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Note 16 Tangible Assets Breakdown By Type Of Asset (Details) - EUR (€)
€ in Millions
Jun. 30, 2023
Dec. 31, 2022
Disclosure of Tangible assets breakdown by type of asset [Line Items]    
Property, plant and equipment € 8,613 € 8,441
Property plant and equipment for own use 8,080 7,911
Assets leased out under an operating lease 533 530
Investment property (279) (296)
Tangible assets 8,892 8,737
Land and buildings [member]    
Disclosure of Tangible assets breakdown by type of asset [Line Items]    
Property plant and equipment for own use 6,434 6,255
Construction in progress [member]    
Disclosure of Tangible assets breakdown by type of asset [Line Items]    
Property plant and equipment for own use 168 93
2590 Miscellaneous Furniture and Fixtures [Member]    
Disclosure of Tangible assets breakdown by type of asset [Line Items]    
Property plant and equipment for own use 6,140 5,833
Right of use assets [Member]    
Disclosure of Tangible assets breakdown by type of asset [Line Items]    
Property plant and equipment for own use 1,989 1,871
Investment property (232) (213)
Accumulated depreciation and amortisation [member]    
Disclosure of Tangible assets breakdown by type of asset [Line Items]    
Property plant and equipment for own use (6,455) (5,920)
Assets leased out under an operating lease (45) (52)
Investment property (106) (94)
Accumulated impairment [Member]    
Disclosure of Tangible assets breakdown by type of asset [Line Items]    
Property plant and equipment for own use (197) (220)
Investment property (76) (67)
Tangible assets leased out under an operating lease [Member]    
Disclosure of Tangible assets breakdown by type of asset [Line Items]    
Assets leased out under an operating lease 578 582
Building rental [Member]    
Disclosure of Tangible assets breakdown by type of asset [Line Items]    
Investment property (227) (242)
Other [Member]    
Disclosure of Tangible assets breakdown by type of asset [Line Items]    
Investment property € (1) € (2)