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Fair Value Measurements Fair Value Measurements - Investments (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024 USD ($) Units	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) Units	Jun. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)
Investment Gains (Losses)
Financing Receivable, after Allowance for Credit Loss	$ 113		$ 113		$ 96
Period of time where the investor contributes capital to an investment in a private partnership - minimum | Units	3		3
Period of time where the investor contributes capital to an investment in a private partnership - maximum | Units	4		4
Minimum investment period | Units	10		10
Number of readily available quoted exchange prices for the investments	0		0
Investment funds	$ 4,693		$ 4,693		$ 4,123
NDT [Member]
Investment Gains (Losses)
Investment funds	3,200		3,200
ART [Member]
Investment Gains (Losses)
Investment funds	1,400		1,400
LTDCP [Member]
Investment Gains (Losses)
Unrealized gains (losses) on investments	0	$ (1)	(2)	$ (2)
SERP
Investment Gains (Losses)
Unrealized gains (losses) on investments	0	(2)	(9)	(9)
ART [Member]
Investment Gains (Losses)
Unrealized gains (losses) on investments	4	(24)	(119)	(145)
Debt and Equity Securities, Unrealized Gain (Loss)	1	7	24	23
NDT [Member]
Investment Gains (Losses)
Unrealized gains (losses) on investments	21	(51)	230	(292)
Debt and Equity Securities, Unrealized Gain (Loss)	7	$ 31	70	$ 79
Real Estate Funds | NDT [Member]
Investment Gains (Losses)
NDT unfunded commitments related to private equity and real estate	108		108
Real Estate Funds | ART [Member]
Investment Gains (Losses)
NDT unfunded commitments related to private equity and real estate	54		54
Private Equity Funds [Member] | NDT [Member]
Investment Gains (Losses)
NDT unfunded commitments related to private equity and real estate	365		365
Private Equity Funds [Member] | ART [Member]
Investment Gains (Losses)
NDT unfunded commitments related to private equity and real estate	139		139
Private Credit [Member] | NDT [Member]
Investment Gains (Losses)
NDT unfunded commitments related to private equity and real estate	93		93
Private Credit [Member] | ART [Member]
Investment Gains (Losses)
NDT unfunded commitments related to private equity and real estate	$ 49		$ 49

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Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services.

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