Goodwill and Other Intangible Assets (Goodwill Roll Forward) (Details) - USD ($) $ in Millions	Dec. 31, 2019		Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill	$ 3,670		$ 3,792
Accumulated impairment losses	(2,611)		(2,733)
Net balance	1,059		1,059
Kilroot [Member]
Goodwill [Roll Forward]
Goodwill	122
Accumulated impairment losses	(122)
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	0	[1]	122
Accumulated impairment losses	0	[1]	(122)
Net balance	$ 0		$ 0

[1] Goodwill and accumulated impairment losses at the Eurasia reportable segment were reduced by $122 million due to the sale of Kilroot in 2019.