v3.26.1
Segment Information - Summary of Segment Results (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Summary of operating result per segment [Line Items]      
Operating result € 1,840 € 1,719 € 1,517
Fair value items 58 (209) 85
Realized gains / (losses) on investments (297) (53) (689)
Impairment (losses) / reversals (63) (229) (90)
Non-operating items (302) (491) (695)
Other income / (charges) (493) (568) (1,230)
Result before tax from continuing operations 1,045 660 (408)
Income tax (expense) / benefit (65) 16 209
Net result from continuing and discontinued operations 980 676 (199)
Revenues      
Insurance revenue 9,097 9,841 10,386
Interest revenue on financial instruments calculated using the effective interest method 3,320 3,325 3,336
Interest income from instruments measured at FVPL 832 823 826
Other investment income 2,024 2,069 1,833
Fee and commission income 2,390 2,378 2,160
Total revenues 17,664 18,436 18,541
Insurance contracts - Direct participating contracts [member]      
Revenues      
Insurance revenue 1,269 1,360 9,622
Insurance contracts - Without direct participation contracts [member]      
Revenues      
Insurance revenue 7,751 8,400 700
Investment contracts with DPF - Direct participating contracts [member]      
Revenues      
Insurance revenue 77 80 64
International [member] | Geographical Consolidation [member]      
Summary of operating result per segment [Line Items]      
Operating result 224 183 196
Fair value items (28) 2 (1)
Realized gains / (losses) on investments 48 15 24
Impairment (losses) / reversals (2) (12) (23)
Non-operating items 18 5 (1)
Other income / (charges) (21) 2 (110)
Result before tax from continuing operations 221 189 85
Income tax (expense) / benefit (69) (59) (69)
Net result from continuing and discontinued operations 152 130 16
Inter-segment operating result 120 267 256
Revenues      
Insurance revenue 1,748 1,674 1,795
Interest revenue on financial instruments calculated using the effective interest method 59 70 87
Interest income from instruments measured at FVPL 1 1 1
Other investment income 131 111 104
Fee and commission income 25 25 34
Other revenues 37 34 37
Total revenues 2,001 1,915 2,058
Inter-segment revenues     1
International [member] | Geographical Consolidation [member] | Insurance contracts - Direct participating contracts [member]      
Revenues      
Insurance revenue 2 2 1,095
International [member] | Geographical Consolidation [member] | Insurance contracts - Without direct participation contracts [member]      
Revenues      
Insurance revenue 1,745 1,671 700
Asset management [member] | Geographical Consolidation [member]      
Summary of operating result per segment [Line Items]      
Operating result 217 201 145
Fair value items 0 2 (8)
Impairment (losses) / reversals (2)    
Non-operating items (2) 2 (8)
Other income / (charges) (20) (45) (31)
Result before tax from continuing operations 195 158 106
Income tax (expense) / benefit (54) (48) (36)
Net result from continuing and discontinued operations 141 110 70
Inter-segment operating result 123 131 150
Revenues      
Interest revenue on financial instruments calculated using the effective interest method 1 1 2
Interest income from instruments measured at FVPL 15 13  
Other investment income 17 15 14
Fee and commission income 669 643 632
Other revenues 1 1 1
Total revenues 704 673 649
Inter-segment revenues 149 154 172
Holding and other activities [member] | Geographical Consolidation [member]      
Summary of operating result per segment [Line Items]      
Operating result (224) (209) (173)
Fair value items 42 23 24
Impairment (losses) / reversals     (7)
Non-operating items 42 23 17
Other income / (charges) 217 326 110
Result before tax from continuing operations 35 140 (46)
Income tax (expense) / benefit 29 31 31
Net result from continuing and discontinued operations 64 171 (14)
Inter-segment operating result 265 269 274
Revenues      
Interest revenue on financial instruments calculated using the effective interest method 45 76 90
Interest income from instruments measured at FVPL 0    
Other investment income 732 475 498
Total revenues 777 552 589
Inter-segment revenues 736 483 500
Segment total [member]      
Summary of operating result per segment [Line Items]      
Operating result 1,702 1,485 1,498
Fair value items 80 (208) 76
Realized gains / (losses) on investments (248) (36) (659)
Impairment (losses) / reversals (64) (236) (92)
Non-operating items (231) (480) (675)
Other income / (charges) (317) (245) (1,140)
Result before tax from continuing operations 1,154 760 (317)
Income tax (expense) / benefit (174) (85) 118
Net result from continuing and discontinued operations 980 676 (199)
Revenues      
Insurance revenue 10,608 11,275 11,876
Interest revenue on financial instruments calculated using the effective interest method 3,325 3,330 3,339
Interest income from instruments measured at FVPL 832 823 826
Other investment income 2,170 2,192 1,950
Fee and commission income 2,583 2,558 2,376
Other revenues 38 35 38
Total revenues 19,556 20,213 20,404
Segment total [member] | Insurance contracts - Direct participating contracts [member]      
Revenues      
Insurance revenue 1,270 1,361 11,112
Segment total [member] | Insurance contracts - Without direct participation contracts [member]      
Revenues      
Insurance revenue 9,261 9,833 700
Segment total [member] | Investment contracts with DPF - Direct participating contracts [member]      
