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Financial Risks - Schedule of Credit Risk Concentration - Credit Rating (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
AAA [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | € 29,248 | € 29,511
AA [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 9,848 | 9,934
A [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 24,693 | 20,587
BBB [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 23,371 | 21,670
BB [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 1,524 | 1,638
B [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 1,280 | 1,207
CCC or lower [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 1,524 | 1,621
Assets not rated [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 691 | 1,391
A credit rating [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 92,180 | 87,560
Government bonds [member] | AAA [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 20,324 | 20,479
Government bonds [member] | AA [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 4,903 | 4,949
Government bonds [member] | A [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 899 | 614
Government bonds [member] | BBB [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 949 | 961
Government bonds [member] | BB [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 110 | 215
Government bonds [member] | B [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 297 | 136
Government bonds [member] | CCC or lower [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 18 | 1
Government bonds [member] | A credit rating [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 27,500 | 27,356
Corporate bonds [member] | AAA [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 719 | 772
Corporate bonds [member] | AA [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 3,514 | 3,264
Corporate bonds [member] | A [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 22,416 | 18,482
Corporate bonds [member] | BBB [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 22,137 | 20,360
Corporate bonds [member] | BB [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 1,292 | 1,279
Corporate bonds [member] | B [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 956 | 1,003
Corporate bonds [member] | CCC or lower [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 309 | 302
Corporate bonds [member] | Assets not rated [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 3 |
Corporate bonds [member] | A credit rating [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 51,347 | 45,462
RMBs CMBSs ABSs [member] | AAA [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 6,344 | 6,505
RMBs CMBSs ABSs [member] | AA [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 1,429 | 1,721
RMBs CMBSs ABSs [member] | A [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 1,378 | 1,490
RMBs CMBSs ABSs [member] | BBB [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 284 | 349
RMBs CMBSs ABSs [member] | BB [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 122 | 144
RMBs CMBSs ABSs [member] | B [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 27 | 69
RMBs CMBSs ABSs [member] | CCC or lower [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 1,197 | 1,318
RMBs CMBSs ABSs [member] | Assets not rated [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 3 |
RMBs CMBSs ABSs [member] | A credit rating [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 10,783 | 11,596
Other credit grades [member] | AAA [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 1,861 | 1,753
Other credit grades [member] | AA [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 2 |
Other credit grades [member] | A [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating |  | 1
Other credit grades [member] | BBB [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating |  | 1
Other credit grades [member] | Assets not rated [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | 686 | 1,391
Other credit grades [member] | A credit rating [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations credit rating | € 2,549 | € 3,147

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