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Stockholders' Equity (Deficit) (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2015
Sep. 30, 2016
Noncontrolling Interest    
Repurchased shares   4.0
Repurchased shares, total cost   $ 525
Israel    
Noncontrolling Interest    
Noncontrolling interest acquired 49.90%  
Payment to acquired noncontrolling interest $ 151  
Turkey    
Noncontrolling Interest    
Noncontrolling interest acquired 49.90%