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Long-Term Debt (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Summary of Carrying value of long-term debt |  |
Debt issue costs | $ 22 | $ 22
Long-term debt | 998 | 998
Including Deferred Debt Issue Costs [Member] |  |
Summary of Carrying value of long-term debt |  |
Long-term debt | 1,020 | 1,020
Subsidiaries [Member] |  |
Summary of Carrying value of long-term debt |  |
Debt issue costs | 0 | 0
National Interstate bank credit facility | 12 | 12
Subsidiaries [Member] | Including Deferred Debt Issue Costs [Member] |  |
Summary of Carrying value of long-term debt |  |
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 | 349 | 349
Debt issue costs | 1 | 1
Senior Notes [Member] | 9-7/8% Senior Notes due June 2019 [Member] | AFG [Member] | Including Deferred Debt Issue Costs [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 | 223 | 223
Debt issue costs | 7 | 7
Senior Notes [Member] | 6-3/8% Senior Notes due June 2042 [Member] | AFG [Member] | Including Deferred Debt Issue Costs [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 | 121 | 121
Debt issue costs | 4 | 4
Senior Notes [Member] | 5-3/4% Senior Notes due August 2042 [Member] | AFG [Member] | Including Deferred Debt Issue Costs [Member] |  |
Summary of Carrying value of long-term debt |  |
Senior Notes | 125 | 125
Senior Debt Obligations [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Debt issue costs | 12 | 12
Long-term debt | 696 | 696
Senior Debt Obligations [Member] | AFG [Member] | Including Deferred Debt Issue Costs [Member] |  |
Summary of Carrying value of long-term debt |  |
Long-term debt | 708 | 708
Senior Debt Obligations [Member] | Other [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Other long-term debt | 3 | 3
Debt issue costs | 0 | 0
Senior Debt Obligations [Member] | Other [Member] | AFG [Member] | Including Deferred Debt Issue Costs [Member] |  |
Summary of Carrying value of long-term debt |  |
Other long-term debt | 3 | 3
Subordinated Debentures [Member] | 6-1/4% Subordinated Debentures due September 2054 [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Debt issue costs | 5 | 5
Subordinated Debentures | 145 | 145
Subordinated Debentures [Member] | 6-1/4% Subordinated Debentures due September 2054 [Member] | AFG [Member] | Including Deferred Debt Issue Costs [Member] |  |
Summary of Carrying value of long-term debt |  |
Subordinated Debentures | 150 | 150
Subordinated Debentures [Member] | 6% Subordinated Debentures due November 2055 [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Debt issue costs | 5 | 5
Subordinated Debentures | 145 | 145
Subordinated Debentures [Member] | 6% Subordinated Debentures due November 2055 [Member] | AFG [Member] | Including Deferred Debt Issue Costs [Member] |  |
Summary of Carrying value of long-term debt |  |
Subordinated Debentures | 150 | 150
Subordinated Debt Obligations [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Debt issue costs | 10 | 10
Long-term debt | 290 | 290
Subordinated Debt Obligations [Member] | AFG [Member] | Including Deferred Debt Issue Costs [Member] |  |
Summary of Carrying value of long-term debt |  |
Long-term debt | $ 300 | $ 300

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- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: 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 2: 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 + Details
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