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Earnings per share (Narrative) (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Unvested restricted stock (in shares)	2,429,442	3,007,752	3,426,810
Number of shares excluded from diluted shares outstanding (in shares)	90,929	509,677	152,314

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock, Unvested

+ References

No definition available.

+ Details

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Namespace Prefix:	aer_
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Period Type:	instant

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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