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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Tax Credit Carryforward [Line Items] |  |
Effective income tax rate reconciliation, percent (in percent) | 19.00% | 16.00%
Recognized tax benefit |  | $ 142
Increase in unrecognized tax benefits, gross | $ 113 |
Increase in unrecognized tax benefits, net | 29 |
Minimum |  |
Tax Credit Carryforward [Line Items] |  |
Decrease in unrecognized tax benefits is reasonably possible | $ 400 |

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- Definition 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 + Details
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