Short-Term and Long-Term Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 300
Total short-term debt	300
Total long-term debt	$ 6,325	$ 6,682
Fixed rate, swap	5.00%
Debt repurchase option, Repayment as percent of principal	100.00%
Senior notes [Member]
Debt Instrument [Line Items]
Senior Long Term Notes	$ 4,568	4,868
Term Loans [Member]
Debt Instrument [Line Items]
Term loans	250	250
Subordinated Debt [Member]
Debt Instrument [Line Items]
Term loans	995
Capital Securities [Member]
Debt Instrument [Line Items]
Capital securities	218	1,213
Long-term Debt [Member]
Debt Instrument [Line Items]
Unamortized premiums (discounts)	(6)	(6)
Unamortized debt issuance costs	(35)	(38)
Unamortized adjustments from discontinued hedges	356	370
Fair value hedge on interest rate swap agreements	(21)	25
Total long-term debt	$ 6,325	6,682
4.20% notes, due 2022 [Member] \| Senior notes [Member]
Debt Instrument [Line Items]
Senior Long Term Notes		300
Interest rate	4.20%
4.00% notes, due 2023 [Member] \| Senior notes [Member]
Debt Instrument [Line Items]
Senior Long Term Notes	$ 500	500
Interest rate	4.00%
3.35% notes, due 2025 [Member] \| Senior notes [Member]
Debt Instrument [Line Items]
Senior Long Term Notes	$ 300	300
Interest rate	3.35%
3.625% notes, due 2026 [Member] \| Senior notes [Member]
Debt Instrument [Line Items]
Senior Long Term Notes	$ 400	400
Interest rate	3.625%
3.80% notes, due 2028 [Member] \| Senior notes [Member]
Debt Instrument [Line Items]
Senior Long Term Notes	$ 500	500
Interest rate	3.80%
3.05% notes, due 2030 [Member] \| Senior notes [Member]
Debt Instrument [Line Items]
Senior Long Term Notes	$ 500	500
Interest rate	3.05%
3.40% notes, due 2031 [Member] \| Senior notes [Member]
Debt Instrument [Line Items]
Senior Long Term Notes	$ 500	500
Interest rate	3.40%
6.15% notes, due 2036 [Member] \| Senior notes [Member]
Debt Instrument [Line Items]
Senior Long Term Notes	$ 243	243
Interest rate	6.15%
6.30% notes, due 2037 [Member] \| Senior notes [Member]
Debt Instrument [Line Items]
Senior Long Term Notes	$ 375	375
Interest rate	6.30%
7.00% notes, due 2040 [Member] \| Senior notes [Member]
Debt Instrument [Line Items]
Senior Long Term Notes	$ 500	500
Interest rate	7.00%
4.35% notes, due 2048 [Member] \| Senior notes [Member]
Debt Instrument [Line Items]
Senior Long Term Notes	$ 450	450
Interest rate	4.35%
4.375% notes, due 2050 [Member] \| Senior notes [Member]
Debt Instrument [Line Items]
Senior Long Term Notes	$ 300	300
Interest rate	4.375%
LIBOR + 87.5 bps loan, due 2024 [Member] \| Term Loans [Member]
Debt Instrument [Line Items]
Term loans	$ 250	250
Variable rate	0.875%
LIBOR +236 bps, due 2066 [Member] \| Subordinated Debt [Member]
Debt Instrument [Line Items]
Term loans	$ 562
Variable rate	2.36%
LIBOR +236 bps, due 2066 [Member] \| Capital Securities [Member]
Debt Instrument [Line Items]
Capital securities	$ 160	722
Variable rate	2.36%
LIBOR +204 bps, due 2067 [Member] \| Subordinated Debt [Member]
Debt Instrument [Line Items]
Term loans	$ 433
Variable rate	2.04%
LIBOR +204 bps, due 2067 [Member] \| Capital Securities [Member]
Debt Instrument [Line Items]
Capital securities	$ 58	$ 491
Variable rate	2.04%

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Contractual interest rate for funds borrowed, under the debt agreement.

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Including the current and noncurrent portions, carrying value at the balance sheet date of a financial instrument used to receive debt funding on a regular basis with original maturities ranging from 5-10 years.

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