GOODWILL (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Goodwill Disclosure
Number of steps involved in process of impairment test | item	2
Reportable Segments
Goodwill
Goodwill - gross	$ 4,931	$ 4,952	$ 4,946
Accumulated impairments	3,477	3,477	3,477
Net goodwill	1,454	1,475	1,469
Increase (decrease) due to:
Acquisition	208	28
Other	(49)	(49)	6
Goodwill - gross	5,090	4,931	4,952
Accumulated impairments	3,477	3,477	3,477
Net goodwill	1,613	1,454	1,475
Reportable Segments | Commercial
Goodwill
Goodwill - gross	2,401	2,450	2,444
Accumulated impairments	1,266	1,266	1,266
Net goodwill	1,135	1,184	1,178
Increase (decrease) due to:
Acquisition	96	0
Other	(50)	(49)	6
Goodwill - gross	2,447	2,401	2,450
Accumulated impairments	1,266	1,266	1,266
Net goodwill	1,181	1,135	1,184
Reportable Segments | Consumer
Goodwill
Goodwill - gross	2,530	2,502	2,502
Accumulated impairments	2,211	2,211	2,211
Net goodwill	319	291	291
Increase (decrease) due to:
Acquisition	82	28
Other	1	0	0
Goodwill - gross	2,613	2,530	2,502
Accumulated impairments	2,211	2,211	2,211
Net goodwill	402	319	291
Other
Goodwill
Goodwill - gross	0	0	0
Accumulated impairments	0	0	0
Net goodwill	0	0	0
Increase (decrease) due to:
Acquisition	30	0
Other	0	0	0
Goodwill - gross	30	0	0
Accumulated impairments	0	0	0
Net goodwill	$ 30	$ 0	$ 0