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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