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Cash and Equivalents (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Cash and Cash Equivalents [Line Items]        
Cash and equivalents $ 569 $ 883 $ 768 $ 970
Operating cash and equivalents [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 319 430    
Short-term investments [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 198 400    
Cash and equivalents held in joint ventures [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 52 53    
International [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 369 519    
International [Member] | Operating cash and equivalents [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 129 177    
International [Member] | Short-term investments [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 193 293    
International [Member] | Cash and equivalents held in joint ventures [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 47 49    
Domestic [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 200 364    
Domestic [Member] | Operating cash and equivalents [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 190 253    
Domestic [Member] | Short-term investments [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 5 107    
Domestic [Member] | Cash and equivalents held in joint ventures [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents $ 5 $ 4