Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments.

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The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

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Employee Benefit Plans - Schedule of Investments Measured at Fair Value Using NAV Per Share (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Actuarial (gain) loss	$ (72)	$ (22)	$ 69
Fair value at NAV	327
Unfunded commitments	$ 2
Debt securities \| United States
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Target asset allocations	83.00%
Equity securities \| United States
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Target asset allocations	17.00%
Minimum
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Period in which private equity investments are estimated to be liquidated	1 year
Minimum \| Debt securities
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Target asset allocations	65.00%
Minimum \| Equity securities
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Target asset allocations	15.00%
Maximum
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Period in which private equity investments are estimated to be liquidated	5 years
Maximum \| Debt securities
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Target asset allocations	85.00%
Maximum \| Equity securities
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Target asset allocations	25.00%
Long/short hedge funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value at NAV	$ 2
Unfunded commitments	0
Relative value hedge funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value at NAV	3
Unfunded commitments	0
Event driven hedge funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value at NAV	1
Unfunded commitments	0
Common collective trusts, daily redemption
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value at NAV	299
Unfunded commitments	$ 0
Redemption notice period	3 days
Common collective trusts, monthly redemption
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value at NAV	$ 9
Unfunded commitments	$ 0
Redemption notice period	5 days
Collective trust funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value at NAV	$ 8
Unfunded commitments	0
Private equity
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value at NAV	5
Unfunded commitments	$ 2