Fair Value Disclosures (Summary of Gains (Losses) Due to Changes in Instrument Specific Credit Risk on Loans, Other Receivables and Debt Instruments Measured at Fair Value Under Fair Value Option) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2020	May 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans and other receivables	$ (13,926)	$ (2,352)	$ (10,830)	$ (3,072)
Loans	127	0	127	0
Loan commitments	1,750	(757)	1,089	(678)
Changes in instrument specific credit risk	1,302	(199)	1,554	(493)
Long-term debt
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in instrument specific credit risk	197,737	4,009	227,169	27,492
Other changes in fair value	(30,982)	(36,665)	(68,624)	(47,308)
Short-term borrowings
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in instrument specific credit risk	35	0	91	0
Other changes in fair value	$ (644)	$ 0	$ (881)	$ 0