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Mortgage Loans on Real Estate (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Performing	$ 3,458,914	$ 2,952,464
In workout	0	0
Collateral dependent	0	0
Principal outstanding	$ 3,458,914	$ 2,952,464	$ 2,674,315

X

- Definition

Mortgage loans on real estate at the reporting date that are not performing and will probably be satisfied by taking ownership of the real estate serving as collateral.

+ References

No definition available.

+ Details

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Namespace Prefix:	ael_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Mortgage loans that are in a workout period at the end of the reporting period. Workouts are payment periods that are not in compliance with original loan agreement, such as interest only periods, no debt service payment periods, or escrowing principal portion of payments to be used for capital improvements.

+ References

No definition available.

+ Details

Name:	ael_MortgageLoansOnRealEstateInWorkout
Namespace Prefix:	ael_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Mortgage loans that are in compliance with contractual terms at end of period.

+ References

No definition available.

+ Details

Name:	ael_MortgageLoansOnRealEstatePerforming
Namespace Prefix:	ael_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Amount, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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