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Employees - Schedule of Fair Value of Plans Assets, Which Are Reported Net of Fund Liabilities That Are Not Employee Benefits (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of fair value of plan assets [line items]    
Total Assets € 26,686 € 24,023
Equities Total 5,225 8,184
Fixed Income Total 15,404 11,693
Private Equity 518 347
Property and Real Estate 1,894 1,623
Hedge Funds 456 380
Other 2,504 1,167
Other Plans 421 370
Derivatives 264 259
Government bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 8,818 5,457
Investment grade corporate bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 2,806 2,818
Other Fixed Income    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 3,780 3,418
Europe    
Disclosure of fair value of plan assets [line items]    
Equities Total 1,192 1,864
North America    
Disclosure of fair value of plan assets [line items]    
Equities Total 2,860 4,381
Other countries    
Disclosure of fair value of plan assets [line items]    
Equities Total 1,173 1,939
UK    
Disclosure of fair value of plan assets [line items]    
Total Assets 14,332 12,499
Equities Total 1,714 4,653
Fixed Income Total 8,875 5,819
Private Equity 424 274
Property and Real Estate 1,021 835
Hedge Funds 381 318
Other 1,823 470
Other Plans 0 0
Derivatives 94 130
UK | Government bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 6,243 3,292
UK | Investment grade corporate bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 1,160 1,167
UK | Other Fixed Income    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 1,472 1,360
UK | Europe    
Disclosure of fair value of plan assets [line items]    
Equities Total 352 921
UK | North America    
Disclosure of fair value of plan assets [line items]    
Equities Total 1,030 2,740
UK | Other countries    
Disclosure of fair value of plan assets [line items]    
Equities Total 332 992
The Netherlands    
Disclosure of fair value of plan assets [line items]    
Total Assets 6,099 5,587
Equities Total 1,676 1,837
Fixed Income Total 3,353 2,766
Private Equity 77 64
Property and Real Estate 517 456
Hedge Funds 0 0
Other 322 320
Other Plans 0 0
Derivatives 154 144
The Netherlands | Government bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 1,179 798
The Netherlands | Investment grade corporate bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 537 540
The Netherlands | Other Fixed Income    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 1,637 1,428
The Netherlands | Europe    
Disclosure of fair value of plan assets [line items]    
Equities Total 271 437
The Netherlands | North America    
Disclosure of fair value of plan assets [line items]    
Equities Total 1,001 894
The Netherlands | Other countries    
Disclosure of fair value of plan assets [line items]    
Equities Total 404 506
Rest of world    
Disclosure of fair value of plan assets [line items]    
Total Assets 6,255 5,937
Equities Total 1,835 1,694
Fixed Income Total 3,176 3,108
Private Equity 17 9
Property and Real Estate 356 332
Hedge Funds 75 62
Other 359 377
Other Plans 421 370
Derivatives 16 (15)
Rest of world | Government bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 1,396 1,367
Rest of world | Investment grade corporate bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 1,109 1,111
Rest of world | Other Fixed Income    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 671 630
Rest of world | Europe    
Disclosure of fair value of plan assets [line items]    
Equities Total 569 506
Rest of world | North America    
Disclosure of fair value of plan assets [line items]    
Equities Total 829 747
Rest of world | Other countries    
Disclosure of fair value of plan assets [line items]    
Equities Total € 437 € 441