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Tangible assets - Disclosure of changes in tangible assets in the consolidated balance sheets (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | € 32,087 | € 33,882 |
Balance, at the end of the period | 27,438 | 32,087 | € 33,882
For own use |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 12,636 | 13,408 |
Balance, at the end of the period | 11,663 | 12,636 | 13,408
Leased out under an operating lease |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 18,576 | 19,518 |
Balance, at the end of the period | 14,753 | 18,576 | 19,518
Investment property |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 875 | 956 |
Balance, at the end of the period | 1,022 | 875 | 956
Right-of-use for operating lease |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 1,918 | 2,183 |
Balance, at the end of the period | 1,556 | 1,918 | 2,183
Right-of-use for operating lease | For own use |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 1,918 | 2,183 |
Balance, at the end of the period | 1,556 | 1,918 | 2,183
Right-of-use for operating lease | Leased out under an operating lease |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 0 | 0 |
Balance, at the end of the period | 0 | 0 | 0
Right-of-use for operating lease | Investment property |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 0 | 0 |
Balance, at the end of the period | 0 | 0 | 0
Cost |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 50,510 | 53,123 | 53,316
Additions / disposals (net) due to change in the scope of consolidation | 11 | (1,164) | 48
Additions / disposals (net) | (2,335) | (1,003) | 1,830
Transfers, exchange differences and other items | (3,400) | (446) | (2,071)
Balance, at the end of the period | 44,786 | 50,510 | 53,123
Cost | For own use |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 25,656 | 26,243 | 26,570
Additions / disposals (net) due to change in the scope of consolidation | 4 | 28 | 11
Additions / disposals (net) | 326 | 730 | 1,122
Transfers, exchange differences and other items | (1,845) | (1,345) | (1,460)
Balance, at the end of the period | 24,141 | 25,656 | 26,243
Cost | Leased out under an operating lease |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 23,399 | 25,304 | 25,166
Additions / disposals (net) due to change in the scope of consolidation | 0 | (1,192) | 37
Additions / disposals (net) | (2,603) | (1,716) | 742
Transfers, exchange differences and other items | (1,743) | 1,003 | (641)
Balance, at the end of the period | 19,053 | 23,399 | 25,304
Cost | Investment property |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 1,455 | 1,576 | 1,580
Additions / disposals (net) due to change in the scope of consolidation | 7 | 0 | 0
Additions / disposals (net) | (58) | (17) | (34)
Transfers, exchange differences and other items | 188 | (104) | 30
Balance, at the end of the period | 1,592 | 1,455 | 1,576
Cost | Right-of-use for operating lease |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 4,781 | 4,837 | 4,692
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | (13)
Additions / disposals (net) | (40) | 179 | 125
Transfers, exchange differences and other items | (450) | (235) | 33
Balance, at the end of the period | 4,291 | 4,781 | 4,837
Cost | Right-of-use for operating lease | For own use |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 4,781 | 4,837 | 4,692
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | (13)
Additions / disposals (net) | (40) | 179 | 125
Transfers, exchange differences and other items | (450) | (235) | 33
Balance, at the end of the period | 4,291 | 4,781 | 4,837
Cost | Right-of-use for operating lease | Leased out under an operating lease |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 0 | 0 | 0
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 0
Additions / disposals (net) | 0 | 0 | 0
Transfers, exchange differences and other items | 0 | 0 | 0
Balance, at the end of the period | 0 | 0 | 0
Cost | Right-of-use for operating lease | Investment property |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 0 | 0 | 0
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 0
Additions / disposals (net) | 0 | 0 | 0
Transfers, exchange differences and other items | 0 | 0 | 0
Balance, at the end of the period | 0 | 0 | 0
Accumulated depreciation |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | (17,565) | (18,618) | (18,642)
Additions / disposals (net) due to change in the scope of consolidation | 0 | 686 | 7
Additions / disposals (net) | 3,091 | 3,886 | 2,824
Charge for the year | (1,331) | (1,553) | (1,700)
Transfers, exchange differences and other items | (799) | (1,966) | (1,107)
Balance, at the end of the period | (16,604) | (17,565) | (18,618)
Accumulated depreciation | For own use |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | (12,619) | (12,637) | (12,892)
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 7
Additions / disposals (net) | 663 | 672 | 284
Charge for the year | (1,323) | (1,544) | (1,689)
Transfers, exchange differences and other items | 1,150 | 890 | 1,653
Balance, at the end of the period | (12,129) | (12,619) | (12,637)
Accumulated depreciation | Leased out under an operating lease |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | (4,784) | (5,782) | (5,578)
Additions / disposals (net) due to change in the scope of consolidation | 0 | 686 | 0
Additions / disposals (net) | 2,428 | 3,214 | 2,540
Charge for the year | 0 | 0 | 0
Transfers, exchange differences and other items | (1,917) | (2,902) | (2,744)
