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Proprietary Capital - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Net effect on earnings | $ 0 | $ 0 |  |
Net unrealized gain (loss) on future cash flow hedges |  | (1) | $ (114) | $ 10
Reclassification to earnings from cash flow hedges |  | 38 | $ 45 | $ 26
Reclassification to earnings from cash flow hedges in the next twelve months |  | $ (27) |  |

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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80845-113994 + Details
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