing on new activities, events and circumstances occurring during the first six months, and does not duplicate information previously reported in the latest consolidated annual accounts. Consequently, these interim financial statements do not include all the information that would be required for a complete set of consolidated annual accounts prepared in accordance with IFRS and, accordingly, for a proper comprehension of the information included in these interim financial statements, they should be read together with Grupo Santander’s consolidated annual accounts for the year ended 31 December 2020. Grupo Santander policies include presenting the interim financial statements for its use in the different markets using the Euro as its presentation currency. The amounts held in other currencies and the balances of entities whose functional currency is not the Euro, have been translated to the presentation currency in accordance with the criteria indicated in Note 2.a to the consolidated annual accounts for 2020. As indicated in that Note, for practical reasons, the balance sheet amount has been converted to the closing exchange rate, the equity to the historical type, and the income and expenses have been converted by applying the average exchange rate of the period; the application of such exchange rate or that corresponding to the date of each transaction does not lead to significant differences in the interim financial statements of Grupo Santander. The accounting policies and methods used in preparing these interim financial statements are the same as those applied in the consolidated annual accounts for 2020 taking into account the standards and interpretations that became applicable during the first six months of 2021, which are detailed below: - Amendment to IFRS 4 Insurance Contracts, which is aimed at extending the expiry date of the temporary exemption from applying IFRS 9 by two years (from 1 January 2021 to 1 January 2023) for entities whose activities are predominantly insurance-related. This achieves alignment with the effective date of IFRS 17 Insurance Contracts (1 January 2023). It applies from 1 January 2021. The aforementioned amendment to accounting standards and interpretations has not had a significant effect on Grupo Santander’s financial statements. All accounting policies and measurement bases with a material effect on the interim financial statements for 30 June 2021 were applied in their preparation. By the time of the preparation and authorisation of these interim financial statements, there was the following standard to be adopted by the European Union whose effective date of implementation by the IASB is 1 January 2021. – Amendment IFRS 16 Leases: as a result of the covid-19 pandemic, IFRS 16 is amended to allow the lessee to apply a practical expedient and not consider the rental concessions a lease modification whenever the following requirements are met: the revised consideration is the same or less than the consideration prior to the change, the affected payments are prior to 30 June 2021, and there are no substantial changes in the rest of the lease conditions. On 31 March 2021, the IASB published an additional amendment to extend the scope of the practical expedient to 30 June 2022. The entry into force of the aforementioned amendment to the accounting standard no significant effects on the Group's interim financial statements are expected. IBOR Reform Since 2015, central banks and regulators in several major jurisdictions have promoted the transition to suitable replacements for some existing IBOR (Interbank Offered Rates) benchmarks such as Euro Overnight Index Average (EONIA) and London Interbank Offered Rates (LIBORs). On 27 July 2017, the Chief Executive of the U.K. Financial Conduct Authority (the FCA), which regulates the LIBOR, announced that the FCA will no longer persuade or compel banks to submit rates for the calculation of the LIBOR benchmarks after 2021. Additionally, on 13 September 2018 the WG euro RFR recommended that the Euro Short Term Rate (€STR) shall replace EONIA. Since 2 October 2019, the date on which the €STR became available, EONIA changed its methodology to be calculated as the €STR plus a spread of 8.5 basis points. This change in EONIA’s methodology is intended to facilitate the market’s transition from EONIA to €STR, with the former expected to be discontinued by the 3 January 2022. On October 2020, the International Swaps and Derivatives Association (ISDA) launched the IBOR Fallbacks Protocol, which become effective on 25 January 2021, and provide derivatives market participants with new IBOR fallbacks for legacy and new derivatives contracts. Banco Santander S.A. and several subsidiaries have adhered to this protocol. On December 2020, the European Union Council endorsed new rules amending of the European Union Benchmark Regulation (BMR). The aim of the amendments to the Benchmark Regulation is to make sure that a statutory replacement benchmark can be established by the regulators by the time a systemically important benchmark is no longer in use, and thus protect financial stability on European Union markets. The new rules give the Commission the power to replace so-called 'critical benchmarks', which could affect the stability of financial markets in Europe, and other relevant benchmarks, if their termination would result in a significant disruption in the functioning of financial markets in the European Union. The Commission will also be able to replace third country benchmarks if their cessation would result in a significant disruption in the functioning of financial markets or pose a systemic risk for the financial system in the European Union. In March 2021, the FCA announced the final dates for the cessation of LIBORs: – 31 December 2021 will see the cessation of publication of USD LIBOR (1-week and 2-month terms), CHF LIBOR (all terms), GBP LIBOR (overnight, 1-week, 2-month and 12-month terms), JPY LIBOR (overnight, 1-week, 2-month, and 12-month terms) and EUR LIBOR (all terms). – On 31 December 2021 the calculation methodology for some LIBORs will be reformed and will become non-representative: GBP LIBOR (1 month, 3 months and 6 months), JPY LIBOR (1 month, 3 months and 6 months). – On 30 June 2021 the publication of USD LIBOR (overnight, 12-month and 12-month maturities) will cease and the calculation methodology for USD LIBOR (1-month, 3-month and 6-month maturities) will be reformed and become non-representative. Interest rate benchmarks have an extended footprint in a significant number of contracts that Santander Group is holding and are used in multiple processes. The most relevant interest rate benchmarks for Santander are EURIBOR, EONIA, USD-LIBOR, GBP-LIBOR, and CHF-LIBOR. Santander Group uses these benchmarks as the reference rate not only for derivatives, but also for loans, discounting products, deposits, collateral agreements and floating rate notes, among others. The main risks to which Santander is exposed arising from financial instruments because of the transition are: (i) legal risks arising from potential changes required to documentation for new and existing transactions; (ii) risk management, financial and accounting risks arising from market risk models and from valuation, hedging, discontinuation and recognition of financial instruments linked to benchmark rates; (iii) business risk of a decrease in revenues of products linked to indices that will be replaced; (iv) pricing risks arising from how changes to benchmark indices could impact pricing mechanisms on some instruments; (v) operational risks arising from the potential requirement to adapt IT systems, trade reporting infrastructure and operational processes; (vi) conduct risks arising from the potential impact of communication with customers and engagement during the transition period and (vii)litigation risks regarding our existing products and services, which could adversely impact our profitability. In order to monitor the risks and address the challenges of the transition, Santander launched the IBOR Transition Programme in 2019. This programme has a group wide scope and reports on a regular basis to Executive Management involving statutory committees. Its main objective is to ensure a smooth operational transition and to anticipate and address any potential customer and conduct related issues that could arise from the IBOR transition. It also aims to ensure that all impacted areas, business units and geographies understand the risks associated with the transition in a homogeneous way and can take appropriate measures to mitigate them. This IBOR Transition Programme is aligned with the recommendations, guidance and milestones defined by regulators and working groups of different jurisdictions and is structured around the following areas: Technology & Operations, Legal, Client Outreach, Risk Management & Models, Conduct & Communications and Accounting & Finance. Additionally, Grupo Santander is engaged with the public and private sector initiatives in connection with IBOR transition. As part of this involvement, Santander participates in the WG Risk Free Rate Groups of different jurisdictions in Europe and America. Santander provides active feedback on the multiple consultations issued by industry forums, market associations, bank associations and other public organisms on this issue.
Use of critical estimates	Use of critical estimates The consolidated results and the determination of the consolidated equity are sensitive to the accounting principles and policies, valuation criteria and estimates used by the directors of Banco Santander in preparing the interim financial statements. The main accounting principles, policies, and valuation criteria are indicated in Note 2 of the consolidated annual accounts of the year 2020, except for those indicated in these interim financial statements due to the rules that have come into effect during the first six months of the year 2021. The interim financial statements contain estimates made by the senior management of Banco Santander and of the consolidated entities in order to quantify certain of the assets, liabilities, income, expenses and obligations reported in the consolidated entities. These estimates, which were made on the basis of the best information available, relate mainly to the following: 1. The income tax expense, which, in accordance with IAS 34, is recognised in interim periods based on the best estimate of the weighted average tax rate expected by Grupo Santander for the full financial year; 2. The impairment losses on certain assets – Financial assets at fair value through other comprehensive income, financial assets at amortised cost, non-current assets held for sale, investments in subsidiaries, joint ventures and associates, tangible assets and intangible assets; 3. The assumptions used in the calculation of the post-employment benefit liabilities and commitments and other obligations; 4. The useful life of the tangible and intangible assets; 5. The measurement of goodwill impairment arising on consolidation; 6. The calculation of provisions and the consideration of contingent liabilities; 7. The fair value of certain unquoted assets and liabilities; 8. The recoverability of deferred tax assets; and 9. The fair value of the identifiable assets acquired and the liabilities assumed in business combinations in accordance with IFRS 3. In order to update the estimates described above, Grupo Santander's management took into account the current situation as a result of covid-19, which significantly affects economic activity worldwide and, consequently, Grupo Santander's operations and financial results, as well as generating uncertainty in the estimates made. As a result, Group management has made an assessment of the current situation based on the best information available to date, identifying potential impacts of covid-19 on the main estimates made since the start of the pandemic, as well as for the first half of 2021. For estimates that have not changed during the first six months of this year, details are provided in Note 1.c of the consolidated financial statements for 2020. From the results of this evaluation, the following aspects stand out: – Credit risk: i. Covid-19 management and customer support: Since the start of the covid-19 health crisis last year, Grupo Santander's priority has been to look after the health of its employees, customers and shareholders, as well as helping to alleviate the economic impact of the pandemic and offering the best solutions to help our customers. The various measures implemented to manage the effects of the pandemic can be grouped into the following areas: • Identification and classification of clients or groups affected or potentially affected by the pandemic. • Granting of support measures under both government and internal programmes and close monitoring of the evolution of the customers subject to them, especially after their maturity, to ensure that their potential impairment is correctly reflected in the Group's risk management. • Remedial management activities where necessary. • Adaptation and reinforcement of our policies, models and processes relating to the estimation of expected losses and the classification of customers and transactions in order to ensure adequate risk management and hedging under the new environment. • Improvement and adaptation of reporting, incorporating new metrics and indicators such as those relating to the evolution of the pandemic or the volume and behaviour of moratoria, thus increasing the predictive capacity in relation to the evolution of the Group's risk profile. Grupo Santander continued to support its customers in the first half of 2021, fostering their economic resilience in all the Group's geographies. Regarding the moratorium measures granted, the amount at 30 June 2021 was around EUR 104,300 million. Of these, around 66% corresponded to residential mortgages, mainly in the UK where the portfolio has a low average loan to value (LTV) (<50%). The moratoriums granted in consumer lending operations (around EUR 16,400 million, or 16% of the total portfolio) are mainly car loans. The granting of new moratoriums slowed down from the second half of 2020 onwards. 92% of the total moratoriums (about EUR 96,000 million) have already matured by the end of June 2021, showing a good performance, with 5% of them being classified as stage 3 in accordance with IFRS 9. Loans subject to moratorium and not overdue amounted to EUR 8,700 million (mainly in Spain and Portugal), with about EUR 7,500 million maturing at the end of the third quarter. The continuous interaction and coordination with subsidiaries has been a key asset in the management of this crisis. The experience gained in the fight against the health crisis and its financial consequences in the different geographies has allowed us to share the best practices identified and to implement in an agile and efficient manner those strategies and specific actions that have been most successful, adapted to the local reality of each market. ii. Estimation of expected loss: The quantification of additional expected losses of the different credit portfolios was carried out by analysing the losses under IFRS 9 in accordance with the recommendations of the different accounting, regulatory and supervisory bodies. These highlighted the uncertainties surrounding the economic impacts of the covid-19 health crisis, which was also evident in the frequent updates of macroeconomic forecasts, with different perspectives as to the depth and duration of the crisis. Thus, the general recommendation (including IASB, ESMA, EBA and ECB) was not to mechanistically apply the usual techniques for calculating expected losses under IFRS 9, to prevent this variability of the fact that the impact on macroeconomic expectations would result in undesired volatility in outcomes, with its potential pro-cyclical effects on the economy. When estimating the expected loss, Grupo Santander analyses losses under IFRS 9 taking into account 3 types of elements: 1. Continuous monitoring of clients: • We continue to monitor and provide solutions to those Group customers whose moratoriums have expired, facilitating the restructuring of their debt for those customers with loans subject to government guarantee programmes that so require. Strict classification and loss recognition criteria are always applied in accordance with our internal rules, current regulations and supervisory recommendations. • Progress continued to be made in the processes of assessing and classifying our customers at the individual and sectoral level, following the various collective analyses carried out during the year. To this end, the behaviour of customers and the collective analyses carried out are continuously monitored, identifying and classifying on an individual basis those customers showing signs of impairment. As some of the uncertainties generated by the pandemic are cleared up, there will be a progressive move away from collective analyses towards a more individualised identification of deterioration. 2. Foresight • In this regard, when estimating the impact of macroeconomic information on the calculation of provisions under IFRS 9, the Group has continued to use macroeconomic scenarios based on the structural deterioration of the economy, following the guidance of supervisors and regulators in terms of a long-run view in the generation of scenarios. This structural view is generated through a more stable long-term outlook, reflecting the structural deterioration caused by the pandemic. For this purpose, for each geography, the point at which the macro, as represented by GDP and other relevant variants, recovers its potential growth trend is analysed, taking into account seasonal factors applicable to each economy. 3. Additional elements • Whenever they are necessary because they have not been captured under the two previous elements, they include, among others, the collective analysis including review of the sectors most affected by the pandemic, whenever their impacts have not been sufficiently captured by the macroeconomic scenarios. Also collective impairment assessment, whenever the potential deterioration in a group of customers cannot be identified individually. With the elements indicated above, the Group assesses the evolution of the credit quality of its customers in each of the geographical areas, for the purposes of their classification in phases in accordance with IFRS9 and consequently the calculation of the expected loss. iii. Quantification of additional provisions by covid-19: Numerous international authorities and supervisors noted the importance of cautiously adapting and applying accounting and prudential policies to the containment measures put in place to deal with the effects of the covid-19 health crisis. Considering these guidelines, Grupo Santander accounted for potential expected losses based on long-term stable macroeconomic forecasts, once the structural deterioration of the economy has materialised, through a subsequent overlay of the model, complemented by a collective and/or individual assessment in order to reflect a more accurate situation, specifically to recognise expected credit losses on assets that may have suffered a significant increase in credit risk (SCIR). In the case of collective assessment, without the need to identify which individual financial instruments suffered such SCIR. Such an overlay was considered the best option to recognise the increase in expected loss, as a mechanical application of the expected credit loss (ECL) methodology in the current context could have led to undesired volatility or unexpected results due to the lack of reliable information. Therefore, the additional provisions associated with different macroeconomic scenarios have been calculated using internal models; however, the above-mentioned overlay to the monthly IFRS 9 calculation has been considered to improve the control and monitoring of the accuracy of the expected credit loss estimation. The Group monitors the macroeconomic evolution in each of the geographies where it is present, and the adequacy of the provisions set up as indicated in the previous sections to the observed and expected impairment of its portfolios. As the relationship between the macroeconomic evolution, the models and the resulting provisions normalizes, the different units of the Group will progressively return in the coming quarters to the application of the IFRS 9 calculation processes in place prior to the outbreak of the pandemic. – Market risk: The evolution of financial markets during the first semester of 2021 has maintained the trend of previous quarters, with a normalisation of conditions after the tensions experienced during the first half of 2020. No significant increases in volatility, reductions in liquidity or reduced access to price sources and real market transactions for an appropriate valuation of our portfolios have been observed in the main risk factors present in our portfolios. Nor have we seen greater dispersion among the various price contributors and credit spreads have maintained their downward trend in a macroeconomic environment confident of economic recovery after the crisis of the last year. As a result, there has been no significant impact on the fair value hierarchy and most markets, underlying and maturities have maintained their classification, in line with our observability and significance criteria. Reclassifications between levels have been concentrated and not significant on specific positions for which there may have been a change in observability conditions or a change in access to reliable valuation sources. Nevertheless, the evolution of the markets, their liquidity and the observability conditions of the valuation inputs continue to be rigorously and exhaustively monitored in order to apply the criteria established in Grupo Santander for the classification of assets and liabilities measured at fair value and to anticipate any possible changes in current market conditions. The levels of risk measured in terms of VaR in all the Grupo Santander's units are at historically low levels. During the first semester of the year, positions in the portfolio remained low, with low use of the authorised risk limits. Grupo Santander's treasury activity continued to be concentrated in low complexity instruments and focused on providing services to our corporate clients, mainly in interest rate and FX risk factors. Although in the time window used to calculate VaR levels the high volatility scenarios observed last year due to the covid-19 crisis are maintained, exposure to risk is at historical lows of the last few years, approximately EUR 8.7 million (VaR 1d 99%) at the end of the semester . – Tax matters: In Spain, in June the tax assessments for corporate income tax financial years 2012-2015 were partially signed in disagreement. Banco Santander, S.A., as the parent of the Consolidated Tax Group, considers that these assessments should not have a significant impact on the consolidated financial statements or on capital, as there are sound defensive arguments in the appeals that will be filed. During the six-month period ended 30 June 2021, there have been no additional significant changes in the estimates made at the end of 2020, other than those indicated in this interim financial information.
Contingent assets and liabilities	Contingent assets and liabilitiesNote 2.o to Grupo Santander's consolidated annual accounts for the year ended 31 December 2020 includes information on the contingent assets and liabilities at that date. There were no significant changes in Grupo Santander's contingent assets and liabilities from 31 December 2020 to the date of formal preparation of these interim financial statements

Shareholder remuneration syst_2

Shareholder remuneration system and earnings per share (Tables)	6 Months Ended
	Jun. 30, 2021
Shareholder remuneration system and earnings per share
Schedule of shareholder remuneration	The cash remuneration paid by Banco Santander to its shareholders in the first six months of 2021 and 2020 was as follows: 30-06-2021 30-06-2020 % of par value Euros per share Amount (EUR million) % of par value Euros per share Amount (EUR million) Ordinary shares 5.50 % 0.0275 477 — — — Other shares (without vote, redeemable, etc.) — — — — — — Total remuneration paid 5.50 % 0.0275 477 — — — Dividend paid out of profit — — — — — — Dividend paid with a charge to reserves or share premium 5.50 % 0.0275 477 — — — Dividend in kind — — — — — — Flexible payment — — — — — — In May 2021, the Bank paid a dividend of 2.75 euro cents per share in cash for the 2020 financial year against share premium of EUR 477 million (see ECPN and Note 11), which is the maximum amount allowed under the limit set by the European Central Bank's recommendation of 15 December 2020. This payment was made in execution of the premium distribution resolution approved at the Bank's General Meeting of Shareholders held on 27 October 2020.
Earnings per share basic and diluted	Basic earnings per share for the period are calculated by dividing the net profit attributable to Grupo Santander for the six-month period adjusted by the after-tax amount relating to the remuneration of contingently convertible preference shares recognised in equity by the weighted average number of ordinary shares outstanding during the period, excluding the average number of treasury shares held in the period. Accordingly: 30-06-2021 30-06-2020 Profit attributable to the Parent (EUR million) 3,675 (10,798) Remuneration of contingently convertible preferred securities (CCPS) (EUR million) (271) (278) 3,404 (11,076) Of which: Profit or Loss from discontinued operations (non controlling interest net) (EUR million) — — Profit or Loss from continuing operations (CCPS net) (EUR million) 3,404 (11,076) Weighted average number of shares outstanding 17,309,951,841 16,598,649,355 Impact factor correction (a) Not applicable 721,680,407 Adjusted number of shares 17,309,951,841 17,320,329,762 Basic earnings per share (euros) 0.20 (0.64) Of which: from discontinued operations (euros) — — from continuing operations (euros) 0.20 (0.64) (a) Correction factor for the capital increase on 3 December 2020 (see note 1.e). ii. Diluted earnings per share Diluted earnings per share for the period are calculated by dividing the net profit attributable to Grupo Santander for the six-month period adjusted by the after-tax amount relating to the remuneration of contingently convertible preference shares recognised in equity and of perpetual liabilities contingently amortisable in their case by the weighted average number of ordinary shares outstanding during the period, excluding the average number of treasury shares and adjusted for all the dilutive effects inherent to potential ordinary shares (share options, warrants and convertible debt instruments). Accordingly, diluted earnings per share were determined as follows: 30-06-2021 30-06-2020 Profit attributable to the Parent (EUR million) 3,675 (10,798) Remuneration of contingently convertible preferred securities (CCPS) (EUR million) (271) (278) 3,404 (11,076) Of which: Profit or Loss from discontinued operations (non controlling interest net) (EUR million) — — Profit or Loss from continuing operations (CCPS net) (EUR million) 3,404 (11,076) Weighted average number of shares outstanding 17,309,951,841 16,598,649,355 Dilutive effect of options/receipt of shares 48,815,931 Not applicable Impact factor correction (a) Not applicable 721,680,407 Adjusted number of shares 17,358,767,772 17,320,329,762 Diluted earnings per share (euros) 0.20 (0.64) Of which: from discontinued operations (euros) — — from continuing operations (euros) 0.20 (0.64) (a) Correction factor for the capital increase on 3 December 2020 (see note 1.e).

Remuneration and other benefi_2

Remuneration and other benefits paid to the Bank's directors and senior managers (Tables)	6 Months Ended
	Jun. 30, 2021
Remuneration and other benefits paid to the Bank's directors and senior managers
Schedule of total remuneration paid	Following is a summary of the most significant data on the remunerations and benefits for the six months ended 30 June 2021 and 2020: Remuneration of members of the board of directors (1) Thousand euros 30-06-2021 30-06-2020 Members of the board of directors: (2)(3)(4)(5)(6)(7)(8)(9) Remuneration concept Fixed salary remuneration of executive directors 3,234 2,859 Variable salary remuneration of executive directors — — Directors fees 590 605 Bylaw-stipulated emoluments (annual emolument) 1,857 1,637 Other (except insurance premiums) 1,236 1,416 Sub-total 6,917 6,517 Transactions with shares and/or other financial instruments — — 6,917 6,517 (1) The Notes to the consolidated annual accounts for 2021 will contain detailed and complete information on the remuneration paid to all the directors, including executive directors. (2) Mr Rodrigo Echenique ceased to be a non-executive director on 22 December 2020. (3) Mr Sergio Rial was appointed as executive director since 30 May 2020. (4) Mr Luis Isasi was appointed as director since 19 May 2020. (5) Mr Guillermo de la Dehesa ceased to be a director on 3 April 2020. (6) Mr Ignacio Benjumea ceased to be a director on 5 May 2020. (7) Ms Esther Giménez-Salinas ceased to be a director on 27 October 2020. (8) Ms Gina Díez was appointed as director since 22 December 2020. (9) Mr Ramón Martín Chávez was appointed as director since 27 October 2020. The table below includes the corresponding amounts related to remunerations of senior management at 30 June 2021 and 2020, excluding the executive directors: Thousand euros 30-06-2021 30-06-2020 Senior management (1) Total remuneration of senior management (2) 14,014 15,275 (1) Remunerations received during the first six months by members of the senior management who ceased in their functions by 30 June 2021, amounted to 2,690 thousand euros (EUR 2,822 thousand at 30 June 2020). (2) The number of members of Banco Santander's senior management, excluding executive directors, is 16 as at 30 June 2021 (30 June 2020 : 17).
Schedule of other benefits of the directors	Thousand euros 30-06-2021 30-06-2020 Members of the board of directors Other benefits Advances — — Loans granted 73 34 Pension funds and plans: Endowments and/or contributions (1) 912 1,010 Pension funds and plans: Accumulated rights (2) 68,317 79,015 Life insurance premiums 677 896 Guarantees provided for directors — — (1) These correspond to the endowments and/or contributions made during the first six months of 2021 and 2020 in respect of retirement pensions and complementary benefits for widowhood, orphanhood and permanent disability. (2) Corresponds to the rights accrued by the directors in matters of pensions. Additionally, former members of the board had at 30 June 2021 and 30 June 2020 rights accrued for this concept for EUR 50,107 thousand and EUR 56,778 thousand, respectively.
Schedule of funds and pension plans of senior management	Thousand euros 30-06-2021 30-06-2020 Senior management (1) Pension funds: Endowments and / or contributions (2) 2,917 2,987 Pension funds: Accumulated rights (3) 57,372 55,229 (1) Remunerations received as endowments and/or contributions to pension funds during the first six months by members of the senior management who ceased in their functions by 30 June 2021, amounted to EUR 195 thousand (EUR 178 thousand at 30 June 2020). (2) Corresponds to the allocations and/or contributions made during the first six months of 2021 and 2020 as retirement pensions. (3) Corresponds to the rights accrued by members of senior management in the area of pensions. In addition, former members of senior management had at 30 June 2021 and 30 June 2020 rights accumulated for this same concept for EUR 132,597 thousand and EUR 160,278 thousand, respectively.

Financial assets (Tables)

Financial assets (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure of financial assets [abstract]
Schedule of components of financial assets	The detail, by nature and category for measurement purposes, of Grupo Santander's financial assets, other than the balances relating to Cash, cash balances at central banks and other deposits on demand and Hedging derivatives, at 30 June 2021 and 31 December 2020 is as follows, presented by the nature and categories for valuation purposes: EUR million 30-06-2021 Financial Non-trading Financial Financial Financial Derivatives 54,867 Equity instruments 13,545 3,607 2,751 Debt instruments 34,114 810 2,763 103,549 29,038 Loans and advances 265 421 53,723 8,205 974,379 Central Banks — — 4,881 — 13,548 Credit institutions — — 23,910 — 40,136 Customers 265 421 24,932 8,205 920,695 Total 102,792 4,838 56,486 114,505 1,003,417 EUR million 31-12-2020 Financial Non-trading Financial Financial Financial Derivatives 67,137 Equity instruments 9,615 3,234 2,783 Debt instruments 37,894 700 2,979 108,903 26,078 Loans and advances 299 552 45,738 9,267 932,300 Central Banks — — 9,481 — 12,499 Credit institutions 3 — 12,136 — 37,838 Customers 296 552 24,121 9,267 881,963 Total 114,945 4,486 48,717 120,953 958,378
Disclosure of concentrations	Following is the gross exposure of financial assets subject to impairment stages at 30 June 2021 and 31 December 2020: EUR million 30-06-2021 31-12-2020 Gross amount Gross amount Stage 1 Stage 2 Stage 3 Total Stage 1 Stage 2 Stage 3 Total Financial assets at fair value through other comprehensive income 111,684 29 101 111,814 118,150 6 50 118,206 Debt instruments 103,554 1 6 103,561 108,903 6 6 108,915 Loans and advances 8,130 28 95 8,253 9,247 — 44 9,291 Central Banks — — — — — — — — Credit institutions — — — — — — — — Customers 8,130 28 95 8,253 9,247 — 44 9,291 Financial assets at amortised cost 927,729 66,964 32,045 1,026,738 884,892 66,170 30,670 981,732 Debt instruments 28,773 118 435 29,326 25,889 66 395 26,350 Loans and advances 898,956 66,846 31,610 997,412 859,003 66,104 30,275 955,382 Central Banks 13,548 — — 13,548 12,499 — — 12,499 Credit institutions 40,142 — — 40,142 37,845 — 1 37,846 Customers 845,266 66,846 31,610 943,722 808,659 66,104 30,274 905,037 Total 1,039,413 66,993 32,146 1,138,552 1,003,042 66,176 30,720 1,099,938
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments	The following is the movement that has taken place, during the six -month periods ended 30 June 2021 and 2020, in the balance of provisions that cover losses due to impairment of assets which comprise the heading balance of the financial assets at amortised cost: EUR million 30-06-2021 30-06-2020 Balance as at beginning of period 23,849 22,713 Impairment losses charged to income for the period 4,384 7,441 Of which: Impairment losses charged to income 9,778 12,616 Impairment losses reversed with a credit to income (5,394) (5,175) Write-off of impaired balances against recorded impairment allowance (4,353) (5,183) Exchange differences and other (57) (1,716) Balance as at end of period 23,823 23,255 Of which, relating to: Impaired assets 14,101 13,571 Other assets 9,722 9,684 Of which: Individually calculated 3,077 3,358 Collectively calculated 20,746 19,897 Following is the movement of the loan loss provision broken down by impairment stage of loans and advances to customers recognised under 'Financial assets at amortised cost' as at 30 June 2021 and 30 June 2020: EUR million 30-06-2021 Stage 1 Stage 2 Stage 3 Total Impairment allowance as at beginning of period 4,252 5,672 13,647 23,571 Transfers between stages (474) 747 2,273 2,546 Variation due to credit risk 473 (904) 2,269 1,838 Write-offs — — (4,353) (4,353) Exchange differences and other (104) 33 (2) (73) Carrying amount at end of period 4,147 5,548 13,834 23,529 EUR million 30-06-2020 Stage 1 Stage 2 Stage 3 Total Impairment allowance as at beginning of period 3,835 4,474 13,933 22,242 Transfers between stages (722) 694 2,622 2,594 Variation due to credit risk 2,328 (327) 2,911 4,912 Write-offs — — (5,057) (5,057) Exchange differences and other (333) (290) (1,093) (1,716) Carrying amount at end of period 5,108 4,551 13,316 22,975 The table below shows the changes of these balances during the first six months of 2021: Million euros Carrying amount 30-06-2021 Beginning balances 20,997 Refinancing and restructuring of the period 10,543 Memorandum items: impact recorded in the income statement for the period 1,078 Debt repayment (2,659) Foreclosures (161) Derecognised from the consolidated balance sheet (537) Other variations (436) Balances at end of year 27,747
Disclosure of financial assets that are either past due or impaired	The movement during the six-month periods ended 30 June 2021 and 2020, in the balance of financial assets classified at amortised cost and considered impaired by reason for the credit risk is as follows: EUR million 30-06-2021 30-06-2020 Balance as at beginning of period 31,168 33,184 Net additions 4,842 5,586 Written-off assets (4,353) (5,183) Exchange differences and other 819 (1,407) Balance at end of period 32,476 32,180
Schedule of guarantees received for financial assets	Following is the breakdown of the value of the guarantees received to ensure the collection of the financial assets that comprise the heading of financial assets at amortized cost, distinguishing between real guarantees and other guarantees as of 30 June 2021 and 31 December 2020: EUR million 30-06-2021 31-12-2020 Real guarantees value 574,360 537,216 Of which: Impaired 12,239 12,106 Other guarantees value 85,342 82,314 Of which: Impaired 1,751 1,253 Total value of the guarantees received 659,702 619,530
Schedule of financial assets measured at other than fair value	Following is a comparison of the carrying amounts of Grupo Santander’s financial assets measured at other than fair value and their respective fair values at 30 June 2021 and 31 December 2020: EUR million EUR million 30-06-2021 31-12-2020 Carrying amount Fair value Carrying amount Fair value Loans and advances 974,379 981,129 932,300 940,258 Debt instruments 29,038 29,367 26,078 26,532 ASSETS 1,003,417 1,010,496 958,378 966,790

