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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, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Total plan assets | € 20,867 | € 22,361
Equities total | 6,281 | 8,323
Fixed income total | 10,505 | 9,664
Private equity | 447 | 493
Property and real estate | 1,579 | 1,467
Hedge funds | 783 | 970
Other | 1,117 | 1,164
Other plans | 312 | 312
Derivatives | (157) | (32)
Government Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 4,496 | 4,417
Investment Grade Corporate Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 2,653 | 3,060
Other fixed income [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 3,356 | 2,187
Europe [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 1,662 | 2,390
North America [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 3,119 | 3,830
Other Countries [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 1,500 | 2,103
United Kingdom [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Total plan assets | 10,329 | 11,038
Equities total | 3,182 | 4,538
Fixed income total | 4,963 | 4,210
Private equity | 363 | 401
Property and real estate | 852 | 810
Hedge funds | 663 | 673
Other | 435 | 463
Derivatives | (129) | (57)
United Kingdom [Member] | Government Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 2,474 | 2,162
United Kingdom [Member] | Investment Grade Corporate Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 984 | 1,368
United Kingdom [Member] | Other fixed income [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 1,505 | 680
United Kingdom [Member] | Europe [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 731 | 1,093
United Kingdom [Member] | North America [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 1,723 | 2,320
United Kingdom [Member] | Other Countries [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 728 | 1,125
Netherlands [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Total plan assets | 4,996 | 5,357
Equities total | 1,594 | 1,876
Fixed income total | 2,595 | 2,500
Private equity | 82 | 89
Property and real estate | 451 | 411
Other | 293 | 427
Derivatives | (19) | 54
Netherlands [Member] | Government Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 769 | 879
Netherlands [Member] | Investment Grade Corporate Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 502 | 485
Netherlands [Member] | Other fixed income [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 1,324 | 1,136
Netherlands [Member] | Europe [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 480 | 703
Netherlands [Member] | North America [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 714 | 668
Netherlands [Member] | Other Countries [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 400 | 505
All other countries [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Total plan assets | 5,542 | 5,966
Equities total | 1,505 | 1,909
Fixed income total | 2,947 | 2,954
Private equity | 2 | 3
Property and real estate | 276 | 246
Hedge funds | 120 | 297
Other | 389 | 274
Other plans | 312 | 312
Derivatives | (9) | (29)
All other countries [member] | Government Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 1,253 | 1,376
All other countries [member] | Investment Grade Corporate Bonds [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 1,167 | 1,207
All other countries [member] | Other fixed income [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Fixed income total | 527 | 371
All other countries [member] | Europe [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 451 | 594
All other countries [member] | North America [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | 682 | 842
All other countries [member] | Other Countries [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equities total | € 372 | € 473

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- Definition The amount that other types of assets not separately disclosed constitute of 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 2017-01-01 -Paragraph 142 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_142&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount that real estate constitutes of 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 2017-01-01 -Paragraph 142 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_142_d&doctype=Standard -URIDate 2017-03-09 + Details
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