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Allowance for credit losses - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Allowance For Credit Loss [Line Items]
Increase in allowance for credit loss	$ (1,000)
Write-offs charged against the allowance	$ 36,883	$ 68,171
Ukraine conflict
Allowance For Credit Loss [Line Items]
Increase in allowance for credit loss		$ 75,800

X

- Definition

Allowance For Credit Loss

+ References

No definition available.

+ Details

Name:	aer_AllowanceForCreditLossLineItems
Namespace Prefix:	aer_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Allowance for Credit Loss, Period Increase (Decrease)

+ References

No definition available.

+ Details

Name:	aer_AllowanceForCreditLossPeriodIncreaseDecrease
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Allowance for Credit Loss, Writeoff

+ References

No definition available.

+ Details

Name:	aer_AllowanceForCreditLossWriteoff
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=aer_UkraineConflictMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: