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Investments - Schedule of sources of net investment income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net Investment Income [Line Items] |  |  |  |
Gross investment income |  | $ 2,325 | $ 2,116 | $ 1,852
Investment expenses |  | (22) | (22) | (21)
Net investment income |  | 2,303 | 2,094 | 1,831
Fixed maturities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income |  | 1,915 | 1,742 | 1,607
Equity in earnings of partnerships and similar investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income |  | 154 | 161 | 64
Other |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income |  | 132 | 112 | 102
Investment income | Equity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income |  | 85 | 79 | 73
Accounting Standards Update 2016-01 | Equity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | [1] | $ 39 | $ 22 | $ 6
[1] | Although the change in the fair value of the majority of AFG’s equity securities is recorded in realized gains (losses) on securities, AFG records holding gains and losses in net investment income on equity securities classified as “trading” under previous guidance and on a small portfolio of limited partnership and similar investments that do not qualify for the equity method of accounting.

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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