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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
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Earnings before income taxes (“EBT”) $ 787 $ 565 $ 626
Income taxes at statutory rate 275 198 219
Effect of tax exempt interest (24) (27) (25)
Effect of change in valuation allowance 52 23 7
Effect of stock-based compensation (9) 1 1
Effect of subsidiaries not in AFG's tax return 3 2 1
Effect of acquisition of noncontrolling interest (66) 0 0
Effect of Neon restructuring (111) 0 0
Effect of losses of managed investment entities 0 0 18
Effect of other income tax reconciliation (1) (2) (1)
Provision for income taxes as shown in the Statement of Earnings $ 119 $ 195 $ 220
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%) (5.00%) (4.00%)
Effect of change in valuation allowance as a percentage of EBT 7.00% 4.00% 1.00%
Effect of stock-based compensation as a percentage of EBT (1.00%) 0.00% 0.00%
Effect of subsidiaries not in AFG's tax return as a percentage of EBT 0.00% 1.00% 0.00%
Effect of acquisition of noncontrolling interest as a percentage of EBT (8.00%) 0.00% 0.00%
Effect of Neon restructuring as a percentage of EBT (14.00%) 0.00% 0.00%
Effect of losses of managed investment entities as a percentage of EBT 0.00% 0.00% 3.00%
Effect of other income tax reconciliation as a percentage of EBT (1.00%) 0.00% 0.00%
Provision for income taxes as shown in the Statement of Earnings as a percentage of EBT 15.00% 35.00% 35.00%