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Fair Value - Disclosures of Changes in Level 3 Assets (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance | [1] | € 392,633 |  |
Beginning balance | [1] | 370,091 |  |
Ending balance |  | 440,348 | € 392,633 | [1]
Ending balance |  | 415,907 | 370,091 | [1]
Real estate held for own use [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 263 |  |
Total gains /losses in income statement |  | 7 |  |
Total gains /losses in OCI |  | 3 |  |
Purchases |  | (5) |  |
Sales |  | (62) |  |
Net exchange difference |  | 3 |  |
Transfers to disposal groups |  | 0 |  |
Ending balance |  | 208 | 263 |
Level III [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 2,695 | 2,064 |
Total gains /losses in income statement |  | 605 | 604 |
Total gains /losses in OCI |  | 4 |  |
Purchases |  | 4 | 7 |
Sales |  | (46) | (14) |
Net exchange difference |  | 15 | 35 |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 3,278 | 2,695 |
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held |  | 75 | 614 |
Level III [member] | Investment contracts for account of policyholders [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 206 | 219 |
Total gains /losses in income statement |  | 9 | (10) |
Purchases |  | 4 | 7 |
Sales |  | (23) | (14) |
Net exchange difference |  | 1 | 4 |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 197 | 206 |
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held |  | (10) |  |
Level III [member] | Derivative [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 2,489 | 1,845 |
Total gains /losses in income statement |  | 597 | 613 |
Total gains /losses in OCI |  | 4 |  |
Sales |  | (22) |  |
Net exchange difference |  | 13 | 31 |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 3,081 | 2,489 |
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held |  | 84 | 613 |
Level III [member] | Recurring fair value measurement [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 10,077 | 9,130 |
Acquisition through business combinations |  |  | 130 |
Disposal of a business |  |  | (1) |
Total gains /losses in income statement |  | 379 | 435 |
Total gains /losses in OCI |  | (37) | (87) |
Purchases |  | 3,509 | 2,570 |
Sales |  | (2,880) | (1,624) |
Settlements |  | (194) | (472) |
Net exchange difference |  | 122 | 185 |
Reclassification |  |  | 42 |
Transfers from levels I and II |  | 263 | 151 |
Transfers to levels I and II |  | (517) | (382) |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 10,722 | 10,077 |
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held |  | 179 | 388 |
Level III [member] | Recurring fair value measurement [member] | Real estate held for own use [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 263 | 307 |
Disposal of a business |  |  | (1) |
Total gains /losses in income statement |  | 7 | (19) |
Total gains /losses in OCI |  | 3 | (39) |
Purchases |  | (5) | 17 |
Sales |  | (62) | (10) |
Settlements |  | 0 |  |
Net exchange difference |  | 3 | 7 |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 208 | 263 |
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held |  |  | 5 |
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 1,976 | 2,318 |
Total gains /losses in income statement |  | (97) | (36) |
Total gains /losses in OCI |  | (40) | (48) |
Purchases |  | 1,584 | 629 |
Sales |  | (1,297) | (255) |
Settlements |  | (194) | (473) |
Net exchange difference |  | 32 | 87 |
Reclassification |  | 1 | 6 |
Transfers from levels I and II |  | 178 | 58 |
Transfers to levels I and II |  | (431) | (310) |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 1,712 | 1,976 |
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Money markets and other short term instruments [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Purchases |  | 1,061 |  |
Sales |  | (855) |  |
Settlements |  | (103) |  |
Transfers from levels I and II |  | 126 |  |
Transfers to levels I and II |  | (229) |  |
Transfers to disposal groups |  | 0 |  |
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Shares [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 241 | 288 |
Total gains /losses in income statement |  |  | 21 |
Total gains /losses in OCI |  | (5) | (12) |
Purchases |  | 22 | 9 |
Sales |  | (100) | (77) |
Net exchange difference |  | 4 | 10 |
Reclassification |  | 2 | 2 |
Transfers to levels I and II |  | (7) |  |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 157 | 241 |
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Debt securities [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 1,242 | 1,447 |
Total gains /losses in income statement |  | 3 | 26 |
Total gains /losses in OCI |  | 21 | 2 |
Purchases |  | 319 | 494 |
Sales |  | (317) | (76) |
Settlements |  | (68) | (452) |
