Income Taxes (Schedule of Significant Components of Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)									$ (3)	$ 0	$ 0
Current Foreign Tax Expense (Benefit)									8	4	(24)
Current State and Local Tax Expense (Benefit)									5	0	10
Current Income Tax Expense (Benefit)									10	4	(14)
Deferred Federal Income Tax Expense (Benefit)									270	(67)	(663)
Deferred Foreign Income Tax Expense (Benefit)									2	(1)	25
Deferred State and Local Income Tax Expense (Benefit)									39	5	(204)
Deferred Income Tax Expense (Benefit)									311	(63)	(842)
Income tax expense (benefit) from continuing operations	$ 36	$ 127	$ 64	$ 94	$ (4)	$ 28	$ 40	$ (123)	$ 321	$ (59)	$ (856)