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Income Taxes - 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 - U.S. Federal	$ (18)	$ 116	$ 10
International	0	1	0
Total current	(18)	117	10
Deferred - U.S. Federal	286	866	(173)
International	0	2	(3)
Total deferred	286	868	(176)
Total income tax expense (benefit)	$ 268	$ 985	$ (166)

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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