Income Taxes Income Taxes - Income Tax Provision (Benefit) Table (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)	$ (14)	$ 0	$ 0
Current State and Local Tax Expense (Benefit)	(5)	(36)	47
Current Income Tax Expense (Benefit)	(19)	(36)	47
Deferred Federal Income Tax Expense (Benefit)	(147)	(4,385)	1,115
Deferred State and Local Income Tax Expense (Benefit)	(24)	(42)	(18)
Deferred Income Tax Expense (Benefit)	(171)	(4,427)	1,097
Total Income Tax Expense (Benefit)	$ (190)	$ (4,463)	$ 1,144