Fair Value Measurements (Summary Of Quantitative Information About Level 3 Fair Value Measurements) (Details)	3 Months Ended
	Mar. 31, 2023 Rate
Fair Value Assets Measured on Recurring Basis [Line Items]
Valuation Technique, Discounted cash flow	Discounted cash flow
Private Equity Investments [Member]
Fair Value Assets Measured on Recurring Basis [Line Items]
Valuation Technique, Market comparable companies	Market comparable companies
Private Equity Investments [Member] | Minimum [Member]
Fair Value Assets Measured on Recurring Basis [Line Items]
EBITDA multiple	4.0
Private Equity Investments [Member] | Maximum [Member]
Fair Value Assets Measured on Recurring Basis [Line Items]
EBITDA multiple	6.0
Private Equity Investments [Member] | Weighted Average [Member]
Fair Value Assets Measured on Recurring Basis [Line Items]
EBITDA multiple	5.2	[1]
Mortgage loan commitments
Fair Value Assets Measured on Recurring Basis [Line Items]
Valuation Technique, Discounted cash flow	Discounted cash flow
Mortgage loan commitments | Minimum [Member]
Fair Value Assets Measured on Recurring Basis [Line Items]
Probability of funding	62.60%
Embedded servicing value	0.70%
Mortgage loan commitments | Maximum [Member]
Fair Value Assets Measured on Recurring Basis [Line Items]
Probability of funding	100.00%
Embedded servicing value	1.60%
Mortgage loan commitments | Weighted Average [Member]
Fair Value Assets Measured on Recurring Basis [Line Items]
Probability of funding	78.30%	[1]
Embedded servicing value	1.20%	[1]

[1] * Unobservable inputs were weighted by the relative fair value of the instruments.