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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

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