FINANCIAL INSTRUMENTS (Investments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Proceeds from sales of available-for-sale securities	$ 1,138	$ 1,053	$ 245
Gross realized gains	51	21	5
Gross realized losses	18	30	$ 0
Within one year, Amortized Cost	36
One to five years, Amortized Cost	391
Six to ten years, Amortized Cost	534
After ten years, Amortized Cost	516
Total, Amortized Cost	1,477	1,740
Within one year, Fair Value	39
One to five years, Fair Value	406
Six to ten years, Fair Value	554
After ten years, Fair Value	570
Total, Fair Value	$ 1,569	$ 1,683