Revenues      
Insurance revenue 77 80 64
JVs and associates eliminations [member]      
Summary of operating result per segment [Line Items]      
Operating result 137 234 19
Fair value items (22) (1) 9
Realized gains / (losses) on investments (50) (17) (30)
Impairment (losses) / reversals 1 7 2
Non-operating items (71) (11) (19)
Other income / (charges) (176) (324) (90)
Result before tax from continuing operations (109) (100) (91)
Income tax (expense) / benefit 109 100 91
Net result from continuing and discontinued operations 0    
Revenues      
Insurance revenue (1,511) (1,434) (1,490)
Interest revenue on financial instruments calculated using the effective interest method (5) (5) (3)
Other investment income (146) (124) (116)
Fee and commission income (193) (179) (215)
Other revenues (38) (35) (38)
Total revenues (1,893) (1,777) (1,862)
JVs and associates eliminations [member] | Insurance contracts - Direct participating contracts [member]      
Revenues      
Insurance revenue (1) (1) (1,490)
JVs and associates eliminations [member] | Insurance contracts - Without direct participation contracts [member]      
Revenues      
Insurance revenue (1,510) (1,433)  
Americas [member] | Geographical Consolidation [member]      
Summary of operating result per segment [Line Items]      
Operating result 1,209 1,062 1,107
Fair value items 27 (161) 138
Realized gains / (losses) on investments (296) (51) (683)
Impairment (losses) / reversals (60) (224) (62)
Non-operating items (328) (435) (607)
Other income / (charges) (518) (452) (961)
Result before tax from continuing operations 362 175 (460)
Income tax (expense) / benefit 12 8 214
Net result from continuing and discontinued operations 374 183 (246)
Inter-segment operating result (647) (596) (569)
Revenues      
Insurance revenue 8,477 9,102 9,468
Interest revenue on financial instruments calculated using the effective interest method 3,162 3,117 3,108
Interest income from instruments measured at FVPL 298 346 339
Other investment income 13 16 14
Fee and commission income 1,724 1,761 1,653
Total revenues 13,675 14,342 14,582
Inter-segment revenues 40 46 49
Americas [member] | Geographical Consolidation [member] | Insurance contracts - Direct participating contracts [member]      
Revenues      
Insurance revenue 999 1,101 9,468
Americas [member] | Geographical Consolidation [member] | Insurance contracts - Without direct participation contracts [member]      
Revenues      
Insurance revenue 7,478 8,001  
The Netherlands [member]      
Revenues      
Inter-segment revenues     (17)
The Netherlands [member] | Geographical Consolidation [member]      
Summary of operating result per segment [Line Items]      
Other income / (charges) [1]     (65)
Result before tax from continuing operations [1]     (65)
Net result from continuing and discontinued operations [1]     (65)
Inter-segment operating result [1]     (48)
United Kingdom [member] | Geographical Consolidation [member]      
Summary of operating result per segment [Line Items]      
Operating result 219 198 214
Fair value items (69) (67) (76)
Non-operating items (69) (67) (76)
Other income / (charges) (90) (48) (85)
Result before tax from continuing operations 60 83 52
Income tax (expense) / benefit (32) (16) (23)
Net result from continuing and discontinued operations 28 67 29
Inter-segment operating result (83) (86) (75)
Revenues      
Insurance revenue 422 543 663
Interest revenue on financial instruments calculated using the effective interest method 64 76 58
Interest income from instruments measured at FVPL 518 463 486
Other investment income 2,008 2,050 1,818
Fee and commission income 311 283 214
Total revenues 3,323 3,414 3,239
United Kingdom [member] | Geographical Consolidation [member] | Insurance contracts - Direct participating contracts [member]      
Revenues      
Insurance revenue 269 257 600
United Kingdom [member] | Geographical Consolidation [member] | Insurance contracts - Without direct participation contracts [member]      
Revenues      
Insurance revenue 76 206  
United Kingdom [member] | Geographical Consolidation [member] | Investment contracts with DPF - Direct participating contracts [member]      
Revenues      
Insurance revenue 77 80 64
Eliminations [member]      
Summary of operating result per segment [Line Items]      
Operating result 58 50 10
Fair value items 108 (7) (1)
Non-operating items 108 (7) (1)
Other income / (charges) 115 (28) 2
Result before tax from continuing operations 281 14 11
Income tax (expense) / benefit (59)    
Net result from continuing and discontinued operations 222 14 11
Inter-segment operating result 222 14 11
Revenues      
Insurance revenue (39) (45) (51)
Interest revenue on financial instruments calculated using the effective interest method (7) (11) (6)
Interest income from instruments measured at FVPL 0    
Other investment income (732) (475) (498)
Fee and commission income (147) (153) (158)
Total revenues (925) (684) (713)
Eliminations [member] | Insurance contracts - Direct participating contracts [member]      
Revenues      
Insurance revenue     € (51)
Eliminations [member] | Insurance contracts - Without direct participation contracts [member]      
Revenues      
Insurance revenue € (39) € (45)  
[1] The net result represents the standalone result of ‘The Netherlands’. After elimination, the remaining result is EUR (17). See note 45 Held for sale and discontinued operations in the annual report of 2023 for more details.