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Financial Risks - Summary of Maturity Analysis Gross Undiscounted Contractual Cash Flows (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1]
--- | --- | --- | --- | --- | ---
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |  |  |  |
Trust pass-through securities | € 136 |  | € 133 | [1] | € 133
Subordinated loans | 2,207 |  | 1,389 | [1] | 764
Borrowings | 9,307 |  | 12,061 | [1] | 13,635
Investment contracts for account of policyholders | 18,594 |  | 18,048 | [1] | € 16,943
Lease liabilities | 311 | € 285 |  |  |
Contractual maturities of each category of financial liabilities [member] |  |  |  |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |  |  |  |
Trust pass-through securities | 218 |  | 223 |  |
Subordinated loans | 3,971 |  | 1,933 |  |
Borrowings | 10,397 |  | 14,174 |  |
Investment contracts | 19,895 |  | 19,077 |  |
Investment contracts for account of policyholders | 58,772 |  | 49,166 |  |
Lease liabilities | 331 |  |  |  |
Other financial liabilities | 8,245 |  | 8,457 |  |
Total financial liabilities (excluding investment/ insurance contracts) | 22,831 |  | 24,787 |  |
On demand [member] | Contractual maturities of each category of financial liabilities [member] |  |  |  |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |  |  |  |
Investment contracts | 14,281 |  | 13,305 |  |
Investment contracts for account of policyholders | 32,463 |  | 29,360 |  |
Other financial liabilities | 4,867 |  | 5,849 |  |
Total financial liabilities (excluding investment/ insurance contracts) | 4,867 |  | 5,849 |  |
Not later than 1 year [member] | Contractual maturities of each category of financial liabilities [member] |  |  |  |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |  |  |  |
Trust pass-through securities | 9 |  | 9 |  |
Subordinated loans | 109 |  | 66 |  |
Borrowings | 3,967 |  | 1,713 |  |
Investment contracts | 1,930 |  | 1,439 |  |
Investment contracts for account of policyholders | 26,298 |  | 19,670 |  |
Lease liabilities | 51 |  |  |  |
Other financial liabilities | 2,713 |  | 2,445 |  |
Total financial liabilities (excluding investment/ insurance contracts) | 6,798 |  | 4,234 |  |
1-5 years [member] | Contractual maturities of each category of financial liabilities [member] |  |  |  |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |  |  |  |
Trust pass-through securities | 36 |  | 36 |  |
Subordinated loans | 437 |  | 266 |  |
Borrowings | 4,202 |  | 8,136 |  |
Investment contracts | 1,888 |  | 1,831 |  |
Investment contracts for account of policyholders | 6 |  | 20 |  |
Lease liabilities | 120 |  |  |  |
Other financial liabilities | 313 |  | 81 |  |
Total financial liabilities (excluding investment/ insurance contracts) | 4,988 |  | 8,519 |  |
Over 5 through 10 years [member] | Contractual maturities of each category of financial liabilities [member] |  |  |  |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |  |  |  |
Trust pass-through securities | 106 |  | 110 |  |
Subordinated loans | 347 |  | 201 |  |
Borrowings | 1,109 |  | 1,499 |  |
Investment contracts | 1,001 |  | 985 |  |
Investment contracts for account of policyholders | 3 |  | 26 |  |
Lease liabilities | 66 |  |  |  |
Other financial liabilities | 96 |  | 45 |  |
Total financial liabilities (excluding investment/ insurance contracts) | 1,658 |  | 1,854 |  |
Over 10 years [member] | Contractual maturities of each category of financial liabilities [member] |  |  |  |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |  |  |  |
Trust pass-through securities | 67 |  | 69 |  |
Subordinated loans | 3,077 |  | 1,400 |  |
Borrowings | 1,119 |  | 2,825 |  |
Investment contracts | 795 |  | 1,517 |  |
Investment contracts for account of policyholders | 2 |  | 91 |  |
Lease liabilities | 92 |  |  |  |
Other financial liabilities | 257 |  | 38 |  |
Total financial liabilities (excluding investment/ insurance contracts) | € 4,520 |  | € 4,332 |  |
[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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