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Note 10. Income Taxes Pre-tax Income (Loss) for Domestic and Foreign Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Domestic $ 365 $ 351 $ 290
Foreign 4 10 8
Pretax income (loss) $ 369 $ 361 $ 298