v3.26.1
Financial Risks - Summary of Quantitative Information about Financial Exposure to Currency Risk (Detail) - Currency risk [member] - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Financial instruments - assets [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
€ 69,335
€ 76,078
Financial instruments - liabilities [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
103,059
98,783
Insurance and reinsurance assets [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
17,171
16,147
Insurance and reinsurance liabilities [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
197,544
210,993
EUR [member] | Financial instruments - assets [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
722
729
EUR [member] | Financial instruments - liabilities [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
2,774
2,823
EUR [member] | Insurance and reinsurance assets [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
8
7
EUR [member] | Insurance and reinsurance liabilities [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
712
720
GBP [member] | Financial instruments - assets [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
1,437
1,588
GBP [member] | Financial instruments - liabilities [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
58,644
51,034
GBP [member] | Insurance and reinsurance assets [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
1
3
GBP [member] | Insurance and reinsurance liabilities [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
65,978
66,675
USD [member] | Financial instruments - assets [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
66,487
72,942
USD [member] | Financial instruments - liabilities [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
41,641
44,925
USD [member] | Insurance and reinsurance assets [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
17,110
16,090
USD [member] | Insurance and reinsurance liabilities [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
126,161
137,867
Other [Member] | Financial instruments - assets [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
689
819
Other [Member] | Insurance and reinsurance assets [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
52
46
Other [Member] | Insurance and reinsurance liabilities [member]
Disclosure of quantitative information about financial instruments and insurance and reinsurance contracts exposure to currency risk [line items]
Maximum exposure to currency risk
€ 4,693
€ 5,730
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