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Legal Matters - Schedule of Accrued Litigation for Both Covered and Non-Covered Litigation (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | $ 1,203 | $ 1,434 | $ 1,434
Provision for legal matters | 7 | 159 |
Balance at end of period | 1,268 | 914 | 1,203
U.S. Covered Litigation |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 1,198 | 1,428 | 1,428
Balance at end of period | 1,251 | 828 | 1,198
VE Territory Covered Litigation |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 5 | 0 | 0
Provision for legal matters | 7 | 159 |
Balance at end of period | 11 | 61 | $ 5
Interchange Multidistrict Litigation |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Provision for legal matters | 467 | 0 |
Interchange Multidistrict Litigation | U.S. Covered Litigation |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Provision for legal matters | 467 | 0 |
Unsettled |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Provision for legal matters | 7 | 35 |
Settled Litigation |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Payments for legal matters | (416) | (714) |
Settled Litigation | U.S. Covered Litigation |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Payments for legal matters | (414) | (600) |
Settled Litigation | VE Territory Covered Litigation |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Payments for legal matters | $ (1) | $ (98) |

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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=118942415&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=118942415&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=118942415&loc=d3e14326-108349 + Details
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