Investments - Summary of Selected Financial Information for Berkadia (Details) - USD ($) $ in Thousands	2 Months Ended	12 Months Ended
	Nov. 30, 2018	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2018
Schedule of Equity Method Investments [Line Items]
Total assets		$ 47,751,997	$ 43,516,115
Total liabilities		41,385,865	37,386,368
Net earnings (loss)		874,706	244,385	$ 159,017
Berkadia
Schedule of Equity Method Investments [Line Items]
Total assets		4,294,000	2,809,800
Total liabilities		3,626,300	2,213,200
Total equity		667,700	596,600
Our total equity balance		301,200	268,900
Net earnings (loss)	$ 44,400	$ 153,100	$ 195,900