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Goodwill and Other Intangible Assets (Goodwill Roll Forward) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Goodwill $ 3,792 $ 3,792
Accumulated impairment losses (2,733) (2,733)
Net balance 1,059 1,059
Operating Segments [Member] | UNITED STATES    
Goodwill [Roll Forward]    
Goodwill 2,786 2,786
Accumulated impairment losses (2,611) (2,611)
Net balance 175 175
Operating Segments [Member] | ANDES [Member]    
Goodwill [Roll Forward]    
Goodwill 868 868
Accumulated impairment losses 0 0
Net balance 868 868
Operating Segments [Member] | MCAC [Member]    
Goodwill [Roll Forward]    
Goodwill 16 16
Accumulated impairment losses 0 0
Net balance 16 16
Operating Segments [Member] | EURASIA [Member]    
Goodwill [Roll Forward]    
Goodwill 122 122
Accumulated impairment losses (122) (122)
Net balance $ 0 $ 0