Derivative Financial Instruments (Remaining Contract Maturity Of Fair Value Of OTC Derivative Assets And Liabilities) (Details) $ in Thousands	Feb. 28, 2019 USD ($)
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	$ 147,917
OTC derivative assets having maturity period of 1 to 5 years	187,828
OTC derivative assets having maturity period of greater than 5 years	120,461
OTC derivative assets cross-maturity netting	(96,207)
Total OTC derivative assets, net of cross-maturity netting	359,999
Cross product counterparty netting	(32,496)
Total OTC derivative assets included in Trading assets	327,503
OTC derivative liabilities having maturity period of 0 to 12 months	136,814
OTC derivative liabilities having maturity period of 1 to 5 years	218,190
OTC derivative liabilities having maturity period of greater than 5 years	220,377
OTC derivative liabilities cross-maturity netting	(96,207)
Total OTC derivative liabilities, net of cross-maturity netting	479,174
Cross product counterparty netting	(32,496)
Total OTC derivative liabilities included in Trading liabilities	446,678
Exchange traded derivative assets and other credit agreements	31,800
Cash collateral received	147,100
Exchange traded derivative liabilities and other credit agreements	150,800
Cash collateral pledged	234,800
Commodity swaps, options and forwards
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	1,332
OTC derivative assets having maturity period of 1 to 5 years	6,078
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	(2,098)
Total OTC derivative assets, net of cross-maturity netting	5,312
OTC derivative liabilities having maturity period of 0 to 12 months	1,832
OTC derivative liabilities having maturity period of 1 to 5 years	954
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	(2,098)
Total OTC derivative liabilities, net of cross-maturity netting	688
Equity swaps and options
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	2,539
OTC derivative assets having maturity period of 1 to 5 years	17,857
OTC derivative assets having maturity period of greater than 5 years	5,240
OTC derivative assets cross-maturity netting	0
Total OTC derivative assets, net of cross-maturity netting	25,636
OTC derivative liabilities having maturity period of 0 to 12 months	30,988
OTC derivative liabilities having maturity period of 1 to 5 years	106,443
OTC derivative liabilities having maturity period of greater than 5 years	37,837
OTC derivative liabilities cross-maturity netting	0
Total OTC derivative liabilities, net of cross-maturity netting	175,268
Credit default swaps
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	111
OTC derivative assets having maturity period of 1 to 5 years	19,824
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	(108)
Total OTC derivative assets, net of cross-maturity netting	19,827
OTC derivative liabilities having maturity period of 0 to 12 months	1,918
OTC derivative liabilities having maturity period of 1 to 5 years	10,878
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	(108)
Total OTC derivative liabilities, net of cross-maturity netting	12,688
Total return swaps
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	47,890
OTC derivative assets having maturity period of 1 to 5 years	18,274
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	(984)
Total OTC derivative assets, net of cross-maturity netting	65,180
OTC derivative liabilities having maturity period of 0 to 12 months	11,553
OTC derivative liabilities having maturity period of 1 to 5 years	14,057
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	(984)
Total OTC derivative liabilities, net of cross-maturity netting	24,626
Foreign currency forwards, swaps and options
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	65,040
OTC derivative assets having maturity period of 1 to 5 years	11,413
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	(16,118)
Total OTC derivative assets, net of cross-maturity netting	60,335
OTC derivative liabilities having maturity period of 0 to 12 months	53,908
OTC derivative liabilities having maturity period of 1 to 5 years	11,042
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	(16,118)
Total OTC derivative liabilities, net of cross-maturity netting	48,832
Fixed income forwards
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	1,645
OTC derivative assets having maturity period of 1 to 5 years	0
OTC derivative assets having maturity period of greater than 5 years	0
OTC derivative assets cross-maturity netting	0
Total OTC derivative assets, net of cross-maturity netting	1,645
OTC derivative liabilities having maturity period of 0 to 12 months	3,810
OTC derivative liabilities having maturity period of 1 to 5 years	0
OTC derivative liabilities having maturity period of greater than 5 years	0
OTC derivative liabilities cross-maturity netting	0
Total OTC derivative liabilities, net of cross-maturity netting	3,810
Interest rate swaps
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
OTC derivative assets having maturity period of 0 to 12 months	29,360
OTC derivative assets having maturity period of 1 to 5 years	114,382
OTC derivative assets having maturity period of greater than 5 years	115,221
OTC derivative assets cross-maturity netting	(76,899)
Total OTC derivative assets, net of cross-maturity netting	182,064
OTC derivative liabilities having maturity period of 0 to 12 months	32,805
OTC derivative liabilities having maturity period of 1 to 5 years	74,816
OTC derivative liabilities having maturity period of greater than 5 years	182,540
OTC derivative liabilities cross-maturity netting	(76,899)
Total OTC derivative liabilities, net of cross-maturity netting	$ 213,262