Non-current assets held for s_2

Non-current assets held for sale (Tables)	6 Months Ended
	Jun. 30, 2021
Non-current assets held for sale
Schedule of non-current assets	The detail, by nature, of Grupo Santander’s non-current assets held for sale at 30 June 2021 and 31 December 2020 is as follows presented by nature: EUR million 30-06-2021 31-12-2020 Tangible assets 4,369 4,445 Of which: Foreclosed assets 3,963 4,081 Of which: Property assets in Spain 3,370 3,485 Other tangible assets held for sale 406 364 Other assets 708 — 5,077 4,445

Intangible assets (Tables)

Intangible assets (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure of reconciliation of changes in goodwill [abstract]
Schedule of goodwill based on cash-generating units	The detail of Intangible Assets - Goodwill at 30 June 2021 and 31 December 2020, based on the cash-generating units giving rise thereto, is as follows: EUR million 30-06-2021 31-12-2020 Banco Santander (Brazil) 3,386 3,109 SAM Investment Holdings Limited 1,444 1,444 Santander Consumer Germany 1,314 1,314 Santander Bank Polska 1,114 1,104 Santander Portugal 1,040 1,040 Santander España 1,027 1,027 Santander Consumer USA 935 904 Santander UK 619 592 Santander Bank National Association 614 594 Banco Santander Chile 577 571 Grupo Financiero Santander (Mexico) 414 399 Santander Consumer Nordics 220 216 Other entities 150 157 Total Goodwill 12,854 12,471

Financial liabilities (Tables)

Financial liabilities (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure of financial liabilities [abstract]
Schedule of components of financial liabilities other than hedging derivatives	The following is a breakdown of Grupo Santander's financial liabilities, other than the balances corresponding to the Derivatives - hedge accounting heading, as of 30 June 2021 and 31 December 2020, presented by nature and categories for valuation purposes: EUR million 30-06-2021 31-12-2020 Financial Financial Financial Financial Financial Financial Derivatives 52,440 64,469 Short Positions 16,542 16,698 Deposits — 48,640 1,038,892 — 43,598 990,391 Central banks — 3,189 124,947 — 2,490 112,804 Credit institutions — 7,446 57,823 — 6,765 62,620 Customer — 38,005 856,122 — 34,343 814,967 Debt instruments — 5,491 237,739 — 4,440 230,829 Other financial liabilities — — 33,802 — — 26,968 Total 68,982 54,131 1,310,433 81,167 48,038 1,248,188 The detail of the balance of debt instruments issued according to their nature is: EUR million 30-06-2021 31-12-2020 Bonds and debentures outstanding 194,860 191,577 Subordinated 23,383 21,686 Promissory notes and other securities 24,987 22,006 Total debt instruments issued 243,230 235,269
Schedule of financial liabilities rollforward	The detail, at 30 June 2021 and 2020, of the outstanding balance of the debt instruments, excluding promissory notes, which at these dates had been issued by Banco Santander or any other Group entity is disclosed below. Also included is the detail of the changes in this balance in the first six months of 2021 and 2020: EUR million 30-06-2021 Opening Perimeter Issuances or placements Repurchases or Exchange Closing Bonds and debentures outstanding 191,577 — 33,415 (32,496) 2,364 194,860 Subordinated 21,686 — 1,578 — 119 23,383 Bonds and debentures outstanding and subordinated liabilities issued 213,263 — 34,993 (32,496) 2,483 218,243 EUR million 30-06-2020 Opening Perimeter Issuances or placements Repurchases or Exchange Closing Bonds and debentures outstanding 208,455 — 39,109 (36,749) (4,574) 206,241 Subordinated 20,878 — 1,853 (1,615) (639) 20,477 Bonds and debentures outstanding and subordinated liabilities issued 229,333 — 40,962 (38,364) (5,213) 226,718
Schedule of financial liabilities measured at other than fair value	Following is a comparison between the value by which Grupo Santander’s financial liabilities are recorded that are measured using criteria other than fair value and their corresponding fair value at 30 June 2021 and 31 December 2020: EUR million 30-06-2021 31-12-2020 Carrying amount Fair value Carrying amount Fair value Deposits 1,038,892 1,037,223 990,391 990,807 Debt instruments 237,739 246,161 230,829 241,174 Liabilities 1,276,631 1,283,384 1,221,220 1,231,981

Provisions (Tables)

Provisions (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure of provision matrix [abstract]
Schedule of other provisions by type of provision	Set forth below is the detail, by type of provision, of the balances at 30 June 2021 and at 31 December 2020 of Provisions for taxes and other legal contingencies and Other provisions. The types of provision were determined by grouping together items of a similar nature: EUR million 30-06-2021 31-12-2020 Provisions for taxes 609 600 Provisions for employment-related proceedings (Brazil) 432 437 Provisions for other legal proceedings 1,128 1,163 Provision for customer remediation 625 395 Regulatory framework-related provisions 24 69 Provision for restructuring 1,114 810 Other 946 951 4,878 4,425

Equity (Tables)

Equity (Tables)	6 Months Ended
	Jun. 30, 2021
Equity [abstract]
Schedule of other comprehensive income components	Breakdown of other comprehensive income - Items not reclassified to profit or loss and Items that may be reclassified to profit or loss EUR million 30-06-2021 31-12-2020 Other comprehensive income accumulated (32,181) (33,144) Items not reclassified to profit or loss (4,962) (5,328) Actuarial gains or losses on defined benefit pension plans (4,415) (5,002) Non-current assets held for sale — — Share in other income and expenses recognised in investments, joint ventures and associates (11) (2) Other valuation adjustments — — Changes in the fair value of equity instruments measured at fair value with changes in other comprehensive income (428) (308) Inefficacy of fair value hedges of equity instruments measured at fair value with changes — — Changes in the fair value of equity instruments measured at fair value with changes 213 159 Changes in the fair value of equity instruments measured at fair value with changes (213) (159) Changes in the fair value of financial liabilities measured at fair value through profit or loss (108) (16) Items that may be reclassified to profit or loss (27,219) (27,816) Hedge of net investments in foreign operations (effective portion) (4,125) (3,124) Exchange differences (24,032) (26,911) Hedging derivatives (effective portion) 126 295 Changes in the fair value of debt instruments measured at fair value with changes in other comprehensive income 1,250 2,411 Hedging instruments (items not designated) — — Non-current assets held for sale — — Share in other income and expenses recognised in investments, joint ventures and associates (438) (487)
Schedule of changes in fair value of equity instruments that will not be reclassified	Below is a breakdown of the composition of the balance as of 30 June 2021 and 31 December 2020 under “Other comprehensive income - Items not reclassified to profit or loss - Changes in the fair value of equity instruments measured at fair value with changes in other global result depending on the geographical origin of the issuer”: EUR million 30-06-2021 31-12-2020 Revaluation gains Revaluation losses Net revaluation gains/(losses) Fair value Revaluation gains Revaluation losses Net revaluation gains/(losses) Fair value Equity instruments Domestic Spain 28 (1,102) (1,074) 773 28 (849) (821) 1,032 International Rest of Europe 118 (75) 43 410 65 (76) (11) 314 United States 12 (4) 8 32 7 (4) 3 25 Latin America and rest 601 (6) 595 1,536 525 (4) 521 1,412 759 (1,187) (428) 2,751 625 (933) (308) 2,783 Of which: Listed 606 (31) 575 1,571 525 (31) 494 1,424 Unlisted 153 (1,156) (1,003) 1,180 100 (902) (802) 1,359
Schedule of other comprehensive income, that may be reclassified to profit or loss, by type of instrument and geographical origin of the issuer	Below is a breakdown of the composition of the balance as of 30 June 2021 and 31 December 2020 under Other comprehensive income - Items that may be reclassified to profit or loss - Changes in the fair value of debt instruments measured at fair value through other comprehensive income depending on the type of instrument and the geographical origin of the issuer: EUR million 30-06-2021 31-12-2020 Revaluation gains Revaluation losses Net revaluation gains/(losses) Fair value Revaluation gains Revaluation losses Net revaluation gains/(losses) Fair value Debt instruments Government and central banks Spain 414 — 414 14,416 693 — 693 19,314 Rest of Europe 702 (38) 664 23,326 915 (69) 846 23,116 Latin America and rest of the world 420 (323) 97 50,308 785 (73) 712 51,026 Private-sector debt instruments 117 (42) 75 23,704 181 (21) 160 24,714 1,653 (403) 1,250 111,754 2,574 (163) 2,411 118,170

Segment Information (Primary _2

Segment Information (Primary segment) (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure of operating segments [abstract]
Schedule of revenue by segment	Following is the reconciliation between the adjusted profit and the statutory profit corresponding to the six-month period ended 30 June 2021 and 2020: EUR million Revenue from ordinary activities Profit before taxes Profit Segment 30-06-2021 30-06-2020 30-06-2021 30-06-2020 30-06-2021 30-06-2020 Europe 10,862 10,866 2,151 800 1,426 529 North America 7,315 8,315 2,545 878 1,628 616 South America 10,580 12,902 3,113 2,460 1,645 1,382 Digital Consumer Bank 3,245 3,119 1,008 889 569 507 Corporate Centre (168) 165 (1,188) (1,185) (1,063) (1,125) Underlying Profit 31,834 35,368 7,629 3,842 4,205 1,909 Adjustments — — (715) (10,252) (530) (12,707) Statutory Profit 31,834 35,368 6,914 (6,410) 3,675 (10,798)

Related parties (Tables)

Related parties (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure of transactions between related parties [abstract]
Schedule of related party transactions	Following is a detail of the transactions performed by Grupo Santander with its related parties in the first six months of 2021 and 2020, distinguishing between significant shareholders, members of Banco Santander’s board of directors, Banco Santander’s executive vice presidents, Grupo Santander entities and other related parties. Related party transactions were made on terms equivalent to those that prevail in arm’s-length transactions or, when this was not the case, the related compensation in kind was recognised: EUR million 30-06-2021 Expenses and income Significant shareholders Directors and executives Group companies or entities Other related parties Total Expenses Finance costs — — 4 — 4 Leases — — — — — Services received — — — — — Purchases of stocks — — — — — Other expenses — — 44 — 44 — — 48 — 48 Income Finance income — — 44 1 45 Dividends received — — — — — Services rendered — — — — — Sale of stocks — — — — — Other income — — 613 — 613 — — 657 1 658 EUR million 30-06-2021 Other transactions Significant shareholders Directors and executives Group companies or entities Other related parties Total Financing agreements: loans and capital contributions (lender) — (1) 492 (32) 459 Financing agreements: loans and capital contributions (borrower) — 3 (503) 81 (419) Guarantees provided — — — — — Guarantees received — — — — — Commitments acquired — — (38) 6 (32) Dividends and other distributed profit — 1 — 5 6 Other transactions — — (7) — (7) EUR million 30-06-2021 Balance closing period Significant shareholders Directors and executives Group companies or entities Other related parties Total Debt balances: Customers and commercial debtors — — — — — Loans and credits granted — 20 7,988 21 8,029 Other collection rights — — 963 — 963 — 20 8,951 21 8,992 Credit balances: Suppliers and creditors granted — — — — — Loans and credits received — 19 2,998 237 3,254 Other payment obligations — — 85 — 85 — 19 3,083 237 3,339 EUR million 30-06-2020 Expenses and income Significant shareholders Directors and executives Group companies or entities Other related parties Total Expenses Finance costs — — 4 — 4 Leases — — — — — Services received — — — — — Purchases of stocks — — — — — Other expenses — — 15 — 15 — — 19 — 19 Income Finance income — — 58 — 58 Dividends received — — — — — Services rendered — — — — — Sale of stocks — — — — — Other income — — 548 — 548 — — 606 — 606 EUR million 30-06-2020 Other transactions Significant shareholders Directors and executives Group companies or entities Other related parties Total Financing agreements: loans and capital contributions (lender) — (1) (324) (8) (333) Financing agreements: loans and capital contributions (borrower) — (14) 148 30 164 Guarantees provided — — (1) — (1) Guarantees received — — — — — Commitments acquired — (1) (83) 5 (79) Dividends and other distributed profit — — — — — Other transactions — — (1,010) — (1,010) EUR million 31-12-2020 Balance closing period Significant shareholders Directors and executives Group companies or entities Other related parties Total Debt balances: Customers and commercial debtors — — — — — Loans and credits granted — 24 7,497 95 7,616 Other collection rights — — 976 — 976 — 24 8,473 95 8,592 Credit balances: Suppliers and creditors granted — — — — — Loans and credits received — 20 3,501 159 3,680 Other payment obligations — — 92 — 92 — 20 3,593 159 3,772

Off-balance-sheet exposures (Ta

Off-balance-sheet exposures (Tables)	6 Months Ended
	Jun. 30, 2021
Off-balance-sheet exposures
Schedule of contingent commitments	EUR million 30-06-2021 31-12-2020 Loan commitments granted 247,154 241,230 Of which impaired 249 274 Financial guarantees granted 12,121 12,377 Of which impaired 174 124 Bank sureties 12,079 12,358 Credit derivatives sold 42 19 Other commitments granted 81,277 64,538 Of which impaired 703 548 Other granted guarantees 38,250 33,526 Other 43,027 31,012

Average headcount and number _2

Average headcount and number of branches (Tables)	6 Months Ended
	Jun. 30, 2021
Average headcount and number of offices
Schedule of average number of employees	The average number of employees at Banco Santander and Grupo Santander, by gender, in the six-month periods ended 30 June 2021 and 2020 is as follows: Average headcount Bank Group 30-06-2021 30-06-2020 30-06-2021 30-06-2020 Men 12,682 13,942 87,382 88,763 Women 11,979 12,681 103,108 106,398 24,661 26,623 190,490 195,161
Schedule of number of offices	The number of branches at 30 June 2021 and 31 December 2020 is as follow: Number of branches Group 30-06-2021 31-12-2020 Spain 1,997 2,989 Group 8,076 8,247 10,073 11,236

Other disclosures (Tables)

Other disclosures (Tables)	6 Months Ended
	Jun. 30, 2021
Credit risk
Summary of fair values of financial assets and liabilities	The following table shows a summary of the fair values, at 30 June 2021 and 31 December 2020, of the financial assets and liabilities indicated below, classified on the basis of the various measurement methods used by Grupo Santander to determine their fair value: EUR million 30-06-2021 31-12-2020 Published price quotations in active markets (Level 1) Internal models (Levels 2 and 3) Total Published price quotations in active markets (Level 1) Internal models (Levels 2 and 3) Total Financial assets held for trading 46,807 55,985 102,792 46,379 68,566 114,945 Non-trading financial assets mandatorily at fair value through profit or loss 2,129 2,709 4,838 1,756 2,730 4,486 Financial assets at fair value through profit and loss 2,243 54,243 56,486 2,509 46,208 48,717 Financial assets at fair value through other comprehensive income 86,515 27,990 114,505 91,771 29,182 120,953 Hedging derivatives (assets) — 5,430 5,430 — 8,325 8,325 Financial liabilities held for trading 12,862 56,120 68,982 9,863 71,304 81,167 Financial liabilities designated at fair value through profit or loss 3,451 50,680 54,131 2,118 45,920 48,038 Hedging derivatives (liabilities) — 6,573 6,573 — 6,869 6,869 Liabilities under insurance contracts — 1,014 1,014 — 910 910
Schedule of financial instruments at fair value whose measurement was based on internal models (Levels 2 and 3)	Set forth below are the financial instruments at fair value whose measurement was based on internal models (levels 2 and 3) at 30 June 2021 and 31 December 2020: EUR million EUR million Fair values calculated using internal models at 30-06-2021(*) Fair values calculated using internal models at 31-12-2020 (*) Level 2 Level 3 Level 2 Level 3 Valuation techniques Main inputs ASSETS 137,823 8,534 146,468 8,543 Financial assets held for trading 55,374 611 67,826 740 Credit institutions — — 3 — Present value method Yield curves, FX market prices Customers (**) 265 — 296 — Present value method Yield curves, FX market prices Debt instruments and equity instruments 1,214 22 1,453 10 Present value method Yield curves, FX market prices Derivatives 53,895 589 66,074 730 Swaps 44,666 233 54,488 272 Present value method, Gaussian Copula (***) Yield curves, FX market prices, HPI, Basis, Liquidity Exchange rate options 451 33 696 22 Black-Scholes Model Yield curves, Volatility surfaces, FX market prices, Liquidity Interest rate options 2,429 185 3,129 241 Black's Model, multifactorial advanced models interest rate Yield curves, Volatility surfaces, FX market prices, Liquidity Interest rate futures 501 — 1,069 — Present value method Yield curves, FX market prices Index and securities options 667 66 554 94 Black’s Model, multifactorial advanced models interest rate Yield curves, Volatility surfaces, FX & EQ market prices, Dividends, Liquidity. Other 5,181 72 6,138 101 Present value method, Advanced stochastic volatility models and other Yield curves, Volatility surfaces, FX and EQ market prices, Dividends, Liquidity, Dividends, Correlation, HPI, Credit, Others. Hedging derivatives 5,430 — 8,325 — Swaps 5,150 — 6,998 — Present value method Yield curves, FX market prices, Basis Interest rate options 24 — 25 — Black-Scholes Model Yield curves, FX market prices, Volatility surfaces, Liquidity Other 256 — 1,302 — Present value method, Advanced stochastic volatility models and other Yield curves, Volatility surfaces, FX market prices, Credit, Liquidity, Others Non-trading financial assets mandatorily at fair value through profit or loss 1,240 1,469 1,796 934 Equity instruments 428 1,053 984 505 Present value method Market price, Interest rates curves, Dividends and Others Debt instruments 657 150 555 134 Present value method Yield curves Loans and receivables (**) 155 266 257 295 Present value method, swap asset model & CDS Yield curves and Credit curves Financial assets designated at fair value through profit or loss 53,765 478 45,559 649 Central banks 4,881 — 9,481 — Present value method Yield curves, FX market prices Credit institutions 23,910 — 11,973 163 Present value method Yield curves, FX market prices Customers (****) 24,916 17 24,102 19 Present value method Yield curves, FX market prices, HPI Debt instruments 58 461 3 467 Present value method Yield curves, FX market prices Financial assets at fair value through other comprehensive income 22,014 5,976 22,962 6,220 Equity instruments 74 1,064 75 1,223 Present value method Market price, Interest rates curves, Dividends and Others Debt instruments 18,403 244 18,410 206 Present value method Yield curves, FX market prices Loans and receivables 3,537 4,668 4,477 4,791 Present value method Yield curves, FX market prices and Credit curves LIABILITIES 113,764 623 124,098 905 Financial liabilities held for trading 55,864 256 71,009 295 Derivatives 51,846 256 63,920 295 Swaps 42,360 57 51,584 81 Present value method, Gaussian Copula (***) Yield curves, FX market prices, Basis, Liquidity, HPI Exchange rate options 530 23 724 1 Black-Scholes Model Yield curves, Volatility surfaces, FX market prices, Liquidity Interest rate options 3,050 36 4,226 49 Black-Scholes Model, multifactorial advanced models interest rate Yield curves, Volatility surfaces, FX market prices, Liquidity Index and securities options 657 132 456 97 Black-Scholes Model Yield curves, FX market prices Interest rate and equity futures 242 — 1,054 2 Present value method Yield curves, Volatility surfaces, FX & EQ market prices, Dividends Other 5,007 8 5,876 65 Present value method, Advanced stochastic volatility models Yield curves, Volatility surfaces, FX & EQ market prices, Dividends, Correlation, Liquidity, HPI, Credit, Others Short positions 4,018 — 7,089 — Present value method Yield curves ,FX & EQ market prices, Equity Hedging derivatives 6,573 — 6,869 — Swaps 5,247 — 5,821 — Present value method Yield curves ,FX & EQ market prices, Basis Interest rate options 11 — 13 — Black's Model Yield curves , Volatility surfaces, FX market prices, Liquidity Other 1,315 — 1,035 — Present value method, Advanced stochastic volatility models and other Yield curves , Volatility surfaces, FX market prices, Credit, Liquidity, Other Financial liabilities designated at fair value through profit or loss 50,313 367 45,310 610 Present value method Yield curves, FX market prices Liabilities under insurance contracts 1,014 — 910 — Present Value Method with actuarial techniques Mortality tables and interest rate curves (*) The internal models of level 2 implement figures based on the parameters observed in the market, while Level 3 internal models uses significant inputs that are not observable in market data. (**) Includes mainly short-term loans and reverse repurchase agreements with corporate customers (mainly brokerage and investment companies). (***) Includes credit risk derivatives with a negative net fair value of EUR -3 an d EUR -4 million recognised in the interim condensed consolidated balance sheet 30 June 2021 and 31 December 2020. These assets and liabilities are measured using the Standard Gaussian Copula Model. (****) Includes residential mortgages to financial institutions in the United Kingdom (which are regulated and partly financed by the Government). The fair value of these loans has been obtained using observable market variables, including current market transactions of similar amount and guarantees provided by the UK Housing Association. Given that the Government is involved in these entities, credit risk spreads have remained stable and homogeneous in this sector. The results arising from the valuation model are contrasted against current market transactions.
Schedule of effect on fair value of financial instruments classified as Level 3 of a reasonable change in the assumptions used in the valuation	The table below shows the effect, at 30 June 2021, on the fair value of the main financial instruments classified as Level 3 of a reasonable change in the assumptions used in the valuation. This effect was determined by applying the probable valuation ranges of the main unobservable inputs detailed in the following table: Portfolio/Instrument Valuation technique Main unobservable inputs Range Weighted average Impacts (EUR million) (Level 3) Unfavourable scenario Favourable scenario Held for trading (Assets) Derivatives Cap&Floor Volatility option model Volatility 10% - 90% 34.73% — — CCS Discounted Cash Flows Interest rate -0.7%-0.7% 0.66% (0.19) 0.19 CCS Forward estimation Interest rate 3bp - 4bp 0.83% (0.05) 0.06 Convertibility curve - inputs: NDFs Offshore Forward estimation Price 0% - 2% 0.61% (0.72) 0.31 EQ Options EQ option pricing model Volatility 0%- 90% 61.20% (0.32) 0.67 EQ Options Local volatility Volatility 10% - 90% 40.00% (2.11) 2.11 FRAs Asset Swap model Interest rate 0% - 4% 1.78% (0.83) 0.66 FX Options FX option pricing model Volatility 0% - 50% 32.14% (0.36) 0.65 Inflation Derivatives Asset Swap model Inflation Swap Rate -100%-50% 83.33% (0.68) 0.34 Inflation Derivatives Volatility option model Volatility 0% - 40% 13.29% (0.43) 0.22 IR Futures Asset Swap model Interest rate 0% - 15% 5.91% (0.99) 0.64 IR Options IR option pricing model Volatility 0% - 100% 60.47% (0.27) 0.41 IRS Asset Swap model Interest rate 0% - 15% 10.71% (0.06) 0.16 IRS Discounted Cash Flows Swap Rate 7.4% - 7.9% (2.64)% (0.16) 0.07 IRS Forward Estimation Prepayment rate 6% - 12% 9.00% — — IRS Prepayment modelling Prepayment rate 2.5% - 6.2% 0.50% (0.13) 0.07 IRS Others Others n.a. n.a. (1.40) 1.40 Property derivatives Option pricing model Growth rate 0% - 5% 2.50% (9.55) 9.55 Swaptions IR option pricing model Volatility 0% - 40% 26.67% (0.16) 0.31 At Fair Value through P&L Loans and advances to customers Mortgage portfolio Black Scholes model Growth rate 0% - 5% 2.50% (2.33) 2.33 Loans Discounted Cash Flows Credit spreads 0.1% - 1.4% 0.67% (0.26) 0.26 Debt securities Government debt Discounted Cash Flows Interest rate 0% - 10% 8.33% (5.92) 29.58 Property securities Probability weighting Growth rate 0% - 5% 2.50% (1.28) 1.28 Mandatorily Fair Value through P&L Loans and advances to customers Loans Discounted Cash Flows Margin of a reference portfolio -1bp-1bp 1bp (1.38) 3.09 Debt securities Corporate debt Discounted Cash Flows Margin of a reference portfolio -1bp-1bp 1bp (0.56) 0.60 Equity instruments Equities Price Based Price 90% - 110% 10.00% (105.26) 105.26 At Fair Value through OCI Loans and advances to customers Loans Discounted Cash Flows Credit spread n.a. n.a. (3.90) — Loans Discounted Cash Flows Interest rate curve -0.1%-0.1% 0.12% (0.14) 0.14 Portfolio/Instrument Valuation technique Main unobservable inputs Range Weighted average Impacts (EUR million) (Level 3) Unfavourable scenario Favourable scenario Loans Discounted Cash Flows Credit spreads 0.1% - 1.4% 0.67% (0.26) 0.26 Debt securities Government debt Discounted Cash Flows Interest rate 1.2% - 1.4% 0.10% — — Equity instruments Equities Price Based Price 90% - 110% 10.00% (106.40) 106.40 Held for trading (Liabilities) Derivatives Cap&Floor Volatility option model Volatility 10% - 90% 34.73% — — EQ Options Option pricing model Correlations (100)% - 100% 100.00% (0.04) 0.04 FX Options FX option pricing model Volatility 2Vegas - 13.4Vegas 12.26% — 0.01 Property derivatives Option pricing model Growth rate 0% - 5% 2.50% (2.80) 2.80 IRS Forward estimation Prepayment rate 6% - 12% 9.00% — —
Schedule of changes in financial instruments classified as Level 3	Lastly, the changes in the financial instruments classified as Level 3 in the first six months of 2021 were as follows: 01-01-2021 Changes 30-06-2021 EUR million Fair value calculated using internal models (Level 3) Purchases/Settlements Sales/Amortisation Changes in fair value recognized in profit or loss Changes in fair value recognised in equity Level reclassifications Other Fair value calculated using internal models (Level 3) Financial assets held for trading 740 67 (91) (51) — (59) 5 611 Debt instruments 7 17 (2) (3) — — — 19 Equity instruments 3 — (1) 1 — — — 3 Trading derivatives 730 50 (88) (49) — (59) 5 589 Swaps 272 5 (12) (29) — (1) (2) 233 Exchange rate options 22 14 (27) 24 — — — 33 Interest rate options 241 7 (39) (24) — — — 185 Index and securities options 94 11 (4) 20 — (59) 4 66 Other 101 13 (6) (40) — 1 3 72 Trading financial assets at fair value through profit or loss 649 53 (127) 35 — (163) 31 478 Credit institutions 163 — — — — (163) — — Loans and advances to customers 19 — (2) — — — — 17 Debt instruments 467 53 (125) 35 — — 31 461 Non-trading financial assets mandatorily at fair value through profit or loss 934 97 (114) 7 — 515 30 1,469 Loans and advances to customers 295 56 (71) (18) — — 4 266 Debt instruments 134 — (11) 6 — 12 9 150 Equity instruments 505 41 (32) 19 — 503 17 1,053 Financial assets at fair value through other comprehensive income 6,220 2,941 (2,825) — (127) (260) 27 5,976 Loans and advances to customers 4,792 2,865 (2,782) — (18) (192) 3 4,668 Debt instruments 206 74 (25) — 40 (68) 17 244 Equity instruments 1,222 2 (18) — (149) — 7 1,064 TOTAL ASSETS 8,543 3,158 (3,157) (9) (127) 33 93 8,534 Financial liabilities held for trading 295 27 (27) (23) — (25) 9 256 Trading derivatives 295 27 (27) (23) — (25) 9 256 Swaps 81 3 (3) (19) — (4) (1) 57 Exchange rate options 1 — — 21 — — 1 23 Interest rate options 49 6 (13) (6) — — — 36 Index and securities options 97 16 (4) 34 — (21) 10 132 Interest rate and equity futures 2 — (2) — — — — — Others 65 2 (5) (53) — — (1) 8 Financial liabilities designated at fair value through profit or loss 610 — — 25 — (289) 21 367 TOTAL LIABILITIES 905 27 (27) 2 — (314) 30 623
Schedule of sovereign risk	The detail at 30 June 2021 and 31 December 2020, by type of financial instrument, of Grupo Santander credit institutions’ sovereign risk exposure to Europe’s peripheral countries and of the short positions exposed to them, taking into consideration the scope established by the European Banking Authority (EBA) in the analyses performed on the capital needs of European credit institutions (See Note 50 to the consolidated annual accounts for 2020), is as follows: Sovereign risk by country of issuer/borrower at 30 June 2021 (*) EUR million Debt instruments MtM Derivatives (***) Financial assets held for trading and Financial assets designated at fair value through profit or loss Short positions Financial assets at fair value through other comprehensive income Non-trading financial assets mandatorily at fair value through profit or loss Financial assets at amortised cost Loans and advances to customers (**) Total net direct exposure Other than CDSs CDSs Spain 7,427 (5,146) 2,928 — 1,010 13,022 19,241 326 — Portugal 243 (205) 2,299 — 547 4,231 7,115 — — Italy 1,765 (1,171) 3,882 — 51 17 4,544 1 (1) Ireland — — — — — — — — — (*) I nformation prepared under EBA standards. Also, there are government debt instruments on insurance companies balance sheets amounting to EUR 13,450 million (of which EUR 11,804 million, EUR 1,164 million, EUR 470 million and EUR 12 million relate to Spain, Portugal, Italy and Ireland, respectively) and off-balance-sheet exposure other than derivatives – contingent liabilities and commitments – amounting to EUR 4,989 million (of which EUR 4,649 million, EUR 286 million and EUR 54 million to Spain, Portugal and Italy, respectively). (**) Presented without taking into account the valuation adjustments recognised (EUR 17 million). (***) "Other than CDSs" refers to the exposure to derivatives based on the location of the counterparty, irrespective of the location of the underlying. “CDSs” refers to the exposure to CDSs based on the location of the underlying. Sovereign risk by country of issuer/borrower at 31 December 2020 (*) EUR million Debt instruments MtM Derivatives (***) Financial assets held for trading and Financial assets designated at fair value through profit or loss Short positions Financial assets at fair value through other comprehensive income Non-trading financial assets mandatorily at fair value through profit or loss Financial assets at amortised cost Loans and advances to customers (**) Total net direct exposure Other than CDSs CDSs Spain 9,765 (5,665) 7,048 — 993 12,104 24,245 546 — Portugal 202 (582) 4,148 — 631 4,331 8,730 — — Italy 556 (307) 2,468 — 1,277 21 4,015 1 (1) Ireland — — — — — — — — — (*) Information prepared under EBA standards. Also, there are government debt instruments on insurance companies balance sheets amounting to EUR 14,241 million (of which EUR 12,571 million, EUR 1,281 million, EUR 387 million and EUR 2 million relate to Spain, Portugal, Italy and Ireland, respectively) and off-balance-sheet exposure different to derivatives – contingent liabilities and commitments – amounting to EUR 6,134 million (EUR 5,509 million, EUR 345 million and EUR 280 million to Spain, Portugal and Italy, respectively). (**) Presented without taking into account the valuation adjustments recognised (EUR 23 million). (***)"Other than CDSs" refers to the exposure to derivatives based on the location of the counterparty, irrespective of the location of the underlying. “CDSs” refers to the exposure to CDSs based on the location of the underlying.
Schedule of other counterparties risk	The detail of Grupo Santander’s other exposure to other counterparties (private sector, central banks and other public entities that are not considered to be sovereign risks) in the aforementioned countries at 30 June 2021 and 31 December 2020 is as follows: Exposure to other counterparties by country of issuer/borrower at 30 June 2021 (*) EUR million Debt instruments Derivatives (***) Balances with central banks Reverse repurchase agreements Financial assets held for trading and Financial assets designated at FVTPL Financial assets at fair value through other comprehensive income Non-trading financial assets mandatorily at fair value through profit or loss Financial assets at amortised cost Loans and advances to customers (**) Total net direct exposure Other than CDSs CDSs Spain 68,708 3,574 456 903 82 490 202,824 277,037 1,213 (2) Portugal 6,922 0 187 29 — 2,955 35,647 45,740 520 — Italy 321 7,340 342 553 — 147 14,794 23,497 510 (4) Greece — — — — — — 18 18 — — Ireland — 176 68 2,756 591 734 11,556 15,881 127 — (*) Also, Grupo Santander has off-balance-sheet exposure other than derivatives -contingent liabilities and commitments- amounting to EUR 77,418 million, EUR 8,392 million, EUR 6,318 million and EUR 975 million to counterparties in Spain, Portugal, Italy and Ireland, respectively. (**) Presented without taking into account valuation adjustments or impairment corrections (EUR 8,084 million). (***)“Other than CDSs” refers to the exposure to derivatives based on the location of the counterparty, irrespective of the location of the underlying. “CDSs” refers to the exposure to CDSs based on the location of the underlying. Exposure to other counterparties by country of issuer/borrower at 31 December 2020 (*) EUR million Debt instruments Derivatives (***) Balances with central banks Reverse repurchase agreements Financial assets held for trading and Financial assets designated at FVTPL Financial assets at fair value through other comprehensive income Non-trading financial assets mandatorily at fair value through profit or loss Financial assets at amortised cost Loans and advances to customers (**) Total net direct exposure Other than CDSs CDSs Spain 62,023 3,837 619 943 2 24 203,226 270,674 2,581 (4) Portugal 3,937 — 140 22 — 2,933 34,935 41,967 685 — Italy 10 7,098 425 493 — 129 13,437 21,592 1,001 (4) Greece — — — — — — 14 14 — — Ireland — — 22 2,337 556 9 10,523 13,447 153 — (*) Also, Grupo Santander has off-balance-sheet exposure other than derivatives - contingent liabilities and commitments- amounting to EUR 76,377 million, EUR 8,591 million, EUR 4,173 million, EUR 200 million and EUR 797 million to counterparties in Spain, Portugal, Italy, Greece and Ireland, respectively. (**) They are presented without taking into account valuation adjustments or impairment corrections (EUR 8,129 million). (***)“Other than CDSs” refers to the exposure to derivatives based on the location of the counterparty, irrespective of the location of the underlying. “CDSs” refers to the exposure to CDSs based on the location of the underlying.
Schedule of credit default swaps	Following is certain information on the notional amounts of the CDSs detailed in the foregoing tables at 30 June 2021 and 31 December 2020: 30-06-2021 EUR million Notional amount Fair value Bought Sold Net Bought Sold Net Spain Sovereign — — — — — — Other 611 315 296 (14) 12 (2) Portugal Sovereign — — — — — — Other 52 — 52 — — — Italy Sovereign 327 205 122 (2) 1 (1) Other 220 110 110 (5) 1 (4) Greece Sovereign — — — — — — Other — — — — — — Ireland Sovereign — — — — — — Other — 6 (6) — — — 31-12-2020 EUR million Notional amount Fair value Bought Sold Net Bought Sold Net Spain Sovereign — — — — — — Other 546 273 273 (13) 9 (4) Portugal Sovereign — — — — — — Other 52 — 52 — — — Italy Sovereign 326 206 120 (3) 2 (1) Other 220 11 209 (4) — (4)
Schedule of changes in loss allowance and gross carrying amount	The following is the movement that has taken place, during the six -month periods ended 30 June 2021 and 2020, in the balance of provisions that cover losses due to impairment of assets which comprise the heading balance of the financial assets at amortised cost: EUR million 30-06-2021 30-06-2020 Balance as at beginning of period 23,849 22,713 Impairment losses charged to income for the period 4,384 7,441 Of which: Impairment losses charged to income 9,778 12,616 Impairment losses reversed with a credit to income (5,394) (5,175) Write-off of impaired balances against recorded impairment allowance (4,353) (5,183) Exchange differences and other (57) (1,716) Balance as at end of period 23,823 23,255 Of which, relating to: Impaired assets 14,101 13,571 Other assets 9,722 9,684 Of which: Individually calculated 3,077 3,358 Collectively calculated 20,746 19,897 Following is the movement of the loan loss provision broken down by impairment stage of loans and advances to customers recognised under 'Financial assets at amortised cost' as at 30 June 2021 and 30 June 2020: EUR million 30-06-2021 Stage 1 Stage 2 Stage 3 Total Impairment allowance as at beginning of period 4,252 5,672 13,647 23,571 Transfers between stages (474) 747 2,273 2,546 Variation due to credit risk 473 (904) 2,269 1,838 Write-offs — — (4,353) (4,353) Exchange differences and other (104) 33 (2) (73) Carrying amount at end of period 4,147 5,548 13,834 23,529 EUR million 30-06-2020 Stage 1 Stage 2 Stage 3 Total Impairment allowance as at beginning of period 3,835 4,474 13,933 22,242 Transfers between stages (722) 694 2,622 2,594 Variation due to credit risk 2,328 (327) 2,911 4,912 Write-offs — — (5,057) (5,057) Exchange differences and other (333) (290) (1,093) (1,716) Carrying amount at end of period 5,108 4,551 13,316 22,975 The table below shows the changes of these balances during the first six months of 2021: Million euros Carrying amount 30-06-2021 Beginning balances 20,997 Refinancing and restructuring of the period 10,543 Memorandum items: impact recorded in the income statement for the period 1,078 Debt repayment (2,659) Foreclosures (161) Derecognised from the consolidated balance sheet (537) Other variations (436) Balances at end of year 27,747
Disclosure of concentrations	Following is the gross exposure of financial assets subject to impairment stages at 30 June 2021 and 31 December 2020: EUR million 30-06-2021 31-12-2020 Gross amount Gross amount Stage 1 Stage 2 Stage 3 Total Stage 1 Stage 2 Stage 3 Total Financial assets at fair value through other comprehensive income 111,684 29 101 111,814 118,150 6 50 118,206 Debt instruments 103,554 1 6 103,561 108,903 6 6 108,915 Loans and advances 8,130 28 95 8,253 9,247 — 44 9,291 Central Banks — — — — — — — — Credit institutions — — — — — — — — Customers 8,130 28 95 8,253 9,247 — 44 9,291 Financial assets at amortised cost 927,729 66,964 32,045 1,026,738 884,892 66,170 30,670 981,732 Debt instruments 28,773 118 435 29,326 25,889 66 395 26,350 Loans and advances 898,956 66,846 31,610 997,412 859,003 66,104 30,275 955,382 Central Banks 13,548 — — 13,548 12,499 — — 12,499 Credit institutions 40,142 — — 40,142 37,845 — 1 37,846 Customers 845,266 66,846 31,610 943,722 808,659 66,104 30,274 905,037 Total 1,039,413 66,993 32,146 1,138,552 1,003,042 66,176 30,720 1,099,938
Schedule of regulatory capital	Capital ratio 30-06-2021 31-12-2020 Capital coefficients Level 1 ordinary eligible capital (million euros) 70,864 69,399 Level 1 additional eligible capital (million euros) 9,109 9,102 Level 2 eligible capital (million euros) 12,567 12,514 Risk-weighted assets (million euros) 584,999 562,580 Level 1 ordinary capital coefficient (CET 1) 12.11 % 12.34 % Level 1 additional capital coefficient (AT1) 1.56 % 1.61 % Level 1 capital coefficient (TIER1) 13.67 % 13.95 % Level 2 capital coefficient (TIER 2) 2.15 % 2.23 % Total capital coefficient 15.82 % 16.18 %
Schedule of leverage capital and ratios	Leverage 30-06-2021 31-12-2020 Leverage Tier 1 capital (million euros) 79,973 78,501 Exposure (million euros) 1,545,183 1,471,480 Leverage ratio 5.18 % 5.33 %
Real Estate Operations in Spain Segment
Credit risk
Schedule of exposure to risk	At 30 June 2021 and 31 December 2020 the financing amount related to construction and real estate business in Spain amounted t o EUR 2,701 million and EUR 2,801 million net of allowances, respectively. 30-06-2021 Million euros Gross Amount Excess over collateral value Specific allowance Financing for construction and property development recognised by the Group's credit institutions (including land) (business in Spain) 2,772 386 71 Of which: watchlist/ impaired 189 38 54 Memorandum items: Written-off assets 844 31-12-2020 Million euros Gross Amount Excess over collateral value Specific allowance Financing for construction and property development recognised by the Group's credit institutions (including land) (business in Spain) 2,871 397 70 Of which: watchlist/ impaired 176 20 58 Memorandum items: Written-off assets 924 30-06-2021 31-12-2020 Million euros Carrying amount Memorandum items: Total loans and advances to customers excluding the public sector (business in Spain) (book value) 239,941 237,165 Total consolidated assets (Total business) (book value) 1,568,636 1,508,250 Impairment losses and provision for exposure classified as normal (business in Spain) 1,560 1,591
Disclosure of concentrations	At the end 30 June 2021 and 31 December 2020 the concentration of this portfolio was as follows: Loans: gross amount Million euros 30-06-2021 31-12-2020 1. Without mortgage guarantee 183 164 2. With mortgage guarantee 2,589 2,707 2.1 Completed buildings 1,445 1,454 2.1.1 Residential 866 844 2.1.2 Other 579 610 2.2 Buildings and other constructions under construction 1,082 1,185 2.2.1 Residential 1,038 1,124 2.2.2 Other 44 61 2.3 Land 62 68 2.3.1 Developed consolidated land 41 44 2.3.2 Other land 21 24 Total 2,772 2,871
Foreclosed Properties
Credit risk
Schedule of exposure to risk	The following table shows the breakdown at 30 June 2021 and 31 December 2020 of the foreclosed assets for the Spanish business: 30-06-2021 Million euros Gross carrying amount Valuation Adjustments Of which: Impairment losses since time of the foreclosure Carrying amount Property assets arising from financing provided to construction and property development companies 6,649 3,490 2,517 3,159 Of which: Completed Buildings 2,075 823 625 1,252 Residential 554 182 131 372 Other 1,521 641 494 880 Buildings under construction 90 26 17 64 Residential 90 26 17 64 Other — — — — Land 4,484 2,641 1,875 1,843 Developed Land 1,578 850 522 728 Other land 2,906 1,791 1,353 1,115 Property assets from home purchase mortgage loans to households 884 304 201 580 Other foreclosed property assets 221 95 69 126 Total property assets 7,754 3,889 2,787 3,865 31-12-2020 Million euros Gross carrying amount Valuation Adjustments Of which: Impairment losses since time of the foreclosure Carrying amount Property assets arising from financing provided to construction and property development companies 6,810 3,568 2,563 3,242 Of which: Completed Buildings 2,140 846 644 1,294 Residential 527 171 130 356 Other 1,613 675 514 938 Buildings under construction 178 70 36 108 Residential 178 70 36 108 Other — — — — Land 4,492 2,652 1,883 1,840 Developed Land 1,656 888 559 768 Other land 2,836 1,764 1,324 1,072 Property assets from home purchase mortgage loans to households 892 305 200 587 Other foreclosed property assets 235 102 71 133 Total property assets 7,937 3,975 2,834 3,962
Home purchase loans
Credit risk
Schedule of exposure to risk	Home purchase loans granted to families in Spain on 30 June 2021 amounted to EUR 60,462 million (EUR 59,605 million at 31 December 2020). Of which mortgage guarantees are 99.35%. Million euros 30-06-2021 31-12-2020 Gross Amount Of which: Impaired Gross Amount Of which: Impaired Home purchase loans to families 60,462 1,827 59,605 1,850 - Without mortgage guarantee 396 82 387 75 - With mortgage guarantee 60,066 1,745 59,218 1,775
Home purchase loans | Spain
Credit risk
Disclosure of concentrations	30-06-2021 Gross amount in books on the amount of the last appraisal (loan to value) Million euros Less than or equal to 40% More than 40% or less than 60% More than 60% and less than 80% More than 80% and less or equal to 100% More than 100% TOTAL Gross amount 15,759 18,383 18,408 4,920 2,596 60,066 Of which: watchlist /impaired 170 218 304 307 746 1,745 31-12-2020 Gross amount in books on the amount of the last appraisal (loan to value) Million euros Less than or equal to 40% More than 40% or less than 60% More than 60% and less than 80% More than 80% and less or equal to 100% More than 100% TOTAL Gross amount 15,570 18,028 17,585 5,205 2,830 59,218 Of which: watchlist /impaired 170 222 318 305 760 1,775
Refinancing and restructured transactions
Credit risk
Schedule of exposure to risk	30-06-2021 Total Of which: Impaired Without real guarantee With real guarantee Without real guarantee With real guarantee Maximum amount of the actual collateral that can be considered Maximum amount of the actual collateral that can be considered Amounts in million euros, except number of transactions in units Number of transactions Gross amount Number of operations Gross amount Mortgage guarantee Other guarantees Impairment of accumulated value or accumulated losses in fair value due to credit risk Number of transactions Gross amount Number of operations Gross amount Mortgage guarantee Other guarantees Impairment of accumulated value or accumulated losses in fair value due to credit risk Credit entities — — — — — — — — — — — — — — Public sector 27 20 17 6 4 — 1 7 1 11 2 2 — 1 Other financial institutions and: individual shareholder 797 37 599 211 100 87 27 325 18 393 72 57 11 24 Non financial institutions and individual shareholder 221,539 10,579 49,625 10,036 6,320 1,217 4,668 100,297 3,737 34,456 6,367 3,997 425 4,188 Of which: Financing for constructions and property development 7,543 133 1,276 621 408 35 222 3,901 45 811 411 218 31 201 Other warehouses 2,902,894 4,397 433,415 10,825 6,335 2,925 3,668 1,420,116 1,825 135,971 3,812 2,703 311 2,263 Total 3,125,257 15,033 483,656 21,078 12,759 4,229 8,364 1,520,745 5,581 170,831 10,253 6,759 747 6,476 Financing classified as non-current assets and disposable groups of items that have been classified as held for sale — — — — — — — — — — — — — —

