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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Earnings before income taxes (“EBT”) | $ 639 | $ 724 | $ 787
Income taxes at statutory rate | 134 | 253 | 275
Effect of tax exempt interest | (13) | (23) | (24)
Effect of adjustments to prior year taxes | (8) | (4) | (2)
Effect of stock-based compensation | (8) | (16) | (9)
Effect of dividends received deduction | (4) | (8) | (7)
Effect of employee stock ownership plan dividend paid deduction | (3) | (5) | (2)
Effect of foreign operations | (2) | 21 | 5
Effect of change in valuation allowance (excluding change in tax rate) | 11 | (7) | 52
Effect of nondeductible expenses | 7 | 6 | 7
Effect of Neon restructuring | 0 | (56) | (111)
Effective of change in U.S. corporate tax rate | 0 | 83 | 0
Effect of acquisition of noncontrolling interest | 0 | 0 | (66)
Effect of subsidiaries not in AFG's tax return | 0 | 0 | 3
Effect of other income tax reconciliation | 8 | 3 | (2)
Provision for income taxes as shown in the Statement of Earnings | $ 122 | $ 247 | $ 119
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Income taxes at statutory rate as a percentage of EBT | 21.00% | 35.00% | 35.00%
Effect of tax exempt interest as a percentage of EBT | (2.00%) | (3.00%) | (3.00%)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent | (1.00%) | (1.00%) | 0.00%
Effect of stock-based compensation as a percentage of EBT | (1.00%) | (2.00%) | (1.00%)
Effect of dividend received deduction as a percentage of EBT | (1.00%) | (1.00%) | (1.00%)
Effect of employee stock ownership plan dividend paid deduction as a percentage of EBT | (1.00%) | (1.00%) | (0.00%)
Effect of foreign operations as a percentage of EBT | 0.00% | 3.00% | 0.00%
Effect of change in valuation allowance (excluding change in tax rate) as a percentage of EBT | 2.00% | (1.00%) | 7.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent | 1.00% | 1.00% | 1.00%
Effect of Neon restructuring as a percentage of EBT | 0.00% | (8.00%) | (14.00%)
Effective of change in U.S. corporate tax rate as a percentage of EBT | 0.00% | 11.00% | 0.00%
Effect of acquisition of noncontrolling interest as a percentage of EBT | 0.00% | 0.00% | (8.00%)
Effect of subsidiaries not in AFG's tax return as a percentage of EBT | 0.00% | 0.00% | 0.00%
Effect of other income tax reconciliation as a percentage of EBT | 1.00% | 1.00% | (1.00%)
Provision for income taxes as shown in the Statement of Earnings as a percentage of EBT | 19.00% | 34.00% | 15.00%

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