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Accrued maintenance liability (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accrued Maintenance Liability [Line Items] |  |  |
Accrued maintenance liability at beginning of period | $ 1,750,395 | $ 2,190,159 |
Maintenance payments received | 448,516 | 345,699 |
Maintenance payments returned | (209,087) | (412,492) |
Release to income other than upon sale | (273,146) | (344,210) |
Lessor contribution, top ups and other | (30,456) | 66,281 |
Accrued maintenance liability at end of period | 2,900,651 | 1,750,395 | $ 2,190,159
Non-cash investing and financing activities |  |  |
Accrued Maintenance Liability [Line Items] |  |  |
Release to income upon sale | (20,428) | (95,042) | $ (249,200)
GE Capital Aviation Services |  |  |
Accrued Maintenance Liability [Line Items] |  |  |
GECAS Transaction | $ 1,234,857 | $ 0 |

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- Definition Obligation towards lessees for the periodic payments received from the lessee of supplemental maintenance rent which is calculated with reference to the utilization of airframes, engines and other major life-limited components during the lease. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accrued Maintenance Liability, Additions + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Accrued Maintenance Liability, Lessor Contribution And Top Ups + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Accrued Maintenance Liability [Line Items] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Accrued Maintenance Liability, Maintenance Payments Received + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Accrued Maintenance Liability, Maintenance Payments Reimbursed Or Released To Income + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Accrued Maintenance Liability, Release To Income Upon Redelivery Or Termination + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
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- Definition Accrued Maintenance Liability, Release To Income Upon Sale + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |