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Acquisitions (Details) - USD ($)
$ in Millions
Feb. 18, 2015
Sep. 30, 2015
Business Combinations [Abstract]    
Goodwill, Acquired During Period $ 14  
Business Acquisition, Percentage of Voting Interests Acquired 100.00%  
Business Combination, Consideration Transferred, Other $ 5  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   $ 4
Business Combination, Consideration Transferred 25  
Payments to Acquire Businesses, Gross $ 20