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Taxation - Summary of Tax Charges in Income Statement (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current tax      
Current year € (2,261) € (2,206) € (2,399)
Over/(under) provided in prior years 9 (61) 245
Current tax (expense) income (2,252) (2,267) (2,154)
Deferred tax      
Origination and reversal of temporary differences 22 153 189
Changes in tax rates 7 28 15
Recognition of previously unrecognised losses brought forward 24 18 15
Deferred tax (expense) income 53 199 219
Total tax (expense) income € (2,199) € (2,068) € (1,935)