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Long-Term Debt (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Summary of Carrying value of long-term debt |  |
Long-term debt | $ 1,024 | $ 1,061
AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Other long-term debt | 3 | 3
Long-term debt | 840 | 840
Subsidiaries [Member] |  |
Summary of Carrying value of long-term debt |  |
Long-term debt | 34 | 71
Notes payable secured by real estate due 2015 through 2016 | 22 | 59
National Interstate bank credit facility | 12 | 12
Senior Notes [Member] | 9-7/8% Senior Notes due June 2019 [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Senior Notes | 350 | 350
Senior Notes [Member] | 6-3/8% Senior Notes due June 2042 [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Senior Notes | 230 | 230
Senior Notes [Member] | 5-3/4% Senior Notes due August 2042 [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Senior Notes | 125 | 125
Senior Notes [Member] | 7% Senior Notes due September 2050 [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Senior Notes | 132 | 132
Subordinated Debt [Member] | 6-1/4% Subordinated Debentures due September 2054 [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Subordinated Debentures | $ 150 | $ 150

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 + Details
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