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Insurance - Liabilities for excess benefits expected to be paid on future deaths and annuitizations, guaranteed withdrawal benefits and accrued persistency and premium bonuses (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Insurance [Abstract] |  |
Expected death and annuitization | $ 232 | $ 229
Guaranteed withdrawal benefits | 625 | 472
Accrued persistency and premium bonuses | $ 1 | $ 1

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- Definition Amount of expected sales inducements that are to be recognized as part of the liability in excess of the projected account balances for persistency and premium bonuses without adjustments for anticipated lapses or decrements, as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | afg_
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of reserves required for contracts that provide additional benefits in excess of the projected account balances that are payable only upon future deaths and annuitizations, as of the balance sheet date. + References No definition available. + Details
Name: | afg_LiabilitiesForExcessBenefitsExpectedToBePaidOnFutureDeathsAndAnnuitizations
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts, as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=117418410&loc=d3e7104-158389 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=117420044&loc=d3e19393-158473 + Details
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