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Debt And Related Expenses (Schedule Of Debt Instruments and Balances) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Short-term debt			$ 162
Net discount on debentures and notes		$ (20)	(21)
Debt issuance costs		(35)	(36)
Total debt		4,294	4,454
Total long-term debt		$ 4,294	4,292
6.30% Due January 15, 2019 [Member]
Debt Instrument [Line Items]
Short-term debt			$ 162
Debt, maturity date		Jan. 15, 2019
Debt interest rate, stated percentage		6.30%	6.30%
5.85% due December 15, 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, gross		$ 485	$ 485
Debt, maturity date		Dec. 15, 2025
Debt interest rate, stated percentage		5.85%	5.85%
7.50% due September 15, 2027 [Member]
Debt Instrument [Line Items]
Long-term debt, gross		$ 73	$ 73
Debt, maturity date		Sep. 15, 2027
Debt interest rate, stated percentage		7.50%	7.50%
7.875% due September 30, 2031 [Member]
Debt Instrument [Line Items]
Long-term debt, gross		$ 675	$ 675
Debt, maturity date		Sep. 30, 2031
Debt interest rate, stated percentage		7.875%	7.875%
7.95% due April 15, 2032 [Member]
Debt Instrument [Line Items]
Long-term debt, gross		$ 366	$ 366
Debt, maturity date		Apr. 15, 2032
Debt interest rate, stated percentage		7.95%	7.95%
5.60% due July 15, 2041 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	[1]	$ 1,250	$ 1,250
Debt, maturity date		Jul. 15, 2041
Debt interest rate, stated percentage		5.60%	5.60%
4.75% due May 15, 2042 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	[1]	$ 750	$ 750
Debt, maturity date		May 15, 2042
Debt interest rate, stated percentage		4.75%	4.75%
5.00% due June 15, 2045 [Member]
Debt Instrument [Line Items]
Long-term debt, gross		$ 750	$ 750
Debt, maturity date		Jun. 15, 2045
Debt interest rate, stated percentage		5.00%	5.00%
[1] These senior notes were included in the 2018 tender offer repurchases discussed below

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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

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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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