INCOME TAXES (Effective Income Tax Rate Reconciliation and Income Tax Contingencies) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of effective income tax rate and amount computed using expected U.S. statutory federal rate
Income tax expense at federal statutory rate		$ 1,015	$ 1,539	$ 950
Adjustment due to:
Foreign rate differential		210	(458)	(378)
Innovation Box Tax benefit		(435)	(397)	(325)
Impairment of goodwill and cost-method investment		0	0	344
Tax Act - Remeasurement of deferred tax balances		(2)	(217)	0
Tax Act - U.S. transition tax and other transition impacts	$ (46)	(46)	1,563	0
Other		95	28	(13)
Income tax expense		837	2,058	578
Unrecognized tax benefits
Unrecognized tax benefit — January 1		32	33	43
Gross increases — tax positions in current period		1	5	2
Gross increases — tax positions in prior periods		19	5	1
Gross decreases — tax positions in prior periods		(3)	(9)	0
Reduction due to lapse in statute of limitations		(2)	(1)	(9)
Reduction due to settlements during the current period		(2)	(1)	(4)
Unrecognized tax benefit — December 31	$ 45	$ 45	$ 32	$ 33
The Netherlands
Operating Loss Carryforwards [Line Items]
Innovation Box Tax rate		7.00%
Statutory rate (as a percent)		25.00%