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Commitments and contingencies (Movements in prepayments on flight equipment) (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Deposits on Flight Equipment [Roll Forward] |  |
Prepayments on flight equipment at beginning of period | $ 2,111,659 | $ 2,954,478
Prepayments during the period, net | 88,063 | 685,051
Interest paid and capitalized during the period | 10,331 | 31,830
Prepayments and capitalized interest applied to the purchase of flight equipment | (338,237) | (301,263)
Prepayments on flight equipment at end of period | $ 1,871,816 | $ 3,370,096

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- Definition Deposits on Flight Equipment + References No definition available. + Details
Name: | aer_DepositsonFlightEquipmentRollForward
Namespace Prefix: | aer_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | aer_PrepaymentsOnFlightEquipmentAdditionsAdvancePayments
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
Name: | aer_PrepaymentsOnFlightEquipmentAdditionsInterestCapitalized
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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
- 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