Additional disclosure require_2

Additional disclosure requirements (Tables)	6 Months Ended
	Jun. 30, 2021
Parent Company Financial Statements And Preference Shares And Preferred Securities [Abstract]
Condensed Balance Sheet	UNAUDITED CONDENSED BALANCE SHEETS 30 June 2021 31 December 2020 (Parent company only) (Millions of Euros) Assets Cash and due from banks 136,068 112,114 Of which: To bank subsidiaries 15,354 14,519 Trading account assets 75,734 81,433 Investment securities 39,518 29,477 Of which: To bank subsidiaries 7,697 13,603 To non-bank subsidiaries 13,242 3,399 Net Loans and leases 303,950 295,739 Of which: To non-bank subsidiaries 27,670 27,555 Investment in affiliated companies 86,631 84,890 Of which: To bank subsidiaries 66,035 60,186 To non-bank subsidiaries 20,596 24,703 Premises and equipment, net 6,469 6,680 Other assets 16,439 19,036 Total assets 664,809 629,369 Liabilities Deposits 404,072 383,135 Of which: To bank subsidiaries 17,378 17,045 To non-bank subsidiaries 31,649 19,949 Short-term debt 32,544 14,513 Long-term debt 86,560 83,981 Total debt 119,104 98,494 Of which: To bank subsidiaries 634 617 To non-bank subsidiaries 688 661 Other liabilities 76,873 82,803 Total liabilities 600,049 564,432 Stockholders' equity Capital stock 8,670 8,670 Retained earnings and other reserves 56,090 56,267 Total stockholders' equity 64,760 64,937 Total liabilities and Stockholders’ Equity 664,809 629,369
Condensed Income Statement	Following are the summarised unaudited statements of income of Banco Santander, S.A. for the periods ended 30 June 2021 and 2020. UNAUDITED CONDENSED STATEMENTS OF INCOME Six months ended Six months ended (Parent company only) 30 June 2021 30 June 2020 (Millions of Euros) Interest income Interest from earning assets 3,473 3,628 Dividends from affiliated companies 1,139 654 Of which: From bank subsidiaries 886 407 From non-bank subsidiaries 253 247 4,612 4,282 Interest expense (1,369) (1,763) Interest income / (Charges) 3,243 2,519 Provision for credit losses (916) (1,070) Interest income / (Charges) after provision for credit losses 2,327 1,449 Non-interest income: 2,134 2,058 Non-interest expense: (3,411) (8,571) Income before income taxes 1,050 (5,064) Income tax expense (147) (1,747) Net income 903 (6,811)
Condensed Statement of Comprehensive Income	Following are the summarised unaudited statements of comprehensive income of Banco Santander, S.A. for the periods ended 30 June 2021 and 2020. UNAUDITED CONDENSED STATEMENTS OF Six months ended Six months ended COMPREHENSIVE INCOME (Parent company only) 30 June 2021 30 June 2020 (Millions of Euros) NET INCOME 903 (6,811) OTHER COMPREHENSIVE INCOME (380) (829) Items that may be reclassified subsequently to profit or loss (115) (210) Hedging instruments (items not designated) — — Revaluation gains (losses) — — Amounts transferred to income statement — — Other reclassifications — — Debt instruments at fair value with changes in other comprehensive income (333) (199) Revaluation gains (losses) (192) 95 Amounts transferred to income statement (141) (294) Other reclassifications — — Cash flow hedges: 168 (104) Revaluation gains/(losses) 172 (126) Amounts transferred to income statement (4) 22 Amounts transferred to initial carrying amount of hedged items — — Other reclassifications — — Hedges of net investments in foreign operations: — — Exchange differences — — Non-current assets held for sale — — Income tax 50 93 Items that will not be reclassified to profit or loss: (265) (619) Actuarial gains/(losses) on pension plans 45 (42) Other recognised income and expense of investments in subsidiaries, joint ventures and associates — — Changes in the fair value of equity instruments measured at fair value through other comprehensive income (209) (688) Gains or losses resulting from the accounting for hedges of equity instruments measured at fair value through other comprehensive income, net — — Changes in the fair value of equity instruments measured at fair value through other comprehensive income (hedged item) 54 12 Changes in the fair value of equity instruments measured at fair value through other comprehensive income (hedging instrument) (54) (12) Changes in the fair value of financial liabilities at fair value through profit or loss attributable to changes in credit risk (116) 5 Income tax relating to items that will not be reclassified 15 106 TOTAL COMPREHENSIVE INCOME 523 (7,640)
Condensed Cash Flow Statement	Following are the summarised unaudited cash flow statements of Banco Santander, S.A. for the periods ended 30 June 2021 and 2020. UNAUDITED CONDENSED CASH FLOW STATEMENTS Six months ended Six months ended (Parent company only) 30 June 2021 30 June 2020 (Millions of Euros) 1. Cash flows from operating activities Consolidated profit 903 (6,811) Adjustments to profit 546 11,830 Net increase/decrease in operating assets (26,844) (63,984) Net increase/decrease in operating liabilities 33,777 83,119 Reimbursements/payments of income tax 349 942 Total net cash flows from operating activities (1) 8,731 25,096 2. Cash flows from investing activities Investments (-) (946) (1,874) Divestments (+) 3,597 497 Total net cash flows from investment activities (2) 2,651 (1,377) 3. Cash flows from financing activities Issuance of own equity instruments — — Disposal of own equity instruments 316 327 Acquisition of own equity instruments (316) (327) Issuance of debt securities 1,578 1,500 Redemption of debt securities (426) (1,914) Dividends paid (477) — Issuance/Redemption of equity instruments — — Other collections/payments related to financing activities (100) (162) Total net cash flows from financing activities (3) 575 (576) 4. Effect of exchange rate changes on cash and cash equivalents (4) 180 (253) 5. Net increase/decrease in cash and cash equivalents (1+2+3+4) 12,137 22,890 Cash and cash equivalents at beginning of period 67,561 32,471 Cash and cash equivalents at end of period 79,698 55,361
Schedule of preferred shares and securities	The following table shows the balance of the preference shares and preferred securities as of 30 June 2021 and 31 December 2020: 30 June 2021 31 December 2020 (Millions of Euros) Preference shares 205 196 Preferred securities 9,036 7,425 Total at period-end 9,241 7,621
Schedule of preferred shares and securities by issuer	Outstanding at 30 June 2021 Amount in Preference Shares currency Interest rate Redemption Issuer/Date of issue Currency (million) Option (A) Santander UK plc, October 1995 Pounds Sterling 80.3 10.375 % No option Santander UK plc, February 1996 Pounds Sterling 80.3 10.375 % No option Outstanding at 30 June 2021 Amount in Preferred Securities currency Interest rate Maturity date Issuer/Date of issue Currency (million) Banco Santander, S.A. Banco Santander, S.A., September 2014 Euro 1,500.0 6.25 % (B) Perpetuity Banco Santander, S.A., April 2017 Euro 750.0 6.75 % (C) Perpetuity Banco Santander, S.A., September 2017 Euro 1,000.0 5.25 % (D) Perpetuity Banco Santander, S.A., March 2018 Euro 1,500.0 4.75 % (E) Perpetuity Banco Santander, S.A., February 2019 US Dollar 1,200.0 7.50 % (F) Perpetuity Banco Santander, S.A., January 2020 Euro 1,500.0 4.375 % (G) Perpetuity Banco Santander, S.A., May 2021 US Dollar 1,000.0 4.75 % (H) Perpetuity Banco Santander, S.A., May 2021 Euro 750.0 4.125 % (I) Perpetuity Santander Finance Preferred, S.A. (Unipersonal), September 2004 Euro 144.0 €CMS 10 +0.05% subject to a maximum distribution of 8% per annum Perpetuity Santander Finance Preferred, S.A. (Unipersonal), July 2007 Pounds Sterling 4.9 7.01 % Perpetuity A. From these dates the issuer can redeem the shares, subject to prior authorization by the national supervisor. B. Payment is subject to certain conditions and to the discretion of Banco Santander. The 6.25% interest rate is set for the first seven years. After that, it will be reviewed by applying a margin of 564 basis points on the 5-year Mid-Swap Rate. C. Payment is subject to certain conditions and to the discretion of Banco Santander. The 6.75% interest rate is set for the first five years. After that, it will be reviewed by applying a margin of 680.3 basis points on the 5-year Mid-Swap Rate. D. Payment is subject to certain conditions and to the discretion of Banco Santander. The 5.25% interest rate is set for the first six years. After that, it will be reviewed by applying a margin of 499.9 basis points on the 5-year Mid-Swap Rate. E. Payment is subject to certain conditions and to the discretion of Banco Santander. The 4.75% interest rate is set for the first seven years. After that, it will be reviewed every 5 years applying a margin of 409.7 basis points on the 5-year Mid-Swap Rate. F. Payment is subject to certain conditions and to the discretion of Banco Santander. The 7.50% interest rate is set for the first seven years. After that, it will be reviewed every 5 years by applying a margin of 489.9 basis points on the 5-year Mid-Swap Rate. G. Payment is subject to certain conditions and to the discretion of Banco Santander. The 4.375% interest rate is set for the first six years. After that, it will be reviewed every 5 years by applying a margin of 453.4 basis points on the 5-year Mid-Swap Rate. H. Payment is subject to certain conditions and to the discretion of Banco Santander. The 4.750% interest rate is set for the first six years, revised every 5 years thereafter by applying a margin of 375.3 basis points over the 5-year UST rate (5-year UST). I. Payment is subject to certain conditions and to the discretion of Banco Santander. The 4.125% interest rate is set for the first seven years, revised every 5 years thereafter by applying a margin of 431.1 basis points over the applicable 5-year Euro mid-swap.

Introduction, basis of presen_3

Introduction, basis of presentation of the interim condensed consolidated financial statements and other information - Use of critical estimates (Details) € in Millions	6 Months Ended
	Jun. 30, 2021EUR (€)
Market Risk Evaluated Using Value at Risk Metric
Disclosure of other provisions [line items]
Value at risk	€ 8.7
VaR confidence level percentage	99.00%
Credit risk
Disclosure of other provisions [line items]
Amount of moratorium granted	€ 104,300
Moratorium granted (in percentage)	92.00%
Moratoria granted, expired, amount	€ 96,000
Moratoria granted, not expired, amount	8,700
Moratoria granted, maturing next quarter, amount	€ 7,500
Credit risk | Financial instruments credit-impaired
Disclosure of other provisions [line items]
Moratorium expired (in percentage)	5.00%
UK | Credit risk | Residential Mortgage
Disclosure of other provisions [line items]
Amount of moratorium granted (in percentage)	66.00%
Average Loan-to-value (LTV) ratio (in percentage)	50.00%
Consumer loan | Cars
Disclosure of other provisions [line items]
Amount of moratorium granted	€ 16,400
Moratorium granted (in percentage)	16.00%

Introduction, basis of presen_4

Introduction, basis of presentation of the interim condensed consolidated financial statements and other information - Comparative information (Details)	6 Months Ended
	Jun. 30, 2021
MXN
Disclosure of initial application of standards or interpretations [line items]
Change in foreign currency exchange rate (as a percent)	3.61%
Change in average foreign currency exchange rate (as a percent)	(2.93%)
USD
Disclosure of initial application of standards or interpretations [line items]
Change in foreign currency exchange rate (as a percent)	3.45%
Change in average foreign currency exchange rate (as a percent)	(8.57%)
BRL
Disclosure of initial application of standards or interpretations [line items]
Change in foreign currency exchange rate (as a percent)	7.28%
Change in average foreign currency exchange rate (as a percent)	(17.51%)
Argentine peso
Disclosure of initial application of standards or interpretations [line items]
Change in foreign currency exchange rate (as a percent)	(9.14%)
Change in average foreign currency exchange rate (as a percent)	(35.51%)
GBP
Disclosure of initial application of standards or interpretations [line items]
Change in foreign currency exchange rate (as a percent)	4.63%
Change in average foreign currency exchange rate (as a percent)	0.74%
Chilean peso
Disclosure of initial application of standards or interpretations [line items]
Change in foreign currency exchange rate (as a percent)	1.00%
Change in average foreign currency exchange rate (as a percent)	3.11%
Polish zloty
Disclosure of initial application of standards or interpretations [line items]
Change in foreign currency exchange rate (as a percent)	0.90%
Change in average foreign currency exchange rate (as a percent)	(2.80%)

Introduction, basis of presen_5

Introduction, basis of presentation of the interim condensed consolidated financial statements and other information - Events after reporting period (Details) € / shares in Units, $ / shares in Units, € in Millions, $ in Millions	Jul. 15, 2021USD ($)	Jul. 15, 2021EUR (€)	Jul. 02, 2021USD ($)$ / shares	Jul. 02, 2021EUR (€)	Mar. 26, 2021$ / shares	Mar. 26, 2021€ / shares
Disclosure of detailed information about business combination [line items]
Expected consideration (in usd per share) | (per share)					$ 24	€ 1
Santander Holding USA, Inc. | Santander Consumer USA | Major business combination
Disclosure of detailed information about business combination [line items]
Expected cash consideration to be paid			$ 2,358	€ 2,000
Santander Holding USA, Inc. | Pierpoint Capital Holding LLC | Major business combination
Disclosure of detailed information about business combination [line items]
Expected cash consideration to be paid	$ 600	€ 500
Santander Consumer USA | Santander Holding USA, Inc. | Major business combination
Disclosure of detailed information about business combination [line items]
Expected consideration (in usd per share)			$ 39
Proportion of ownership interest in subsidiary (in percentage)			80.00%	80.00%

Grupo Santander - Acquisition o

Grupo Santander - Acquisition of Banco Santander Mexico (Details) € / shares in Units, $ / shares in Units, € in Millions, $ in Millions	Mar. 26, 2021MXN ($)$ / shares	Mar. 26, 2021EUR (€)	Apr. 12, 2019	Mar. 26, 2021€ / shares
Disclosure of detailed information about business combination [line items]
Expected consideration | (per share)	$ 24			€ 1
Banco Santander (Mexico), S.A., Institucion De Banca Multiple, Grupo Financiero Santander Mexico
Disclosure of detailed information about business combination [line items]
Percentage of ownership interest not held by entity	8.30%			8.30%
Percentage of voting interests for which approval is no longer required	95.00%			95.00%
Share capital contributed (as a percent)			8.30%
Expected increase in capital	$ 13,190	€ 550

Shareholder remuneration syst_3

Shareholder remuneration system and earnings per share - Distributions (Details) - EUR (€) € / shares in Units, € in Millions	1 Months Ended	6 Months Ended
	May 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Shareholder remuneration system and earnings per share
Dividends paid, % of par value		5.50%	0.00%
Dividends paid, other shares, % of par value		0.00%	0.00%
Dividends paid, ordinary and other shares, % of par value		5.50%	0.00%
Dividends paid out of profit, % of par value		0.00%	0.00%
Dividends paid with a charge to reserves or share premium, % of par value		5.50%	0.00%
Dividend in kind, % of par value		0.00%	0.00%
Flexible payment, % of par value		0.00%	0.00%
Total remuneration paid (eur per share)		€ 0.0275	€ 0
Dividends paid, other shares (eur per share)		0	0
Dividends paid, ordinary and other shares (eur per share)		0.0275	0
Dividends paid out of profit (eur per share)		0	0
Dividends paid with a charge to reserves or share premium (eur per share)		0.0275	0
Dividend in kind (eur per share)		0	0
Flexible payment (eur per share)		€ 0	€ 0
Dividends paid, ordinary shares		€ 477	€ 0
Dividends paid, other shares		0	0
Dividends paid, ordinary and other shares		477	0
Dividends paid out of profit		0	0
Dividends paid with a charge to reserves or share premium		477	0
Dividend in kind		0	0
Flexible payment		0	0
Total dividend equivalent (in eur per share)	€ 2.75
Dividends recognised as distributions to owners		€ 824	€ 279

