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Cash and Equivalents (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Cash and Cash Equivalents [Line Items]        
Cash and equivalents $ 731 $ 970 $ 969 $ 1,106
Cash [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 378 330    
Bank Time Deposits [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 292 560    
Cash Held in Joint Venture [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 61 80    
International [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 435 761    
International [Member] | Cash [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 155 209    
International [Member] | Bank Time Deposits [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 226 481    
International [Member] | Cash Held in Joint Venture [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 54 71    
Domestic [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 296 209    
Domestic [Member] | Cash [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 223 121    
Domestic [Member] | Bank Time Deposits [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 66 79    
Domestic [Member] | Cash Held in Joint Venture [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents $ 7 $ 9