FINANCING ARRANGEMENTS - Senior Unsecured Notes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Aug. 15, 2017	Mar. 21, 2017
Debt Instrument [Line Items]
Redemption price percentage to change in control (as a percent)				101.00%
Repayments of long-term debt				$ 9,249	$ 1,917
Loss on extinguishment of debt		$ 1	$ 0	$ 65	$ 0
Senior Unsecured Notes
Debt Instrument [Line Items]
Redemption price percentage to change in control (as a percent)				101.00%
Repurchased principle amount						$ 500	$ 1,100
Repayments of long-term debt	$ 1,132			$ 1,600
Loss on extinguishment of debt	$ 36