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Commitments and contingencies (Movements in prepayments on flight equipment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract] |  |
Prepayments on flight equipment at beginning of period | $ 2,111,659 | $ 2,954,478
GECAS Transaction | 2,990,414 | 0
Prepayments and additions during the period, net | 136,655 | 270,032
Interest paid and capitalized during the period | 30,827 | 49,144
Prepayments and capitalized interest applied to the purchase of flight equipment | (682,707) | (1,161,995)
Prepayments on flight equipment at end of period | $ 4,586,848 | $ 2,111,659

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- Definition Amount of increase in the carrying amount of advance payments for the acquisition of forward order aircraft for advance payments made during the period. + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Prepayments On Flight Equipment Additions Due To Business Combination + References No definition available. + Details
Name: | aer_PrepaymentsOnFlightEquipmentAdditionsDueToBusinessCombination
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in the carrying amount of advance payments for the acquisition of forward order aircraft for interest that is capitalized during the period. + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of advance payments for the acquisition of forward order aircraft applied against the purchase of flight equipment during the period. Includes the related capitalized interest. + References No definition available. + Details
Name: | aer_PrepaymentsOnFlightEquipmentReductionsPurchaseOfFlightEquipment
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount, at the balance sheet date, of deposits made to the manufacturer for new flight equipment still under construction. May include capitalized interest. + References No definition available. + Details
Name: | us-gaap_DepositsOnFlightEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant