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Significant Accounting Policies - Summary of Credit Risk Rating Grades (Detail) - EUR (€) € in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	€ 143,075	€ 135,925
Financial assets at amortised cost, class [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	127,988	120,436
Financial assets at amortised cost, class [member] | Shares - Carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	70	68
Financial assets at amortised cost, class [member] | Debt securities - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	82,014	76,283
Financial assets at amortised cost, class [member] | Money market and other short-term investments - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	2,724	3,126
Financial assets at amortised cost, class [member] | Mortgage loans - carried at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	38,524	36,639
Financial assets at amortised cost, class [member] | Private loans - held at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	4,479	4,068
Financial assets at amortised cost, class [member] | Other financial assets - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	177	252
Financial assets at amortised cost, class [member] | AAA [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	30,088	28,244
Financial assets at amortised cost, class [member] | AAA [member] | Debt securities - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	26,723	25,637
Financial assets at amortised cost, class [member] | AAA [member] | Money market and other short-term investments - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	255	55
Financial assets at amortised cost, class [member] | AAA [member] | Mortgage loans - carried at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	1,311	941
Financial assets at amortised cost, class [member] | AAA [member] | Private loans - held at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	1,799	1,611
Financial assets at amortised cost, class [member] | AA [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	12,933	12,670
Financial assets at amortised cost, class [member] | AA [member] | Debt securities - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	8,989	9,224
Financial assets at amortised cost, class [member] | AA [member] | Money market and other short-term investments - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	193	158
Financial assets at amortised cost, class [member] | AA [member] | Mortgage loans - carried at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	3,671	3,204
Financial assets at amortised cost, class [member] | AA [member] | Private loans - held at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	82	83
Financial assets at amortised cost, class [member] | A [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	26,111	23,510
Financial assets at amortised cost, class [member] | A [member] | Debt securities - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	20,112	17,057
Financial assets at amortised cost, class [member] | A [member] | Money market and other short-term investments - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	2,164	2,561
Financial assets at amortised cost, class [member] | A [member] | Mortgage loans - carried at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	3,580	3,567
Financial assets at amortised cost, class [member] | A [member] | Private loans - held at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	198	261
Financial assets at amortised cost, class [member] | A [member] | Other financial assets - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	57	64
Financial assets at amortised cost, class [member] | BBB [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	23,800	21,925
Financial assets at amortised cost, class [member] | BBB [member] | Shares - Carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	43	42
Financial assets at amortised cost, class [member] | BBB [member] | Debt securities - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	22,296	20,330
Financial assets at amortised cost, class [member] | BBB [member] | Money market and other short-term investments - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	112	351
Financial assets at amortised cost, class [member] | BBB [member] | Mortgage loans - carried at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	369	266
Financial assets at amortised cost, class [member] | BBB [member] | Private loans - held at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	970	924
Financial assets at amortised cost, class [member] | BBB [member] | Other financial assets - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	10	12
Financial assets at amortised cost, class [member] | BB [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	1,487	1,601
Financial assets at amortised cost, class [member] | BB [member] | Shares - Carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	27	9
Financial assets at amortised cost, class [member] | BB [member] | Debt securities - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	1,364	1,480
Financial assets at amortised cost, class [member] | BB [member] | Mortgage loans - carried at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	15	15
Financial assets at amortised cost, class [member] | BB [member] | Private loans - held at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	49	52
Financial assets at amortised cost, class [member] | BB [member] | Other financial assets - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	33	44
Financial assets at amortised cost, class [member] | B [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	1,285	1,237
Financial assets at amortised cost, class [member] | B [member] | Shares - Carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value		17
Financial assets at amortised cost, class [member] | B [member] | Debt securities - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	1,244	1,159
Financial assets at amortised cost, class [member] | B [member] | Mortgage loans - carried at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	4
Financial assets at amortised cost, class [member] | B [member] | Other financial assets - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	38	61
Financial assets at amortised cost, class [member] | CCC or lower [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	1,283	1,396
Financial assets at amortised cost, class [member] | CCC or lower [member] | Debt securities - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	1,283	1,395
Financial assets at amortised cost, class [member] | CCC or lower [member] | Other financial assets - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value		1
Financial assets at amortised cost, class [member] | Grade Not Rated [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	31,000	29,853
Financial assets at amortised cost, class [member] | Grade Not Rated [member] | Debt securities - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	3
Financial assets at amortised cost, class [member] | Grade Not Rated [member] | Mortgage loans - carried at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	29,574	28,647
Financial assets at amortised cost, class [member] | Grade Not Rated [member] | Private loans - held at amortized cost [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	1,383	1,136
Financial assets at amortised cost, class [member] | Grade Not Rated [member] | Other financial assets - carried at fair value [member]
Disclosure of group limits per credit rating [line items]
Financial assets at carrying value	€ 40	€ 70

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- Definition

Disclosure of group limits per credit rating.

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

+ References

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