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Medium- And Long-Term Debt (Schedule Of Medium- And Long-Term Debt) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Medium- and long-term debt		$ 2,630	$ 2,796
Parent Company
Debt Instrument [Line Items]
Medium- and long-term notes		1,385	1,471
Medium- and long-term debt		1,631	1,736
Subsidiaries
Debt Instrument [Line Items]
Subordinated notes		515	553
Medium- and long-term notes		484	507
Medium- and long-term debt		999	1,060
3.80% subordinated notes due 2026 | Parent Company
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 246	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]	$ 847	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]	$ 538	594
Stated interest rate		4.00%
Maturity year		2029
4.00% subordinated notes due 2025 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 341	363
Stated interest rate		4.00%
Maturity year		2025
7.875% subordinated notes due 2026 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 174	190
Stated interest rate		7.875%
Maturity year		2026
2.50% notes due 2024 | Subsidiaries
Debt Instrument [Line Items]
Medium- and long-term notes	[1]	$ 484	$ 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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