BASIS OF PRESENTATION (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Cumulative effect of adoption of accounting standards updates									$ 189
Comprehensive income	$ 1,915	$ 1,610			$ 3,745	$ 3,122
Cash and cash equivalents	6,466				6,466			$ 2,624
Restricted cash included in prepaid expenses and other current assets	19				19			21
Total cash, cash equivalents and restricted cash as shown in the Unaudited Consolidated Statements of Cash Flows	6,485	$ 2,994			6,485	2,994		2,645		$ 2,563
Operating lease assets	610				610			$ 0
Total operating lease liabilities	617				617
Current operating lease liabilities	$ 151				$ 151
Retained Earnings
Cumulative effect of adoption of accounting standards updates									430
Previously Reported [Member]
Comprehensive income						2,900
Accounting Standards Update 2016-01 | Retained Earnings
Cumulative effect of adoption of accounting standards updates									$ 241
Accounting Standards Update 2016-01 | Previously Reported [Member]
Correction of presentation error in Statement of Comprehensive Income related to adoption of ASU 2016-01			$ 241	$ 241		$ 241
Accounting Standards Update 2016-02
Operating lease assets							$ 646
Total operating lease liabilities							646
Current operating lease liabilities							$ 152