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Provisions - Schedule of changes in provision (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of other provisions [line items] |  |  |
Balances at beginning of year | € 8,407 | € 8,441 | € 8,149
Incorporation of Group companies, net | (13) | 0 | (4)
Additions charged to income | 2,434 | 3,212 | 2,193
Interest expense (note 39) | 91 | 105 | 93
Staff costs (note 46) | 41 | 45 | 42
Provisions or reversion of provisions | 2,302 | 3,062 | 2,058
Addition | 5,057 | 4,796 | 3,992
Release | (2,755) | (1,734) | (1,934)
Other additions arising from insurance contracts linked to pensions | (5) | (2) | 0
Changes in value recognised in equity | 220 | 643 | 944
Payments to pensioners and pre-retirees with a charge to internal provisions | (465) | (484) | (498)
Benefits paid due to settlements | (31) |  |
Insurance premiums paid | 0 | 0 | 0
Payments to external funds | (329) | (708) | (750)
Amounts used | (1,914) | (2,178) | (1,826)
Transfer, exchange differences and other changes | 51 | (517) | 233
Balances at end of year | 8,355 | 8,407 | 8,441
Post employment plans |  |  |
Disclosure of other provisions [line items] |  |  |
Balances at beginning of year | 1,731 | 2,225 | 2,392
Incorporation of Group companies, net | (13) | 0 | (4)
Additions charged to income | 75 | 94 | 92
Interest expense (note 39) | 59 | 76 | 59
Staff costs (note 46) | 32 | 34 | 33
Provisions or reversion of provisions | (16) | (16) | 0
Addition | 6 | 5 | 3
Release | (22) | (21) | (3)
Other additions arising from insurance contracts linked to pensions | (5) | (2) | 0
Changes in value recognised in equity | 220 | 643 | 944
Payments to pensioners and pre-retirees with a charge to internal provisions | (107) | (153) | (182)
Benefits paid due to settlements | (31) |  |
Insurance premiums paid | 0 | 0 | 0
Payments to external funds | (329) | (708) | (750)
Amounts used | 0 | 0 | 0
Transfer, exchange differences and other changes | 115 | (368) | (267)
Balances at end of year | 1,656 | 1,731 | 2,225
Long term employee benefits |  |  |
Disclosure of other provisions [line items] |  |  |
Balances at beginning of year | 915 | 880 | 950
Incorporation of Group companies, net | 0 | 0 | 0
Additions charged to income | 437 | 368 | 244
Interest expense (note 39) | 32 | 29 | 34
Staff costs (note 46) | 9 | 11 | 9
Provisions or reversion of provisions | 396 | 328 | 201
Addition | 424 | 335 | 204
Release | (28) | (7) | (3)
Other additions arising from insurance contracts linked to pensions | 0 | 0 | 0
Changes in value recognised in equity | 0 | 0 | 0
Payments to pensioners and pre-retirees with a charge to internal provisions | (358) | (331) | (316)
Benefits paid due to settlements | 0 |  |
Insurance premiums paid | 0 | 0 | 0
Payments to external funds | 0 | 0 | 0
Amounts used | 0 | 0 | 0
Transfer, exchange differences and other changes | (1) | (2) | 2
Balances at end of year | 993 | 915 | 880
Contingent liabilities and commitments |  |  |
Disclosure of other provisions [line items] |  |  |
Balances at beginning of year | 710 | 702 | 734
Incorporation of Group companies, net | 0 | 0 | 0
Additions charged to income | 50 | 47 | (38)
Interest expense (note 39) | 0 | 0 | 0
Staff costs (note 46) | 0 | 0 | 0
Provisions or reversion of provisions | 50 | 47 | (38)
Addition | 591 | 430 | 378
Release | (541) | (383) | (416)
Other additions arising from insurance contracts linked to pensions | 0 | 0 | 0
Changes in value recognised in equity | 0 | 0 | 0
Payments to pensioners and pre-retirees with a charge to internal provisions | 0 | 0 | 0
Benefits paid due to settlements | 0 |  |
Insurance premiums paid | 0 | 0 | 0
Payments to external funds | 0 | 0 | 0
Amounts used | 0 | 0 | (1)
Transfer, exchange differences and other changes | (47) | (39) | 7
Balances at end of year | 713 | 710 | 702
Other provisions |  |  |
Disclosure of other provisions [line items] |  |  |
Balances at beginning of year | 5,051 | 4,634 | 4,073
Incorporation of Group companies, net | 0 | 0 | 0
Additions charged to income | 1,872 | 2,703 | 1,895
Interest expense (note 39) | 0 | 0 | 0
Staff costs (note 46) | 0 | 0 | 0
Provisions or reversion of provisions | 1,872 | 2,703 | 1,895
Addition | 4,036 | 4,026 | 3,407
Release | (2,164) | (1,323) | (1,512)
Other additions arising from insurance contracts linked to pensions | 0 | 0 | 0
Changes in value recognised in equity | 0 | 0 | 0
Payments to pensioners and pre-retirees with a charge to internal provisions | 0 | 0 | 0
Benefits paid due to settlements | 0 |  |
Insurance premiums paid | 0 | 0 | 0
Payments to external funds | 0 | 0 | 0
Amounts used | (1,914) | (2,178) | (1,825)
Transfer, exchange differences and other changes | (16) | (108) | 491
Balances at end of year | € 4,993 | € 5,051 | € 4,634

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