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SENIOR NOTES PAYABLE - Schedule of Senior Notes (Details) - Senior Notes - USD ($) $ in Millions	Jun. 30, 2021	Apr. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Jul. 31, 2016
Debt Instrument [Line Items]
Senior notes payable	$ 2,050		$ 2,050
Unaccreted premium	5		10
Unamortized debt issuance costs	(18)		(15)
Total senior notes payable	2,037		2,045
Senior Notes Due 2030
Debt Instrument [Line Items]
Stated interest rate				4.65%
Senior notes payable	500		500
Senior Notes Due 2046
Debt Instrument [Line Items]
Stated interest rate					4.95%
Senior notes payable	800		800
Senior Notes Due 2051
Debt Instrument [Line Items]
Stated interest rate		3.75%
Senior notes payable	750		0
Senior Notes Due 2024
Debt Instrument [Line Items]
Stated interest rate		5.625%
Senior notes payable	0		250
Senior Notes Due 2026
Debt Instrument [Line Items]
Stated interest rate					3.625%
Senior notes payable	$ 0		$ 500