Income Taxes (Income Tax Expense (Benefit)) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Tax Contingency [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	$ 9,000,000		$ 9,000,000
Income tax (expense) benefit	(15,000,000)	48,000,000	4,000,000	98,000,000
Effective Income Tax Rate, Continuing Operations	10.00%	41.00%	(3.00%)	33.00%
Unrecognized Tax Benefits	67,000,000		67,000,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	16,000,000		16,000,000
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward	51,000,000		51,000,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	13,000,000		13,000,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	$ 0		$ 0