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Legal Matters Legal Matters - Accrued Litigation (Details) $ in Millions | 1 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Dec. 31, 2010 financial_institution | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($)
Loss Contingency Accrual [Roll Forward] |  |  |  |
Accrued Litigation, Beginning of Period |  | $ 1,024 | $ 1,456 |
Accrued Litigation, End of Period |  | 981 | 1,024 | $ 981
Unsettled |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |
Provision for unsettled legal matters |  | 2 | 14 |
Settled Litigation |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |
Payments on unsettled and settled matters |  | (47) | (446) |
U.S. Covered Litigation |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |
Accrued Litigation, Beginning of Period |  | 1,023 | 1,449 |
Accrued Litigation, End of Period |  | 978 | 1,023 | 978
U.S. Covered Litigation | Settled Litigation |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |
Payments on unsettled and settled matters |  | (45) | (426) |
Covered Litigation | Settled Litigation |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |
Payments on unsettled and settled matters |  |  |  | (528)
U.S. Covered Litigation |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |
Accrued Litigation, Beginning of Period |  | 0 |  |
Provision for unsettled legal matters |  | 2 |  |
Accrued Litigation, End of Period |  | $ 2 | $ 0 | $ 2
Canadian Competition Proceedings |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of Financial Institutions | financial_institution | 10 |  |  |

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- 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=25496072&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=25496072&loc=d3e14326-108349 + Details
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