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Legal Matters Legal Matters - Accrued Litigation (Details) - USD ($) $ in Millions | 12 Months Ended | 48 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017
Loss Contingency Accrual [Roll Forward] |  |  |
Accrued Litigation, Beginning of Period | $ 981 | $ 1,024 |
Accrued Litigation, End of Period | 982 | 981 | $ 982
Unsettled |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Provision for unsettled legal matters | 19 | 2 |
Settled Litigation |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Payments on unsettled and settled matters | (204) | (47) |
U.S. Covered Litigation |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Accrued Litigation, Beginning of Period | 978 | 1,023 |
Accrued Litigation, End of Period | 978 | 978 | 978
U.S. Covered Litigation | Settled Litigation |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Payments on unsettled and settled matters | 0 | (45) | (528)
VE Territory Covered Litigation |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Accrued Litigation, Beginning of Period | 2 | 0 |
Provision for unsettled legal matters | 186 | 2 |
Accrued Litigation, End of Period | 1 | 2 | $ 1
VE Territory Covered Litigation | Settled Litigation |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Payments on unsettled and settled matters | $ (187) | $ 0 |

X
- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition Amount of cash outflow reducing loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&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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