Financial Risks - Schedule of Credit Risk Concentration - Debt Securities and Money Market Investments (Detail) - Debt securities and money market investments [member] - Credit risk [member] - EUR (€)
€ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
€ 54,060
|
€ 59,162
|
| Residential mortgage-backed securities (RMBSs) [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
827
|
684
|
| Commercial mortgage-backed securities (CMBSs) [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
2,479
|
2,582
|
| Asset-backed securities [member] | Collateralized debt obligations [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
617
|
585
|
| Asset-backed securities [member] | Other securities [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
5,991
|
4,952
|
| Financial - Banking [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
3,616
|
4,101
|
| Financial - Other [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
10,144
|
10,758
|
| Capital goods and other industry [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
3,366
|
3,742
|
| Communications & Technology [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
3,967
|
4,758
|
| Consumer cyclical [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
3,463
|
3,757
|
| Consumer non-cyclical [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
5,216
|
6,151
|
| Energy [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
2,376
|
2,844
|
| Transportation [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
1,682
|
1,816
|
| Utility [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
3,941
|
4,833
|
| Government bonds [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
[1] |
6,374
|
7,601
|
| Past due and impaired [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(347)
|
(341)
|
| Past due and impaired [member] | Residential mortgage-backed securities (RMBSs) [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(16)
|
(19)
|
| Past due and impaired [member] | Commercial mortgage-backed securities (CMBSs) [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(40)
|
(22)
|
| Past due and impaired [member] | Asset-backed securities [member] | Collateralized debt obligations [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(1)
|
|
| Past due and impaired [member] | Asset-backed securities [member] | Other securities [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(29)
|
(16)
|
| Past due and impaired [member] | Financial - Banking [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(15)
|
(19)
|
| Past due and impaired [member] | Financial - Other [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(53)
|
(57)
|
| Past due and impaired [member] | Capital goods and other industry [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(41)
|
(31)
|
| Past due and impaired [member] | Communications & Technology [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(44)
|
(58)
|
| Past due and impaired [member] | Consumer cyclical [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(35)
|
(39)
|
| Past due and impaired [member] | Consumer non-cyclical [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(33)
|
(31)
|
| Past due and impaired [member] | Energy [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(12)
|
(13)
|
| Past due and impaired [member] | Transportation [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(6)
|
(6)
|
| Past due and impaired [member] | Utility [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(10)
|
(12)
|
| Past due and impaired [member] | Government bonds [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
(13)
|
(18)
|
| Americas [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
51,990
|
56,861
|
| Americas [member] | Residential mortgage-backed securities (RMBSs) [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
827
|
684
|
| Americas [member] | Commercial mortgage-backed securities (CMBSs) [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
2,419
|
2,469
|
| Americas [member] | Asset-backed securities [member] | Collateralized debt obligations [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
616
|
582
|
| Americas [member] | Asset-backed securities [member] | Other securities [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
5,820
|
4,761
|
| Americas [member] | Financial - Banking [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
3,261
|
3,751
|
| Americas [member] | Financial - Other [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
9,831
|
10,464
|
| Americas [member] | Capital goods and other industry [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
3,273
|
3,639
|
| Americas [member] | Communications & Technology [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
3,879
|
4,642
|
| Americas [member] | Consumer cyclical [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
3,354
|
3,641
|
| Americas [member] | Consumer non-cyclical [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
5,062
|
5,987
|
| Americas [member] | Energy [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
2,325
|
2,766
|
| Americas [member] | Transportation [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
1,658
|
1,786
|
| Americas [member] | Utility [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
3,902
|
4,763
|
| Americas [member] | Government bonds [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
5,762
|
6,926
|
| United Kingdom [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
682
|
830
|
| United Kingdom [member] | Commercial mortgage-backed securities (CMBSs) [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
26
|
65
|
| United Kingdom [member] | Asset-backed securities [member] | Other securities [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
43
|
54
|
| United Kingdom [member] | Financial - Banking [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
165
|
172
|
| United Kingdom [member] | Financial - Other [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
54
|
24
|
| United Kingdom [member] | Capital goods and other industry [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
18
|
24
|
| United Kingdom [member] | Communications & Technology [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
11
|
4
|
| United Kingdom [member] | Consumer cyclical [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
9
|
25
|
| United Kingdom [member] | Consumer non-cyclical [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
38
|
49
|
| United Kingdom [member] | Energy [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
10
|
27
|
| United Kingdom [member] | Utility [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
2
|
16
|
| United Kingdom [member] | Government bonds [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
302
|
370
|
| International [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
1,169
|
1,320
|
| International [member] | Commercial mortgage-backed securities (CMBSs) [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
34
|
47
|
| International [member] | Asset-backed securities [member] | Collateralized debt obligations [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
1
|
3
|
| International [member] | Asset-backed securities [member] | Other securities [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
26
|
49
|
| International [member] | Financial - Banking [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
190
|
178
|
| International [member] | Financial - Other [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
158
|
224
|
| International [member] | Capital goods and other industry [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
76
|
79
|
| International [member] | Communications & Technology [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
77
|
112
|
| International [member] | Consumer cyclical [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
100
|
91
|
| International [member] | Consumer non-cyclical [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
116
|
116
|
| International [member] | Energy [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
41
|
51
|
| International [member] | Transportation [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
20
|
29
|
| International [member] | Utility [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
37
|
54
|
| International [member] | Government bonds [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
293
|
286
|
| Asset management [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
220
|
152
|
| Asset management [member] | Asset-backed securities [member] | Other securities [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
102
|
88
|
| Asset management [member] | Financial - Other [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
100
|
46
|
| Asset management [member] | Government bonds [member] |
|
|
|
| Disclosure of credit risk exposure [line items] |
|
|
|
| Credit risk concentrations |
|
€ 17
|
€ 18
|
|
|