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Federal Income Taxes (Federal Income Tax Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income tax expense (benefit), continuing operations [Abstract]      
Current $ 91 $ 210 $ 88
Deferred 153 (1,159) 178
Federal income tax expense (benefit) $ 244 $ (949) $ 266