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Long-Term Debt - Schedule of long-term debt (Details) - USD ($) $ in Millions | Jun. 30, 2020 | May 29, 2020 | Apr. 02, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Summary of Carrying value of long-term debt |  |  |  |
Principal | $ 1,943 |  |  | $ 1,493
Discount and Issue Costs | (31) |  |  | (20)
Carrying Value | 1,912 |  |  | 1,473
Senior Notes | AFG |  |  |  |
Summary of Carrying value of long-term debt |  |  |  |
Principal | 1,318 |  |  | 1,018
Discount and Issue Costs | (12) |  |  | (5)
Carrying Value | $ 1,306 |  |  | 1,013
Senior Notes | 4.50% Senior Notes due June 2047 | AFG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on debt instruments | 4.50% |  |  |
Summary of Carrying value of long-term debt |  |  |  |
Principal | $ 590 |  |  | 590
Discount and Issue Costs | (2) |  |  | (2)
Carrying Value | $ 588 |  |  | 588
Senior Notes | 3.50% Senior Notes due August 2026 | AFG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on debt instruments | 3.50% |  |  |
Summary of Carrying value of long-term debt |  |  |  |
Principal | $ 425 |  |  | 425
Discount and Issue Costs | (3) |  |  | (3)
Carrying Value | $ 422 |  |  | 422
Senior Notes | 5.25% Senior Notes due April 2030 | AFG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on debt instruments | 5.25% |  | 5.25% |
Summary of Carrying value of long-term debt |  |  |  |
Principal | $ 300 |  | $ 300 | 0
Discount and Issue Costs | (7) |  |  | 0
Carrying Value | 293 |  |  | 0
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 | 625 |  |  | 475
Discount and Issue Costs | (19) |  |  | (15)
Carrying Value | $ 606 |  |  | 460
Subordinated Debentures | 5.125% Subordinate Debentures due December 2059 | AFG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on debt instruments | 5.125% |  |  |
Summary of Carrying value of long-term debt |  |  |  |
Principal | $ 200 |  |  | 200
Discount and Issue Costs | (6) |  |  | (6)
Carrying Value | $ 194 |  |  | 194
Subordinated Debentures | 6% Subordinated Debentures due November 2055 | AFG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on debt instruments | 6.00% |  |  |
Summary of Carrying value of long-term debt |  |  |  |
Principal | $ 150 |  |  | 150
Discount and Issue Costs | (5) |  |  | (5)
Carrying Value | $ 145 |  |  | 145
Subordinated Debentures | 5.625% Subordinated Debentures due June 2060 | AFG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on debt instruments | 5.625% | 5.625% |  |
Summary of Carrying value of long-term debt |  |  |  |
Principal | $ 150 | $ 150 |  | 0
Discount and Issue Costs | (4) |  |  | 0
Carrying Value | $ 146 |  |  | 0
Subordinated Debentures | 5.875% Subordinated Debentures due March 2059 | AFG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on debt instruments | 5.875% |  |  |
Summary of Carrying value of long-term debt |  |  |  |
Principal | $ 125 |  |  | 125
Discount and Issue Costs | (4) |  |  | (4)
Carrying Value | $ 121 |  |  | $ 121

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