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Long-Term Debt (Tables) | 3 Months Ended
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Mar. 31, 2016
Debt Disclosure [Abstract] |
Schedule of long-term debt instruments | Long-term debt consisted of the following (in millions):
| March 31, 2016 |  | December 31, 2015
| Principal |  | Debt Issue Costs |  | Carrying Value |  | Principal |  | Debt Issue Costs |  | Carrying Value
Direct Senior Obligations of AFG: |  |  |  |  |  |  |  |  |  |  |
9-7/8% Senior Notes due June 2019 | $ | 350 |  |  | $ | (1 | ) |  | $ | 349 |  |  | $ | 350 |  |  | $ | (1 | ) |  | $ | 349 |
6-3/8% Senior Notes due June 2042 | 230 |  |  | (7 | ) |  | 223 |  |  | 230 |  |  | (7 | ) |  | 223 |
5-3/4% Senior Notes due August 2042 | 125 |  |  | (4 | ) |  | 121 |  |  | 125 |  |  | (4 | ) |  | 121 |
Other | 3 |  |  | — |  |  | 3 |  |  | 3 |  |  | — |  |  | 3 |
| 708 |  |  | (12 | ) |  | 696 |  |  | 708 |  |  | (12 | ) |  | 696 |
Direct Subordinated Obligations of AFG: |  |  |  |  |  |  |  |  |  |  |
6-1/4% Subordinated Debentures due September 2054 | 150 |  |  | (5 | ) |  | 145 |  |  | 150 |  |  | (5 | ) |  | 145 |
6% Subordinated Debentures due November 2055 | 150 |  |  | (5 | ) |  | 145 |  |  | 150 |  |  | (5 | ) |  | 145 |
| 300 |  |  | (10 | ) |  | 290 |  |  | 300 |  |  | (10 | ) |  | 290 |
Subsidiaries: |  |  |  |  |  |  |  |  |  |  |
National Interstate bank credit facility | 12 |  |  | — |  |  | 12 |  |  | 12 |  |  | — |  |  | 12 |
| $ | 1,020 |  |  | $ | (22 | ) |  | $ | 998 |  |  | $ | 1,020 |  |  | $ | (22 | ) |  | $ | 998 |
Summary of secured and unsecured long-term debt | As shown below (principal amount, in millions), the majority of AFG’s long-term debt is unsecured obligations of the holding company and its subsidiaries:
| March 31, 2016 |  | December 31, 2015
Senior unsecured obligations | $ | 720 |  |  | $ | 720 |
Subordinated unsecured obligations | 300 |  |  | 300 |
| $ | 1,020 |  |  | $ | 1,020 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + 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 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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