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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, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of fair value of plan assets [Line Items] |  |
Total plan assets | € 22,361 | € 21,162
Equities total | 8,323 | 8,133
Fixed income total | 9,664 | 10,282
Private equity | 493 | 634
Property and real estate | 1,467 | 1,461
Hedge funds | 970 | 1,171
Other | 1,164 | 591
Other plans | 312 | 336
Derivatives | (32) | (1,446)
Government Bonds [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Fixed income total | 4,417 | 5,326
Investment Grade Corporate Bonds [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Fixed income total | 3,060 | 2,927
Other fixed income [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Fixed income total | 2,187 | 2,029
Europe [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equities total | 2,390 | 2,197
North America [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equities total | 3,830 | 3,829
Other Countries [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equities total | 2,103 | 2,107
United Kingdom [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total plan assets | 11,038 | 9,963
Equities total | 4,538 | 4,418
Fixed income total | 4,210 | 4,727
Private equity | 401 | 504
Property and real estate | 810 | 830
Hedge funds | 673 | 687
Other | 463 | 246
Derivatives | (57) | (1,449)
United Kingdom [member] | Government Bonds [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Fixed income total | 2,162 | 2,774
United Kingdom [member] | Investment Grade Corporate Bonds [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Fixed income total | 1,368 | 1,361
United Kingdom [member] | Other fixed income [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Fixed income total | 680 | 592
United Kingdom [member] | Europe [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equities total | 1,093 | 1,065
United Kingdom [member] | North America [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equities total | 2,320 | 2,266
United Kingdom [member] | Other Countries [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equities total | 1,125 | 1,087
Netherlands [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total plan assets | 5,357 | 5,116
Equities total | 1,876 | 1,831
Fixed income total | 2,500 | 2,665
Private equity | 89 | 124
Property and real estate | 411 | 410
Hedge funds |  | 3
Other | 427 | 63
Derivatives | 54 | 20
Netherlands [member] | Government Bonds [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Fixed income total | 879 | 1,114
Netherlands [member] | Investment Grade Corporate Bonds [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Fixed income total | 485 | 438
Netherlands [member] | Other fixed income [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Fixed income total | 1,136 | 1,113
Netherlands [member] | Europe [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equities total | 703 | 623
Netherlands [member] | North America [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equities total | 668 | 698
Netherlands [member] | Other Countries [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equities total | 505 | 510
Rest of World [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total plan assets | 5,966 | 6,083
Equities total | 1,909 | 1,884
Fixed income total | 2,954 | 2,890
Private equity | 3 | 6
Property and real estate | 246 | 221
Hedge funds | 297 | 481
Other | 274 | 282
Other plans | 312 | 336
Derivatives | (29) | (17)
Rest of World [member] | Government Bonds [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Fixed income total | 1,376 | 1,438
Rest of World [member] | Investment Grade Corporate Bonds [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Fixed income total | 1,207 | 1,128
Rest of World [member] | Other fixed income [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Fixed income total | 371 | 324
Rest of World [member] | Europe [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equities total | 594 | 509
Rest of World [member] | North America [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equities total | 842 | 865
Rest of World [member] | Other Countries [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equities total | € 473 | € 510

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- Definition The amount that instruments representing debt (rather than equity) 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/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2016-01-13 -Paragraph 142 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_142_c&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount that derivatives constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2016-01-13 -Paragraph 142 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_142_e&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount that instruments representing equity (rather than debt) 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/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2016-01-13 -Paragraph 142 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_142_b&doctype=Standard -URIDate 2016-03-31 + Details
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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 2016-01-13 -Paragraph 142 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_142&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_57_a&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 142 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_142_d&doctype=Standard -URIDate 2016-03-31 + Details
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