Earnings/(loss) per share - Narrative (Details) - shares	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings per share [abstract]
Antidilutive securities (in shares)	0	0	0

Instruments With Potential Future Dilutive Effect Not Included In Calculation Of Diluted Earnings Per Share

No definition available.

Name:	stellantis_InstrumentsWithPotentialFutureDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShare
Namespace Prefix:	stellantis_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration