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Employees - Schedule of Fair Value of Plans Assets, Which Are Reported Net of Fund Liabilities That Are Not Employee Benefits (Detail) - EUR (€) € in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Total plan assets | € 24,023 | € 23,749
Equities total | 8,184 | 7,756
Fixed income total | 11,693 | 11,362
Private equity | 347 | 396
Property and real estate | 1,623 | 1,728
Hedge funds | 380 | 757
Other | 1,167 | 1,158
Other plans | 370 | 300
Derivatives | 259 | 292
Government Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 5,457 | 4,845
Investment Grade Corporate Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 2,818 | 2,934
Other fixed income [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 3,418 | 3,583
Europe [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 1,864 | 2,030
North America [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 4,381 | 3,844
Other Countries [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 1,939 | 1,882
United Kingdom [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Total plan assets | 12,499 | 12,122
Equities total | 4,653 | 4,173
Fixed income total | 5,819 | 5,317
Private equity | 274 | 325
Property and real estate | 835 | 916
Hedge funds | 318 | 688
Other | 470 | 454
Derivatives | 130 | 249
United Kingdom [Member] | Government Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 3,292 | 2,711
United Kingdom [Member] | Investment Grade Corporate Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 1,167 | 1,120
United Kingdom [Member] | Other fixed income [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 1,360 | 1,486
United Kingdom [Member] | Europe [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 921 | 930
United Kingdom [Member] | North America [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 2,740 | 2,312
United Kingdom [Member] | Other Countries [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 992 | 931
Netherlands [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Total plan assets | 5,587 | 5,522
Equities total | 1,837 | 1,831
Fixed income total | 2,766 | 2,795
Private equity | 64 | 65
Property and real estate | 456 | 491
Other | 320 | 289
Derivatives | 144 | 51
Netherlands [Member] | Government Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 798 | 765
Netherlands [Member] | Investment Grade Corporate Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 540 | 542
Netherlands [Member] | Other fixed income [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 1,428 | 1,488
Netherlands [Member] | Europe [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 437 | 517
Netherlands [Member] | North America [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 894 | 825
Netherlands [Member] | Other Countries [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 506 | 489
Rest of The World [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Total plan assets | 5,937 | 6,105
Equities total | 1,694 | 1,752
Fixed income total | 3,108 | 3,250
Private equity | 9 | 6
Property and real estate | 332 | 321
Hedge funds | 62 | 69
Other | 377 | 415
Other plans | 370 | 300
Derivatives | (15) | (8)
Rest of The World [member] | Government Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 1,367 | 1,369
Rest of The World [member] | Investment Grade Corporate Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 1,111 | 1,272
Rest of The World [member] | Other fixed income [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 630 | 609
Rest of The World [member] | Europe [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 506 | 583
Rest of The World [member] | North America [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 747 | 707
Rest of The World [member] | Other Countries [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | € 441 | € 462

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- Definition The amount instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 142 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_142_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount instruments representing equity (rather than debt) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 142 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_142_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount other types of assets not separately disclosed contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 142 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_142&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount real estate contributes to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 142 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_142_d&doctype=Standard -URIDate 2020-01-01 + Details
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