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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

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- 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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- 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
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Namespace Prefix: | ael_
Data Type: | xbrli:monetaryItemType
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- Definition Mortgage loans that are in compliance with contractual terms at end of period. + 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 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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration