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Deferred Policy Acquisition Costs | 12 Months Ended
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Dec. 31, 2017
Deferred Policy Acquisition Costs Disclosures [Abstract] |
Deferred Policy Acquisition Costs | Deferred Policy Acquisition Costs A progression of deferred policy acquisition costs is presented below (in millions):
| P&C |  |  | Annuity and Run-off Long-term Care and Life |  |  |
| Deferred |  |  | Deferred |  | Sales |  |  |  |  |  |  |  |  |  |  | Consolidated
| Costs |  |  | Costs |  | Inducements |  | PVFP |  | Subtotal |  | Unrealized (*) |  | Total |  |  | Total
Balance at December 31, 2014 | $ | 221 |  |  |  | $ | 925 |  |  | $ | 132 |  |  | $ | 74 |  |  | $ | 1,131 |  |  | $ | (531 | ) |  | $ | 600 |  |  |  | $ | 821 |
Additions | 519 |  |  |  | 224 |  |  | 11 |  |  | — |  |  | 235 |  |  | — |  |  | 235 |  |  |  | 754 |
Amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic amortization | (511 | ) |  |  | (162 | ) |  | (26 | ) |  | (11 | ) |  | (199 | ) |  | — |  |  | (199 | ) |  |  | (710 | )
Annuity unlocking | — |  |  |  | 31 |  |  | 4 |  |  | — |  |  | 35 |  |  | — |  |  | 35 |  |  |  | 35 |
Included in realized gains | — |  |  |  | 8 |  |  | 1 |  |  | — |  |  | 9 |  |  | — |  |  | 9 |  |  |  | 9 |
Sale of subsidiaries | — |  |  |  | (8 | ) |  | (3 | ) |  | (8 | ) |  | (19 | ) |  | — |  |  | (19 | ) |  |  | (19 | )
Foreign currency translation | (3 | ) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  | (3 | )
Change in unrealized | — |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 297 |  |  | 297 |  |  |  | 297 |
Balance at December 31, 2015 | 226 |  |  |  | 1,018 |  |  | 119 |  |  | 55 |  |  | 1,192 |  |  | (234 | ) |  | 958 |  |  |  | 1,184 |
Additions | 535 |  |  |  | 230 |  |  | 9 |  |  | — |  |  | 239 |  |  | — |  |  | 239 |  |  |  | 774 |
Amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic amortization | (520 | ) |  |  | (169 | ) |  | (24 | ) |  | (9 | ) |  | (202 | ) |  | — |  |  | (202 | ) |  |  | (722 | )
Annuity unlocking | — |  |  |  | 25 |  |  | 4 |  |  | — |  |  | 29 |  |  | — |  |  | 29 |  |  |  | 29 |
Included in realized gains | — |  |  |  | 6 |  |  | 2 |  |  | — |  |  | 8 |  |  | — |  |  | 8 |  |  |  | 8 |
Foreign currency translation | (3 | ) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  | (3 | )
Change in unrealized | — |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (31 | ) |  | (31 | ) |  |  | (31 | )
Balance at December 31, 2016 | 238 |  |  |  | 1,110 |  |  | 110 |  |  | 46 |  |  | 1,266 |  |  | (265 | ) |  | 1,001 |  |  |  | 1,239 |
Additions | 588 |  |  |  | 225 |  |  | 4 |  |  | — |  |  | 229 |  |  | — |  |  | 229 |  |  |  | 817 |
Amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic amortization | (556 | ) |  |  | (161 | ) |  | (19 | ) |  | (8 | ) |  | (188 | ) |  | — |  |  | (188 | ) |  |  | (744 | )
Annuity unlocking | — |  |  |  | 34 |  |  | 6 |  |  | 1 |  |  | 41 |  |  | — |  |  | 41 |  |  |  | 41 |
Included in realized gains | — |  |  |  | 9 |  |  | 1 |  |  | — |  |  | 10 |  |  | — |  |  | 10 |  |  |  | 10 |
Foreign currency translation | — |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  | — |
Other | — |  |  |  | — |  |  | — |  |  | 10 |  |  | 10 |  |  | — |  |  | 10 |  |  |  | 10 |
Change in unrealized | — |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (157 | ) |  | (157 | ) |  |  | (157 | )
Balance at December 31, 2017 | $ | 270 |  |  |  | $ | 1,217 |  |  | $ | 102 |  |  | $ | 49 |  |  | $ | 1,368 |  |  | $ | (422 | ) |  | $ | 946 |  |  |  | $ | 1,216 |
(*) | Unrealized adjustments to DPAC includes net unrealized gains/losses on securities and net unrealized gains/losses on cash flow hedges.
The present value of future profits (“PVFP”) amounts in the table above are net of $141 million and $134 million of accumulated amortization at December 31, 2017 and 2016, respectively. During each of the next five years, the PVFP is expected to decrease at a rate of approximately one-eighth of the balance at the beginning of each respective year.

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- Definition This element includes data and tables pertaining to (1) the nature and amount of capitalized costs incurred to write or acquire insurance contracts and the accounting for such deferred acquisition costs (DAC) and (2) the nature and amount of the present value of future profits (PVFP) of estimated net cash flows embedded in the existing long-duration contracts of acquired life insurance entities, the amount of amortization and other information pertinent to an understanding of PVFP, which is also known as Value of Business Acquired, or VOBA. + References No definition available. + Details
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Namespace Prefix: | afg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DeferredPolicyAcquisitionCostsDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration