Variable Interest Entities (Schedule of Consolidated VIEs) (Details) - USD ($) $ in Thousands		May 31, 2020	Nov. 30, 2019
Variable Interest Entity [Line Items]
Assets		$ 50,283,215	$ 49,460,234
Liabilities	[1]	40,774,840	39,706,945
Variable interest entities, primary beneficiary
Variable Interest Entity [Line Items]
Assets		709,200	645,800
Liabilities		2,752,300	3,071,100
Variable interest entities, primary beneficiary | Cash
Variable Interest Entity [Line Items]
VIE assets, eliminated in consolidation		600
Variable interest entities, primary beneficiary | Other liabilities
Variable Interest Entity [Line Items]
VIE liabilities, eliminated in consolidation		15,300	17,900
Variable interest entities, primary beneficiary | Secured Funding Vehicles
Variable Interest Entity [Line Items]
Assets		2,784,700	3,111,600
Liabilities		2,761,900	3,088,700
Variable interest entities, primary beneficiary | Secured Funding Vehicles | Cash
Variable Interest Entity [Line Items]
Assets		0	0
Variable interest entities, primary beneficiary | Secured Funding Vehicles | Financial instruments owned, at fair value
Variable Interest Entity [Line Items]
Assets		0	0
Variable interest entities, primary beneficiary | Secured Funding Vehicles | Securities purchased under agreements to resell
Variable Interest Entity [Line Items]
Assets		2,097,500	2,467,300
Variable interest entities, primary beneficiary | Secured Funding Vehicles | Receivables
Variable Interest Entity [Line Items]
Assets		650,500	605,600
Variable interest entities, primary beneficiary | Secured Funding Vehicles | Other
Variable Interest Entity [Line Items]
Assets		36,700	38,700
Variable interest entities, primary beneficiary | Secured Funding Vehicles | Financial instruments sold, not yet purchased, at fair value
Variable Interest Entity [Line Items]
Liabilities		0	0
Variable interest entities, primary beneficiary | Secured Funding Vehicles | Other secured financings
Variable Interest Entity [Line Items]
Liabilities		2,745,200	3,068,600
Variable interest entities, primary beneficiary | Secured Funding Vehicles | Other liabilities
Variable Interest Entity [Line Items]
Liabilities		16,700	20,100
Variable interest entities, primary beneficiary | Other
Variable Interest Entity [Line Items]
Assets		22,600	1,500
Liabilities		5,700	200
Variable interest entities, primary beneficiary | Other | Cash
Variable Interest Entity [Line Items]
Assets		1,200	1,200
Variable interest entities, primary beneficiary | Other | Financial instruments owned, at fair value
Variable Interest Entity [Line Items]
Assets		3,400	300
Variable interest entities, primary beneficiary | Other | Securities purchased under agreements to resell
Variable Interest Entity [Line Items]
Assets		0	0
Variable interest entities, primary beneficiary | Other | Receivables
Variable Interest Entity [Line Items]
Assets		17,800	0
Variable interest entities, primary beneficiary | Other | Other
Variable Interest Entity [Line Items]
Assets		200	0
Variable interest entities, primary beneficiary | Other | Financial instruments sold, not yet purchased, at fair value
Variable Interest Entity [Line Items]
Liabilities		5,300	0
Variable interest entities, primary beneficiary | Other | Other secured financings
Variable Interest Entity [Line Items]
Liabilities		0	0
Variable interest entities, primary beneficiary | Other | Other liabilities
Variable Interest Entity [Line Items]
Liabilities		$ 400	$ 200

[1] Total assets include assets related to variable interest entities of $709.2 million and $645.8 million at May 31, 2020 and November 30, 2019, respectively, and Total liabilities include liabilities related to variable interest entities of $2,752.3 million and $3,071.1 million at May 31, 2020 and November 30, 2019, respectively. See Note 7 for additional information related to variable interest entities.