Derivative Financial Instruments - Unrealized and Realized Gains (Losses) on Derivative Contracts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2019	Aug. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in interest expense on fair value hedge	$ (467)	$ 60	$ (2,445)	$ 1,692
Unrealized and realized gains (losses)	(84,563)	12,238	(297,298)	(166,921)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	(89,864)	13,951	(193,715)	36,053
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	(3,022)	(4,421)	(1,604)	6,207
Equity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	2,236	1,807	(118,354)	(215,232)
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	3,400	281	4,775	3,025
Credit contracts
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	2,687	620	11,600	3,026
Long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in interest expense on fair value hedge	(28,519)	1,221	(72,288)	24,055
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in interest expense on fair value hedge	$ 28,052	$ (1,161)	$ 69,843	$ (22,363)