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Legal Matters - Schedule of Accrued Litigation for Both Covered and Non-Covered Litigation (Detail) - USD ($) $ in Millions | 6 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | $ 983 | $ 914
Balance at end of period | 769 | 886
Uncovered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 1 | 3
Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 150 | 9
Payments for legal matters | (365) | (40)
U.S. Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 881 | 888
Provision for legal matters | 145 | 0
Payments for legal matters | (262) | (7)
Balance at end of period | 764 | 881
VE Territory Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 102 | 21
Provision for legal matters | 5 | 9
Payments for legal matters | (102) | (28)
Balance at end of period | $ 5 | $ 2

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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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- Definition Amount of cash outflow reducing loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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- Definition Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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