GOODWILL AND OTHER INTANGIBLE ASSETS Balances and Changes in Carrying Amounts of Goodwill (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 424	$ 544
Impairment		(105)
Translation	5	(15)
Goodwill, ending balance	429	424
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Cumulative goodwill impairment charges, beginning balance	232
Cumulative goodwill impairment charges, ending balance	232	232
United States [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	192	192
Impairment		0
Translation	0	0
Goodwill, ending balance	192	192
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Cumulative goodwill impairment charges, beginning balance	24
Cumulative goodwill impairment charges, ending balance	24	24
Canada [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	120	130
Impairment		0
Translation	5	(10)
Goodwill, ending balance	125	120
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Cumulative goodwill impairment charges, beginning balance	32
Cumulative goodwill impairment charges, ending balance	32	32
Other Businesses [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	112	222
Impairment		(105)
Translation	0	(5)
Goodwill, ending balance	112	112
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Cumulative goodwill impairment charges, beginning balance	176
Cumulative goodwill impairment charges, ending balance	$ 176	$ 176