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Income Taxes - Reconciliation of income taxes at the statutory rate to the provision for income taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Earnings before income taxes (“EBT”) | $ 724 | $ 787 | $ 565
Income taxes at statutory rate | 253 | 275 | 198
Effect of tax exempt interest | (23) | (24) | (27)
Effect of dividends received deduction | (8) | (7) | (8)
Effect of stock-based compensation | (16) | (9) | 1
Effect of employee stock ownership plan dividend paid deduction | (5) | (2) | (1)
Effect of foreign operations | 21 | 5 | 3
Effect of change in valuation allowance (excluding change in tax rate) | (7) | 52 | 23
Effect of subsidiaries not in AFG's tax return | 0 | 3 | 2
Effect of Neon restructuring | (56) | (111) | 0
Effect of change in U.S corporate tax rate | 83 | 0 | 0
Effect of acquisition of noncontrolling interest | 0 | (66) | 0
Effect of other income tax reconciliation | 5 | 3 | 4
Provision for income taxes as shown in the Statement of Earnings | $ 247 | $ 119 | $ 195
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Income taxes at statutory rate as a percentage of EBT | 35.00% | 35.00% | 35.00%
Effect of tax exempt interest as a percentage of EBT | (3.00%) | (3.00%) | (5.00%)
Effect of dividend received deduction as a percentage of EBT | (1.00%) | (1.00%) | (1.00%)
Effect of stock-based compensation as a percentage of EBT | (2.00%) | (1.00%) | 0.00%
Effect of employee stock ownership plan dividend paid deduction as a percentage of EBT | (1.00%) | (0.00%) | (0.00%)
Effect of foreign operations as a percentage of EBT | 3.00% | 0.00% | 1.00%
Effect of change in valuation allowance (excluding change in tax rate) as a percentage of EBT | (1.00%) | 7.00% | 4.00%
Effect of subsidiaries not in AFG's tax return as a percentage of EBT | 0.00% | 0.00% | 0.00%
Effect of Neon restructuring as a percentage of EBT | (8.00%) | (14.00%) | 0.00%
Effect of change in U.S corporate tax rate as a percentage of EBT | 11.00% | 0.00% | 0.00%
Effect of acquisition of noncontrolling interest as a percentage of EBT | 0.00% | (8.00%) | 0.00%
Effect of other income tax reconciliation as a percentage of EBT | 1.00% | 0.00% | 1.00%
Provision for income taxes as shown in the Statement of Earnings as a percentage of EBT | 34.00% | 15.00% | 35.00%

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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: 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(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible equity-based compensation costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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