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Consolidated Statements of Income (Unaudited) (Parenthetical) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Net securities gains (losses) $ 1,000,000 $ 1,000,000   $ (1,000,000)
Impaired losses related to securities 0 0
Net tax effect on income (loss) from discontinued operations $ 2,000,000 $ 2,000,000 $ 2,000,000 $ 5,000,000