Shareholder remuneration syst_4

Shareholder remuneration system and earnings per share - EPS Basic (Details) - EUR (€) € / shares in Units, € in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Basic earnings per share [abstract]
Profit attributable to the Parent (EUR million)	€ 3,675	€ (10,798)
Remuneration of contingently convertible preference shares (CCP) (million euros)	(271)	(278)
Net profit for the year	3,404	(11,076)
Profit or Loss from discontinued operations (non-controlling interest net) (million euros)	0	0
Profit or Loss from continuing operations (net of non-controlling interests and CCP) (million euros)	€ 3,404	€ (11,076)
Weighted average number of shares outstanding (in shares)	17,309,951,841	16,598,649,355
Impact factor correction (a)		721,680,407
Adjusted weighted average number of ordinary shares outstanding (in shares)	17,309,951,841	17,320,329,762
Basic (in eur per share)	€ 0.20	€ (0.64)
Of which: from discontinued operations (eur per share)	0	0
from continuing operations (eur per share)	€ 0.20	€ (0.64)

Shareholder remuneration syst_5

Shareholder remuneration system and earnings per share - EPS Diluted (Details) - EUR (€) € / shares in Units, € in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Diluted earnings per share [abstract]
Profit/(loss) attributable to the parent	€ 3,675	€ (10,798)
Remuneration of contingently convertible preference shares (CCP) (million euros)	(271)	(278)
Profit attributable to ordinary equity holders of parent including dilutive effects	3,404	(11,076)
Profit or Loss from discontinued operations (non-controlling interest net) (million euros)	0	0
Profit or Loss from continuing operations (net of non-controlling interests and CCP) (million euros)	€ 3,404	€ (11,076)
Weighted average number of shares outstanding (in shares)	17,309,951,841	16,598,649,355
Dilutive effect of options/rights on shares (in shares)	48,815,931
Impact factor correction (a)		721,680,407
Adjusted number of shares (in shares)	17,358,767,772	17,320,329,762
Total diluted earnings (loss) per share (eur per share)	€ 0.20	€ (0.64)
Diluted earnings per share from discontinued operations (eur per share)	0	0
Diluted earnings per share from continuing operations (eur per share)	€ 0.20	€ (0.64)

Remuneration and other benefi_3

Remuneration and other benefits paid to the Bank's directors and senior managers (Details) € in Thousands	6 Months Ended
	Jun. 30, 2021EUR (€)numberOfEmployeesemployee	Jun. 30, 2020EUR (€)employeenumberOfEmployees
Remuneration of key personnel
Transactions with shares and/or other financial instruments	€ 0	€ 0
Number of persons | numberOfEmployees	190,490,000	195,161,000
Bank's Directors
Remuneration of key personnel
Fixed salary	€ 3,234	€ 2,859
Variable salary	0	0
Directors' fees	590	605
Annual emoluments	1,857	1,637
Other remuneration	1,236	1,416
Sub-total from executive functions	6,917	6,517
Total remuneration	6,917	6,517
Advances	0	0
Contributions to plan	912	1,010
Pension rights	68,317	79,015
Contribution to insurance policies	677	896
Guarantees provided for directors	0	0
Former directors of the bank
Remuneration of key personnel
Pension rights	50,107	56,778
Current senior managers
Remuneration of key personnel
Sub-total from executive functions	14,014	15,275
Contributions to plan	2,917	2,987
Pension rights	€ 57,372	€ 55,229
Number of persons | employee	16	17
Retired senior managers
Remuneration of key personnel
Pension rights	€ 132,597	€ 160,278
Remunerations received by members of senior management who ceased in their functions	2,690	2,822
Remunerations received as endowments and/or contributions to pension funds by members of the senior management who ceased in their functions	195	178
Loan commitments granted | Bank's Directors
Remuneration of key personnel
Total direct risk exposure	€ 73	€ 34

Financial assets (Details)

Financial assets (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instruments
FINANCIAL ASSETS HELD FOR TRADING	€ 102,792	€ 114,945
Non-trading financial assets mandatorily at fair value through profit or loss	4,838	4,486
FINANCIAL ASSETS DESIGNATED AT FAIR VALUE THROUGH PROFIT OR LOSS	56,486	48,717
Financial assets at fair value through comprehensive income	114,505	120,953
Financial assets at amortised cost	1,003,417	958,378
Derivatives
Debt Instruments
FINANCIAL ASSETS HELD FOR TRADING	54,867	67,137
Equity instruments
Debt Instruments
FINANCIAL ASSETS HELD FOR TRADING	13,545	9,615
Non-trading financial assets mandatorily at fair value through profit or loss	3,607	3,234
Financial assets at fair value through comprehensive income	2,751	2,783
Debt instruments asset
Debt Instruments
FINANCIAL ASSETS HELD FOR TRADING	34,114	37,894
Non-trading financial assets mandatorily at fair value through profit or loss	810	700
FINANCIAL ASSETS DESIGNATED AT FAIR VALUE THROUGH PROFIT OR LOSS	2,763	2,979
Financial assets at fair value through comprehensive income	103,549	108,903
Financial assets at amortised cost	29,038	26,078
Loans and advances
Debt Instruments
FINANCIAL ASSETS HELD FOR TRADING	265	299
Non-trading financial assets mandatorily at fair value through profit or loss	421	552
FINANCIAL ASSETS DESIGNATED AT FAIR VALUE THROUGH PROFIT OR LOSS	53,723	45,738
Financial assets at fair value through comprehensive income	8,205	9,267
Financial assets at amortised cost	974,379	932,300
Loans and advances - Central banks
Debt Instruments
FINANCIAL ASSETS HELD FOR TRADING	0	0
Non-trading financial assets mandatorily at fair value through profit or loss	0	0
FINANCIAL ASSETS DESIGNATED AT FAIR VALUE THROUGH PROFIT OR LOSS	4,881	9,481
Financial assets at fair value through comprehensive income	0	0
Financial assets at amortised cost	13,548	12,499
Loans and advances - Credit institutions
Debt Instruments
FINANCIAL ASSETS HELD FOR TRADING	0	3
Non-trading financial assets mandatorily at fair value through profit or loss	0	0
FINANCIAL ASSETS DESIGNATED AT FAIR VALUE THROUGH PROFIT OR LOSS	23,910	12,136
Financial assets at fair value through comprehensive income	0	0
Financial assets at amortised cost	40,136	37,838
Loans and advances - Customers
Debt Instruments
FINANCIAL ASSETS HELD FOR TRADING	265	296
Non-trading financial assets mandatorily at fair value through profit or loss	421	552
FINANCIAL ASSETS DESIGNATED AT FAIR VALUE THROUGH PROFIT OR LOSS	24,932	24,121
Financial assets at fair value through comprehensive income	8,205	9,267
Financial assets at amortised cost	€ 920,695	€ 881,963

Financial assets - Gross exposu

Financial assets - Gross exposure by stages of impairment (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	€ 1,138,552	€ 1,099,938
Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	32,146	30,720
Financial instruments not credit-impaired | Next 12 months
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	1,039,413	1,003,042
Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	66,993	66,176
Financial instruments purchased credit impaired
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	502	497
Financial instruments purchased credit impaired | Business Combinations Carried Out
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	431
Financial assets at fair value through other comprehensive income
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	111,814	118,206
Financial assets at fair value through other comprehensive income | Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	101	50
Financial assets at fair value through other comprehensive income | Financial instruments not credit-impaired | Next 12 months
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	111,684	118,150
Financial assets at fair value through other comprehensive income | Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	29	6
Financial assets at fair value through other comprehensive income | Debt instruments asset
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	103,561	108,915
Financial assets at fair value through other comprehensive income | Debt instruments asset | Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	6	6
Financial assets at fair value through other comprehensive income | Debt instruments asset | Financial instruments not credit-impaired | Next 12 months
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	103,554	108,903
Financial assets at fair value through other comprehensive income | Debt instruments asset | Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	1	6
Financial assets at fair value through other comprehensive income | Loans and advances
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	8,253	9,291
Financial assets at fair value through other comprehensive income | Loans and advances | Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	95	44
Financial assets at fair value through other comprehensive income | Loans and advances | Financial instruments not credit-impaired | Next 12 months
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	8,130	9,247
Financial assets at fair value through other comprehensive income | Loans and advances | Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	28	0
Financial assets at fair value through other comprehensive income | Loans and advances - Central banks
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	0	0
Financial assets at fair value through other comprehensive income | Loans and advances - Central banks | Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	0	0
Financial assets at fair value through other comprehensive income | Loans and advances - Central banks | Financial instruments not credit-impaired | Next 12 months
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	0	0
Financial assets at fair value through other comprehensive income | Loans and advances - Central banks | Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	0	0
Financial assets at fair value through other comprehensive income | Loans and advances - Credit institutions
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	0	0
Financial assets at fair value through other comprehensive income | Loans and advances - Credit institutions | Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	0	0
Financial assets at fair value through other comprehensive income | Loans and advances - Credit institutions | Financial instruments not credit-impaired | Next 12 months
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	0	0
Financial assets at fair value through other comprehensive income | Loans and advances - Credit institutions | Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	0	0
Financial assets at fair value through other comprehensive income | Loans and advances - Customers
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	8,253	9,291
Financial assets at fair value through other comprehensive income | Loans and advances - Customers | Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	95	44
Financial assets at fair value through other comprehensive income | Loans and advances - Customers | Financial instruments not credit-impaired | Next 12 months
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	8,130	9,247
Financial assets at fair value through other comprehensive income | Loans and advances - Customers | Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	28	0
Financial assets at amortised cost
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	1,026,738	981,732
Financial assets at amortised cost | Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	32,045	30,670
Financial assets at amortised cost | Financial instruments not credit-impaired | Next 12 months
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	927,729	884,892
Financial assets at amortised cost | Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	66,964	66,170
Financial assets at amortised cost | Debt instruments asset
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	29,326	26,350
Financial assets at amortised cost | Debt instruments asset | Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	435	395
Financial assets at amortised cost | Debt instruments asset | Financial instruments not credit-impaired | Next 12 months
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	28,773	25,889
Financial assets at amortised cost | Debt instruments asset | Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	118	66
Financial assets at amortised cost | Loans and advances
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	997,412	955,382
Financial assets at amortised cost | Loans and advances | Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	31,610	30,275
Financial assets at amortised cost | Loans and advances | Financial instruments not credit-impaired | Next 12 months
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	898,956	859,003
Financial assets at amortised cost | Loans and advances | Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	66,846	66,104
Financial assets at amortised cost | Loans and advances - Central banks
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	13,548	12,499
Financial assets at amortised cost | Loans and advances - Central banks | Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	0	0
Financial assets at amortised cost | Loans and advances - Central banks | Financial instruments not credit-impaired | Next 12 months
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	13,548	12,499
Financial assets at amortised cost | Loans and advances - Central banks | Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	0	0
Financial assets at amortised cost | Loans and advances - Credit institutions
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	40,142	37,846
Financial assets at amortised cost | Loans and advances - Credit institutions | Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	0	1
Financial assets at amortised cost | Loans and advances - Credit institutions | Financial instruments not credit-impaired | Next 12 months
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	40,142	37,845
Financial assets at amortised cost | Loans and advances - Credit institutions | Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	0	0
Financial assets at amortised cost | Loans and advances - Customers
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	943,722	905,037
Financial assets at amortised cost | Loans and advances - Customers | Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	31,610	30,274
Financial assets at amortised cost | Loans and advances - Customers | Financial instruments not credit-impaired | Next 12 months
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	845,266	808,659
Financial assets at amortised cost | Loans and advances - Customers | Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Maximum exposure to credit risk	€ 66,846	€ 66,104

Financial assets - Movement in

Financial assets - Movement in provisions that cover impairment losses (Details) - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Disclosure of reconciliation of changes in loss allowance of financial instruments
Impairment loss (reversal)	€ 3,804	€ 7,030
Financial assets at amortised cost
Disclosure of reconciliation of changes in loss allowance of financial instruments
Net impairment losses charged to income for the period	4,384	7,441
Impairment losses charged to income	9,778	12,616
Impairment losses reversed with a credit to income	(5,394)	(5,175)
Write-off of impaired assets against recorded allowance	(4,353)	(5,183)
Exchange differences and other	(57)	(1,716)
Previously written-off assets recovered	599	543
Impairment loss (reversal)	3,785	7,027
Impairment losses (preIFRS9)		7,027
Financial assets at amortised cost | Accumulated impairment
Disclosure of reconciliation of changes in loss allowance of financial instruments
Provision to cover losses due to impairment of financial assets at beginning of year	23,823	23,255	€ 23,849	€ 22,713
Provision to cover losses due to impairment of financial assets at end of year	23,823	23,255	€ 23,849	€ 22,713
Financial instruments credit-impaired | Financial assets at amortised cost | Accumulated impairment
Disclosure of reconciliation of changes in loss allowance of financial instruments
Provision to cover losses due to impairment of financial assets at beginning of year	14,101	13,571
Provision to cover losses due to impairment of financial assets at end of year	14,101	13,571
Financial instruments not credit-impaired | Financial assets at amortised cost | Accumulated impairment
Disclosure of reconciliation of changes in loss allowance of financial instruments
Provision to cover losses due to impairment of financial assets at beginning of year	9,722	9,684
Provision to cover losses due to impairment of financial assets at end of year	9,722	9,684
Expected credit losses individually assessed | Financial assets at amortised cost | Accumulated impairment
Disclosure of reconciliation of changes in loss allowance of financial instruments
Provision to cover losses due to impairment of financial assets at beginning of year	3,077	3,358
Provision to cover losses due to impairment of financial assets at end of year	3,077	3,358
Expected credit losses collectively assessed | Financial assets at amortised cost | Accumulated impairment
Disclosure of reconciliation of changes in loss allowance of financial instruments
Provision to cover losses due to impairment of financial assets at beginning of year	20,746	19,897
Provision to cover losses due to impairment of financial assets at end of year	€ 20,746	€ 19,897

Financial assets - Movement of

Financial assets - Movement of loss provision by impairment stage (Details) - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disclosure of reconciliation of changes in loss allowance of financial instruments
Impairment loss (reversal)	€ 3,804	€ 7,030
Financial assets at amortised cost
Disclosure of reconciliation of changes in loss allowance of financial instruments
Write-offs	4,353	5,183
Exchange differences and other	(57)	(1,716)
Previously written-off assets recovered	599	543
Loss due to contract renegotiation and modification		129
Impairment loss (reversal)	3,785	7,027
Impairment losses (preIFRS9)		7,027
Financial assets at amortised cost | Accumulated impairment
Disclosure of reconciliation of changes in loss allowance of financial instruments
Impairment at beginning of year	23,849	22,713
Impairment at end of year	23,823	23,255
Financial assets at amortised cost | Financial instruments not credit-impaired | Accumulated impairment
Disclosure of reconciliation of changes in loss allowance of financial instruments
Impairment at end of year	9,722	9,684
Financial assets at amortised cost | Financial instruments credit-impaired | Accumulated impairment
Disclosure of reconciliation of changes in loss allowance of financial instruments
Impairment at end of year	14,101	13,571
Financial assets at amortised cost | Loans and advances - Customers | Accumulated impairment
Disclosure of reconciliation of changes in loss allowance of financial instruments
Impairment at beginning of year	23,571	22,242
Transfers between stages	2,546	2,594
Variation due to credit risk	1,838	4,912
Write-offs	(4,353)	(5,057)
Exchange differences and other	(73)	(1,716)
Impairment at end of year	23,529	22,975
Financial assets at amortised cost | Loans and advances - Customers | Financial instruments not credit-impaired | Accumulated impairment | Next 12 months
Disclosure of reconciliation of changes in loss allowance of financial instruments
Impairment at beginning of year	4,252	3,835
Transfers between stages	(474)	(722)
Variation due to credit risk	473	2,328
Write-offs	0	0
Exchange differences and other	(104)	(333)
Impairment at end of year	4,147	5,108
Financial assets at amortised cost | Loans and advances - Customers | Financial instruments not credit-impaired | Accumulated impairment | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Impairment at beginning of year	5,672	4,474
Transfers between stages	747	694
Variation due to credit risk	(904)	(327)
Write-offs	0	0
Exchange differences and other	33	(290)
Impairment at end of year	5,548	4,551
Financial assets at amortised cost | Loans and advances - Customers | Financial instruments credit-impaired | Accumulated impairment | Lifetime Expected Credit Losses
Disclosure of reconciliation of changes in loss allowance of financial instruments
Impairment at beginning of year	13,647	13,933
Transfers between stages	2,273	2,622
Variation due to credit risk	2,269	2,911
Write-offs	(4,353)	(5,057)
Exchange differences and other	(2)	(1,093)
Impairment at end of year	€ 13,834	€ 13,316

Financial assets - Impaired ass

Financial assets - Impaired assets (Details) - Financial assets at amortised cost - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disclosure of reconciliation of changes in loss allowance of financial instruments
Written-off assets	€ (4,353)	€ (5,183)
Exchange differences and other	57	1,716
Gross carrying amount | Financial instruments credit-impaired
Disclosure of reconciliation of changes in loss allowance of financial instruments
Financial assets at beginning of period	31,168	33,184
Additions	4,842	5,586
Written-off assets	(4,353)	(5,183)
Exchange differences and other	819	(1,407)
Financial assets at end of period	€ 32,476	€ 32,180

Financial assets - Guarantees r

Financial assets - Guarantees received (Details) - Financial assets at amortised cost - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of financial assets that are either past due or impaired [line items]
Real guarantees value	€ 574,360	€ 537,216
Other guarantees	85,342	82,314
Total value of guarantees received	659,702	619,530
Impaired | Financial instruments credit-impaired
Disclosure of financial assets that are either past due or impaired [line items]
Real guarantees value	12,239	12,106
Other guarantees	€ 1,751	€ 1,253

Financial assets - Fair value o

Financial assets - Fair value of financial assets not at fair value (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Carrying amount
Disclosure of fair value measurement of assets [line items]
Financial assets	€ 1,003,417	€ 958,378
Not measured at fair value in statement of financial position but for which fair value is disclosed
Disclosure of fair value measurement of assets [line items]
Financial assets, at fair value	1,010,496	966,790
Loans and advances | Carrying amount
Disclosure of fair value measurement of assets [line items]
Financial assets	974,379	932,300
Loans and advances | Not measured at fair value in statement of financial position but for which fair value is disclosed
Disclosure of fair value measurement of assets [line items]
Financial assets, at fair value	981,129	940,258
Debt instruments asset | Carrying amount
Disclosure of fair value measurement of assets [line items]
Financial assets	29,038	26,078
Debt instruments asset | Not measured at fair value in statement of financial position but for which fair value is disclosed
Disclosure of fair value measurement of assets [line items]
Financial assets, at fair value	€ 29,367	€ 26,532

Non-current assets held for s_3

Non-current assets held for sale (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Gains Or Losses On Assets Held For Sale [Line Items]
Tangible assets	€ 32,678	€ 32,735
Other assets	9,889	11,070
Total non-current assets held for sale	5,077	4,445
Non-current assets held for sale
Gains Or Losses On Assets Held For Sale [Line Items]
Tangible assets	4,369	4,445
Other assets	708	0
Total non-current assets held for sale	5,077	4,445
Non-current assets held for sale | Foreclosed assets
Gains Or Losses On Assets Held For Sale [Line Items]
Tangible assets	3,963	4,081
Non-current assets held for sale | Other Tangible Assets
Gains Or Losses On Assets Held For Sale [Line Items]
Tangible assets	406	364
Non-current assets held for sale | Spain | Foreclosed assets
Gains Or Losses On Assets Held For Sale [Line Items]
Tangible assets	€ 3,370	€ 3,485

Non-current assets held for s_4

Non-current assets held for sale- Allowances and other information (Details) - Non-current assets held for sale - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Gains Or Losses On Assets Held For Sale [Line Items]
Allowances recognized for non-current assets (as percentage)	47.40%		48.00%
Net charges recorded against valuation allowances	€ 84	€ 167
Recoveries	€ 17	€ 19

Tangible asset (Details)

Tangible asset (Details) - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Property, plant and equipment [abstract]
Acquisitions, property, plant and equipment	€ 3,363	€ 2,538
Disposals, property, plant and equipment	1,621	848
Gains (losses) on disposals of property, plant and equipment	52	€ 27
Right-of-use assets	2,784		€ 2,837
Impairment loss recognised in profit or loss, property, plant and equipment	€ 125

Intangible assets - Detail of I

Intangible assets - Detail of Intangible Assets - Goodwill (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of information for cash-generating units [line items]
Goodwill	€ 12,854	€ 12,471
Banco Santander (Brazil)
Disclosure of information for cash-generating units [line items]
Goodwill	3,386	3,109
SAM Investment Holdings Limited
Disclosure of information for cash-generating units [line items]
Goodwill	1,444	1,444
Santander Consumer Germany
Disclosure of information for cash-generating units [line items]
Goodwill	1,314	1,314
Santander Bank Polska
Disclosure of information for cash-generating units [line items]
Goodwill	1,114	1,104
Santander Portugal
Disclosure of information for cash-generating units [line items]
Goodwill	1,040	1,040
Santander España
Disclosure of information for cash-generating units [line items]
Goodwill	1,027	1,027
Santander Consumer USA
Disclosure of information for cash-generating units [line items]
Goodwill	935	904
Santander Bank National Association
Disclosure of information for cash-generating units [line items]
Goodwill	619	592
Santander UK
Disclosure of information for cash-generating units [line items]
Goodwill	614	594
Banco Santander Chile
Disclosure of information for cash-generating units [line items]
Goodwill	577	571
Grupo Financiero Santander (Mexico)
Disclosure of information for cash-generating units [line items]
Goodwill	414	399
Santander Consumer Nordics
Disclosure of information for cash-generating units [line items]
Goodwill	220	216
Other entities
Disclosure of information for cash-generating units [line items]
Goodwill	€ 150	€ 157

Intangible assets - Schedule of

Intangible assets - Schedule of Changes in Goodwill (Details) - EUR (€) € in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2021
Disclosure of detailed information about intangible assets [abstract]
Increase in goodwill due to exchange differences and other items		€ 383
Impairment loss recognised in profit or loss, goodwill	€ 10,100

Financial liabilities - Summary

Financial liabilities - Summary and Movement (Details) - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Disclosure of financial liabilities [line items]
Financial liabilities held for trading	€ 68,982		€ 81,167
Financial liabilities designated at fair value through profit or loss	54,131		48,038
FINANCIAL LIABILITIES AT AMORTISED COST	1,310,433		1,248,188
Changes in financial instruments, Liabilities
Perimeter	27
Derivatives
Disclosure of financial liabilities [line items]
Financial liabilities held for trading	52,440		64,469
Short positions
Disclosure of financial liabilities [line items]
Financial liabilities held for trading	16,542		16,698
Deposits
Disclosure of financial liabilities [line items]
Financial liabilities held for trading	0		0
Financial liabilities designated at fair value through profit or loss	48,640		43,598
FINANCIAL LIABILITIES AT AMORTISED COST	1,038,892		990,391
Deposits - Central banks
Disclosure of financial liabilities [line items]
Financial liabilities held for trading	0		0
Financial liabilities designated at fair value through profit or loss	3,189		2,490
FINANCIAL LIABILITIES AT AMORTISED COST	124,947		112,804
Deposits - Credit institutions
Disclosure of financial liabilities [line items]
Financial liabilities held for trading	0		0
Financial liabilities designated at fair value through profit or loss	7,446		6,765
FINANCIAL LIABILITIES AT AMORTISED COST	57,823		62,620
Deposits - Customers
Disclosure of financial liabilities [line items]
Financial liabilities held for trading	0		0
Financial liabilities designated at fair value through profit or loss	38,005		34,343
FINANCIAL LIABILITIES AT AMORTISED COST	856,122		814,967
Debt instruments liability
Disclosure of financial liabilities [line items]
Financial liabilities held for trading	0		0
Financial liabilities designated at fair value through profit or loss	5,491		4,440
FINANCIAL LIABILITIES AT AMORTISED COST	237,739		230,829
Financial liabilities	243,230		235,269
Changes in financial instruments, Liabilities
Balance at beginning of year	235,269
Balance at year-end	243,230
Other financial liabilities
Disclosure of financial liabilities [line items]
Financial liabilities held for trading	0		0
Financial liabilities designated at fair value through profit or loss	0		0
FINANCIAL LIABILITIES AT AMORTISED COST	33,802		26,968
Bonds And Debentures And Subordinated Liabilities
Disclosure of financial liabilities [line items]
Financial liabilities	218,243	€ 226,718	213,263
Changes in financial instruments, Liabilities
Balance at beginning of year	213,263	229,333
Perimeter	0	0
Issues	34,993	40,962
Repurchases or redemptions	(32,496)	(38,364)
Exchange rate and other adjustments	2,483	(5,213)
Balance at year-end	218,243	226,718
Bonds And Debentures
Disclosure of financial liabilities [line items]
Financial liabilities	194,860	206,241	191,577
Changes in financial instruments, Liabilities
Balance at beginning of year	191,577	208,455
Perimeter	0	0
Issues	33,415	39,109
Repurchases or redemptions	(32,496)	(36,749)
Exchange rate and other adjustments	2,364	(4,574)
Balance at year-end	194,860	206,241
Bonds And Debentures | Debt instruments liability
Disclosure of financial liabilities [line items]
Financial liabilities	194,860		191,577
Changes in financial instruments, Liabilities
Balance at beginning of year	191,577
Balance at year-end	194,860
Subordinated liabilities
Disclosure of financial liabilities [line items]
Financial liabilities	23,383	20,477	21,686
Changes in financial instruments, Liabilities
Balance at beginning of year	21,686	20,878
Perimeter	0	0
Issues	1,578	1,853
Repurchases or redemptions	0	(1,615)
Exchange rate and other adjustments	119	(639)
Balance at year-end	23,383	€ 20,477
Subordinated liabilities | Debt instruments liability
Disclosure of financial liabilities [line items]
Financial liabilities	23,383		21,686
Changes in financial instruments, Liabilities
Balance at beginning of year	21,686
Balance at year-end	23,383
Promissory Notes and Other Securities | Debt instruments liability
Disclosure of financial liabilities [line items]
Financial liabilities	24,987		€ 22,006
Changes in financial instruments, Liabilities
Balance at beginning of year	22,006
Balance at year-end	€ 24,987

Financial liabilities - Prefere

Financial liabilities - Preference shares (Details) € in Millions, $ in Millions	1 Months Ended		6 Months Ended
	May 31, 2021EUR (€)	Jan. 31, 2020EUR (€)	Jun. 30, 2021	May 31, 2021USD ($)	Mar. 12, 2020EUR (€)
Issuance By Banco Santander S.A. in March 2020
Disclosure of detailed information about financial instruments [line items]
Notional amount					€ 1,500
Issuance By Banco Santander S.A. in January 2020
Disclosure of detailed information about financial instruments [line items]
Interest rate (as a percent)			4.375%
Initial interest rate term			6 years
Reprice term			5 years
Adjustment to reference rate, after initial interest rate period			4.534%
Reference rate			5-year Mid-Swap Rate
Issuance By Banco Santander S.A. in January 2020 | CCPSs
Disclosure of detailed information about financial instruments [line items]
Notional amount		€ 1,500
Interest rate (as a percent)		4.375%
Initial interest rate term		6 years
Reprice term		5 years
Adjustment to reference rate, after initial interest rate period		4.534%
Reference rate		5-year Mid-Swap Rate
Issuance By Banco Santander S.A. In May 2021
Disclosure of detailed information about financial instruments [line items]
Notional amount	€ 1,578
Issuance By Banco Santander S.A. In May 2021 | US Dollar Series
Disclosure of detailed information about financial instruments [line items]
Notional amount	€ 828			$ 1,000
Interest rate (as a percent)	4.75%		4.75%	4.75%
Initial interest rate term	6 years		6 years
Reprice term	5 years		5 years
Adjustment to reference rate, after initial interest rate period	3.753%		3.753%	3.753%
Reference rate	5-year UST		5-year UST
Issuance By Banco Santander S.A. In May 2021 | Euro Series
Disclosure of detailed information about financial instruments [line items]
Notional amount	€ 750
Interest rate (as a percent)	4.125%		4.125%	4.125%
Initial interest rate term	7 years		7 years
Reprice term	5 years		5 years
Adjustment to reference rate, after initial interest rate period	4.311%		4.311%	4.311%
Reference rate	5-year Euro mid-swap		5-year Euro mid-swap

Financial liabilities - Not at

Financial liabilities - Not at fair value (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of financial liabilities [line items]
Financial liabilities, at fair value	€ 623	€ 905
Other financial liabilities	33,802	26,968
Debt instruments liability
Disclosure of financial liabilities [line items]
Financial liabilities	243,230	235,269
Carrying amount
Disclosure of financial liabilities [line items]
Financial liabilities	1,276,631	1,221,220
Carrying amount | Deposits
Disclosure of financial liabilities [line items]
Financial liabilities	1,038,892	990,391
Carrying amount | Debt instruments liability
Disclosure of financial liabilities [line items]
Financial liabilities	237,739	230,829
Not measured at fair value in statement of financial position but for which fair value is disclosed
Disclosure of financial liabilities [line items]
Financial liabilities, at fair value	1,283,384	1,231,981
Not measured at fair value in statement of financial position but for which fair value is disclosed | Deposits
Disclosure of financial liabilities [line items]
Financial liabilities, at fair value	1,037,223	990,807
Not measured at fair value in statement of financial position but for which fair value is disclosed | Debt instruments liability
Disclosure of financial liabilities [line items]
Financial liabilities, at fair value	€ 246,161	€ 241,174

Provisions (Details)

