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Variable interest entities - Narrative (Details) - Variable interest entity, primary beneficiary - AerFunding
$ in Billions
6 Months Ended
Jun. 30, 2025
USD ($)
Variable Interest Entity [Line Items]  
Ownership (in percentage) 5.00%
Subordinated notes, ownership, percentage 100.00%
Long-term line of credit $ 1.0
Senior notes $ 2.1