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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |
Earnings before income taxes (“EBT”) | $ 29 | $ 178 | $ 457 | $ 470
Income taxes at statutory rate | 10 | 63 | 160 | 165
Effect of stock-based compensation | (1) | 0 | (14) | 0
Effect of tax exempt interest | (5) | (5) | (17) | (18)
Effect of dividends received deduction | (2) | (1) | (6) | (5)
Effect of employee stock ownership plan dividends paid deduction | 0 | 0 | (2) | (1)
Effect of change in valuation allowance | 16 | 7 | 16 | 40
Effect of subsidiaries not in AFG's tax return | 0 | 2 | 0 | 4
Effect of other income tax reconciliation | 0 | (1) | 9 | 5
Provision for income taxes as shown on the Statement of Earnings | $ 18 | $ 65 | $ 146 | $ 190
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |
Income taxes at statutory rate as a percentage of EBT | 35.00% | 35.00% | 35.00% | 35.00%
Effect of stock-based compensation as a percentage of EBT | (3.00%) | 0.00% | (3.00%) | 0.00%
Effect of tax exempt interest as a percentage of EBT | (17.00%) | (3.00%) | (4.00%) | (4.00%)
Effect of dividends received deduction as a percentage of EBT | (7.00%) | (1.00%) | (1.00%) | (1.00%)
Effect of employee stock ownership plan dividends paid deduction as a percentage of EBT | (0.00%) | (0.00%) | (0.00%) | (0.00%)
Effect of change in valuation allowance as a percentage of EBT | 55.00% | 4.00% | 4.00% | 9.00%
Effect of subsidiaries not in AFG's tax return as a percentage of EBT | 0.00% | 1.00% | 0.00% | 1.00%
Effect of other income tax reconciliation as a percentage of EBT | (1.00%) | 1.00% | 1.00% | 0.00%
Provision for income taxes as shown on the Statement of Earnings as a percentage of EBT | 62.00% | 37.00% | 32.00% | 40.00%

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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=84230637&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=84230637&loc=d3e32698-109319 + Details
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