Provisions (Details) € in Millions, zł in Millions	6 Months Ended
	Jun. 30, 2021EUR (€)	Jun. 30, 2021PLN (zł)	Dec. 31, 2020EUR (€)
Disclosure of provision matrix [line items]
PROVISIONS	€ 10,400		€ 10,852
Conversion Of Active Loans From Swiss Francs To PLN Loans | Santander Bank Polska and Santander Consumer Bank Poland
Disclosure of provision matrix [line items]
PROVISIONS	289	zł 1,304
Portion Of Provision Charged In Results During The First Semester | Conversion Of Active Loans From Swiss Francs To PLN Loans | Santander Bank Polska and Santander Consumer Bank Poland
Disclosure of provision matrix [line items]
PROVISIONS	154
Other combined provisions
Disclosure of provision matrix [line items]
PROVISIONS	4,878		4,425
Provisions for taxes
Disclosure of provision matrix [line items]
PROVISIONS	609		600
Provisions for other legal proceedings
Disclosure of provision matrix [line items]
PROVISIONS	1,128		1,163
Provision for customer remediation
Disclosure of provision matrix [line items]
PROVISIONS	625		395
Regulatory Framework-Related Provisions
Disclosure of provision matrix [line items]
PROVISIONS	24		69
Provision for restructuring
Disclosure of provision matrix [line items]
PROVISIONS	1,114		810
Other
Disclosure of provision matrix [line items]
PROVISIONS	946		951
BRAZIL | Provisions for employment-related proceedings
Disclosure of provision matrix [line items]
PROVISIONS	432		€ 437
Additional provisions charged to income statement	83
Use of the available provisions	138
BRAZIL | Provisions for other legal proceedings
Disclosure of provision matrix [line items]
Additional provisions charged to income statement	69
Use of the available provisions	131
UK | Regulatory Framework-Related Provisions
Disclosure of provision matrix [line items]
Use of the available provisions	46
POLAND | Regulatory Framework-Related Provisions
Disclosure of provision matrix [line items]
Additional provisions charged to income statement	€ 64

Provisions - Tax-related litiga

Provisions - Tax-related litigation (Details) - EUR (€)	Jun. 30, 2021	Dec. 31, 2020	Nov. 30, 2014	Dec. 31, 2010
Disclosure of provision matrix [line items]
PROVISIONS	€ 10,400,000,000	€ 10,852,000,000
Banco Santander (Brazil)
Disclosure of provision matrix [line items]
Tax legal obligations with probable loss risk	889,000,000
Estimated financial effect of contingent liabilities	3,632,000,000
Legal Case Relating to Questionable Deduction of Loan Losses In Income Tax Returns | Banco Santander (Brazil)
Disclosure of provision matrix [line items]
PROVISIONS	0
Legal Case Related to Infringement Notices Initiated by Tax Authorities Regarding Offsetting Tax Losses | Banco Santander (Brazil)
Disclosure of provision matrix [line items]
PROVISIONS	€ 0
Legal Case Appeal Relating To Deduction Of Expenses In Income Tax (IRPJ and CSLL) | Banco Santander (Brazil)
Disclosure of provision matrix [line items]
PROVISIONS				€ 0
Legal Case Relating to Tax Deductibility of Amortization of Goodwill Arising on Acquisition | Banco Santander (Brazil)
Disclosure of provision matrix [line items]
PROVISIONS			€ 0

Provisions - Non-tax-related pr

Provisions - Non-tax-related proceedings (Details) € in Millions, £ in Millions, zł in Millions	6 Months Ended
	Jun. 30, 2021EUR (€)	Jun. 30, 2021PLN (zł)	Jun. 30, 2021GBP (£)	Jun. 30, 2021PLN (zł)	Dec. 31, 2020EUR (€)	Dec. 31, 2020GBP (£)	Dec. 31, 2017EUR (€)
Disclosure of provision matrix [line items]
Provisions	€ 10,400				€ 10,852
Balance of relevant mortgage loans that could result in an additional charge to provisions	2,800
Compensation sought in litigation claim	112
Santander Bank Polska and Santander Consumer Bank Poland
Disclosure of provision matrix [line items]
Mortgage loans denominated in, or indexed to, CHF	2,007			zł 9,067
Banco Popular Espanol SA
Disclosure of provision matrix [line items]
Estimated cost of compensation to shareholders and bondholders							€ 680
Estimated cost of compensation to shareholders and bondholders applied to the commercial loyalty program							€ 535
Reimbursement Liability From Standstill Agreement Termination
Disclosure of provision matrix [line items]
Provisions	739		£ 636
Delforca Case To Request Court Judgment On The Validity Of The Swaps
Disclosure of provision matrix [line items]
Arbitration matter, amount claimed by entity	66
Arbitration matter, amount claimed by counterparty	56.8
Floor Clauses
Disclosure of provision matrix [line items]
Provisions	49.6
Maximum risk	900
Conversion Of Active Loans From Swiss Francs To PLN Loans
Disclosure of provision matrix [line items]
Maximum risk	€ 768	zł 3,500
Customers converting active loans (in percentage)	100.00%		100.00%	100.00%
Conversion Of Active Loans From Swiss Francs To PLN Loans | Santander Bank Polska and Santander Consumer Bank Poland
Disclosure of provision matrix [line items]
Provisions	€ 289			zł 1,304
Conversion Of Active Loans From Swiss Francs To PLN Loans | Santander Bank Polska and Santander Consumer Bank Poland | Portion Of Provision Charged In Results During The First Semester
Disclosure of provision matrix [line items]
Provisions	154
Provisions for PPI
Disclosure of provision matrix [line items]
Provisions	€ 43		£ 37		€ 87	£ 76

Equity - Capital (Details)

Equity - Capital (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Equity [abstract]
Number of shares outstanding (in shares)	17,340,641,302	17,340,641,302
Nominal amount	€ 8,670	€ 8,670

Equity - Share premium (Details

Equity - Share premium (Details) - EUR (€) € in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Disclosure of classes of share capital [line items]
Decrease in share premium	€ 4,034
Total recognized income and expense	(5,386)	€ 17,522	€ 3,557
Dividends recognised as distributions to owners	824	€ 279
Share premium
Disclosure of classes of share capital [line items]
Dividends recognised as distributions to owners	€ 477

Equity - AOCI components (Detai

Equity - AOCI components (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Equity [abstract]
OTHER ACCUMULATED COMPREHENSIVE INCOME	€ (32,181)	€ (33,144)
ITEMS NOT RECLASSIFIED TO PROFIT OR LOSS	(4,962)	(5,328)
Actuarial gains or losses on defined benefit pension plans	(4,415)	(5,002)
Non-current assets held for sale	0	0
Share in other income and expenses recognised in investments, joint ventures and associates	(11)	(2)
Other valuation adjustments	0	0
Changes in the fair value of equity instruments measured at fair value with changes in other comprehensive income	(428)	(308)
Inefficacy of fair value hedges of equity instruments measured at fair value with changes in other comprehensive income	0	0
Changes in the fair value of equity instruments measured at fair value with changes in other comprehensive income (hedged item)	213	159
Changes in the fair value of equity instruments measured at fair value with changes in other comprehensive income (hedging instrument)	(213)	(159)
Changes in the fair value of financial liabilities at fair value through profit or loss attributable to changes in credit risk	(108)	(16)
ITEMS THAT MAY BE RECLASSIFIED TO PROFIT OR LOSS:	(27,219)	(27,816)
Hedge of net investments in foreign operations (effective portion)	(4,125)	(3,124)
Exchange differences	(24,032)	(26,911)
Hedging derivatives (effective portion)	126	295
Changes in the fair value of debt instruments measured at fair value with changes in other comprehensive income	1,250	2,411
Hedging instruments (items not designated)	0	0
Non-current assets held for sale	0	0
Share in other income and expenses recognised in investments, joint ventures and associates	€ (438)	€ (487)

Equity - OCI items not reclassi

Equity - OCI items not reclassified: benefit plans (Details) - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Items not reclassified to profit or loss
Gain (loss) on remeasurement, net defined benefit liability (asset)	€ 885
UK | Pension defined benefit plans
Items not reclassified to profit or loss
Increase (decrease) in accumulated actuarial losses/profits	€ 865
Discount rates	1.91%	1.28%
Actuarial assumption of expected rates of inflation	3.24%	2.95%
SPAIN | Pension defined benefit plans
Items not reclassified to profit or loss
Discount rates	0.90%	0.60%
GERMANY | Pension defined benefit plans
Items not reclassified to profit or loss
Discount rates	1.56%	1.17%
BRAZIL | Pension defined benefit plans
Items not reclassified to profit or loss
Discount rates	4.20%	3.46%
BRAZIL | Medical Plans
Items not reclassified to profit or loss
Discount rates	4.31%	3.77%
Discount rate actuarial assumptions | SPAIN | Pension defined benefit plans
Items not reclassified to profit or loss
Increase (decrease) in accumulated actuarial losses/profits	€ 49
Discount rate actuarial assumptions | GERMANY | Pension defined benefit plans
Items not reclassified to profit or loss
Increase (decrease) in accumulated actuarial losses/profits	41
Discount rate actuarial assumptions | BRAZIL
Items not reclassified to profit or loss
Increase (decrease) in accumulated actuarial losses/profits	36
Discount rate actuarial assumptions | Other Regions
Items not reclassified to profit or loss
Increase (decrease) in accumulated actuarial losses/profits	€ 106

Equity - OCI items not reclas_2

Equity - OCI items not reclassified: equity instruments and net investment hedges (Details) - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Items not reclassified to profit or loss
Net revaluation gains (losses)	€ (428)	€ (308)
Fair value	114,505	120,953
Increase in goodwill due to exchange differences and other items	347
Equity instruments
Items not reclassified to profit or loss
Revaluation gains	759	625
Revaluation losses	(1,187)	(933)
Net revaluation gains (losses)	(428)	(308)
Fair value	2,751	2,783
Domestic | Spain
Items not reclassified to profit or loss
Revaluation gains	28	28
Revaluation losses	(1,102)	(849)
Net revaluation gains (losses)	(1,074)	(821)
Fair value	773	1,032
International | Rest of Europe
Items not reclassified to profit or loss
Revaluation gains	118	65
Revaluation losses	(75)	(76)
Net revaluation gains (losses)	43	(11)
Fair value	410	314
International | UNITED STATES
Items not reclassified to profit or loss
Revaluation gains	12	7
Revaluation losses	(4)	(4)
Net revaluation gains (losses)	8	3
Fair value	32	25
International | Latin America and rest of the world
Items not reclassified to profit or loss
Revaluation gains	601	525
Revaluation losses	(6)	(4)
Net revaluation gains (losses)	595	521
Fair value	1,536	1,412
Listed
Items not reclassified to profit or loss
Revaluation gains	606	525
Revaluation losses	(31)	(31)
Net revaluation gains (losses)	575	494
Fair value	1,571	1,424
Unlisted
Items not reclassified to profit or loss
Revaluation gains	153	100
Revaluation losses	(1,156)	(902)
Net revaluation gains (losses)	(1,003)	(802)
Fair value	€ 1,180	€ 1,359

Equity - OCI items may be recla

Equity - OCI items may be reclassified: debt instruments (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Financial assets at fair value through other comprehensive income [abstract]
Net revaluation gains/(losses)	€ 1,250	€ 2,411
Financial assets at fair value through comprehensive income	114,505	120,953
Debt Securities Plus Loans And Advances
Financial assets at fair value through other comprehensive income [abstract]
Revaluation gains	1,653	2,574
Revaluation losses	(403)	(163)
Net revaluation gains/(losses)	1,250	2,411
Financial assets at fair value through comprehensive income	111,754	118,170
Government debt securities and debt instruments issued by central banks | Spain
Financial assets at fair value through other comprehensive income [abstract]
Revaluation gains	414	693
Revaluation losses	0	0
Net revaluation gains/(losses)	414	693
Financial assets at fair value through comprehensive income	14,416	19,314
Government debt securities and debt instruments issued by central banks | Rest of Europe
Financial assets at fair value through other comprehensive income [abstract]
Revaluation gains	702	915
Revaluation losses	(38)	(69)
Net revaluation gains/(losses)	664	846
Financial assets at fair value through comprehensive income	23,326	23,116
Government debt securities and debt instruments issued by central banks | Latin America and rest of the world
Financial assets at fair value through other comprehensive income [abstract]
Revaluation gains	420	785
Revaluation losses	(323)	(73)
Net revaluation gains/(losses)	97	712
Financial assets at fair value through comprehensive income	50,308	51,026
Private-sector debt securities
Financial assets at fair value through other comprehensive income [abstract]
Revaluation gains	117	181
Revaluation losses	(42)	(21)
Net revaluation gains/(losses)	75	160
Financial assets at fair value through comprehensive income	€ 23,704	€ 24,714

Segment information (Primary _3

Segment information (Primary segment) (Details) € in Millions	6 Months Ended
	Jun. 30, 2021EUR (€)segmentoperating_area	Jun. 30, 2020EUR (€)
Operating segments
Number of operating segments | segment	5
Number of operating areas | operating_area	4
Revenue	€ 31,834	€ 35,368
Operating profit/(loss) before tax	6,914	(6,410)
Profit/(loss) attributable to the parent	3,675	(10,798)
Provisions or reversal of provisions, net	1,490	614
Adjustments for impairment loss recognised in profit or loss, goodwill		(10,100)
Impairment of deferred tax assets		2,500
Operating segment
Operating segments
Revenue	31,834	35,368
Operating profit/(loss) before tax	7,629	3,842
Profit/(loss) attributable to the parent	4,205	1,909
Adjustments
Operating segments
Revenue	0	0
Operating profit/(loss) before tax	(715)	(10,252)
Profit/(loss) attributable to the parent	(530)	(12,707)
Adjustments | Provision for restructuring
Operating segments
Provisions or reversal of provisions, net		(106)
United Kingdom And Portugal | Adjustments | Provision for restructuring
Operating segments
Provisions or reversal of provisions, net	(530)
UK | Adjustments | Provision for restructuring
Operating segments
Provisions or reversal of provisions, net		(55)
POLAND | Adjustments | Provision for restructuring
Operating segments
Provisions or reversal of provisions, net		(10)
Rest of Europe | Adjustments | Provision for restructuring
Operating segments
Provisions or reversal of provisions, net		(13)
Europe | Operating segment
Operating segments
Revenue	10,862	10,866
Operating profit/(loss) before tax	2,151	800
Profit/(loss) attributable to the parent	1,426	529
North America | Operating segment
Operating segments
Revenue	7,315	8,315
Operating profit/(loss) before tax	2,545	878
Profit/(loss) attributable to the parent	1,628	616
South America | Operating segment
Operating segments
Revenue	10,580	12,902
Operating profit/(loss) before tax	3,113	2,460
Profit/(loss) attributable to the parent	1,645	1,382
Digital Consumer Bank Segment | Operating segment
Operating segments
Revenue	3,245	3,119
Operating profit/(loss) before tax	1,008	889
Profit/(loss) attributable to the parent	569	507
Corporate Centre | Operating segment
Operating segments
Revenue	(168)	165
Operating profit/(loss) before tax	(1,188)	(1,185)
Profit/(loss) attributable to the parent	€ (1,063)	(1,125)
Santander Consumer Finance | Adjustments | Provision for restructuring
Operating segments
Provisions or reversal of provisions, net		€ (28)

Related parties (Details)

Related parties (Details) - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Expenses
Finance costs	€ 4	€ 4
Leases	0	0
Services received	0	0
Purchase of stocks	0	0
Other expenses	44	15
Total expenses	48	19
Income
Finance income	45	58
Dividends received	0	0
Services rendered	0	0
Sale of stocks	0	0
Other income	613	548
Total income	658	606
Other transactions
Financing agreements: loans and capital contributions (lender)	(459)	(333)
Financing agreements: loans and capital contributions (borrower)	(419)	164
Guarantees provided	0	(1)
Guarantees received	0	0
Commitments acquired	(32)	(79)
Dividends and other distributed profit	6	0
Other transactions	(7)	(1,010)
Balance closing period
Customers and commercial debtors	0		€ 0
Loans and credits granted	8,029		7,616
Other collection rights	963		976
Debit balances	8,992		8,592
Suppliers and creditors granted	0		0
Loans and credits received	3,254		3,680
Other payment obligations	85		92
Credit balances	3,339		3,772
Significant shareholders
Expenses
Finance costs	0	0
Leases	0	0
Services received	0	0
Purchase of stocks	0	0
Other expenses	0	0
Total expenses	0	0
Income
Finance income	0	0
Dividends received	0	0
Services rendered	0	0
Sale of stocks	0	0
Other income	0	0
Total income	0	0
Other transactions
Financing agreements: loans and capital contributions (lender)	0	0
Financing agreements: loans and capital contributions (borrower)	0	0
Guarantees provided	0	0
Guarantees received	0	0
Commitments acquired	0	0
Dividends and other distributed profit	0	0
Other transactions	0	0
Balance closing period
Customers and commercial debtors	0		0
Loans and credits granted	0		0
Other collection rights	0		0
Debit balances	0		0
Suppliers and creditors granted	0		0
Loans and credits received	0		0
Other payment obligations	0		0
Credit balances	0		0
Directors and executives
Expenses
Finance costs	0	0
Leases	0	0
Services received	0	0
Purchase of stocks	0	0
Other expenses	0	0
Total expenses	0	0
Income
Finance income	0	0
Dividends received	0	0
Services rendered	0	0
Sale of stocks	0	0
Other income	0	0
Total income	0	0
Other transactions
Financing agreements: loans and capital contributions (lender)	1	(1)
Financing agreements: loans and capital contributions (borrower)	3	(14)
Guarantees provided	0	0
Guarantees received	0	0
Commitments acquired	0	(1)
Dividends and other distributed profit	1	0
Other transactions	0	0
Balance closing period
Customers and commercial debtors	0		0
Loans and credits granted	20		24
Other collection rights	0		0
Debit balances	20		24
Suppliers and creditors granted	0		0
Loans and credits received	19		20
Other payment obligations	0		0
Credit balances	19		20
Group companies or entities
Expenses
Finance costs	4	4
Leases	0	0
Services received	0	0
Purchase of stocks	0	0
Other expenses	44	15
Total expenses	48	19
Income
Finance income	44	58
Dividends received	0	0
Services rendered	0	0
Sale of stocks	0	0
Other income	613	548
Total income	657	606
Other transactions
Financing agreements: loans and capital contributions (lender)	(492)	(324)
Financing agreements: loans and capital contributions (borrower)	(503)	148
Guarantees provided	0	(1)
Guarantees received	0	0
Commitments acquired	(38)	(83)
Dividends and other distributed profit	0	0
Other transactions	(7)	(1,010)
Balance closing period
Customers and commercial debtors	0		0
Loans and credits granted	7,988		7,497
Other collection rights	963		976
Debit balances	8,951		8,473
Suppliers and creditors granted	0		0
Loans and credits received	2,998		3,501
Other payment obligations	85		92
Credit balances	3,083		3,593
Other related parties
Expenses
Finance costs	0	0
Leases	0	0
Services received	0	0
Purchase of stocks	0	0
Other expenses	0	0
Total expenses	0	0
Income
Finance income	1	0
Dividends received	0	0
Services rendered	0	0
Sale of stocks	0	0
Other income	0	0
Total income	1	0
Other transactions
Financing agreements: loans and capital contributions (lender)	32	(8)
Financing agreements: loans and capital contributions (borrower)	81	30
Guarantees provided	0	0
Guarantees received	0	0
Commitments acquired	6	5
Dividends and other distributed profit	5	0
Other transactions	0	€ 0
Balance closing period
Customers and commercial debtors	0		0
Loans and credits granted	21		95
Other collection rights	0		0
Debit balances	21		95
Suppliers and creditors granted	0		0
Loans and credits received	237		159
Other payment obligations	0		0
Credit balances	€ 237		€ 159

Off-balance-sheet exposures (De

Off-balance-sheet exposures (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Loan commitments granted
Disclosure of contingent liabilities [line items]
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	€ 247,154	€ 241,230
Financial guarantees granted
Disclosure of contingent liabilities [line items]
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	12,121	12,377
Bank sureties
Disclosure of contingent liabilities [line items]
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	12,079	12,358
Credit derivatives sold
Disclosure of contingent liabilities [line items]
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	42	19
Other commitments granted
Disclosure of contingent liabilities [line items]
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	81,277	64,538
Other granted guarantees
Disclosure of contingent liabilities [line items]
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	38,250	33,526
Other contingent commitments
Disclosure of contingent liabilities [line items]
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	43,027	31,012
Financial instruments credit-impaired | Loan commitments granted
Disclosure of contingent liabilities [line items]
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	249	274
Financial instruments credit-impaired | Financial guarantees granted
Disclosure of contingent liabilities [line items]
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	174	124
Financial instruments credit-impaired | Other granted guarantees
Disclosure of contingent liabilities [line items]
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	703	548
Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of contingent liabilities [line items]
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	1,126	946
Financial instruments not credit-impaired | Next 12 months
Disclosure of contingent liabilities [line items]
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	331,602	310,435
Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of contingent liabilities [line items]
MEMORANDUM ITEMS: OFF BALANCE SHEET AMOUNTS	7,824	6,764
Contingent liabilities and commitments | Financial instruments credit-impaired | Lifetime Expected Credit Losses
Disclosure of contingent liabilities [line items]
Other provisions	153	141
Contingent liabilities and commitments | Financial instruments not credit-impaired | Next 12 months
Disclosure of contingent liabilities [line items]
Other provisions	331	377
Contingent liabilities and commitments | Financial instruments not credit-impaired | Lifetime Expected Credit Losses
Disclosure of contingent liabilities [line items]
Other provisions	€ 177	€ 182

Average headcount and number _3

Average headcount and number of branches - Headcount (Details)	Jun. 30, 2021numberOfEmployeesemployees	Jun. 30, 2020numberOfEmployeesemployees
Number of employees
Number of employees - Men	87,382,000	88,763,000
Number of employees - Women	103,108,000	106,398,000
Number of employees | numberOfEmployees	190,490,000	195,161,000
The Bank Personnel
Number of employees
Number of employees - Men	12,682	13,942,000
Number of employees - Women	11,979	12,681,000
Number of employees | numberOfEmployees	24,661	26,623,000

Average headcount and number _4

Average headcount and number of branches - Number of offices (Details) - Office	Jun. 30, 2021	Dec. 31, 2020
Disclosure of geographical areas [line items]
Number of offices	10,073	11,236
Spain
Disclosure of geographical areas [line items]
Number of offices	1,997	2,989
Foreign
Disclosure of geographical areas [line items]
Number of offices	8,076	8,247

Other disclosures - Valuation t

Other disclosures - Valuation techniques (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value	€ 623	€ 905
Financial Assets and Liabilities Category | Financial liabilities held for trading
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value	68,982	81,167
Financial Assets and Liabilities Category | Financial liabilities held for trading | Level 1
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value	12,862	9,863
Financial Assets and Liabilities Category | Financial liabilities held for trading | Level 2 and 3
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value	56,120	71,304
Financial Assets and Liabilities Category | Financial liabilities designated at fair value through profit or loss
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value	54,131	48,038
Financial Assets and Liabilities Category | Financial liabilities designated at fair value through profit or loss | Level 1
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value	3,451	2,118
Financial Assets and Liabilities Category | Financial liabilities designated at fair value through profit or loss | Level 2 and 3
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value	50,680	45,920
Financial Assets and Liabilities Category | Hedging derivatives, category
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value	6,573	6,869
Financial Assets and Liabilities Category | Hedging derivatives, category | Level 1
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value	0	0
Financial Assets and Liabilities Category | Hedging derivatives, category | Level 2 and 3
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value	6,573	6,869
Financial Assets and Liabilities Category | Financial assets held for trading, category
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	102,792	114,945
Financial Assets and Liabilities Category | Financial assets held for trading, category | Level 1
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	46,807	46,379
Financial Assets and Liabilities Category | Financial assets held for trading, category | Level 2 and 3
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	55,985	68,566
Financial Assets and Liabilities Category | Non-trading financial assets mandatorily at fair value through profit or loss
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	4,838	4,486
Financial Assets and Liabilities Category | Non-trading financial assets mandatorily at fair value through profit or loss | Level 1
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	2,129	1,756
Financial Assets and Liabilities Category | Non-trading financial assets mandatorily at fair value through profit or loss | Level 2 and 3
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	2,709	2,730
Financial Assets and Liabilities Category | Financial assets designated at fair value through profit or loss, category
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	56,486	48,717
Financial Assets and Liabilities Category | Financial assets designated at fair value through profit or loss, category | Level 1
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	2,243	2,509
Financial Assets and Liabilities Category | Financial assets designated at fair value through profit or loss, category | Level 2 and 3
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	54,243	46,208
Financial Assets and Liabilities Category | Financial assets at fair value through other comprehensive income
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	114,505	120,953
Financial Assets and Liabilities Category | Financial assets at fair value through other comprehensive income | Level 1
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	86,515	91,771
Financial Assets and Liabilities Category | Financial assets at fair value through other comprehensive income | Level 2 and 3
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	27,990	29,182
Financial Assets and Liabilities Category | Hedging derivatives, category
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	5,430	8,325
Financial Assets and Liabilities Category | Hedging derivatives, category | Level 1
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	0	0
Financial Assets and Liabilities Category | Hedging derivatives, category | Level 2 and 3
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	5,430	8,325
Liabilities Under Insurance Contracts
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value	1,014	910
Liabilities Under Insurance Contracts | Level 1
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value	0	0
Liabilities Under Insurance Contracts | Level 2 and 3
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value	€ 1,014	€ 910

Other disclosures - Credit and

Other disclosures - Credit and debt valuation adjustments (CVA, DVA) (Details) € in Millions	6 Months Ended
	Jun. 30, 2021EUR (€)
Disclosure of detailed information about financial instruments [line items]
Amount of CVA	€ 251.9
Change in CVA (as a percent)	26.60%
Amount of DVA	€ 169.9
Change in DVA (as a percent)	13.40%
Maximum
Disclosure of detailed information about financial instruments [line items]
Credit spread change (as a percent)	12.00%

