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Stockholders' Equity - Changes in Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 1,109 $ 1,426 $ 1,180 $ 1,413
Total comprehensive income (loss) 66 (21) 142 122
Preferred stock dividends 0 (2) 0 (7)
Common stock dividends (9) (7) (27) (23)
Distributions to noncontrolling interests (2) (1) (8) (8)
Share conversion     0 3
Common stock share repurchases (119) (68) (245) (181)
Derecognition of noncontrolling interests     (5) 0
Stock compensation 7 6 17 16
Stock withheld for employee taxes (1) 0 (3) (2)
Ending Balance 1,051 1,333 1,051 1,333
Attributable to Parent [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 1,006 1,322 1,080 1,309
Total comprehensive income (loss) $ 66 (22) $ 128 114
Preferred stock dividends (2) (7)
Common stock dividends $ (9) (7) $ (27) (23)
Share conversion     3
Common stock share repurchases (119) (68) $ (245) (181)
Stock compensation 7 $ 6 17 16
Stock withheld for employee taxes (1) (3) (2)
Ending Balance 950 $ 1,229 950 1,229
Attributable to Non-Controlling Interests [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 103 104 100 104
Total comprehensive income (loss) 0 1 14 8
Distributions to noncontrolling interests (2) (1) (8) (8)
Derecognition of noncontrolling interests     (5)  
Ending Balance $ 101 $ 104 $ 101 $ 104