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Income Taxes - Income Tax Expense (Benefit), Current Deferred, by Jurisdiction (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Current Federal Tax (Benefit) Expense $ 35 $ 4 $ (116)
Deferred Federal Income Tax Expense (62) (233) (132)
Current Foreign Tax Expense 41 25 31
Deferred Foreign Income Tax Expense (Benefit) (6) (3) (3)
Current State Tax Expense 20 8 1
Deferred State Income Tax Expense (7) 6 (25)
Total Benefit $ 21 $ (193) $ (244)