Other disclosures - Valuation a

Other disclosures - Valuation adjustments due to model risk (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	€ 623	€ 905
Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	137,823	146,468
Financial liabilities, at fair value	113,764	124,098
Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	8,534	8,543
Financial liabilities, at fair value	623	905
Financial liabilities held for trading | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	256	295
Financial liabilities held for trading | Exchange rate options | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	23	1
Financial liabilities held for trading | Interest rate options | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	36	49
Financial liabilities held for trading | Index and securities options | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	132	97
Financial liabilities held for trading | Interest rate and equity futures | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	0	2
Financial liabilities held for trading | Other | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	8	65
Financial liabilities designated at fair value through profit or loss | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	367	610
Financial assets held for trading, category | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	611	740
Financial assets held for trading, category | Debt instruments asset | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	19	7
Financial assets held for trading, category | Derivatives | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	589	730
Financial assets held for trading, category | Swaps | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	233	272
Financial assets held for trading, category | Exchange rate options | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	33	22
Financial assets held for trading, category | Interest rate options | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	185	241
Financial assets held for trading, category | Index and securities options | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	66	94
Financial assets held for trading, category | Other | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	72	101
Non-trading financial assets mandatorily at fair value through profit or loss | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	1,469	934
Non-trading financial assets mandatorily at fair value through profit or loss | Loans and advances - Customers | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	266	295
Non-trading financial assets mandatorily at fair value through profit or loss | Equity instruments | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	1,053	505
Non-trading financial assets mandatorily at fair value through profit or loss | Debt instruments asset | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	150	134
Financial assets designated at fair value through profit or loss, category | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	478	649
Financial assets designated at fair value through profit or loss, category | Loans and advances - Credit institutions | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	0	163
Financial assets designated at fair value through profit or loss, category | Loans and advances - Customers | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	17	19
Financial assets designated at fair value through profit or loss, category | Debt instruments asset | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	461	467
Financial assets at fair value through other comprehensive income | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	5,976	6,220
Financial assets at fair value through other comprehensive income | Loans and advances - Customers | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	4,668	4,792
Financial assets at fair value through other comprehensive income | Equity instruments | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	1,064	1,222
Financial assets at fair value through other comprehensive income | Debt instruments asset | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	244	206
Financial Assets and Liabilities Category | Financial liabilities held for trading
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	68,982	81,167
Financial Assets and Liabilities Category | Financial liabilities held for trading | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	55,864	71,009
Financial Assets and Liabilities Category | Financial liabilities held for trading | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	256	295
Financial Assets and Liabilities Category | Financial liabilities held for trading | Derivatives | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	51,846	63,920
Financial Assets and Liabilities Category | Financial liabilities held for trading | Derivatives | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	256	295
Financial Assets and Liabilities Category | Financial liabilities held for trading | Swaps | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	42,360	51,584
Financial Assets and Liabilities Category | Financial liabilities held for trading | Swaps | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	57	81
Financial Assets and Liabilities Category | Financial liabilities held for trading | Exchange rate options | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	530	724
Financial Assets and Liabilities Category | Financial liabilities held for trading | Exchange rate options | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	23	1
Financial Assets and Liabilities Category | Financial liabilities held for trading | Interest rate options | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	3,050	4,226
Financial Assets and Liabilities Category | Financial liabilities held for trading | Interest rate options | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	36	49
Financial Assets and Liabilities Category | Financial liabilities held for trading | Index and securities options | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	657	456
Financial Assets and Liabilities Category | Financial liabilities held for trading | Index and securities options | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	132	97
Financial Assets and Liabilities Category | Financial liabilities held for trading | Interest rate and equity futures | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	242	1,054
Financial Assets and Liabilities Category | Financial liabilities held for trading | Interest rate and equity futures | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	0	2
Financial Assets and Liabilities Category | Financial liabilities held for trading | Other | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	5,007	5,876
Financial Assets and Liabilities Category | Financial liabilities held for trading | Other | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	8	65
Financial Assets and Liabilities Category | Financial liabilities held for trading | Short positions | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	4,018	7,089
Financial Assets and Liabilities Category | Financial liabilities held for trading | Short positions | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	0	0
Financial Assets and Liabilities Category | Financial liabilities held for trading | Credit risk derivatives | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	(3)	(4)
Financial Assets and Liabilities Category | Hedging derivatives, category
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	6,573	6,869
Financial Assets and Liabilities Category | Hedging derivatives, category | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	6,573	6,869
Financial Assets and Liabilities Category | Hedging derivatives, category | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	0	0
Financial Assets and Liabilities Category | Hedging derivatives, category | Swaps | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	5,247	5,821
Financial Assets and Liabilities Category | Hedging derivatives, category | Swaps | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	0	0
Financial Assets and Liabilities Category | Hedging derivatives, category | Interest rate options | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	11	13
Financial Assets and Liabilities Category | Hedging derivatives, category | Interest rate options | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	0	0
Financial Assets and Liabilities Category | Hedging derivatives, category | Other | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	1,315	1,035
Financial Assets and Liabilities Category | Hedging derivatives, category | Other | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	0	0
Financial Assets and Liabilities Category | Financial liabilities designated at fair value through profit or loss
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	54,131	48,038
Financial Assets and Liabilities Category | Financial liabilities designated at fair value through profit or loss | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	50,313	45,310
Financial Assets and Liabilities Category | Financial liabilities designated at fair value through profit or loss | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	367	610
Financial Assets and Liabilities Category | Financial assets held for trading, category
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	102,792	114,945
Financial Assets and Liabilities Category | Financial assets held for trading, category | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	55,374	67,826
Financial Assets and Liabilities Category | Financial assets held for trading, category | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	611	740
Financial Assets and Liabilities Category | Financial assets held for trading, category | Interest rate futures | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	501	1,069
Financial Assets and Liabilities Category | Financial assets held for trading, category | Interest rate futures | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	0	0
Financial Assets and Liabilities Category | Financial assets held for trading, category | Loans and advances - Credit institutions | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	0	3
Financial Assets and Liabilities Category | Financial assets held for trading, category | Loans and advances - Credit institutions | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	0	0
Financial Assets and Liabilities Category | Financial assets held for trading, category | Loans and advances - Customers | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	265	296
Financial Assets and Liabilities Category | Financial assets held for trading, category | Loans and advances - Customers | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	0	0
Financial Assets and Liabilities Category | Financial assets held for trading, category | Debt and equity instruments | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	1,214	1,453
Financial Assets and Liabilities Category | Financial assets held for trading, category | Debt and equity instruments | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	22	10
Financial Assets and Liabilities Category | Financial assets held for trading, category | Derivatives | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	53,895	66,074
Financial Assets and Liabilities Category | Financial assets held for trading, category | Derivatives | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	589	730
Financial Assets and Liabilities Category | Financial assets held for trading, category | Swaps | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	44,666	54,488
Financial Assets and Liabilities Category | Financial assets held for trading, category | Swaps | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	233	272
Financial Assets and Liabilities Category | Financial assets held for trading, category | Exchange rate options | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	451	696
Financial Assets and Liabilities Category | Financial assets held for trading, category | Exchange rate options | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	33	22
Financial Assets and Liabilities Category | Financial assets held for trading, category | Interest rate options | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	2,429	3,129
Financial Assets and Liabilities Category | Financial assets held for trading, category | Interest rate options | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	185	241
Financial Assets and Liabilities Category | Financial assets held for trading, category | Index and securities options | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	667	554
Financial Assets and Liabilities Category | Financial assets held for trading, category | Index and securities options | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	66	94
Financial Assets and Liabilities Category | Financial assets held for trading, category | Other | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	5,181	6,138
Financial Assets and Liabilities Category | Financial assets held for trading, category | Other | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	72	101
Financial Assets and Liabilities Category | Hedging derivatives, category
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	5,430	8,325
Financial Assets and Liabilities Category | Hedging derivatives, category | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	5,430	8,325
Financial Assets and Liabilities Category | Hedging derivatives, category | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	0	0
Financial Assets and Liabilities Category | Hedging derivatives, category | Swaps | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	5,150	6,998
Financial Assets and Liabilities Category | Hedging derivatives, category | Swaps | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	0	0
Financial Assets and Liabilities Category | Hedging derivatives, category | Interest rate options | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	24	25
Financial Assets and Liabilities Category | Hedging derivatives, category | Interest rate options | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	0	0
Financial Assets and Liabilities Category | Hedging derivatives, category | Other | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	256	1,302
Financial Assets and Liabilities Category | Hedging derivatives, category | Other | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	0	0
Financial Assets and Liabilities Category | Non-trading financial assets mandatorily at fair value through profit or loss
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	4,838	4,486
Financial Assets and Liabilities Category | Non-trading financial assets mandatorily at fair value through profit or loss | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	1,240	1,796
Financial Assets and Liabilities Category | Non-trading financial assets mandatorily at fair value through profit or loss | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	1,469	934
Financial Assets and Liabilities Category | Non-trading financial assets mandatorily at fair value through profit or loss | Loans and advances | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	155	257
Financial Assets and Liabilities Category | Non-trading financial assets mandatorily at fair value through profit or loss | Loans and advances | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	266	295
Financial Assets and Liabilities Category | Non-trading financial assets mandatorily at fair value through profit or loss | Equity instruments | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	428	984
Financial Assets and Liabilities Category | Non-trading financial assets mandatorily at fair value through profit or loss | Equity instruments | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	1,053	505
Financial Assets and Liabilities Category | Non-trading financial assets mandatorily at fair value through profit or loss | Debt instruments asset | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	657	555
Financial Assets and Liabilities Category | Non-trading financial assets mandatorily at fair value through profit or loss | Debt instruments asset | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	150	134
Financial Assets and Liabilities Category | Financial assets designated at fair value through profit or loss, category
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	56,486	48,717
Financial Assets and Liabilities Category | Financial assets designated at fair value through profit or loss, category | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	53,765	45,559
Financial Assets and Liabilities Category | Financial assets designated at fair value through profit or loss, category | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	478	649
Financial Assets and Liabilities Category | Financial assets designated at fair value through profit or loss, category | Loans and advances - Credit institutions | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	23,910	11,973
Financial Assets and Liabilities Category | Financial assets designated at fair value through profit or loss, category | Loans and advances - Credit institutions | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	0	163
Financial Assets and Liabilities Category | Financial assets designated at fair value through profit or loss, category | Loans and advances - Central banks | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	4,881	9,481
Financial Assets and Liabilities Category | Financial assets designated at fair value through profit or loss, category | Loans and advances - Central banks | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	0	0
Financial Assets and Liabilities Category | Financial assets designated at fair value through profit or loss, category | Loans and advances - Customers | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	24,916	24,102
Financial Assets and Liabilities Category | Financial assets designated at fair value through profit or loss, category | Loans and advances - Customers | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	17	19
Financial Assets and Liabilities Category | Financial assets designated at fair value through profit or loss, category | Debt and equity instruments | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	58	3
Financial Assets and Liabilities Category | Financial assets designated at fair value through profit or loss, category | Debt and equity instruments | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	461	467
Financial Assets and Liabilities Category | Financial assets at fair value through other comprehensive income
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	114,505	120,953
Financial Assets and Liabilities Category | Financial assets at fair value through other comprehensive income | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	22,014	22,962
Financial Assets and Liabilities Category | Financial assets at fair value through other comprehensive income | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	5,976	6,220
Financial Assets and Liabilities Category | Financial assets at fair value through other comprehensive income | Loans and advances | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	3,537	4,477
Financial Assets and Liabilities Category | Financial assets at fair value through other comprehensive income | Loans and advances | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	4,668	4,791
Financial Assets and Liabilities Category | Financial assets at fair value through other comprehensive income | Equity instruments | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	74	75
Financial Assets and Liabilities Category | Financial assets at fair value through other comprehensive income | Equity instruments | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	1,064	1,223
Financial Assets and Liabilities Category | Financial assets at fair value through other comprehensive income | Debt instruments asset | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	18,403	18,410
Financial Assets and Liabilities Category | Financial assets at fair value through other comprehensive income | Debt instruments asset | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial assets, at fair value	244	206
Liabilities Under Insurance Contracts
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	1,014	910
Liabilities Under Insurance Contracts | Level 2
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	1,014	910
Liabilities Under Insurance Contracts | Level 3
Measurement of financial assets and liabilities and recognition of fair value changes
Financial liabilities, at fair value	€ 0	€ 0

Other disclosures - Level 3 Fin

Other disclosures - Level 3 Financial Instruments (Details) - EUR (€) € in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Level 3
Disclosure of detailed information about financial instruments [line items]
Net (loss) gain recognized in profit or loss arising from models whose significant inputs are unobservable market data	€ 11,000	€ (56,000)
Volatility Option Model Valuation Technique | Financial liabilities at fair value, class | Cap&Floor | Minimum
Disclosure of detailed information about financial instruments [line items]
Volatility, liabilities (as a percent)	10.00%
Volatility Option Model Valuation Technique | Financial liabilities at fair value, class | Cap&Floor | Maximum
Disclosure of detailed information about financial instruments [line items]
Volatility, liabilities (as a percent)	90.00%
Volatility Option Model Valuation Technique | Financial liabilities at fair value, class | Cap&Floor | Weighted average
Disclosure of detailed information about financial instruments [line items]
Volatility, liabilities (as a percent)	34.73%
Volatility Option Model Valuation Technique | Unfavourable Scenario | Financial liabilities at fair value, class | Cap&Floor
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ 0
Volatility Option Model Valuation Technique | Favourable Scenario | Financial liabilities at fair value, class | Cap&Floor
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 0
Forward Estimation | Financial liabilities at fair value, class | Interest rate swap | Minimum
Disclosure of detailed information about financial instruments [line items]
Prepayment rate, liabilities (as a percent)	6.00%
Forward Estimation | Financial liabilities at fair value, class | Interest rate swap | Maximum
Disclosure of detailed information about financial instruments [line items]
Prepayment rate, liabilities (as a percent)	12.00%
Forward Estimation | Financial liabilities at fair value, class | Interest rate swap | Weighted average
Disclosure of detailed information about financial instruments [line items]
Prepayment rate, liabilities (as a percent)	9.00%
Forward Estimation | Unfavourable Scenario | Financial liabilities at fair value, class | Interest rate swap
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ 0
Forward Estimation | Favourable Scenario | Financial liabilities at fair value, class | Interest rate swap
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 0
FX Option Pricing Model | Financial liabilities at fair value, class | Foreign Exchange Option | Minimum
Disclosure of detailed information about financial instruments [line items]
Volatility, liabilities (as a percent)	0.02%
FX Option Pricing Model | Financial liabilities at fair value, class | Foreign Exchange Option | Maximum
Disclosure of detailed information about financial instruments [line items]
Volatility, liabilities (as a percent)	0.134%
FX Option Pricing Model | Financial liabilities at fair value, class | Foreign Exchange Option | Weighted average
Disclosure of detailed information about financial instruments [line items]
Volatility, liabilities (as a percent)	12.26%
FX Option Pricing Model | Unfavourable Scenario | Financial liabilities at fair value, class | Foreign Exchange Option
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ 0
FX Option Pricing Model | Favourable Scenario | Financial liabilities at fair value, class | Foreign Exchange Option
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 10
Option pricing model | Financial liabilities at fair value, class | EQ Option | Minimum
Disclosure of detailed information about financial instruments [line items]
Correlations, liabilities (as a percent)	(100.00%)
Option pricing model | Financial liabilities at fair value, class | EQ Option | Maximum
Disclosure of detailed information about financial instruments [line items]
Correlations, liabilities (as a percent)	100.00%
Option pricing model | Financial liabilities at fair value, class | EQ Option | Weighted average
Disclosure of detailed information about financial instruments [line items]
Correlations, liabilities (as a percent)	100.00%
Option pricing model | Financial liabilities at fair value, class | Property Derivatives | Minimum
Disclosure of detailed information about financial instruments [line items]
Growth rate, liabilities (as a percent)	0.00%
Option pricing model | Financial liabilities at fair value, class | Property Derivatives | Maximum
Disclosure of detailed information about financial instruments [line items]
Growth rate, liabilities (as a percent)	5.00%
Option pricing model | Financial liabilities at fair value, class | Property Derivatives | Weighted average
Disclosure of detailed information about financial instruments [line items]
Growth rate, liabilities (as a percent)	2.50%
Option pricing model | Unfavourable Scenario | Financial liabilities at fair value, class | EQ Option
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (40)
Option pricing model | Unfavourable Scenario | Financial liabilities at fair value, class | Property Derivatives
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	2,800
Option pricing model | Favourable Scenario | Financial liabilities at fair value, class | EQ Option
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	40
Option pricing model | Favourable Scenario | Financial liabilities at fair value, class | Property Derivatives
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 2,800
Financial assets held for trading, category | Cap&Floor | Volatility Option Model Valuation Technique | Minimum
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	10.00%
Financial assets held for trading, category | Cap&Floor | Volatility Option Model Valuation Technique | Maximum
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	90.00%
Financial assets held for trading, category | Cap&Floor | Volatility Option Model Valuation Technique | Weighted average
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	34.73%
Financial assets held for trading, category | Cap&Floor | Volatility Option Model Valuation Technique | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ 0
Financial assets held for trading, category | Cap&Floor | Volatility Option Model Valuation Technique | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 0
Financial assets held for trading, category | CCS | Flow Discounting Method | Minimum
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	(0.007%)
Financial assets held for trading, category | CCS | Flow Discounting Method | Maximum
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	0.70%
Financial assets held for trading, category | CCS | Flow Discounting Method | Weighted average
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	0.66%
Financial assets held for trading, category | CCS | Flow Discounting Method | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (190)
Financial assets held for trading, category | CCS | Flow Discounting Method | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 190
Financial assets held for trading, category | CCS | Forward Estimation | Minimum
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	0.03%
Financial assets held for trading, category | CCS | Forward Estimation | Maximum
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	0.04%
Financial assets held for trading, category | CCS | Forward Estimation | Weighted average
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	0.83%
Financial assets held for trading, category | CCS | Forward Estimation | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (50)
Financial assets held for trading, category | CCS | Forward Estimation | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 60
Financial assets held for trading, category | Convertibility curve - inputs: NDFs Offshore | Forward Estimation | Minimum
Disclosure of detailed information about financial instruments [line items]
Price, assets (as a percent)	0.00%
Financial assets held for trading, category | Convertibility curve - inputs: NDFs Offshore | Forward Estimation | Maximum
Disclosure of detailed information about financial instruments [line items]
Price, assets (as a percent)	2.00%
Financial assets held for trading, category | Convertibility curve - inputs: NDFs Offshore | Forward Estimation | Weighted average
Disclosure of detailed information about financial instruments [line items]
Price, assets (as a percent)	0.61%
Financial assets held for trading, category | Convertibility curve - inputs: NDFs Offshore | Forward Estimation | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (720)
Financial assets held for trading, category | Convertibility curve - inputs: NDFs Offshore | Forward Estimation | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 310
Financial assets held for trading, category | EQ Option | EQ Option Pricing Model | Minimum
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	0.00%
Financial assets held for trading, category | EQ Option | EQ Option Pricing Model | Maximum
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	90.00%
Financial assets held for trading, category | EQ Option | EQ Option Pricing Model | Weighted average
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	61.20%
Financial assets held for trading, category | EQ Option | EQ Option Pricing Model | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (320)
Financial assets held for trading, category | EQ Option | EQ Option Pricing Model | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 670
Financial assets held for trading, category | EQ Option | Local Volatility Valuation Technique | Minimum
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	10.00%
Financial assets held for trading, category | EQ Option | Local Volatility Valuation Technique | Maximum
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	90.00%
Financial assets held for trading, category | EQ Option | Local Volatility Valuation Technique | Weighted average
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	40.00%
Financial assets held for trading, category | EQ Option | Local Volatility Valuation Technique | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (2,110)
Financial assets held for trading, category | EQ Option | Local Volatility Valuation Technique | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 2,110
Financial assets held for trading, category | Forward Rate Agreement | Asset Swap Model Valuation Technique | Minimum
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	0.00%
Financial assets held for trading, category | Forward Rate Agreement | Asset Swap Model Valuation Technique | Maximum
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	4.00%
Financial assets held for trading, category | Forward Rate Agreement | Asset Swap Model Valuation Technique | Weighted average
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	1.78%
Financial assets held for trading, category | Forward Rate Agreement | Asset Swap Model Valuation Technique | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (830)
Financial assets held for trading, category | Forward Rate Agreement | Asset Swap Model Valuation Technique | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 660
Financial assets held for trading, category | Interest rate swap | Flow Discounting Method | Minimum
Disclosure of detailed information about financial instruments [line items]
Swap rate, assets (as a percent)	7.40%
Financial assets held for trading, category | Interest rate swap | Flow Discounting Method | Maximum
Disclosure of detailed information about financial instruments [line items]
Swap rate, assets (as a percent)	7.90%
Financial assets held for trading, category | Interest rate swap | Flow Discounting Method | Weighted average
Disclosure of detailed information about financial instruments [line items]
Swap rate, assets (as a percent)	(2.64%)
Financial assets held for trading, category | Interest rate swap | Flow Discounting Method | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (160)
Financial assets held for trading, category | Interest rate swap | Flow Discounting Method | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 70
Financial assets held for trading, category | Interest rate swap | Forward Estimation | Minimum
Disclosure of detailed information about financial instruments [line items]
Prepayment rate, assets (as a percent)	6.00%
Financial assets held for trading, category | Interest rate swap | Forward Estimation | Maximum
Disclosure of detailed information about financial instruments [line items]
Prepayment rate, assets (as a percent)	12.00%
Financial assets held for trading, category | Interest rate swap | Forward Estimation | Weighted average
Disclosure of detailed information about financial instruments [line items]
Prepayment rate, assets (as a percent)	9.00%
Financial assets held for trading, category | Interest rate swap | Forward Estimation | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ 0
Financial assets held for trading, category | Interest rate swap | Forward Estimation | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 0
Financial assets held for trading, category | Interest rate swap | Asset Swap Model Valuation Technique | Minimum
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	0.00%
Financial assets held for trading, category | Interest rate swap | Asset Swap Model Valuation Technique | Maximum
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	15.00%
Financial assets held for trading, category | Interest rate swap | Asset Swap Model Valuation Technique | Weighted average
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	10.71%
Financial assets held for trading, category | Interest rate swap | Asset Swap Model Valuation Technique | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (60)
Financial assets held for trading, category | Interest rate swap | Asset Swap Model Valuation Technique | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 160
Financial assets held for trading, category | Interest rate swap | Prepayment Modelling Valuation Technique | Minimum
Disclosure of detailed information about financial instruments [line items]
Prepayment rate, assets (as a percent)	2.50%
Financial assets held for trading, category | Interest rate swap | Prepayment Modelling Valuation Technique | Maximum
Disclosure of detailed information about financial instruments [line items]
Prepayment rate, assets (as a percent)	6.20%
Financial assets held for trading, category | Interest rate swap | Prepayment Modelling Valuation Technique | Weighted average
Disclosure of detailed information about financial instruments [line items]
Prepayment rate, assets (as a percent)	0.50%
Financial assets held for trading, category | Interest rate swap | Prepayment Modelling Valuation Technique | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (130)
Financial assets held for trading, category | Interest rate swap | Prepayment Modelling Valuation Technique | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	70
Financial assets held for trading, category | Interest rate swap | Other Valuation Techniques | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	(1,400)
Financial assets held for trading, category | Interest rate swap | Other Valuation Techniques | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 1,400
Financial assets held for trading, category | Foreign Exchange Option | FX Option Pricing Model | Minimum
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	0.00%
Financial assets held for trading, category | Foreign Exchange Option | FX Option Pricing Model | Maximum
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	50.00%
Financial assets held for trading, category | Foreign Exchange Option | FX Option Pricing Model | Weighted average
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	32.14%
Financial assets held for trading, category | Foreign Exchange Option | FX Option Pricing Model | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (360)
Financial assets held for trading, category | Foreign Exchange Option | FX Option Pricing Model | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 650
Financial assets held for trading, category | Inflation Derivatives | Volatility Option Model Valuation Technique | Minimum
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	0.00%
Financial assets held for trading, category | Inflation Derivatives | Volatility Option Model Valuation Technique | Maximum
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	40.00%
Financial assets held for trading, category | Inflation Derivatives | Volatility Option Model Valuation Technique | Weighted average
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	13.29%
Financial assets held for trading, category | Inflation Derivatives | Volatility Option Model Valuation Technique | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (430)
Financial assets held for trading, category | Inflation Derivatives | Volatility Option Model Valuation Technique | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 220
Financial assets held for trading, category | Inflation Derivatives | Asset Swap Model Valuation Technique | Minimum
Disclosure of detailed information about financial instruments [line items]
Inflation swap rate, assets (as a percent)	(1.00%)
Financial assets held for trading, category | Inflation Derivatives | Asset Swap Model Valuation Technique | Maximum
Disclosure of detailed information about financial instruments [line items]
Inflation swap rate, assets (as a percent)	50.00%
Financial assets held for trading, category | Inflation Derivatives | Asset Swap Model Valuation Technique | Weighted average
Disclosure of detailed information about financial instruments [line items]
Inflation swap rate, assets (as a percent)	83.33%
Financial assets held for trading, category | Inflation Derivatives | Asset Swap Model Valuation Technique | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (680)
Financial assets held for trading, category | Inflation Derivatives | Asset Swap Model Valuation Technique | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 340
Financial assets held for trading, category | Interest rate futures | Asset Swap Model Valuation Technique | Minimum
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	0.00%
Financial assets held for trading, category | Interest rate futures | Asset Swap Model Valuation Technique | Maximum
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	15.00%
Financial assets held for trading, category | Interest rate futures | Asset Swap Model Valuation Technique | Weighted average
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	5.91%
Financial assets held for trading, category | Interest rate futures | Asset Swap Model Valuation Technique | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (990)
Financial assets held for trading, category | Interest rate futures | Asset Swap Model Valuation Technique | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 640
Financial assets held for trading, category | Interest rate options | Interest Rate Option Pricing Model | Minimum
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	0.00%
Financial assets held for trading, category | Interest rate options | Interest Rate Option Pricing Model | Maximum
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	100.00%
Financial assets held for trading, category | Interest rate options | Interest Rate Option Pricing Model | Weighted average
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	60.47%
Financial assets held for trading, category | Interest rate options | Interest Rate Option Pricing Model | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (270)
Financial assets held for trading, category | Interest rate options | Interest Rate Option Pricing Model | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 410
Financial assets held for trading, category | Property Derivatives | Option pricing model | Minimum
Disclosure of detailed information about financial instruments [line items]
Growth rate, assets (as a percent)	0.00%
Financial assets held for trading, category | Property Derivatives | Option pricing model | Maximum
Disclosure of detailed information about financial instruments [line items]
Growth rate, assets (as a percent)	5.00%
Financial assets held for trading, category | Property Derivatives | Option pricing model | Weighted average
Disclosure of detailed information about financial instruments [line items]
Growth rate, assets (as a percent)	2.50%
Financial assets held for trading, category | Property Derivatives | Option pricing model | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (9,550)
Financial assets held for trading, category | Property Derivatives | Option pricing model | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 9,550
Financial assets held for trading, category | Swaption | Interest Rate Option Pricing Model | Minimum
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	0.00%
Financial assets held for trading, category | Swaption | Interest Rate Option Pricing Model | Maximum
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	40.00%
Financial assets held for trading, category | Swaption | Interest Rate Option Pricing Model | Weighted average
Disclosure of detailed information about financial instruments [line items]
Volatility, assets (as a percent)	26.67%
Financial assets held for trading, category | Swaption | Interest Rate Option Pricing Model | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (160)
Financial assets held for trading, category | Swaption | Interest Rate Option Pricing Model | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 310
Financial assets designated at fair value through profit or loss, category | Loans and advances - Customers | Black Scholes Model | Minimum
Disclosure of detailed information about financial instruments [line items]
Growth rate, assets (as a percent)	0.00%
Financial assets designated at fair value through profit or loss, category | Loans and advances - Customers | Black Scholes Model | Maximum
Disclosure of detailed information about financial instruments [line items]
Growth rate, assets (as a percent)	5.00%
Financial assets designated at fair value through profit or loss, category | Loans and advances - Customers | Black Scholes Model | Weighted average
Disclosure of detailed information about financial instruments [line items]
Growth rate, assets (as a percent)	2.50%
Financial assets designated at fair value through profit or loss, category | Loans and advances - Customers | Black Scholes Model | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (2,330)
Financial assets designated at fair value through profit or loss, category | Loans and advances - Customers | Black Scholes Model | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 2,330
Financial assets designated at fair value through profit or loss, category | Other loans | Flow Discounting Method | Minimum
Disclosure of detailed information about financial instruments [line items]
Credit spreads, assets (as a percent)	0.10%
Financial assets designated at fair value through profit or loss, category | Other loans | Flow Discounting Method | Maximum
Disclosure of detailed information about financial instruments [line items]
Credit spreads, assets (as a percent)	1.40%
Financial assets designated at fair value through profit or loss, category | Other loans | Flow Discounting Method | Weighted average
Disclosure of detailed information about financial instruments [line items]
Credit spreads, assets (as a percent)	0.67%
Financial assets designated at fair value through profit or loss, category | Other loans | Flow Discounting Method | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (260)
Financial assets designated at fair value through profit or loss, category | Other loans | Flow Discounting Method | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 260
Financial assets designated at fair value through profit or loss, category | Government Debt | Flow Discounting Method | Minimum
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	0.00%
Financial assets designated at fair value through profit or loss, category | Government Debt | Flow Discounting Method | Maximum
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	10.00%
Financial assets designated at fair value through profit or loss, category | Government Debt | Flow Discounting Method | Weighted average
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	8.33%
Financial assets designated at fair value through profit or loss, category | Government Debt | Flow Discounting Method | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (5,920)
Financial assets designated at fair value through profit or loss, category | Government Debt | Flow Discounting Method | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 29,580
Financial assets designated at fair value through profit or loss, category | Property Securities | Probability Weighted Present Value Model Growth Rate Approach | Minimum
Disclosure of detailed information about financial instruments [line items]
Growth rate, assets (as a percent)	0.00%
Financial assets designated at fair value through profit or loss, category | Property Securities | Probability Weighted Present Value Model Growth Rate Approach | Maximum
Disclosure of detailed information about financial instruments [line items]
Growth rate, assets (as a percent)	5.00%
Financial assets designated at fair value through profit or loss, category | Property Securities | Probability Weighted Present Value Model Growth Rate Approach | Weighted average
Disclosure of detailed information about financial instruments [line items]
Growth rate, assets (as a percent)	2.50%
Financial assets designated at fair value through profit or loss, category | Property Securities | Probability Weighted Present Value Model Growth Rate Approach | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (1,280)
Financial assets designated at fair value through profit or loss, category | Property Securities | Probability Weighted Present Value Model Growth Rate Approach | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 1,280
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Loans and advances - Customers | Flow Discounting Method | Minimum
Disclosure of detailed information about financial instruments [line items]
Margin of a reference portfolio, assets (as a percent)	(0.01%)
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Loans and advances - Customers | Flow Discounting Method | Maximum
Disclosure of detailed information about financial instruments [line items]
Margin of a reference portfolio, assets (as a percent)	(0.01%)
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Loans and advances - Customers | Flow Discounting Method | Weighted average
Disclosure of detailed information about financial instruments [line items]
Margin of a reference portfolio, assets (as a percent)	1.00%
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Loans and advances - Customers | Flow Discounting Method | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (1,380)
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Loans and advances - Customers | Flow Discounting Method | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 3,090
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Corporate Debt | Flow Discounting Method | Minimum
Disclosure of detailed information about financial instruments [line items]
Margin of a reference portfolio, assets (as a percent)	(0.01%)
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Corporate Debt | Flow Discounting Method | Maximum
Disclosure of detailed information about financial instruments [line items]
Margin of a reference portfolio, assets (as a percent)	(0.01%)
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Corporate Debt | Flow Discounting Method | Weighted average
Disclosure of detailed information about financial instruments [line items]
Margin of a reference portfolio, assets (as a percent)	1.00%
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Corporate Debt | Flow Discounting Method | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (560)
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Corporate Debt | Flow Discounting Method | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 600
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Equity Instruments | Price Based Valuation Technique | Minimum
Disclosure of detailed information about financial instruments [line items]
Price, assets (as a percent)	90.00%
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Equity Instruments | Price Based Valuation Technique | Maximum
Disclosure of detailed information about financial instruments [line items]
Price, assets (as a percent)	110.00%
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Equity Instruments | Price Based Valuation Technique | Weighted average
Disclosure of detailed information about financial instruments [line items]
Price, assets (as a percent)	10.00%
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Equity Instruments | Price Based Valuation Technique | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (105,260)
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category | Equity Instruments | Price Based Valuation Technique | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	105,260
Financial assets measured at fair value through other comprehensive income, category | Loans and advances - Customers | Flow Discounting Method On Credit Spread | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	(3,900)
Financial assets measured at fair value through other comprehensive income, category | Loans and advances - Customers | Flow Discounting Method On Credit Spread | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 0
Financial assets measured at fair value through other comprehensive income, category | Loans and advances - Customers | Flow Discounting Method On interest Rate Curve | Minimum
Disclosure of detailed information about financial instruments [line items]
Interest rate curve, assets (as a percent)	(0.001%)
Financial assets measured at fair value through other comprehensive income, category | Loans and advances - Customers | Flow Discounting Method On interest Rate Curve | Maximum
Disclosure of detailed information about financial instruments [line items]
Interest rate curve, assets (as a percent)	0.10%
Financial assets measured at fair value through other comprehensive income, category | Loans and advances - Customers | Flow Discounting Method On interest Rate Curve | Weighted average
Disclosure of detailed information about financial instruments [line items]
Interest rate curve, assets (as a percent)	0.12%
Financial assets measured at fair value through other comprehensive income, category | Loans and advances - Customers | Flow Discounting Method On interest Rate Curve | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (140)
Financial assets measured at fair value through other comprehensive income, category | Loans and advances - Customers | Flow Discounting Method On interest Rate Curve | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 140
Financial assets measured at fair value through other comprehensive income, category | Other loans | Flow Discounting Method | Minimum
Disclosure of detailed information about financial instruments [line items]
Credit spreads, assets (as a percent)	0.10%
Financial assets measured at fair value through other comprehensive income, category | Other loans | Flow Discounting Method | Maximum
Disclosure of detailed information about financial instruments [line items]
Credit spreads, assets (as a percent)	1.40%
Financial assets measured at fair value through other comprehensive income, category | Other loans | Flow Discounting Method | Weighted average
Disclosure of detailed information about financial instruments [line items]
Credit spreads, assets (as a percent)	0.67%
Financial assets measured at fair value through other comprehensive income, category | Other loans | Flow Discounting Method | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (260)
Financial assets measured at fair value through other comprehensive income, category | Other loans | Flow Discounting Method | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 260
Financial assets measured at fair value through other comprehensive income, category | Government Debt | Flow Discounting Method | Minimum
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	1.20%
Financial assets measured at fair value through other comprehensive income, category | Government Debt | Flow Discounting Method | Maximum
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	1.40%
Financial assets measured at fair value through other comprehensive income, category | Government Debt | Flow Discounting Method | Weighted average
Disclosure of detailed information about financial instruments [line items]
Interest rate for currency swap contracts, assets (as a percent)	0.10%
Financial assets measured at fair value through other comprehensive income, category | Government Debt | Flow Discounting Method | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ 0
Financial assets measured at fair value through other comprehensive income, category | Government Debt | Flow Discounting Method | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 0
Investments in equity instruments designated at fair value through other comprehensive income | Equity Instruments | Price Based Valuation Technique | Minimum
Disclosure of detailed information about financial instruments [line items]
Price, assets (as a percent)	90.00%
Investments in equity instruments designated at fair value through other comprehensive income | Equity Instruments | Price Based Valuation Technique | Maximum
Disclosure of detailed information about financial instruments [line items]
Price, assets (as a percent)	110.00%
Investments in equity instruments designated at fair value through other comprehensive income | Equity Instruments | Price Based Valuation Technique | Weighted average
Disclosure of detailed information about financial instruments [line items]
Price, assets (as a percent)	10.00%
Investments in equity instruments designated at fair value through other comprehensive income | Equity Instruments | Price Based Valuation Technique | Unfavourable Scenario
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets	€ (106,400)
Investments in equity instruments designated at fair value through other comprehensive income | Equity Instruments | Price Based Valuation Technique | Favourable Scenario
Disclosure of detailed information about financial instruments [line items]
Increase in fair value of assets due to change in inputs	€ 106,400

