Income Taxes (Details) - USD ($)	3 Months Ended	6 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Effective income tax rate reconciliation, percent (in percent)	15.00%	19.00%	17.00%	18.00%
Recognized tax benefit	$ 184,000,000			$ 142,000,000
Decrease in unrecognized tax benefits, gross	117,000,000		$ 4,000,000
Decrease in unrecognized tax benefits, net	159,000,000		130,000,000
Increase (decrease) interest accrued related to uncertain tax positions	$ 72,000,000	$ 0	$ 51,000,000	$ 0

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-12

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 25
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482620/740-10-25-8

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 25
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482620/740-10-25-10

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Increase (Decrease) In Unrecognized Tax Benefits, Interest On Income Taxes Accrued

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Unrecognized Tax Benefits, Decrease Resulting From Prior Period Tax Positions (Includes Reserve Assessment)

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Unrecognized Tax Benefits, Decrease Resulting From Prior Period Tax Positions, Net

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