BASIS OF PRESENTATION Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Cumulative effect of adoption of accounting standards updates						$ 189
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 912	$ 668
Cash and cash equivalents	2,334			$ 2,624
Restricted cash included in prepaid expenses and other current assets	20			21
Total cash, cash equivalents and restricted cash as shown in the Unaudited Consolidated Statements of Cash Flows	2,354	2,645		2,645		2,563
Operating lease assets	635			0
Total operating lease liabilities	641
Current operating lease liabilities	153
Non-current operating lease liabilities	$ 488			$ 0
Retained Earnings
Cumulative effect of adoption of accounting standards updates						430
Accumulated Other Comprehensive Income (Loss)
Cumulative effect of adoption of accounting standards updates						$ (241)
Previously Reported [Member]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		$ 427
Accounting Standards Update 2016-01 | Retained Earnings
Cumulative effect of adoption of accounting standards updates					$ 241
Accounting Standards Update 2016-02
Operating lease assets			$ 646
Total operating lease liabilities			646
Current operating lease liabilities			$ 152