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Equity Equity (Stock Repurchases) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended 66 Months Ended
May. 18, 2015
Dec. 31, 2015
Dec. 31, 2013
Dec. 31, 2015
Equity, Class of Treasury Stock [Line Items]        
Sale of shares by noncontrolling interest, Shares 60.0      
Sale of shares by noncontrolling interest, per share $ 13.25      
Acquisition of treasury stock (shares)   39.7   145.6
Treasury Stock Acquired, Average Cost Per Share       $ 12.31
Treasury Stock, Value, Acquired, Cost Method   $ 0 $ 0 $ 1,800
share repurchase program CIC buyback [Domain]        
Equity, Class of Treasury Stock [Line Items]        
Acquisition of treasury stock (shares) 20.0      
Treasury Stock Acquired, Average Cost Per Share $ 13.07      
Treasury Stock, Value, Acquired, Cost Method $ 261      
Common Stock [Member]        
Equity, Class of Treasury Stock [Line Items]        
Sale of shares by noncontrolling interest, Shares 40.0