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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