Balance, at the end of the period | (4,273) | (4,784) | (5,782)
Accumulated depreciation | Investment property |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | (162) | (199) | (172)
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 0
Additions / disposals (net) | 0 | 0 | 0
Charge for the year | (8) | (9) | (11)
Transfers, exchange differences and other items | (32) | 46 | (16)
Balance, at the end of the period | (202) | (162) | (199)
Accumulated depreciation | Right-of-use for operating lease |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | (2,814) | (2,609) | (2,265)
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 7
Additions / disposals (net) | 177 | 196 | 160
Charge for the year | (405) | (460) | (580)
Transfers, exchange differences and other items | 381 | 59 | 69
Balance, at the end of the period | (2,661) | (2,814) | (2,609)
Accumulated depreciation | Right-of-use for operating lease | For own use |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | (2,814) | (2,609) | (2,265)
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 7
Additions / disposals (net) | 177 | 196 | 160
Charge for the year | (405) | (460) | (580)
Transfers, exchange differences and other items | 381 | 59 | 69
Balance, at the end of the period | (2,661) | (2,814) | (2,609)
Accumulated depreciation | Right-of-use for operating lease | Leased out under an operating lease |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 0 | 0 | 0
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 0
Additions / disposals (net) | 0 | 0 | 0
Charge for the year |  | 0 | 0
Transfers, exchange differences and other items | 0 | 0 | 0
Balance, at the end of the period | 0 | 0 | 0
Accumulated depreciation | Right-of-use for operating lease | Investment property |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 0 | 0 | 0
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 0
Additions / disposals (net) | 0 | 0 | 0
Charge for the year | 0 | 0 | 0
Transfers, exchange differences and other items | 0 | 0 | 0
Balance, at the end of the period | 0 | 0 | 0
Impairment losses |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | (858) | (623) | (601)
Impairment charge for the year | (266) | (427) | (154)
Releases | 137 | 45 | 19
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 0
Additions / disposals (net) | 34 | 53 | 40
Transfers, exchange differences and other items | 209 | 94 | 73
Balance, at the end of the period | (744) | (858) | (623)
Impairment losses | For own use |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | (401) | (198) | (189)
Impairment charge for the year | (172) | (276) | (113)
Releases | 41 | 34 | 4
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 0
Additions / disposals (net) | 17 | 53 | 36
Transfers, exchange differences and other items | 166 | (14) | 64
Balance, at the end of the period | (349) | (401) | (198)
Impairment losses | Leased out under an operating lease |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | (39) | (4) | (33)
Impairment charge for the year | (79) | (70) | (29)
Releases | 71 | 3 | 11
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 0
Additions / disposals (net) | 17 | 0 | 0
Transfers, exchange differences and other items | 3 | 32 | 47
Balance, at the end of the period | (27) | (39) | (4)
Impairment losses | Investment property |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | (418) | (421) | (379)
Impairment charge for the year | (15) | (81) | (12)
Releases | 25 | 8 | 4
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 0
Additions / disposals (net) | 0 | 0 | 4
Transfers, exchange differences and other items | 40 | 76 | (38)
Balance, at the end of the period | (368) | (418) | (421)
Impairment losses | Right-of-use for operating lease |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | (49) | (45) | (14)
Impairment charge for the year | (41) | (31) | (38)
Releases | 1 | 10 | 3
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 0
Additions / disposals (net) | 6 | 19 | 5
Transfers, exchange differences and other items | 9 | (2) | (1)
Balance, at the end of the period | (74) | (49) | (45)
Impairment losses | Right-of-use for operating lease | For own use |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | (49) | (45) | (14)
Impairment charge for the year | (41) | (31) | (38)
Releases | 1 | 10 | 3
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 0
Additions / disposals (net) | 6 | 19 | 5
Transfers, exchange differences and other items | 9 | (2) | (1)
Balance, at the end of the period | (74) | (49) | (45)
Impairment losses | Right-of-use for operating lease | Leased out under an operating lease |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 0 | 0 | 0
Impairment charge for the year | 0 | 0 | 0
Releases | 0 | 0 | 0
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 0
Additions / disposals (net) | 0 | 0 |
Transfers, exchange differences and other items | 0 | 0 | 0
Balance, at the end of the period | 0 | 0 | 0
Impairment losses | Right-of-use for operating lease | Investment property |  |  |
Changes in property, plant and equipment [abstract] |  |  |
Balance, at the beginning of the period | 0 | 0 | 0
Impairment charge for the year | 0 | 0 | 0
Releases | 0 | 0 | 0
Additions / disposals (net) due to change in the scope of consolidation | 0 | 0 | 0
Additions / disposals (net) | 0 | 0 |
Transfers, exchange differences and other items | 0 | 0 | 0
Balance, at the end of the period | € 0 | € 0 | € 0

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