SENIOR NOTES PAYABLE (Details) - Senior notes payable - USD ($)	Sep. 30, 2024	Sep. 30, 2023	Apr. 30, 2021	Mar. 31, 2020	May 31, 2017	Jul. 31, 2016
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,050,000,000	$ 2,050,000,000
Net unaccreted premiums	5,000,000	5,000,000
Unamortized debt issuance costs	(15,000,000)	(16,000,000)
Total senior notes payable	2,040,000,000	2,039,000,000
4.65% senior notes, due 2030
Debt Instrument [Line Items]
Long-term debt, gross	500,000,000	500,000,000
Aggregate principal amount of the notes				$ 500,000,000
Interest rate				4.65%
Percentage of principal amount of notes redeemed				100.00%
Basis spread used in determining redemption price				0.50%
4.95% senior notes, due 2046
Debt Instrument [Line Items]
Long-term debt, gross	800,000,000	800,000,000
Aggregate principal amount of the notes						$ 300,000,000
Interest rate						4.95%
Percentage of principal amount of notes redeemed					100.00%
Basis spread used in determining redemption price					0.45%
4.95% senior notes, due 2046
Debt Instrument [Line Items]
Aggregate principal amount of the notes					$ 500,000,000
3.75% senior notes, due 2051
Debt Instrument [Line Items]
Long-term debt, gross	$ 750,000,000	$ 750,000,000
Aggregate principal amount of the notes			$ 750,000,000
Interest rate			3.75%
Percentage of principal amount of notes redeemed			100.00%
Basis spread used in determining redemption price			0.20%