Equity Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended	9 Months Ended		63 Months Ended
	May. 18, 2015	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased During Period, Shares		8.4			137.9
Stock Repurchased During Period, Value		$ 101	$ 408	$ 140	$ 1,700
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 16	$ 16		$ 16
Treasury Stock Acquired, Average Cost Per Share					$ 12.44
share repurchase program CIC buyback [Domain]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased During Period, Shares	20.0
Stock Repurchased During Period, Value	$ 261
Treasury Stock Acquired, Average Cost Per Share	$ 13.07