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Contingencies and Commitments - Narrative (Details) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2021 USD ($) | Nov. 30, 2020 USD ($) | Sep. 22, 2021 classAction lawsuit | May 02, 2019 lawsuit
Loss Contingencies [Line Items] |  |  |  |
Number of lawsuits |  |  |  | 2
Reserve funds | $ | $ 1,400 | $ 400 |  |
Escrow deposit | $ | 167 | 166 |  |
Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of lawsuits, COVID-19 |  |  | 72 |
Number of lawsuits dismissed or settled, COVID-19 |  |  | 38 |
Number of class actions, COVID-19 | classAction |  |  | 10 |
Number of class actions dismissed or settled, COVID-19 |  |  | 5 |
Prepaid expenses and other |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Escrow deposit | $ | $ 137 | $ 136 |  |

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- Definition Loss Contingency, Number of Class Actions, COVID-19 + References No definition available. + Details
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- Definition Loss Contingency, Reserve Funds + References No definition available. + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 440 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6491277&loc=d3e6429-115629 + Details
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