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Long-Term Debt - Schedule of long-term debt (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Summary of Carrying value of long-term debt |  |
Principal | $ 1,326 | $ 1,020
Discount and Issue Costs | (26) | (22)
Carrying Value | 1,300 | 998
Senior Notes | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 1,008 | 708
Discount and Issue Costs | (16) | (12)
Carrying Value | 992 | 696
Senior Notes | 9-7/8% Senior Notes due June 2019 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 350 | 350
Discount and Issue Costs | (1) | (1)
Carrying Value | 349 | 349
Senior Notes | 3-1/2% Senior Notes due August 2026 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 300 | 0
Discount and Issue Costs | (4) | 0
Carrying Value | 296 | 0
Senior Notes | 6-3/8% Senior Notes due June 2042 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 230 | 230
Discount and Issue Costs | (7) | (7)
Carrying Value | 223 | 223
Senior Notes | 5-3/4% Senior Notes due August 2042 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 125 | 125
Discount and Issue Costs | (4) | (4)
Carrying Value | 121 | 121
Senior Notes | Other | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 3 | 3
Discount and Issue Costs | 0 | 0
Carrying Value | 3 | 3
Subordinated Debentures | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 300 | 300
Discount and Issue Costs | (10) | (10)
Carrying Value | 290 | 290
Subordinated Debentures | 6-1/4% Subordinated Debentures due September 2054 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 150 | 150
Discount and Issue Costs | (5) | (5)
Carrying Value | 145 | 145
Subordinated Debentures | 6% Subordinated Debentures due November 2055 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 150 | 150
Discount and Issue Costs | (5) | (5)
Carrying Value | 145 | 145
Revolving Credit Facility | National Interstate |  |
Summary of Carrying value of long-term debt |  |
Principal | 18 | 12
Discount and Issue Costs | 0 | 0
Carrying Value | $ 18 | $ 12

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: 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 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)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + 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=64930785&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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