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Income Taxes - Reconciliation of income taxes at the statutory rate to the provision for income taxes (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
Earnings before income taxes (“EBT”) | $ 223 | $ 156
Income taxes at statutory rate | 78 | 55
Effect of tax exempt interest | (6) | (7)
Effect of stock-based compensation | (6) | 0
Effect of change in valuation allowance | (2) | 1
Effect of subsidiaries not in AFG's tax return | 0 | 1
Effect of other income tax reconciliation | 4 | 2
Provision for income taxes as shown on the Statement of Earnings | $ 68 | $ 52
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |
Income taxes at statutory rate as a percentage of EBT | 35.00% | 35.00%
Effect of tax exempt interest as a percentage of EBT | (3.00%) | (4.00%)
Effect of stock-based compensation as a percentage of EBT | (3.00%) | 0.00%
Effect of change in valuation allowance as a percentage of EBT | (1.00%) | 1.00%
Effect of subsidiaries not in AFG's tax return as a percentage of EBT | 0.00% | 0.00%
Effect of other income tax reconciliation as a percentage of EBT | 2.00% | 1.00%
Provision for income taxes as shown on the Statement of Earnings as a percentage of EBT | 30.00% | 33.00%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + 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=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 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=65882285&loc=d3e32698-109319 + Details
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