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Long-Term Debt - Schedule of long-term debt (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Summary of Carrying value of long-term debt |  |
Principal | $ 1,303 | $ 1,308
Discount and Issue Costs | (19) | (25)
Carrying Value | 1,284 | 1,283
Senior Notes | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 1,003 | 1,008
Discount and Issue Costs | (9) | (15)
Carrying Value | 994 | 993
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 | 4.50% Senior Notes due June 2047 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 350 | 0
Discount and Issue Costs | (5) | 0
Carrying Value | 345 | 0
Senior Notes | 3.50% Senior Notes due August 2026 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 300 | 300
Discount and Issue Costs | (3) | (3)
Carrying Value | 297 | 297
Senior Notes | 6-3/8% Senior Notes due June 2042 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 0 | 230
Discount and Issue Costs | 0 | (7)
Carrying Value | 0 | 223
Senior Notes | 5-3/4% Senior Notes due August 2042 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 0 | 125
Discount and Issue Costs | 0 | (4)
Carrying Value | 0 | 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

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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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