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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) - Pension plans - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of fair value of plan assets [line items]    
Total Assets € 19,361 € 26,686
Equities Total 2,630 5,225
Fixed Income Total 11,722 15,404
Private Equity 630 518
Property and Real Estate 1,739 1,894
Hedge Funds 301 456
Other 1,983 2,504
Other Plans 417 421
Derivatives (61) 264
Government bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 6,307 8,818
Investment grade corporate bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 2,306 2,806
Other Fixed Income    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 3,109 3,780
Europe    
Disclosure of fair value of plan assets [line items]    
Equities Total 666 1,192
North America    
Disclosure of fair value of plan assets [line items]    
Equities Total 1,358 2,860
Other    
Disclosure of fair value of plan assets [line items]    
Equities Total 606 1,173
UK    
Disclosure of fair value of plan assets [line items]    
Total Assets 8,704 14,332
Equities Total 284 1,714
Fixed Income Total 5,757 8,875
Private Equity 500 424
Property and Real Estate 930 1,021
Hedge Funds 225 381
Other 1,341 1,823
Other Plans 0 0
Derivatives (333) 94
UK | Government bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 3,795 6,243
UK | Investment grade corporate bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 871 1,160
UK | Other Fixed Income    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 1,091 1,472
UK | Europe    
Disclosure of fair value of plan assets [line items]    
Equities Total 61 352
UK | North America    
Disclosure of fair value of plan assets [line items]    
Equities Total 160 1,030
UK | Other    
Disclosure of fair value of plan assets [line items]    
Equities Total 63 332
The Netherlands    
Disclosure of fair value of plan assets [line items]    
Total Assets 5,343 6,099
Equities Total 983 1,676
Fixed Income Total 3,269 3,353
Private Equity 90 77
Property and Real Estate 422 517
Hedge Funds 0 0
Other 325 322
Other Plans 0 0
Derivatives 254 154
The Netherlands | Government bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 1,297 1,179
The Netherlands | Investment grade corporate bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 530 537
The Netherlands | Other Fixed Income    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 1,442 1,637
The Netherlands | Europe    
Disclosure of fair value of plan assets [line items]    
Equities Total 165 271
The Netherlands | North America    
Disclosure of fair value of plan assets [line items]    
Equities Total 604 1,001
The Netherlands | Other    
Disclosure of fair value of plan assets [line items]    
Equities Total 214 404
Rest of world    
Disclosure of fair value of plan assets [line items]    
Total Assets 5,314 6,255
Equities Total 1,363 1,835
Fixed Income Total 2,696 3,176
Private Equity 40 17
Property and Real Estate 387 356
Hedge Funds 76 75
Other 317 359
Other Plans 417 421
Derivatives 18 16
Rest of world | Government bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 1,215 1,396
Rest of world | Investment grade corporate bonds    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 905 1,109
Rest of world | Other Fixed Income    
Disclosure of fair value of plan assets [line items]    
Fixed Income Total 576 671
Rest of world | Europe    
Disclosure of fair value of plan assets [line items]    
Equities Total 440 569
Rest of world | North America    
Disclosure of fair value of plan assets [line items]    
Equities Total 594 829
Rest of world | Other    
Disclosure of fair value of plan assets [line items]    
Equities Total € 329 € 437