Debt (Narrative) (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Short-term borrowings	$ 0			$ 0		$ 0
Loss on early extinguishment of debt	$ 0	$ 228,000,000	$ 0	$ 228,000,000	$ 0
Debt Tender Premium and Fees		226,000,000
Write off of Unamortized Debt Discounts and Debt Issuance Costs		$ 2,000,000
Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rate		9.70%
Notes purchased		$ 793,000,000