INCOME TAXES (Provision for (benefit from) income taxes) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal		$ 3	$ (164)	$ (89)
State		10	(17)	(2)
Foreign		1,426	352	160
Total current		1,439	171	69
Deferred income taxes:
Federal		(64)	(137)	(3,403)
State		(10)	(41)	(154)
Foreign		(89)	451	163
Total deferred		(163)	273	(3,394)
Adjustments		(393)	(13)	1,374
Operating loss carryforwards		0	(60)	0
(Provision for) benefit from income taxes		883	371	$ (1,951)
Reversal of valuation allowances due to 2017 Tax Cuts and Jobs Act	$ (975)	272
Decrease in corporate income tax due to Tax Cuts and Jobs Act	$ 121	121
Net provision associated with an increase in the beginning of the year valuation allowance		$ (1,500)	1,200
PT-FI
Deferred income taxes:
Adjustments			$ 200