Net exchange difference |  | 19 | 51 |
Reclassification |  | (2) | 1 |
Transfers from levels I and II |  | 52 | 58 |
Transfers to levels I and II |  | (195) | (310) |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 1,074 | 1,242 |
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Other investments [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 493 | 583 |
Total gains /losses in income statement |  | (100) | (83) |
Total gains /losses in OCI |  | (56) | (38) |
Purchases |  | 183 | 125 |
Sales |  | (25) | (102) |
Settlements |  | (23) | (21) |
Net exchange difference |  | 9 | 25 |
Reclassification |  |  | 3 |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 482 | 493 |
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 7,837 | 6,506 |
Acquisition through business combinations |  |  | 130 |
Total gains /losses in income statement |  | 468 | 490 |
Purchases |  | 1,931 | 1,924 |
Sales |  | (1,521) | (1,360) |
Settlements |  | (1) |  |
Net exchange difference |  | 88 | 90 |
Reclassification |  | (1) | 36 |
Transfers from levels I and II |  | 85 | 94 |
Transfers to levels I and II |  | (86) | (72) |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 8,802 | 7,837 |
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held |  | 179 | 383 |
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Shares [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 1,226 | 604 |
Total gains /losses in income statement |  | 72 | 104 |
Purchases |  | 368 | 541 |
Sales |  | (266) | (61) |
Settlements |  |  | 1 |
Net exchange difference |  | 1 | 1 |
Reclassification |  |  | 36 |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 1,401 | 1,226 |
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held |  | 62 | 105 |
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Debt securities [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 17 | 4 |
Total gains /losses in income statement |  | (1) | (25) |
Purchases |  | 1 | 37 |
Sales |  | (12) |  |
Settlements |  | (1) |  |
Reclassification |  | (1) |  |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 4 | 17 |
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held |  |  | (24) |
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Other investments [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 1,376 | 1,255 |
Total gains /losses in income statement |  | 34 | 11 |
Purchases |  | 884 | 332 |
Sales |  | (268) | (307) |
Net exchange difference |  | 23 | 64 |
Transfers from levels I and II |  | 85 | 94 |
Transfers to levels I and II |  | (86) | (72) |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 2,049 | 1,376 |
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held |  | 36 | 3 |
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investment contracts for account of policyholders [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 1,871 | 1,784 |
Acquisition through business combinations |  |  | 130 |
Total gains /losses in income statement |  | 45 | 76 |
Purchases |  | 435 | 537 |
Sales |  | (567) | (660) |
Net exchange difference |  | 20 | 3 |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 1,805 | 1,871 |
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held |  | 86 | 35 |
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Derivatives [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 35 | 57 |
Total gains /losses in income statement |  | 19 | 57 |
Purchases |  | 35 |  |
Sales |  | (33) | (80) |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 56 | 35 |
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held |  | 20 | 59 |
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 2,700 | 2,147 |
Total gains /losses in income statement |  | 317 | 261 |
Purchases |  | 206 | 474 |
Sales |  | (331) | (209) |
Net exchange difference |  | 9 | 27 |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 2,901 | 2,700 |
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held |  | 2 | 202 |
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate for policyholders [member] |  |  |  |
Changes in fair value measurement assets and liabilities [Line Items] |  |  |  |
Beginning balance |  | 612 | 655 |
Total gains /losses in income statement |  | (18) | 5 |
Purchases |  | 2 | 2 |
Sales |  | (43) | (43) |
Net exchange difference |  | 34 | (7) |
Transfers to disposal groups |  | 0 | 0 |
Ending balance |  | 586 | 612 |
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held |  | € (27) | € 4 |
[1] | Amounts have been restated to reflect voluntary changes in accounting policies related to liability adequacy testing that was adopted by Aegon effective January 1, 2019. Refer to note 2.1.2 Voluntary changes in accounting policies for details about this change.

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