RESTATEMENT OF PREVIOUSLY ISSUED CONSOLIDATED FINANCIAL STATEMENTS - Narratives (Details) - USD ($) $ in Millions	3 Months Ended					6 Months Ended		12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement
Other operating income (expense), net								$ 141	$ 99	$ 56
Selling, general and administrative expenses	$ 641	$ 601	$ 627	$ 676	$ 633	$ 1,242	$ 1,309	2,535	2,620	2,627
Income from continuing operations	313	342	311	341	382	655	723	$ 1,011	1,552	609
Restatement impacts
Error Corrections and Prior Period Adjustments Restatement
Other operating income (expense), net									9	56
Selling, general and administrative expenses	(1)	1	(2)	(5)	11	0	6		3	61
Income from continuing operations	(30)	(5)	(43)	(2)	(7)	$ (35)	(9)		(78)	(115)
Translation of the Financial Position and Results of Operations of our Foreign Operations into U.S. Dollars
Error Corrections and Prior Period Adjustments Restatement
Selling, general and administrative expenses									9	56
Translation of the Financial Position and Results of Operations of our Foreign Operations into U.S. Dollars | Restatement impacts
Error Corrections and Prior Period Adjustments Restatement
Selling, general and administrative expenses	$ (1)	$ 1	$ (2)	$ (7)	$ 4		$ (3)		(6)	5
Foreign Currency Denominated Monetary Assets And Liabilities And Foreign Currency Derivative Contracts | Restatement impacts
Error Corrections and Prior Period Adjustments Restatement
Other operating income (expense), net									$ 59
Income from continuing operations										$ 113