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Acquisition of Business (Details) - Cruise [Member] - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2016
May 12, 2016
Business Acquisition [Line Items]    
Effective Date of Acquisition May 12, 2016  
Percentage of Voting Interests Acquired   100.00%
Aggregate Consideration for Acquisitions $ 581  
Gross Cash Paid for Acquisitions 291  
GMNA [Member]    
Business Acquisition [Line Items]    
Intangible Assets Acquired with Indefinite Life   $ 130
Deferred Tax Liabilities Acquired, Net of Other Assets   39
Goodwill Resulting from the Acquisition   $ 490
Common Stock [Member]    
Business Acquisition [Line Items]    
Consideration for Acquisitions, Common Stock Issued $ 290