FINANCING ARRANGEMENTS - Senior Unsecured Notes (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 15, 2017	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 21, 2017
Debt Instrument [Line Items]
Redemption price percentage to change in control (as a percent)					101.00%
Repayments of long-term debt					$ 7,839	$ 1,273
Loss on extinguishment of debt			$ 0	$ 0	$ 64	$ 0
Senior Unsecured Notes
Debt Instrument [Line Items]
Redemption price percentage to change in control (as a percent)					101.00%
Repurchased principle amount							$ 1,100
Repayments of long-term debt		$ 1,132			$ 1,100
Loss on extinguishment of debt		$ 36
Senior Unsecured Notes | Forecast | Subsequent Event
Debt Instrument [Line Items]
Repayments of long-term debt	$ 500