Debt And Related Expenses (Schedule Of Debt Instruments and Balances) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Net premium (discount) on debentures and notes	$ 92	$ 103
Debt issuance costs	(33)	(26)
Total debt	6,422	6,440
Less amount classified as short-term debt	247	251
Long-term debt	6,175	6,189
8.25% due August 1, 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 242	$ 242
Charge on early retirement of debt, cash retirement costs	8.25%	8.25%
Debt, maturity date	Aug. 01, 2023
5.25% due September 15, 2024 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 472	$ 472
Charge on early retirement of debt, cash retirement costs	5.25%	5.25%
Debt, maturity date	Sep. 15, 2024
5.85% due December 15, 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 485	$ 485
Charge on early retirement of debt, cash retirement costs	5.85%	5.85%
Debt, maturity date	Dec. 15, 2025
7.50% due September 15, 2027 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 73	$ 73
Charge on early retirement of debt, cash retirement costs	7.50%	7.50%
Debt, maturity date	Sep. 15, 2027
5.25% due October 15, 2027 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 390	$ 390
Charge on early retirement of debt, cash retirement costs	5.25%	5.25%
Debt, maturity date	Oct. 15, 2027
5.875% due June 15, 2028 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 325	$ 325
Charge on early retirement of debt, cash retirement costs	5.875%	5.875%
Debt, maturity date	Jun. 15, 2028
4.50% due January 15, 2030 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 585	$ 585
Charge on early retirement of debt, cash retirement costs	4.50%	4.50%
Debt, maturity date	Jan. 15, 2030
7.875% due September 30, 2031 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 675	$ 675
Charge on early retirement of debt, cash retirement costs	7.875%	7.875%
Debt, maturity date	Sep. 30, 2031
7.95% due April 15, 2032 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 366	$ 366
Charge on early retirement of debt, cash retirement costs	7.95%	7.95%
Debt, maturity date	Apr. 15, 2032
5.60% due July 15, 2041 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,250	$ 1,250
Charge on early retirement of debt, cash retirement costs	5.60%	5.60%
Debt, maturity date	Jul. 15, 2041
4.75% due May 15, 2042 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 750	$ 750
Charge on early retirement of debt, cash retirement costs	4.75%	4.75%
Debt, maturity date	May 15, 2042
5.00% due June 15, 2045 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 750	$ 750
Charge on early retirement of debt, cash retirement costs	5.00%	5.00%
Debt, maturity date	Jun. 15, 2045

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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