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Discontinued operations and assets classified as held for sale - Net cash provided by (used for) discontinued operations (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Discontinued operations and assets classified as held for sale [Abstract]      
Cash flows from (used in) operating activities, discontinued operations € 123 € (27) € 85
Cash flows from (used in) investing activities, discontinued operations   15 3,319
Increase (decrease) in cash and cash equivalents, discontinued operations € 123 € (12) € 3,403