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Medium- And Long-Term Debt (Schedule Of Medium- And Long-Term Debt) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Medium- and long-term debt		$ 7,084	$ 3,024
Parent company
Debt Instrument [Line Items]
Medium- and long-term notes		1,371	1,356
Medium- and long-term debt		1,611	1,593
Subsidiaries
Debt Instrument [Line Items]
Subordinated notes		976	955
Medium- and long-term notes		480	476
Total Federal Home Loan Bank advances:		4,017	0
Medium- and long-term debt		5,473	1,431
3.80% subordinated notes due 2026 | Parent company
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 240	237
Stated interest rate		3.80%
Maturity year		2026
3.70% notes due 2023 | Parent company
Debt Instrument [Line Items]
Medium- and long-term notes	[1]	$ 845	841
Stated interest rate		3.70%
Maturity year		2023
4.00% notes due 2029 | Parent company
Debt Instrument [Line Items]
Medium- and long-term notes	[1]	$ 526	515
Stated interest rate		4.00%
Maturity year		2029
4.00% subordinated notes due 2025 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 334	331
Stated interest rate		4.00%
Maturity year		2025
7.875% subordinated notes due 2026 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 166	165
Stated interest rate		7.875%
Maturity year		2026
5.332 subordinated notes due 2033 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 476	459
Stated interest rate		5.332%
Maturity year		2033
2.50% notes due 2024 | Subsidiaries
Debt Instrument [Line Items]
Medium- and long-term notes	[1]	$ 480	476
Stated interest rate		2.50%
Maturity year		2024
5.07% advance due 2025 | Subsidiaries
Debt Instrument [Line Items]
Total Federal Home Loan Bank advances:	[1]	$ 1,000	0
Stated interest rate		5.07%
Maturity year		2025
4.79% advance due 2026 | Subsidiaries
Debt Instrument [Line Items]
Total Federal Home Loan Bank advances:	[1]	$ 1,003	0
Stated interest rate		4.79%
Maturity year		2026
4.49% advance due 2027 | Subsidiaries
Debt Instrument [Line Items]
Total Federal Home Loan Bank advances:	[1]	$ 1,007	0
Stated interest rate		4.49%
Maturity year		2027
4.49% advance due 2028 | Subsidiaries
Debt Instrument [Line Items]
Total Federal Home Loan Bank advances:	[1]	$ 1,007	$ 0
Stated interest rate		4.49%
Maturity year		2028
[1] The fixed interest rates on these notes have been swapped to a variable rate and designated in a hedging relationship. Accordingly, carrying value has been adjusted to reflect the change in the fair value of the debt as a result of changes in the benchmark rate.

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