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SENIOR NOTES PAYABLE (Details) - Senior Notes - USD ($) $ in Millions	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	May 31, 2017	Jul. 31, 2016	Mar. 31, 2012
Debt Instrument [Line Items]
Senior notes payable	$ 2,050		$ 1,550
Unaccreted premium/(discount)	9		11
Unamortized debt issuance costs	(15)		(11)
Total senior notes payable	2,044		1,550
Senior Notes Due 2024
Debt Instrument [Line Items]
Senior notes payable	250		250
Stated interest rate						5.625%
Senior Notes Due 2026
Debt Instrument [Line Items]
Senior notes payable	500		500
Stated interest rate					3.625%
Senior Notes Due 2030
Debt Instrument [Line Items]
Senior notes payable	500		0
Stated interest rate		4.65%
Senior Notes Due 2046
Debt Instrument [Line Items]
Senior notes payable	$ 800		$ 800
Stated interest rate				4.95%	4.95%