Other disclosures - Changes in

Other disclosures - Changes in the financial instruments classified as Level 3 (Details) € in Millions	6 Months Ended
	Jun. 30, 2021EUR (€)
Changes in financial instruments, Liabilities
Liabilities at beginning of period	€ 905
Purchases/Settlements	27
Sales/Amortisation	(27)
Changes in fair value recognized in profit or loss	2
Changes in fair value recognised in equity	0
Level reclassifications (out of) Level 3	(314)
Other	30
Liabilities at end of period	623
Level 3
Changes in financial instruments, Assets
Assets at beginning of period	8,543
Purchases/Issuances	3,158
Sales/Settlements	(3,157)
Changes in fair value recognized in profit or loss	(9)
Changes in fair value recognized in equity	(127)
Level reclassifications into Level 3	33
Other	93
Assets at end of period	8,534
Changes in financial instruments, Liabilities
Liabilities at beginning of period	905
Liabilities at end of period	623
Financial liabilities held for trading | Level 3
Changes in financial instruments, Liabilities
Liabilities at beginning of period	295
Purchases/Settlements	27
Sales/Amortisation	(27)
Changes in fair value recognized in profit or loss	(23)
Changes in fair value recognised in equity	0
Level reclassifications (out of) Level 3	(25)
Other	9
Liabilities at end of period	256
Financial liabilities held for trading | Derivatives | Level 3
Changes in financial instruments, Liabilities
Liabilities at beginning of period	295
Purchases/Settlements	27
Sales/Amortisation	(27)
Changes in fair value recognized in profit or loss	(23)
Changes in fair value recognised in equity	0
Level reclassifications (out of) Level 3	(25)
Other	9
Liabilities at end of period	256
Financial liabilities held for trading | Swaps | Level 3
Changes in financial instruments, Liabilities
Liabilities at beginning of period	81
Purchases/Settlements	3
Sales/Amortisation	(3)
Changes in fair value recognized in profit or loss	(19)
Changes in fair value recognised in equity	0
Level reclassifications (out of) Level 3	(4)
Other	(1)
Liabilities at end of period	57
Financial liabilities held for trading | Exchange rate options | Level 3
Changes in financial instruments, Liabilities
Liabilities at beginning of period	1
Purchases/Settlements	0
Sales/Amortisation	0
Changes in fair value recognized in profit or loss	21
Changes in fair value recognised in equity	0
Other	1
Liabilities at end of period	23
Financial liabilities held for trading | Interest rate options | Level 3
Changes in financial instruments, Liabilities
Liabilities at beginning of period	49
Purchases/Settlements	6
Sales/Amortisation	(13)
Changes in fair value recognized in profit or loss	(6)
Changes in fair value recognised in equity	0
Other	0
Liabilities at end of period	36
Financial liabilities held for trading | Index and securities options | Level 3
Changes in financial instruments, Liabilities
Liabilities at beginning of period	97
Purchases/Settlements	16
Sales/Amortisation	(4)
Changes in fair value recognized in profit or loss	34
Changes in fair value recognised in equity	0
Level reclassifications (out of) Level 3	(21)
Other	10
Liabilities at end of period	132
Financial liabilities held for trading | Interest rate and equity futures | Level 3
Changes in financial instruments, Liabilities
Liabilities at beginning of period	2
Purchases/Settlements	0
Sales/Amortisation	(2)
Changes in fair value recognized in profit or loss	0
Changes in fair value recognised in equity	0
Other	0
Liabilities at end of period	0
Financial liabilities held for trading | Other | Level 3
Changes in financial instruments, Liabilities
Liabilities at beginning of period	65
Purchases/Settlements	2
Sales/Amortisation	(5)
Changes in fair value recognized in profit or loss	(53)
Changes in fair value recognised in equity	0
Other	(1)
Liabilities at end of period	8
Financial liabilities designated at fair value through profit or loss | Level 3
Changes in financial instruments, Liabilities
Liabilities at beginning of period	610
Purchases/Settlements	0
Sales/Amortisation	0
Changes in fair value recognized in profit or loss	25
Changes in fair value recognised in equity	0
Level reclassifications (out of) Level 3	(289)
Other	21
Liabilities at end of period	367
Financial assets held for trading, category | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	740
Purchases/Issuances	67
Sales/Settlements	(91)
Changes in fair value recognized in profit or loss	(51)
Changes in fair value recognized in equity	0
Level reclassifications (out of) Level 3	(59)
Other	5
Assets at end of period	611
Financial assets held for trading, category | Debt instruments asset | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	7
Purchases/Issuances	17
Sales/Settlements	(2)
Changes in fair value recognized in profit or loss	(3)
Changes in fair value recognized in equity	0
Other	0
Assets at end of period	19
Financial assets held for trading, category | Derivatives | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	730
Purchases/Issuances	50
Sales/Settlements	(88)
Changes in fair value recognized in profit or loss	(49)
Changes in fair value recognized in equity	0
Level reclassifications (out of) Level 3	(59)
Other	5
Assets at end of period	589
Financial assets held for trading, category | Swaps | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	272
Purchases/Issuances	5
Sales/Settlements	(12)
Changes in fair value recognized in profit or loss	(29)
Changes in fair value recognized in equity	0
Level reclassifications (out of) Level 3	(1)
Other	(2)
Assets at end of period	233
Financial assets held for trading, category | Exchange rate options | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	22
Purchases/Issuances	14
Sales/Settlements	(27)
Changes in fair value recognized in profit or loss	24
Changes in fair value recognized in equity	0
Other	0
Assets at end of period	33
Financial assets held for trading, category | Interest rate options | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	241
Purchases/Issuances	7
Sales/Settlements	(39)
Changes in fair value recognized in profit or loss	(24)
Changes in fair value recognized in equity	0
Other	0
Assets at end of period	185
Financial assets held for trading, category | Index and securities options | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	94
Purchases/Issuances	11
Sales/Settlements	(4)
Changes in fair value recognized in profit or loss	20
Changes in fair value recognized in equity	0
Level reclassifications (out of) Level 3	(59)
Other	4
Assets at end of period	66
Financial assets held for trading, category | Other | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	101
Purchases/Issuances	13
Sales/Settlements	(6)
Changes in fair value recognized in profit or loss	(40)
Changes in fair value recognized in equity	0
Level reclassifications into Level 3	1
Other	3
Assets at end of period	72
Financial assets held for trading, category | Equity Instruments | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	3
Purchases/Issuances	0
Sales/Settlements	(1)
Changes in fair value recognized in profit or loss	1
Changes in fair value recognized in equity	0
Other	0
Assets at end of period	3
Non-trading financial assets mandatorily at fair value through profit or loss | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	934
Purchases/Issuances	97
Sales/Settlements	(114)
Changes in fair value recognized in profit or loss	7
Changes in fair value recognized in equity	0
Level reclassifications into Level 3	515
Other	30
Assets at end of period	1,469
Non-trading financial assets mandatorily at fair value through profit or loss | Debt instruments asset | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	134
Purchases/Issuances	0
Sales/Settlements	(11)
Changes in fair value recognized in profit or loss	6
Changes in fair value recognized in equity	0
Level reclassifications into Level 3	12
Other	9
Assets at end of period	150
Non-trading financial assets mandatorily at fair value through profit or loss | Loans and advances - Customers | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	295
Purchases/Issuances	56
Sales/Settlements	(71)
Changes in fair value recognized in profit or loss	(18)
Changes in fair value recognized in equity	0
Other	4
Assets at end of period	266
Non-trading financial assets mandatorily at fair value through profit or loss | Equity instruments | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	505
Purchases/Issuances	41
Sales/Settlements	(32)
Changes in fair value recognized in profit or loss	19
Changes in fair value recognized in equity	0
Level reclassifications into Level 3	503
Other	17
Assets at end of period	1,053
Financial assets designated at fair value through profit or loss, category | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	649
Purchases/Issuances	53
Sales/Settlements	(127)
Changes in fair value recognized in profit or loss	35
Changes in fair value recognized in equity	0
Level reclassifications (out of) Level 3	(163)
Other	31
Assets at end of period	478
Financial assets designated at fair value through profit or loss, category | Debt instruments asset | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	467
Purchases/Issuances	53
Sales/Settlements	(125)
Changes in fair value recognized in profit or loss	35
Changes in fair value recognized in equity	0
Level reclassifications (out of) Level 3	0
Other	31
Assets at end of period	461
Financial assets designated at fair value through profit or loss, category | Loans and advances - Credit institutions | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	163
Purchases/Issuances	0
Sales/Settlements	0
Changes in fair value recognized in profit or loss	0
Changes in fair value recognized in equity	0
Level reclassifications (out of) Level 3	(163)
Other	0
Assets at end of period	0
Financial assets designated at fair value through profit or loss, category | Loans and advances - Customers | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	19
Purchases/Issuances	0
Sales/Settlements	(2)
Changes in fair value recognized in profit or loss	0
Changes in fair value recognized in equity	0
Other	0
Assets at end of period	17
Financial assets at fair value through other comprehensive income | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	6,220
Purchases/Issuances	2,941
Sales/Settlements	(2,825)
Changes in fair value recognized in profit or loss	0
Changes in fair value recognized in equity	(127)
Level reclassifications (out of) Level 3	(260)
Other	27
Assets at end of period	5,976
Financial assets at fair value through other comprehensive income | Debt instruments asset | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	206
Purchases/Issuances	74
Sales/Settlements	(25)
Changes in fair value recognized in equity	40
Level reclassifications (out of) Level 3	(68)
Other	17
Assets at end of period	244
Financial assets at fair value through other comprehensive income | Loans and advances - Customers | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	4,792
Purchases/Issuances	2,865
Sales/Settlements	(2,782)
Changes in fair value recognized in equity	(18)
Level reclassifications (out of) Level 3	(192)
Other	3
Assets at end of period	4,668
Financial assets at fair value through other comprehensive income | Equity instruments | Level 3
Changes in financial instruments, Assets
Assets at beginning of period	1,222
Purchases/Issuances	2
Sales/Settlements	(18)
Changes in fair value recognized in equity	(149)
Other	7
Assets at end of period	€ 1,064

Other disclosures - Exposure to

Other disclosures - Exposure to Europe's peripheral countries (Details) - Sovereign Risk - EUR (€) € in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Debt Instruments
Off-balance-sheet government debt securities	€ 13,450	€ 14,241
Off-balance-sheet other than derivatives contingent liabilities and commitments	4,989	6,134
Spain
Debt Instruments
Risk exposure	19,241	24,245
Off-balance-sheet government debt securities	11,804	12,571
Off-balance-sheet other than derivatives contingent liabilities and commitments	4,649	5,509
PORTUGAL
Debt Instruments
Risk exposure	7,115	8,730
Off-balance-sheet government debt securities	1,164	1,281
Off-balance-sheet other than derivatives contingent liabilities and commitments	286	345
ITALY
Debt Instruments
Risk exposure	4,544	4,015
Off-balance-sheet government debt securities	470	387
Off-balance-sheet other than derivatives contingent liabilities and commitments	54	280
IRELAND
Debt Instruments
Risk exposure	0	0
Off-balance-sheet government debt securities	12	2
Debt instruments asset | Spain
Debt Instruments
Risk exposure effect of short positions	(5,146)	(5,665)
Debt instruments asset | PORTUGAL
Debt Instruments
Risk exposure effect of short positions	(205)	(582)
Debt instruments asset | ITALY
Debt Instruments
Risk exposure effect of short positions	(1,171)	(307)
Debt instruments asset | IRELAND
Debt Instruments
Risk exposure effect of short positions	0	0
Loans and advances - Customers
Debt Instruments
Risk exposure, valuation adjustment	17	23
Loans and advances - Customers | Spain
Debt Instruments
Risk exposure	13,022	12,104
Loans and advances - Customers | PORTUGAL
Debt Instruments
Risk exposure	4,231	4,331
Loans and advances - Customers | ITALY
Debt Instruments
Risk exposure	17	21
Loans and advances - Customers | IRELAND
Debt Instruments
Risk exposure	0	0
Financial assets held for trading and financial assets designated at fair value through profit or loss | Debt instruments asset | Spain
Debt Instruments
Risk exposure - long positions	7,427	9,765
Financial assets held for trading and financial assets designated at fair value through profit or loss | Debt instruments asset | PORTUGAL
Debt Instruments
Risk exposure - long positions	243	202
Financial assets held for trading and financial assets designated at fair value through profit or loss | Debt instruments asset | ITALY
Debt Instruments
Risk exposure - long positions	1,765	556
Financial assets held for trading and financial assets designated at fair value through profit or loss | Debt instruments asset | IRELAND
Debt Instruments
Risk exposure - long positions	0	0
Financial assets at fair value through other comprehensive income | Debt instruments asset | Spain
Debt Instruments
Risk exposure	2,928	7,048
Financial assets at fair value through other comprehensive income | Debt instruments asset | PORTUGAL
Debt Instruments
Risk exposure	2,299	4,148
Financial assets at fair value through other comprehensive income | Debt instruments asset | ITALY
Debt Instruments
Risk exposure	3,882	2,468
Financial assets at fair value through other comprehensive income | Debt instruments asset | IRELAND
Debt Instruments
Risk exposure	0	0
Non-trading financial assets mandatorily at fair value through profit or loss | Debt instruments asset | Spain
Debt Instruments
Risk exposure	0	0
Non-trading financial assets mandatorily at fair value through profit or loss | Debt instruments asset | PORTUGAL
Debt Instruments
Risk exposure	0	0
Non-trading financial assets mandatorily at fair value through profit or loss | Debt instruments asset | ITALY
Debt Instruments
Risk exposure	0	0
Non-trading financial assets mandatorily at fair value through profit or loss | Debt instruments asset | IRELAND
Debt Instruments
Risk exposure	0	0
Financial assets at amortised cost | Debt instruments asset | Spain
Debt Instruments
Risk exposure	1,010	993
Financial assets at amortised cost | Debt instruments asset | PORTUGAL
Debt Instruments
Risk exposure	547	631
Financial assets at amortised cost | Debt instruments asset | ITALY
Debt Instruments
Risk exposure	51	1,277
Financial assets at amortised cost | Debt instruments asset | IRELAND
Debt Instruments
Risk exposure	0	0
Hedging derivatives, category | Other Than Credit Default Swaps | Spain
Debt Instruments
Risk exposure	326	546
Hedging derivatives, category | Other Than Credit Default Swaps | PORTUGAL
Debt Instruments
Risk exposure	0	0
Hedging derivatives, category | Other Than Credit Default Swaps | ITALY
Debt Instruments
Risk exposure	1	1
Hedging derivatives, category | Other Than Credit Default Swaps | IRELAND
Debt Instruments
Risk exposure	0	0
Hedging derivatives, category | Credit default swap | Spain
Debt Instruments
Risk exposure effect of short positions	0	0
Hedging derivatives, category | Credit default swap | PORTUGAL
Debt Instruments
Risk exposure effect of short positions	0	0
Hedging derivatives, category | Credit default swap | ITALY
Debt Instruments
Risk exposure effect of short positions	(1)	(1)
Hedging derivatives, category | Credit default swap | IRELAND
Debt Instruments
Risk exposure effect of short positions	€ 0	€ 0

Other disclosures - Other expos

Other disclosures - Other exposure to other counterparties (Details) - Other Counterparties Risk - EUR (€) € in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Spain
Debt Instruments
Risk exposure	€ 277,037	€ 270,674
Off-balance-sheet other than derivatives contingent liabilities and commitments	77,418	76,377
PORTUGAL
Debt Instruments
Risk exposure	45,740	41,967
Off-balance-sheet other than derivatives contingent liabilities and commitments	8,392	8,591
ITALY
Debt Instruments
Risk exposure	23,497	21,592
Off-balance-sheet other than derivatives contingent liabilities and commitments	6,318	4,173
GREECE
Debt Instruments
Risk exposure	18	14
Off-balance-sheet other than derivatives contingent liabilities and commitments		200
IRELAND
Debt Instruments
Risk exposure	15,881	13,447
Off-balance-sheet other than derivatives contingent liabilities and commitments	975	797
Cash, Cash Balance At Central Banks And Other Deposits On Demand | Spain
Debt Instruments
Risk exposure	68,708	62,023
Cash, Cash Balance At Central Banks And Other Deposits On Demand | PORTUGAL
Debt Instruments
Risk exposure	6,922	3,937
Cash, Cash Balance At Central Banks And Other Deposits On Demand | ITALY
Debt Instruments
Risk exposure	321	10
Cash, Cash Balance At Central Banks And Other Deposits On Demand | GREECE
Debt Instruments
Risk exposure	0	0
Cash, Cash Balance At Central Banks And Other Deposits On Demand | IRELAND
Debt Instruments
Risk exposure	0	0
Reverse repurchase agreements | Spain
Debt Instruments
Risk exposure	3,574	3,837
Reverse repurchase agreements | PORTUGAL
Debt Instruments
Risk exposure	0	0
Reverse repurchase agreements | ITALY
Debt Instruments
Risk exposure	7,340	7,098
Reverse repurchase agreements | GREECE
Debt Instruments
Risk exposure	0	0
Reverse repurchase agreements | IRELAND
Debt Instruments
Risk exposure	176	0
Loans and advances - Customers
Debt Instruments
Risk exposure, valuation adjustment	8,084	8,129
Loans and advances - Customers | Spain
Debt Instruments
Risk exposure	202,824	203,226
Loans and advances - Customers | PORTUGAL
Debt Instruments
Risk exposure	35,647	34,935
Loans and advances - Customers | ITALY
Debt Instruments
Risk exposure	14,794	13,437
Loans and advances - Customers | GREECE
Debt Instruments
Risk exposure	18	14
Loans and advances - Customers | IRELAND
Debt Instruments
Risk exposure	11,556	10,523
Financial assets held for trading and financial assets designated at fair value through profit or loss | Debt instruments asset | Spain
Debt Instruments
Risk exposure	456	619
Financial assets held for trading and financial assets designated at fair value through profit or loss | Debt instruments asset | PORTUGAL
Debt Instruments
Risk exposure	187	140
Financial assets held for trading and financial assets designated at fair value through profit or loss | Debt instruments asset | ITALY
Debt Instruments
Risk exposure	342	425
Financial assets held for trading and financial assets designated at fair value through profit or loss | Debt instruments asset | GREECE
Debt Instruments
Risk exposure	0	0
Financial assets held for trading and financial assets designated at fair value through profit or loss | Debt instruments asset | IRELAND
Debt Instruments
Risk exposure	68	22
Financial assets at fair value through other comprehensive income | Debt instruments asset | Spain
Debt Instruments
Risk exposure	903	943
Financial assets at fair value through other comprehensive income | Debt instruments asset | PORTUGAL
Debt Instruments
Risk exposure	29	22
Financial assets at fair value through other comprehensive income | Debt instruments asset | ITALY
Debt Instruments
Risk exposure	553	493
Financial assets at fair value through other comprehensive income | Debt instruments asset | GREECE
Debt Instruments
Risk exposure	0	0
Financial assets at fair value through other comprehensive income | Debt instruments asset | IRELAND
Debt Instruments
Risk exposure	2,756	2,337
Non-trading financial assets mandatorily at fair value through profit or loss | Debt instruments asset | Spain
Debt Instruments
Risk exposure	82	2
Non-trading financial assets mandatorily at fair value through profit or loss | Debt instruments asset | PORTUGAL
Debt Instruments
Risk exposure	0	0
Non-trading financial assets mandatorily at fair value through profit or loss | Debt instruments asset | ITALY
Debt Instruments
Risk exposure	0	0
Non-trading financial assets mandatorily at fair value through profit or loss | Debt instruments asset | GREECE
Debt Instruments
Risk exposure	0	0
Non-trading financial assets mandatorily at fair value through profit or loss | Debt instruments asset | IRELAND
Debt Instruments
Risk exposure	591	556
Financial assets at amortised cost | Debt instruments asset | Spain
Debt Instruments
Risk exposure	490	24
Financial assets at amortised cost | Debt instruments asset | PORTUGAL
Debt Instruments
Risk exposure	2,955	2,933
Financial assets at amortised cost | Debt instruments asset | ITALY
Debt Instruments
Risk exposure	147	129
Financial assets at amortised cost | Debt instruments asset | GREECE
Debt Instruments
Risk exposure	0	0
Financial assets at amortised cost | Debt instruments asset | IRELAND
Debt Instruments
Risk exposure	734	9
Hedging derivatives, category | Other Than Credit Default Swaps | Spain
Debt Instruments
Risk exposure	1,213	2,581
Hedging derivatives, category | Other Than Credit Default Swaps | PORTUGAL
Debt Instruments
Risk exposure	520	685
Hedging derivatives, category | Other Than Credit Default Swaps | ITALY
Debt Instruments
Risk exposure	510	1,001
Hedging derivatives, category | Other Than Credit Default Swaps | GREECE
Debt Instruments
Risk exposure	0	0
Hedging derivatives, category | Other Than Credit Default Swaps | IRELAND
Debt Instruments
Risk exposure	127	153
Hedging derivatives, category | Credit Default Swap | Spain
Debt Instruments
Risk exposure	(2)	(4)
Hedging derivatives, category | Credit Default Swap | PORTUGAL
Debt Instruments
Risk exposure	0	0
Hedging derivatives, category | Credit Default Swap | ITALY
Debt Instruments
Risk exposure	(4)	(4)
Hedging derivatives, category | Credit Default Swap | GREECE
Debt Instruments
Risk exposure	0	0
Hedging derivatives, category | Credit Default Swap | IRELAND
Debt Instruments
Risk exposure	€ 0	€ 0

Other disclosures - Credit defa

Other disclosures - Credit default swaps (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instruments
Financial liabilities, at fair value	€ (623)	€ (905)
Hedging derivatives, category | Spain | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	0	0
Financial assets, at fair value	0	0
Hedging derivatives, category | Spain | Bought | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	0	0
Financial assets, at fair value	0	0
Hedging derivatives, category | Spain | Bought | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	611	546
Financial liabilities, at fair value	(14)	(13)
Hedging derivatives, category | Spain | Sold | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	0	0
Financial assets, at fair value	0	0
Hedging derivatives, category | Spain | Sold | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	315	273
Financial assets, at fair value	12	9
Hedging derivatives, category | Spain | Net Bought Position | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	296	273
Hedging derivatives, category | Spain | Net Sold Position | Other Counterparties Risk | Credit default swap
Debt Instruments
Financial liabilities, at fair value	(2)	(4)
Hedging derivatives, category | PORTUGAL | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	0	0
Financial assets, at fair value	0	0
Hedging derivatives, category | PORTUGAL | Other Counterparties Risk | Credit default swap
Debt Instruments
Financial assets, at fair value	0	0
Hedging derivatives, category | PORTUGAL | Bought | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	0	0
Financial assets, at fair value	0	0
Hedging derivatives, category | PORTUGAL | Bought | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	52	52
Financial assets, at fair value	0	0
Hedging derivatives, category | PORTUGAL | Sold | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	0	0
Financial assets, at fair value	0	0
Hedging derivatives, category | PORTUGAL | Sold | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	0	0
Financial assets, at fair value	0	0
Hedging derivatives, category | PORTUGAL | Net Bought Position | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	52	52
Hedging derivatives, category | ITALY | Bought | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	327	326
Financial liabilities, at fair value	(2)	(3)
Hedging derivatives, category | ITALY | Bought | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	220	220
Financial liabilities, at fair value	(5)	(4)
Hedging derivatives, category | ITALY | Sold | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	205	206
Financial assets, at fair value	1	2
Hedging derivatives, category | ITALY | Sold | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	110	11
Financial assets, at fair value	1	0
Hedging derivatives, category | ITALY | Net Bought Position | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	122	120
Hedging derivatives, category | ITALY | Net Bought Position | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	110	209
Hedging derivatives, category | ITALY | Net Sold Position | Sovereign Risk | Credit default swap
Debt Instruments
Financial liabilities, at fair value	(1)	(1)
Hedging derivatives, category | ITALY | Net Sold Position | Other Counterparties Risk | Credit default swap
Debt Instruments
Financial liabilities, at fair value	(4)	€ (4)
Hedging derivatives, category | GREECE | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	0
Financial assets, at fair value	0
Hedging derivatives, category | GREECE | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	0
Financial assets, at fair value	0
Hedging derivatives, category | GREECE | Bought | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	0
Financial assets, at fair value	0
Hedging derivatives, category | GREECE | Bought | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	0
Financial assets, at fair value	0
Hedging derivatives, category | GREECE | Sold | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	0
Financial assets, at fair value	0
Hedging derivatives, category | GREECE | Sold | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	0
Financial assets, at fair value	0
Hedging derivatives, category | IRELAND | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	0
Financial assets, at fair value	0
Hedging derivatives, category | IRELAND | Other Counterparties Risk | Credit default swap
Debt Instruments
Financial assets, at fair value	0
Hedging derivatives, category | IRELAND | Bought | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	0
Financial assets, at fair value	0
Hedging derivatives, category | IRELAND | Bought | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	0
Financial assets, at fair value	0
Hedging derivatives, category | IRELAND | Sold | Sovereign Risk | Credit default swap
Debt Instruments
Notional amount	0
Financial assets, at fair value	0
Hedging derivatives, category | IRELAND | Sold | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	6
Financial assets, at fair value	0
Hedging derivatives, category | IRELAND | Net Sold Position | Other Counterparties Risk | Credit default swap
Debt Instruments
Notional amount	€ (6)

Other disclosures - Forborne Lo

Other disclosures - Forborne Loans (Details) - Credit risk - Forborne loan portfolio € in Millions	Jun. 30, 2021EUR (€)contract	Dec. 31, 2020EUR (€)
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 27,747	€ 20,997
Accumulated impairment
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ (8,364)
Without collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	3,125,257
Without collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 15,033
With property collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	483,656
With property collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 21,078
Real estate guarantee
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	12,759
Rest of real guarantees
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	4,229
Public sector | Accumulated impairment
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ (1)
Public sector | Without collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	27
Public sector | Without collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 20
Public sector | With property collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	17
Public sector | With property collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 6
Public sector | Real estate guarantee
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	4
Public sector | Rest of real guarantees
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	0
Other financial institutions (Financial business activity) | Accumulated impairment
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ (27)
Other financial institutions (Financial business activity) | Without collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	797
Other financial institutions (Financial business activity) | Without collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 37
Other financial institutions (Financial business activity) | With property collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	599
Other financial institutions (Financial business activity) | With property collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 211
Other financial institutions (Financial business activity) | Real estate guarantee
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	100
Other financial institutions (Financial business activity) | Rest of real guarantees
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	87
Non-financial corporations and individual entrepreneurs (Non-financial business activity) | Accumulated impairment
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ (4,668)
Non-financial corporations and individual entrepreneurs (Non-financial business activity) | Without collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	221,539
Non-financial corporations and individual entrepreneurs (Non-financial business activity) | Without collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 10,579
Non-financial corporations and individual entrepreneurs (Non-financial business activity) | With property collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	49,625
Non-financial corporations and individual entrepreneurs (Non-financial business activity) | With property collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 10,036
Non-financial corporations and individual entrepreneurs (Non-financial business activity) | Real estate guarantee
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	6,320
Non-financial corporations and individual entrepreneurs (Non-financial business activity) | Rest of real guarantees
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	1,217
Construction and property development | Accumulated impairment
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ (222)
Construction and property development | Without collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	7,543
Construction and property development | Without collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 133
Construction and property development | With property collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	1,276
Construction and property development | With property collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 621
Construction and property development | Real estate guarantee
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	408
Construction and property development | Rest of real guarantees
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	35
Other warehouses | Accumulated impairment
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ (3,668)
Other warehouses | Without collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	2,902,894
Other warehouses | Without collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 4,397
Other warehouses | With property collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	433,415
Other warehouses | With property collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 10,825
Other warehouses | Real estate guarantee
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	6,335
Other warehouses | Rest of real guarantees
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	2,925
Impaired | Accumulated impairment
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ (6,476)
Impaired | Without collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	1,520,745
Impaired | Without collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 5,581
Impaired | With property collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	170,831
Impaired | With property collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 10,253
Impaired | Real estate guarantee
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	6,759
Impaired | Rest of real guarantees
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	747
Impaired | Public sector | Accumulated impairment
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ (1)
Impaired | Public sector | Without collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	7
Impaired | Public sector | Without collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 1
Impaired | Public sector | With property collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	11
Impaired | Public sector | With property collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 2
Impaired | Public sector | Real estate guarantee
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	2
Impaired | Public sector | Rest of real guarantees
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	0
Impaired | Other financial institutions (Financial business activity) | Accumulated impairment
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ (24)
Impaired | Other financial institutions (Financial business activity) | Without collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	325
Impaired | Other financial institutions (Financial business activity) | Without collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 18
Impaired | Other financial institutions (Financial business activity) | With property collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	393
Impaired | Other financial institutions (Financial business activity) | With property collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 72
Impaired | Other financial institutions (Financial business activity) | Real estate guarantee
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	57
Impaired | Other financial institutions (Financial business activity) | Rest of real guarantees
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	11
Impaired | Non-financial corporations and individual entrepreneurs (Non-financial business activity) | Accumulated impairment
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ (4,188)
Impaired | Non-financial corporations and individual entrepreneurs (Non-financial business activity) | Without collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	100,297
Impaired | Non-financial corporations and individual entrepreneurs (Non-financial business activity) | Without collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 3,737
Impaired | Non-financial corporations and individual entrepreneurs (Non-financial business activity) | With property collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	34,456
Impaired | Non-financial corporations and individual entrepreneurs (Non-financial business activity) | With property collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 6,367
Impaired | Non-financial corporations and individual entrepreneurs (Non-financial business activity) | Real estate guarantee
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	3,997
Impaired | Non-financial corporations and individual entrepreneurs (Non-financial business activity) | Rest of real guarantees
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	425
Impaired | Construction and property development | Accumulated impairment
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ (201)
Impaired | Construction and property development | Without collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	3,901
Impaired | Construction and property development | Without collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 45
Impaired | Construction and property development | With property collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	811
Impaired | Construction and property development | With property collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 411
Impaired | Construction and property development | Real estate guarantee
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	218
Impaired | Construction and property development | Rest of real guarantees
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	31
Impaired | Other warehouses | Accumulated impairment
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ (2,263)
Impaired | Other warehouses | Without collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	1,420,116
Impaired | Other warehouses | Without collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 1,825
Impaired | Other warehouses | With property collateral
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Number of transactions | contract	135,971
Impaired | Other warehouses | With property collateral | Gross carrying amount
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Loans and receivables	€ 3,812
Impaired | Other warehouses | Real estate guarantee
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	2,703
Impaired | Other warehouses | Rest of real guarantees
CURRENT REFINANCING AND RESTRUCTURING BALANCES
Maximum amount of the actual collateral that can be considered	€ 311

