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Income Taxes - Summary of Gross Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance at October 1 | $ 354 | $ 611 | $ 568
Increase due to acquisitions | 2 | 2 | 1
Increase due to current year tax positions | 40 | 23 | 35
Increase due to prior year tax positions | 60 | 5 | 76
Decreases due to prior year tax positions | 0 | (4) | (49)
Decrease due to settlements with tax authorities | (77) | (183) | (4)
Decrease due to lapse of statute of limitations | (112) | (100) | (16)
Balance at September 30 | 267 | 354 | 611
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 348 | $ 447 | $ 719

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI https://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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