Operating and Reporting Segments (Fair Value Inputs for Commercial Mortgage-Backed Securities) (Details) - CMBS - Financial Services	3 Months Ended
	Feb. 28, 2022
Minimum
Segment Reporting Information [Line Items]
Discount rates at purchase	6.00%
Coupon rates	2.00%
Maximum
Segment Reporting Information [Line Items]
Discount rates at purchase	84.00%
Coupon rates	5.30%