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Goodwill and Other Intangible Assets (Goodwill Roll Forward) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]      
Goodwill $ 3,814 $ 3,912  
Accumulated impairment losses (2,755) (2,755)  
Net balance 1,059 1,157  
Goodwill impairment expense 0 0 $ (317)
Goodwill, Transfers (98)    
US      
Goodwill [Roll Forward]      
Goodwill 2,674 2,674  
Accumulated impairment losses (2,633) (2,633)  
Net balance 41 41  
Goodwill, Transfers 0    
Andes      
Goodwill [Roll Forward]      
Goodwill 869 899  
Accumulated impairment losses 0 0  
Net balance 869 899  
Goodwill, Transfers (30)    
MCAC      
Goodwill [Roll Forward]      
Goodwill 149 149  
Accumulated impairment losses 0 0  
Net balance 149 149  
Goodwill, Acquired During Period 0    
Eurasia      
Goodwill [Roll Forward]      
Goodwill 122 190  
Accumulated impairment losses (122) (122)  
Net balance 0 $ 68  
Goodwill, Transfers $ (68)