Other disclosures - Forborne _2

Other disclosures - Forborne Loans Roll Forward (Details) - Credit risk - Forborne loan portfolio € in Millions	6 Months Ended
	Jun. 30, 2021EUR (€)
Changes in the portfolio
Beginning balance	€ 20,997
Refinancing and restructuring of the period	10,543
Memorandum item: Impact recorded in the income statement for the period	1,078
Debt repayment	(2,659)
Foreclosure	(161)
Derecognized from the consolidated balance sheet	(537)
Other changes	(436)
Balance at end of year	€ 27,747

Other disclosures - Spain Home

Other disclosures - Spain Home Purchase Loans (Details) - Home purchase loans - Spain - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Credit risk
Percentage secured by mortgage	99.35%
Gross carrying amount
Credit risk
Financial assets	€ 60,462	€ 59,605
Weighted average
Credit risk
Affordability Rate	26.38%
Less Than 80 %
Credit risk
Percentage of portfolio with LTV less than 80%	87.49%
Less Than 80 % | Maximum
Credit risk
Loan-to-value (LTV) ratio (in percentage)	80.00%
Impaired | Gross carrying amount
Credit risk
Financial assets	€ 1,827	1,850
Without collateral | Gross carrying amount
Credit risk
Financial assets	396	387
Without collateral | Impaired | Gross carrying amount
Credit risk
Financial assets	82	75
With property collateral | Gross carrying amount
Credit risk
Financial assets	60,066	59,218
With property collateral | Less than or equal to 40% | Gross carrying amount
Credit risk
Financial assets	15,759	15,570
With property collateral | More than 40% and less than or equal to 60% | Gross carrying amount
Credit risk
Financial assets	18,383	18,028
With property collateral | More than 60% and less than or equal to 80% | Gross carrying amount
Credit risk
Financial assets	18,408	17,585
With property collateral | More than 80% and less than or equal to 100% | Gross carrying amount
Credit risk
Financial assets	4,920	5,205
With property collateral | More than 100% | Gross carrying amount
Credit risk
Financial assets	2,596	2,830
With property collateral | Impaired | Gross carrying amount
Credit risk
Financial assets	1,745	1,775
With property collateral | Impaired | Less than or equal to 40% | Gross carrying amount
Credit risk
Financial assets	170	170
With property collateral | Impaired | More than 40% and less than or equal to 60% | Gross carrying amount
Credit risk
Financial assets	218	222
With property collateral | Impaired | More than 60% and less than or equal to 80% | Gross carrying amount
Credit risk
Financial assets	304	318
With property collateral | Impaired | More than 80% and less than or equal to 100% | Gross carrying amount
Credit risk
Financial assets	307	305
With property collateral | Impaired | More than 100% | Gross carrying amount
Credit risk
Financial assets	€ 746	€ 760

Other disclosures - Spain Real

Other disclosures - Spain Real Estate Business: gross, collateral, allowance (Details) - Spain - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Accumulated impairment
Distribution of portfolio
Financial assets	€ (1,560)	€ (1,591)
Construction and property development
Distribution of portfolio
Financial assets	2,701	2,801
Construction and property development | Gross carrying amount
Distribution of portfolio
Financial assets	2,772	2,871
Written-off assets	844	924
Construction and property development | Gross carrying amount | Impaired
Distribution of portfolio
Financial assets	189	176
Construction and property development | Excess over collateral value
Distribution of portfolio
Excess over collateral value	386	397
Written-off assets
Construction and property development | Excess over collateral value | Impaired
Distribution of portfolio
Excess over collateral value	38	20
Construction and property development | Accumulated impairment
Distribution of portfolio
Financial assets	(71)	(70)
Written-off assets
Construction and property development | Accumulated impairment | Impaired
Distribution of portfolio
Financial assets	€ (54)	€ (58)

Other disclosures - Spain Rea_2

Other disclosures - Spain Real Estate Business Segment Information (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Memorandum items: Data from the public consolidated balance sheet
Total assets	€ 1,568,636	€ 1,508,250
Spain
Memorandum items: Data from the public consolidated balance sheet
Total assets	1,568,636	1,508,250
Spain | Accumulated impairment
Memorandum items: Data from the public consolidated balance sheet
Financial assets	1,560	1,591
Spain | Customers excluding the public sector
Memorandum items: Data from the public consolidated balance sheet
Total loans and advances to customers excluding the public sector (business in Spain)	€ 239,941	€ 237,165

Other disclosures - Spain Rea_3

Other disclosures - Spain Real Estate Business Concentration Information (Details) - Construction and property development - Spain - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Distribution of portfolio
Financial assets	€ 2,701	€ 2,801
Gross carrying amount
Distribution of portfolio
Financial assets	2,772	2,871
Gross carrying amount | Without collateral
Distribution of portfolio
Financial assets	183	164
Gross carrying amount | With property collateral
Distribution of portfolio
Financial assets	2,589	2,707
Gross carrying amount | Buildings | With property collateral
Distribution of portfolio
Financial assets	1,445	1,454
Gross carrying amount | Buildings | Residential Property Collateral
Distribution of portfolio
Financial assets	866	844
Gross carrying amount | Buildings | Non-residential Property Collateral
Distribution of portfolio
Financial assets	579	610
Gross carrying amount | Construction in progress | With property collateral
Distribution of portfolio
Financial assets	1,082	1,185
Gross carrying amount | Construction in progress | Residential Property Collateral
Distribution of portfolio
Financial assets	1,038	1,124
Gross carrying amount | Construction in progress | Non-residential Property Collateral
Distribution of portfolio
Financial assets	44	61
Gross carrying amount | Land | With property collateral
Distribution of portfolio
Financial assets	62	68
Gross carrying amount | Land | Developed Land Collateral
Distribution of portfolio
Financial assets	41	44
Gross carrying amount | Land | Undeveloped Land Collateral
Distribution of portfolio
Financial assets	€ 21	€ 24

Other disclosures - Foreclosed

Other disclosures - Foreclosed real estate assets (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Distribution of portfolio
Investments accounted for using equity method	€ 7,562	€ 7,622
Spain
Distribution of portfolio
Foreclosed assets	3,865	3,962
Impairment losses since time of foreclosure	2,787	2,834
Spain | Foreclosed Properties | Project Quasar Investments 2017, S.L.
Distribution of portfolio
Investments accounted for using equity method	707
Spain | Foreclosed Equity Instruments
Distribution of portfolio
Investments accounted for using equity method	38
Spain | Construction and property development
Distribution of portfolio
Foreclosed assets	3,159	3,242
Impairment losses since time of foreclosure	2,517	2,563
Spain | Construction and property development | Real Estate Assets, Completed Buildings
Distribution of portfolio
Foreclosed assets	1,252	1,294
Impairment losses since time of foreclosure	625	644
Spain | Construction and property development | Real Estate Assets, Completed Buildings, Residential
Distribution of portfolio
Foreclosed assets	372	356
Impairment losses since time of foreclosure	131	130
Spain | Construction and property development | Real Estate Assets, Completed Buildings, Non-residential
Distribution of portfolio
Foreclosed assets	880	938
Impairment losses since time of foreclosure	494	514
Spain | Construction and property development | Real Estate Assets, Buildings Under Construction
Distribution of portfolio
Foreclosed assets	64	108
Impairment losses since time of foreclosure	17	36
Spain | Construction and property development | Real Estate Assets, Buildings Under Construction, Residential
Distribution of portfolio
Foreclosed assets	64	108
Impairment losses since time of foreclosure	17	36
Spain | Construction and property development | Real Estate Assets, Buildings Under Construction, Non-residential
Distribution of portfolio
Foreclosed assets	0	0
Impairment losses since time of foreclosure	0	0
Spain | Construction and property development | Real Estate Assets, Land
Distribution of portfolio
Foreclosed assets	1,843	1,840
Impairment losses since time of foreclosure	1,875	1,883
Spain | Construction and property development | Real Estate Assets, Developed Land
Distribution of portfolio
Foreclosed assets	728	768
Impairment losses since time of foreclosure	522	559
Spain | Construction and property development | Real Estate Assets, Undeveloped Land
Distribution of portfolio
Foreclosed assets	1,115	1,072
Impairment losses since time of foreclosure	1,353	1,324
Spain | Home purchase loans
Distribution of portfolio
Foreclosed assets	580	587
Impairment losses since time of foreclosure	201	200
Spain | Other loans
Distribution of portfolio
Foreclosed assets	126	133
Impairment losses since time of foreclosure	69	71
Spain | Gross carrying amount
Distribution of portfolio
Foreclosed assets	7,754	7,937
Spain | Gross carrying amount | Construction and property development
Distribution of portfolio
Foreclosed assets	6,649	6,810
Spain | Gross carrying amount | Construction and property development | Real Estate Assets, Completed Buildings
Distribution of portfolio
Foreclosed assets	2,075	2,140
Spain | Gross carrying amount | Construction and property development | Real Estate Assets, Completed Buildings, Residential
Distribution of portfolio
Foreclosed assets	554	527
Spain | Gross carrying amount | Construction and property development | Real Estate Assets, Completed Buildings, Non-residential
Distribution of portfolio
Foreclosed assets	1,521	1,613
Spain | Gross carrying amount | Construction and property development | Real Estate Assets, Buildings Under Construction
Distribution of portfolio
Foreclosed assets	90	178
Spain | Gross carrying amount | Construction and property development | Real Estate Assets, Buildings Under Construction, Residential
Distribution of portfolio
Foreclosed assets	90	178
Spain | Gross carrying amount | Construction and property development | Real Estate Assets, Buildings Under Construction, Non-residential
Distribution of portfolio
Foreclosed assets	0	0
Spain | Gross carrying amount | Construction and property development | Real Estate Assets, Land
Distribution of portfolio
Foreclosed assets	4,484	4,492
Spain | Gross carrying amount | Construction and property development | Real Estate Assets, Developed Land
Distribution of portfolio
Foreclosed assets	1,578	1,656
Spain | Gross carrying amount | Construction and property development | Real Estate Assets, Undeveloped Land
Distribution of portfolio
Foreclosed assets	2,906	2,836
Spain | Gross carrying amount | Home purchase loans
Distribution of portfolio
Foreclosed assets	884	892
Spain | Gross carrying amount | Other loans
Distribution of portfolio
Foreclosed assets	221	235
Spain | Accumulated impairment
Distribution of portfolio
Foreclosed assets	(3,889)	(3,975)
Spain | Accumulated impairment | Construction and property development
Distribution of portfolio
Foreclosed assets	(3,490)	(3,568)
Spain | Accumulated impairment | Construction and property development | Real Estate Assets, Completed Buildings
Distribution of portfolio
Foreclosed assets	(823)	(846)
Spain | Accumulated impairment | Construction and property development | Real Estate Assets, Completed Buildings, Residential
Distribution of portfolio
Foreclosed assets	(182)	(171)
Spain | Accumulated impairment | Construction and property development | Real Estate Assets, Completed Buildings, Non-residential
Distribution of portfolio
Foreclosed assets	(641)	(675)
Spain | Accumulated impairment | Construction and property development | Real Estate Assets, Buildings Under Construction
Distribution of portfolio
Foreclosed assets	(26)	(70)
Spain | Accumulated impairment | Construction and property development | Real Estate Assets, Buildings Under Construction, Residential
Distribution of portfolio
Foreclosed assets	(26)	(70)
Spain | Accumulated impairment | Construction and property development | Real Estate Assets, Buildings Under Construction, Non-residential
Distribution of portfolio
Foreclosed assets	0	0
Spain | Accumulated impairment | Construction and property development | Real Estate Assets, Land
Distribution of portfolio
Foreclosed assets	(2,641)	(2,652)
Spain | Accumulated impairment | Construction and property development | Real Estate Assets, Developed Land
Distribution of portfolio
Foreclosed assets	(850)	(888)
Spain | Accumulated impairment | Construction and property development | Real Estate Assets, Undeveloped Land
Distribution of portfolio
Foreclosed assets	(1,791)	(1,764)
Spain | Accumulated impairment | Home purchase loans
Distribution of portfolio
Foreclosed assets	(304)	(305)
Spain | Accumulated impairment | Other loans
Distribution of portfolio
Foreclosed assets	€ (95)	€ (102)

Other disclosures - Capital Ris

Other disclosures - Capital Risk (Details)	Jun. 30, 2021	Dec. 31, 2020
IFRS Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 phase-in percentage	12.11%	12.34%
Tier 1 phase in capital ratio	13.67%	13.95%
Total phase-in capital	15.82%	16.18%
Minimum
IFRS Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 phase-in percentage	8.86%
Pillar 1 percentage	4.50%
Pillar 2 percentage	0.84%
Capital conservation buffer, percentage	2.50%
Globally Systemically Important Entity percentage	1.00%
Percentage of anti cyclical buffer on common equity Tier1 capital	0.01%
Tier 1 phase in capital ratio	10.64%
Maximum
IFRS Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 phase in capital ratio	13.01%

Other disclosures - Capital Rat

Other disclosures - Capital Ratio (Details) - EUR (€) € in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Other disclosures
Level 1 ordinary eligible capital (millions of euros)	€ 70,864	€ 69,399
Level 1 additional eligible capital (millions of euros)	9,109	9,102
Level 2 eligible capital (millions of euros)	12,567	12,514
Risk-weighted assets (million euros)	€ 584,999	€ 562,580
Level 1 ordinary capital coefficient (CET 1) (as a percent)	12.11%	12.34%
Level 1 additional capital coefficient (AT1) (as a percent)	1.56%	1.61%
Level 1 phase in capital ratio (as a percent)	13.67%	13.95%
Level 2 capital coefficient (TIER 2) (as a percent)	2.15%	2.23%
Total capital coefficient (as a percent)	15.82%	16.18%

Other disclosures - Leverage (D

Other disclosures - Leverage (Details) - EUR (€) € in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
IFRS Leverage Ratios [Abstract]
Level 1 Capital (millions of euros)	€ 79,973	€ 78,501
Exposure (millions of euros)	€ 1,545,183	€ 1,471,480
Leverage Ratio (as a percent)	5.18%	5.33%

Additional disclosure require_3

Additional disclosure requirements - Parent-Only Balance Sheets (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	€ 160,991		€ 114,253
Trading account assets	102,792	€ 114,945
Premises and equipment, net	31,712	31,772
Other assets	9,889	11,070
TOTAL ASSETS	1,568,636	1,508,250
LIABILITIES
OTHER LIABILITIES	11,777	12,336
TOTAL LIABILITIES	1,472,891	1,416,928
SHAREHOLDERS´ EQUITY
Share capital	8,670	8,670
TOTAL EQUITY	95,745	91,322	€ 91,859	€ 110,659
TOTAL LIABILITIES AND EQUITY	1,568,636	1,508,250
Banco Santander S.A. | Reportable Legal Entities
ASSETS
Cash and due from banks	136,068	112,114
Trading account assets	75,734	81,433
Investment securities	39,518	29,477
Net Loans and leases	303,950	295,739
Investment in affiliated companies	86,631	84,890
Premises and equipment, net	6,469	6,680
Other assets	16,439	19,036
TOTAL ASSETS	664,809	629,369
LIABILITIES
Deposits	404,072	383,135
Short-term debt	32,544	14,513
Long-term debt	86,560	83,981
Total debt	119,104	98,494
OTHER LIABILITIES	76,873	82,803
TOTAL LIABILITIES	600,049	564,432
SHAREHOLDERS´ EQUITY
Share capital	8,670	8,670
Retained earnings and other reserves	56,090	56,267
TOTAL EQUITY	64,760	64,937
TOTAL LIABILITIES AND EQUITY	664,809	629,369
Bank Subsidiaries | Banco Santander S.A. | Reportable Legal Entities
ASSETS
Cash and due from banks	15,354	14,519
Investment securities	7,697	13,603
Investment in affiliated companies	66,035	60,186
LIABILITIES
Deposits	17,378	17,045
Total debt	634	617
Non-Bank Subsidiaries | Banco Santander S.A. | Reportable Legal Entities
ASSETS
Investment securities	13,242	3,399
Net Loans and leases	27,670	27,555
Investment in affiliated companies	20,596	24,703
LIABILITIES
Deposits	31,649	19,949
Total debt	€ 688	€ 661

Additional disclosure require_4

Additional disclosure requirements - Parent-Only Income Statements (Details) - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Condensed Income Statements, Captions [Line Items]
Interest from earning assets	€ 21,933	€ 24,499
Dividends from affiliated companies	309	265
Interest expense	(5,737)	(8,297)
Non-interest income	1,167	765
Non-interest expense	(1,289)	(1,122)
Operating profit/(loss) before tax	6,914	(6,410)
Tax expense or income from continuing operations	(2,474)	(3,928)
Profit/(loss) for the period	4,440	(10,338)
Banco Santander S.A. | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Interest from earning assets	3,473	3,628
Dividends from affiliated companies	1,139	654
Interest and dividends from affiliates	4,612	4,282
Interest expense	(1,369)	(1,763)
Interest income/(Charges)	3,243	2,519
Provision for credit losses	(916)	(1,070)
Interest income/ (Charges) after provision for credit losses	2,327	1,449
Non-interest income	2,134	2,058
Non-interest expense	(3,411)	(8,571)
Operating profit/(loss) before tax	1,050	(5,064)
Tax expense or income from continuing operations	(147)	(1,747)
Profit/(loss) for the period	903	(6,811)
Banco Santander S.A. | Reportable Legal Entities | Bank Subsidiaries
Condensed Income Statements, Captions [Line Items]
Dividends from affiliated companies	886	407
Banco Santander S.A. | Reportable Legal Entities | Non-Bank Subsidiaries
Condensed Income Statements, Captions [Line Items]
Dividends from affiliated companies	€ 253	€ 247

Additional disclosure require_5

Additional disclosure requirements - Parent-Only Comprehensive Income Statements (Details) - EUR (€) € in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Condensed Statement of Income Captions [Line Items]
NET INCOME	€ 4,440	€ (10,338)
OTHER COMPREHENSIVE INCOME	946	(7,184)
Items that may be reclassified to profit or loss	556	(6,488)
Hedging instruments (items not designated)	0	0
Revaluation gains (losses)	0	0
Amounts transferred to income statement	0	0
Other reclassifications	0	0
Debt instruments at fair value with changes in other comprehensive income	(1,914)	(82)
Revaluation gains (losses)	(1,637)	272
Amounts transferred to income statement	(277)	(727)
Other reclassifications	0	373
Cash flow hedges:	(230)	774
Revaluation gains/(losses)	(651)	3,070
Amounts transferred to income statement	421	(2,296)
Other reclassifications	0	0
Hedges of net investments in foreign operations:	(1,001)	2,524
Exchange differences	3,036	(9,499)
Non-current assets held for sale	0	0
Income tax	616	7
Items that will not be reclassified to profit or loss	390	(696)
Actuarial gains/(losses) on pension plans	885	204
Other recognised income and expense of investments in subsidiaries, joint ventures and associates	(8)	(7)
Changes in the fair value of equity instruments measured at fair value through other comprehensive income	(68)	(880)
Gains or losses resulting from the accounting for hedges of equity instruments measured at fair value through other comprehensive income, net	0	0
Changes in the fair value of financial liabilities at fair value through profit or loss attributable to changes in credit risk	(129)	65
Income tax relating to items that will not be reclassified	(290)	(78)
Total comprehensive income	5,386	(17,522)	€ (3,557)
Banco Santander S.A. | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
NET INCOME	903	(6,811)
OTHER COMPREHENSIVE INCOME	(380)	(829)
Items that may be reclassified to profit or loss	(115)	(210)
Hedging instruments (items not designated)	0	0
Revaluation gains (losses)	0	0
Amounts transferred to income statement	0	0
Other reclassifications	0	0
Debt instruments at fair value with changes in other comprehensive income	(333)	(199)
Revaluation gains (losses)	(192)	95
Amounts transferred to income statement	(141)	(294)
Other reclassifications	0	0
Cash flow hedges:	168	(104)
Revaluation gains/(losses)	172	(126)
Amounts transferred to income statement	(4)	22
Amounts transferred to initial carrying amount of hedged items	0	0
Other reclassifications	0	0
Hedges of net investments in foreign operations:	0	0
Exchange differences	0	0
Non-current assets held for sale	0	0
Income tax	50	93
Items that will not be reclassified to profit or loss	(265)	(619)
Actuarial gains/(losses) on pension plans	45	(42)
Other recognised income and expense of investments in subsidiaries, joint ventures and associates	0	0
Changes in the fair value of equity instruments measured at fair value through other comprehensive income	(209)	(688)
Gains or losses resulting from the accounting for hedges of equity instruments measured at fair value through other comprehensive income, net	0	0
Changes in the fair value of equity instruments measured at fair value through other comprehensive income (hedged item)	54	12
Changes in the fair value of equity instruments measured at fair value through other comprehensive income (hedging instrument)	(54)	(12)
Changes in the fair value of financial liabilities at fair value through profit or loss attributable to changes in credit risk	(116)	5
Income tax relating to items that will not be reclassified	15	106
Total comprehensive income	€ 523	€ (7,640)

Additional disclosure require_6

Additional disclosure requirements - Parent-Only Cash Flow Statements (Details) - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Condensed Cash Flow Statements, Captions [Line Items]
CONSOLIDATED PROFIT/(LOSS) FOR THE PERIOD	€ 4,440	€ (10,338)
Adjustments to profit	11,142	24,498
Net increase/decrease in operating assets	(9,091)	(116,992)
Net increase/decrease in operating liabilities	22,830	148,123
Reimbursements/payments of income tax	(1,276)	(223)
CASH FLOWS FROM OPERATING ACTIVITIES	28,045	45,068
Investments (-)	(4,022)	(4,664)
Divestments (+)	2,344	1,819
CASH FLOWS FROM INVESTING ACTIVITIES	(1,678)	(2,845)
Issuance of own equity instruments	0	0
Proceeds from disposal of own equity instruments	387	421
Payments for acquisition of own equity instrument	(404)	(454)
Dividends paid	(477)	0
Other collections/payments related to financing activities	(751)	(1,667)
CASH FLOWS FROM FINANCING ACTIVITIES	(286)	(1,858)
EFFECT OF FOREIGN EXCHANGE RATE CHANGES	3,171	(3,166)
NET INCREASE/(DECREASE) IN CASH AND CASH EQUIVALENTS	29,252	37,199
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	153,839	101,067
CASH AND CASH EQUIVALENTS AT END OF PERIOD	183,091	138,266
Banco Santander S.A. | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
CONSOLIDATED PROFIT/(LOSS) FOR THE PERIOD	903	(6,811)
Adjustments to profit	546	11,830
Net increase/decrease in operating assets	(26,844)	(63,984)
Net increase/decrease in operating liabilities	33,777	83,119
Reimbursements/payments of income tax	349	942
CASH FLOWS FROM OPERATING ACTIVITIES	8,731	25,096
Investments (-)	(946)	(1,874)
Divestments (+)	3,597	497
CASH FLOWS FROM INVESTING ACTIVITIES	2,651	(1,377)
Issuance of own equity instruments	0	0
Proceeds from disposal of own equity instruments	316	327
Payments for acquisition of own equity instrument	(316)	(327)
Issuance of debt securities	1,578	1,500
Redemption of debt securities	(426)	(1,914)
Dividends paid	(477)	0
Issuance/Redemption of equity instruments	0	0
Other collections/payments related to financing activities	(100)	(162)
CASH FLOWS FROM FINANCING ACTIVITIES	575	(576)
EFFECT OF FOREIGN EXCHANGE RATE CHANGES	180	(253)
NET INCREASE/(DECREASE) IN CASH AND CASH EQUIVALENTS	12,137	22,890
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	67,561	32,471
CASH AND CASH EQUIVALENTS AT END OF PERIOD	€ 79,698	€ 55,361

Additional disclosure require_7

Additional disclosure requirements - Preference Shares and Preferred Securities (Details) - Financial liabilities at amortized cost - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Subordinated liabilities
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount	€ 9,241	€ 7,621
Preference shares
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount	205	196
Preferred securities
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount	€ 9,036	€ 7,425

Additional disclosure require_8

Additional disclosure requirements - Preference Shares and Securities Detail (Details) € in Millions, £ in Millions, $ in Millions	1 Months Ended	6 Months Ended
	May 31, 2021	Jun. 30, 2021EUR (€)	Jun. 30, 2021GBP (£)	Jun. 30, 2021USD ($)
Issuance By Santander UK PLC In October 1995 | Preference shares
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount | £			£ 80.3
Interest rate (as a percent)		10.375%	10.375%	10.375%
Issuance By Santander UK PLC In February 1996 | Preference shares
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount | £			£ 80.3
Interest rate (as a percent)		10.375%	10.375%	10.375%
Issuance By Banco Santander S.A. In September 2014
Disclosure of detailed information about financial instruments [line items]
Initial interest rate term		7 years
Reference rate		5-year Mid-Swap Rate
Issuance By Banco Santander S.A. In September 2014 | Preferred securities
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount		€ 1,500
Interest rate (as a percent)		6.25%	6.25%	6.25%
Adjustment to reference rate, after initial interest rate period		5.64%	5.64%	5.64%
Issuance By Banco Santander In April 2017
Disclosure of detailed information about financial instruments [line items]
Initial interest rate term		5 years
Reference rate		5-year Mid-Swap Rate
Issuance By Banco Santander In April 2017 | Preferred securities
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount		€ 750
Interest rate (as a percent)		6.75%	6.75%	6.75%
Adjustment to reference rate, after initial interest rate period		6.803%	6.803%	6.803%
Issuance By Banco Santander In September 2017
Disclosure of detailed information about financial instruments [line items]
Initial interest rate term		6 years
Reference rate		5-year Mid-Swap Rate
Issuance By Banco Santander In September 2017 | Preferred securities
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount		€ 1,000
Interest rate (as a percent)		5.25%	5.25%	5.25%
Adjustment to reference rate, after initial interest rate period		4.999%	4.999%	4.999%
Issuance By Banco Santander In March 2018
Disclosure of detailed information about financial instruments [line items]
Initial interest rate term		7 years
Reprice term		5 years
Reference rate		5-year Mid-Swap Rate
Issuance By Banco Santander In March 2018 | Preferred securities
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount		€ 1,500
Interest rate (as a percent)		4.75%	4.75%	4.75%
Adjustment to reference rate, after initial interest rate period		4.097%	4.097%	4.097%
Issuance By Banco Santander S.A. in February 2019
Disclosure of detailed information about financial instruments [line items]
Interest rate (as a percent)		7.50%	7.50%	7.50%
Initial interest rate term		7 years
Reprice term		5 years
Adjustment to reference rate, after initial interest rate period		4.899%	4.899%	4.899%
Reference rate		5-year Mid-Swap Rate
Issuance By Banco Santander S.A. in February 2019 | Preferred securities
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount | $				$ 1,200
Interest rate (as a percent)		7.50%	7.50%	7.50%
Issuance By Banco Santander S.A. in January 2020
Disclosure of detailed information about financial instruments [line items]
Interest rate (as a percent)		4.375%	4.375%	4.375%
Initial interest rate term		6 years
Reprice term		5 years
Adjustment to reference rate, after initial interest rate period		4.534%	4.534%	4.534%
Reference rate		5-year Mid-Swap Rate
Issuance By Banco Santander S.A. in January 2020 | Preferred securities
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount | $				$ 1,500
Interest rate (as a percent)		4.375%	4.375%	4.375%
Issuance By Banco Santander S.A. In May 2021 | US Dollar Series
Disclosure of detailed information about financial instruments [line items]
Interest rate (as a percent)	4.75%	4.75%	4.75%	4.75%
Initial interest rate term	6 years	6 years
Reprice term	5 years	5 years
Adjustment to reference rate, after initial interest rate period	3.753%	3.753%	3.753%	3.753%
Reference rate	5-year UST	5-year UST
Issuance By Banco Santander S.A. In May 2021 | Euro Series
Disclosure of detailed information about financial instruments [line items]
Interest rate (as a percent)	4.125%	4.125%	4.125%	4.125%
Initial interest rate term	7 years	7 years
Reprice term	5 years	5 years
Adjustment to reference rate, after initial interest rate period	4.311%	4.311%	4.311%	4.311%
Reference rate	5-year Euro mid-swap	5-year Euro mid-swap
Issuance By Banco Santander S.A. In May 2021 | Preferred securities | US Dollar Series
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount | $				$ 1,000
Interest rate (as a percent)		4.75%	4.75%	4.75%
Issuance By Banco Santander S.A. In May 2021 | Preferred securities | Euro Series
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount | $				$ 750
Interest rate (as a percent)		4.125%	4.125%	4.125%
Issuance By Santander Finance Preferred S.A. In September 2004 | Preferred securities
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount		€ 144
Issuance By Santander Finance Preferred S.A. In September 2004 | CMS 10 Interest rate | Preferred securities
Disclosure of detailed information about financial instruments [line items]
Interest rate (as a percent)		8.00%	8.00%	8.00%
Variable interest rate ( as a percent)		0.05%	0.05%	0.05%
Issuance By Santander Finance Preferred S.A. In July 2007 | Preferred securities
Disclosure of detailed information about financial instruments [line items]
Outstanding issue amount | £			£ 4.9
Interest rate (as a percent)		7.01%	7.01%	7.01%

Uncategorized Items - san-20210

Label	Element	Value
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]
Ifrs Cumulative Effect Of New Accounting Principle In Period Of Adoption	san_IfrsCumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	€ 0
Accumulated Other Comprehensive Income Attributable To Owners Of Parent [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]
Ifrs Cumulative Effect Of New Accounting Principle In Period Of Adoption	san_IfrsCumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Other reserves [member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]
Ifrs Cumulative Effect Of New Accounting Principle In Period Of Adoption	san_IfrsCumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	€ 0