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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Current Federal Tax Expense (Benefit) $ (686) $ (653) $ (743)
Current State and Local Tax Expense (Benefit) (9) (3) 1
Current foreign 104 83 55
Current Income Tax Expense (Benefit) (591) (573) (687)
Deferred Federal Income Tax Expense (Benefit) 165 (76) 1,164
Deferred foreign (20) 2 (7)
Deferred State and Local Income Tax Expense (Benefit) (131) 100 (59)
Deferred Income Tax Expense (Benefit) 14 26 1,098
Other Tax Expense (Benefit) (6) (7) (8)
Total income tax expense (benefit) $ (583) $ (554) $ 403