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Acquisition of Business (Details) - USD ($)
$ in Millions
May 12, 2016
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill from the acquisition   $ 1,900 $ 1,900
Corporate [Member]      
Business Acquisition [Line Items]      
Goodwill from the acquisition   $ 490 $ 490
Cruise [Member]      
Business Acquisition [Line Items]      
Consideration for acquisition $ 581    
Cash paid for acquisition 291    
Cruise [Member] | Corporate [Member]      
Business Acquisition [Line Items]      
Intangible assets acquired 130    
Deferred tax liabilities acquired 39    
Goodwill from the acquisition 490    
Cruise [Member] | Common Stock [Member]      
Business Acquisition [Line Items]      
Common stock issued for acquisition $ 290