Variable Interest Entities - Additional Information (Details) - USD ($) $ in Thousands	Aug. 31, 2020	Nov. 30, 2019
Variable Interest Entity [Line Items]
Carrying amount	$ 46,660,448	$ 43,516,115
Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying amount	1,140,400	938,000
Related party private equity vehicles | Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying amount	18,600	23,000
Related party private equity vehicles | JCP Entities
Variable Interest Entity [Line Items]
Equity investments	133,000	133,000
Funded equity commitments	122,000	121,700
Carrying amount of equity investment	18,600	23,000
Other investment vehicles
Variable Interest Entity [Line Items]
Equity investments	772,900	398,600
Funded equity commitments	766,300	390,800
Carrying amount of equity investment	747,100	404,100
Other investment vehicles | Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying amount	747,100	404,100
Agency mortgage-backed securities | Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying amount	1,808,600	1,453,500
Non-agency mortgage and other asset-backed securities | Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying amount	$ 130,800	$ 134,800