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Medium- And Long-Term Debt (Schedule Of Medium- And Long-Term Debt) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Medium- and long-term debt		$ 3,016	$ 2,796
Parent Company
Debt Instrument [Line Items]
Medium- and long-term notes		1,350	1,471
Medium- and long-term debt		1,586	1,736
Subsidiaries
Debt Instrument [Line Items]
Subordinated notes		955	553
Medium- and long-term debt		1,430	1,060
3.80% subordinated notes due 2026 | Parent Company
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 236	265
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]	$ 840	877
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]	$ 510	594
Stated interest rate		4.00%
Maturity year		2029
4.00% subordinated notes due 2025 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 331	363
Stated interest rate		4.00%
Maturity year		2025
7.875% subordinated notes due 2026 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 166	190
Stated interest rate		7.875%
Maturity year		2026
5.332% subordinated notes due 2033 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 458	0
Stated interest rate		5.332%
Maturity year		2033
2.50% notes due 2024 | Subsidiaries
Debt Instrument [Line Items]
Medium- and long-term notes	[1]	$ 475	$ 507
Stated interest rate		2.50%
Maturity year		2024
[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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