Segment Informaton - Special Item Charge (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Extinguishment of Debt [Line Items]
Extinguishment of Debt, Gain (Loss) Before Tax			$ (100,000,000)	$ 0
Uncollateralized Debt [Member]
Extinguishment of Debt [Line Items]
Extinguishment of Debt, Gain (Loss) Before Tax	$ (100,000,000)	$ 0	(100,000,000)	0
Extinguishment of Debt, Gain (Loss), Net of Tax	$ (65,000,000)	$ 0	$ (65,000,000)	$ 0