Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ (59,000,000)
Federal Statutory Income Tax Rate, Percent	35.00%
Income (Loss) from Continuing Operations Before Income Taxes, Domestic	$ (1,771,000,000)	$ 165,000,000	$ 259,000,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign	0	0	$ 0
Unrecognized Tax Benefits	$ 0	$ 0