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Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 15, 2022	Sep. 08, 2022	May 20, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Total long-term debt	$ 11,345,000				$ 10,127,000
Unamortized discount and debt issuance costs	(119,000)				(95,000)
Less amount due currently	(100,000)				(882,000)
Long-term debt, less amounts due currently (Note 5)	11,126,000				9,150,000
Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	11,245,000				10,127,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Term loan	$ 100,000
4.10% Fixed Senior Notes Due June 1, 2022 [Member]
Debt Instrument [Line Items]
Interest percentage	4.55%
4.10% Fixed Senior Notes Due June 1, 2022 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt					$ 400,000
Interest percentage	4.10%				4.10%
7.00% Fixed Debentures Due September 1, 2022 [Member]
Debt Instrument [Line Items]
Interest percentage	7.00%
7.00% Fixed Debentures Due September 1, 2022 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt					$ 482,000
Interest percentage	7.00%				7.00%
2.75% Senior Notes due June 1, 2024 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 500,000				$ 500,000
Interest percentage	2.75%				2.75%
2.95% Fixed Senior Notes Due April 1, 2025 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 350,000				$ 350,000
Interest percentage	2.95%				2.95%
0.55% Senior Notes Due October 1, 2025 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 450,000				$ 450,000
Interest percentage	0.55%				0.55%
3.86% Senior Notes, Series A, due December 3, 2025 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 174,000				$ 174,000
Interest percentage	3.86%				3.86%
3.86% Senior Notes, Series B, due January 14, 2026 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 38,000				$ 38,000
Interest percentage	3.86%				3.86%
3.70% Fixed Senior Notes Due November 15, 2028 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 650,000				$ 650,000
Interest percentage	3.70%				3.70%
5.75% Fixed Senior Notes Due March 15, 2029 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 318,000				$ 318,000
Interest percentage	5.75%				5.75%
2.75% Senior Notes Due May 15, 2030 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 700,000				$ 700,000
Interest percentage	2.75%				2.75%
7.00% Fixed Senior Notes Due May 1, 2032 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 494,000				$ 494,000
Interest percentage	7.00%				7.00%
4.15% Senior Notes Due June 1, 2032 [Member]
Debt Instrument [Line Items]
Interest percentage	4.15%
4.15% Senior Notes Due June 1, 2032 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 400,000			$ 400,000
Interest percentage	4.15%
4.55% Senior Notes due September 15, 2032 [Member]
Debt Instrument [Line Items]
Secured long-term debt		$ 500,000	$ 700,000
Interest percentage	4.55%
4.55% Senior Notes due September 15, 2032 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 700,000
Interest percentage	4.55%
7.25% Fixed Senior Notes Due January 15, 2033 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 323,000				$ 323,000
Interest percentage	7.25%				7.25%
7.50% Fixed Senior Notes Due September 1, 2038 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 300,000				$ 300,000
Interest percentage	7.50%				7.50%
5.25% Fixed Senior Notes Due September 30, 2040 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 475,000				$ 475,000
Interest percentage	5.25%				5.25%
4.55% Fixed Senior Notes Due December 1, 2041 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 400,000				$ 400,000
Interest percentage	4.55%				4.55%
5.30% Fixed Senior Notes Due June 1, 2042 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 348,000				$ 348,000
Interest percentage	5.30%				5.30%
3.75% Fixed Senior Notes Due April 1, 2045 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 550,000				$ 550,000
Interest percentage	3.75%				3.75%
3.80% Fixed Senior Notes Due September 30, 2047 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 325,000				$ 325,000
Interest percentage	3.80%				3.80%
4.10% Fixed Senior Notes Due November 15, 2048 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 450,000				$ 450,000
Interest percentage	4.10%				4.10%
3.80% Senior Notes, due June 1, 2049 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 500,000				$ 500,000
Interest percentage	3.80%				3.80%
3.10% Senior Notes, due September 15, 2049 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 700,000				$ 700,000
Interest percentage	3.10%				3.10%
3.70% Senior Notes Due May 15, 2050 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 400,000				$ 400,000
Interest percentage	3.70%				3.70%
2.70% Senior Notes Due November 15, 2051 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 500,000				$ 500,000
Interest percentage	2.70%
4.60% Senior Notes due June 1, 2052 [Member]
Debt Instrument [Line Items]
Interest percentage	4.60%
4.60% Senior Notes due June 1, 2052 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 400,000			$ 400,000
Interest percentage	4.60%
4.95% Senior Notes due September 15, 2052
Debt Instrument [Line Items]
Interest percentage	4.95%
4.95% Senior Notes due September 15, 2052 \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 500,000
Interest percentage	4.95%
5.35% Senior Notes Due October 1, 2052 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 300,000				$ 300,000
Interest percentage	5.35%				5.35%
June 2021 Term Loan Credit Agreement Maturing August 15, 2022 [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Term loan	$ 100,000