Fair Value Disclosures - Analysis of Level 3 Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2022	May 31, 2021	Nov. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 2 to Level 3	$ 51,300	$ 57,800	$ 64,700	$ 99,700
Transfers of assets from Level 3 to Level 2	11,700	21,800	25,000	70,300
Transfers of liabilities from Level 2 to Level 3	98,200	78,100	122,600	162,900
Transfers of liabilities from Level 3 to Level 2	28,000	154,700	44,000	17,300
Net gains (losses) on Level 3 assets (realized and unrealized)	30,400	45,300	51,500	148,400
Net gains (losses) on Level 3 liabilities (realized and unrealized)	159,200	(7,000)	332,300	(60,700)
Excluded assets from unobservable quantitative information	32,900		32,900		$ 40,800
Excluded liabilities from unobservable quantitative information	5,100		5,100		$ 2,200
CDOs and CLOs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 2 to Level 3	20,000	20,100	28,800	18,200
Net gains (losses) on Level 3 assets (realized and unrealized)	877	7,478	254	10,616
Loans and other receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 2 to Level 3	15,100	20,900	9,700	58,300
Transfers of assets from Level 3 to Level 2	3,400			6,700
Net gains (losses) on Level 3 assets (realized and unrealized)	(3,764)	2,814	(9,814)	17,580
Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 2 to Level 3	15,800	13,500	14,000	10,500
Transfers of assets from Level 3 to Level 2		4,400	21,400	6,700
Net gains (losses) on Level 3 assets (realized and unrealized)	(781)	3,575	835	6,373
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 2 to Level 3			6,700
Transfers of assets from Level 3 to Level 2	3,600			17,500
Net gains (losses) on Level 3 assets (realized and unrealized)	3,550	1,292	5,631	2,466
Net gains (losses) on Level 3 liabilities (realized and unrealized)	3,588	22	11	(1,349)
Corporate equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 2 to Level 3			5,600	11,000
Transfers of assets from Level 3 to Level 2	3,100
Net gains (losses) on Level 3 assets (realized and unrealized)	35,581	7,997	36,463	11,299
Net gains (losses) on Level 3 liabilities (realized and unrealized)	234	(42)	3,592	(64)
Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 3 to Level 2		15,300		14,700
Net gains (losses) on Level 3 assets (realized and unrealized)	(47)	205	(111)	33
Net derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of liabilities from Level 2 to Level 3	66,200	50,500	80,800	134,800
Transfers of liabilities from Level 3 to Level 2	20,000	154,200	5,000	17,300
Net gains (losses) on Level 3 liabilities (realized and unrealized)	9,100	8,965	88,018	(16,813)
Structured notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of liabilities from Level 2 to Level 3	23,000	27,400	37,000	27,700
Transfers of liabilities from Level 3 to Level 2	3,300		38,900
Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of liabilities from Level 2 to Level 3	9,100		4,800
Net gains (losses) on Level 3 liabilities (realized and unrealized)	(10)	7	15	(1,441)
Investments at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers of assets from Level 3 to Level 2				24,200
Net gains (losses) on Level 3 assets (realized and unrealized)	1,576	26,775	33,310	103,032
Commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) on Level 3 assets (realized and unrealized)	(439)	201	(463)	158
Net gains (losses) on Level 3 liabilities (realized and unrealized)	$ 0	$ 0	$ 0	$ 0