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

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Total carrying amount as of the balance sheet date of unearned revenue or income, not otherwise specified in the taxonomy, which is expected to be taken into income in future periods and obligations not separately disclosed in the balance sheet (other liabilities).

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Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands										1 Months Ended	9 Months Ended
	Sep. 15, 2022	Sep. 09, 2022	Sep. 08, 2022	Sep. 01, 2022	Aug. 29, 2022	Jul. 06, 2022	May 20, 2022	Mar. 01, 2022	Jan. 28, 2022	May 20, 2022	Sep. 30, 2022	Dec. 31, 2021
Long-Term Debt [Line Items]
Repayments of long-term debt											$ 2,732,000
Percentage of principal amount plus accrued and unpaid interest and make-whole premium											100.00%
Number of days after shelf registration filing obligation for filing to be effective											180 days
Increase in annual interest rate											0.50%
Estimated fair value of our long-term debt including current maturities											$ 10,175,000	$ 11,758,000
Carrying amount											$ 11,226,000	10,032,000
Federal Funds Effective Rate [Member]
Long-Term Debt [Line Items]
Spread over variable rate											0.50%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Long-Term Debt [Line Items]
Spread over variable rate											1.00%
Notes 2032 and Notes 2052 [Member]
Long-Term Debt [Line Items]
Repayments of long-term debt											$ 650,000
Proceeds from sale of Notes											$ 1,185,000
Redemption percentage											100.00%
Percentage of principal amount plus accrued and unpaid interest and make-whole premium											100.00%
Number of days after shelf registration filing obligation for filing to be effective											180 days
Increase in annual interest rate											0.50%
Term Loan Credit Agreement1 [Member]
Long-Term Debt [Line Items]
Debt principal amount									$ 400,000
Term Loan Credit Agreement2 [Member]
Long-Term Debt [Line Items]
Debt principal amount									600,000
Term Loan Credit Agreement3 [Member]
Long-Term Debt [Line Items]
Debt principal amount									185,000
Term Loan Credit Agreement4 [Member]
Long-Term Debt [Line Items]
Debt principal amount									115,000
7.00% Fixed Debentures Due September 1, 2022 [Member]
Long-Term Debt [Line Items]
Interest percentage											7.00%
4.15% Senior Notes Due June 1, 2032 [Member]
Long-Term Debt [Line Items]
Interest percentage											4.15%
Proceeds from sale of Notes											$ 395,000
Redemption percentage										4.15%
Spread over variable rate											4.15%
4.60% Senior Notes due June 1, 2052 [Member]
Long-Term Debt [Line Items]
Interest percentage											4.60%
Repayments of long-term debt											$ 255,000
Proceeds from sale of Notes											$ 392,000
Redemption percentage										4.60%
Spread over variable rate											4.60%
Term Loan Credit Agreement Maturing July, 2022 [Member]
Long-Term Debt [Line Items]
Repayments of long-term debt		$ 550,000			$ 482,000
Aggregate principal amount					$ 650,000	$ 650,000					$ 100,000
Spread over variable rate											0.60%
Due date						Aug. 30, 2023
Term Loan Credit Agreement Maturing July, 2022 [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Long-Term Debt [Line Items]
Spread over variable rate											0.10%
4.10% Fixed Senior Notes Due June 1, 2022 [Member]
Long-Term Debt [Line Items]
Interest percentage											4.55%
Debt principal amount									$ 400,000
Spread over variable rate									4.10%
4.55% Senior Notes due September 15, 2032 [Member]
Long-Term Debt [Line Items]
Interest percentage											4.55%
Aggregate principal amount	$ 500,000		$ 700,000
Spread over variable rate	4.95%		4.55%
4.95% Senior Notes due September 15, 2052
Long-Term Debt [Line Items]
Interest percentage											4.95%
Secured Debt [Member]
Long-Term Debt [Line Items]
Aggregate principal amount											$ 11,245,000	$ 10,127,000
Percentage of fair value of cost of property additions certified to the Deed of Trust collateral agent											85.00%
Available bond credits											$ 2,992,000
Future debt subject to property additions to the Deed of Trust											$ 3,715,000
Secured Debt [Member] \| 3.70% Fixed Senior Notes Due November 15, 2028 [Member]
Long-Term Debt [Line Items]
Interest percentage											3.70%	3.70%
Repayments of long-term debt							$ 650,000
Aggregate principal amount											$ 650,000	$ 650,000
Secured Debt [Member] \| 4.10% Fixed Senior Notes Due November 15, 2048 [Member]
Long-Term Debt [Line Items]
Interest percentage											4.10%	4.10%
Aggregate principal amount											$ 450,000	$ 450,000
Secured Debt [Member] \| 5.75% Fixed Senior Notes Due March 15, 2029 [Member]
Long-Term Debt [Line Items]
Interest percentage											5.75%	5.75%
Aggregate principal amount											$ 318,000	$ 318,000
Secured Debt [Member] \| 7.00% Fixed Debentures Due September 1, 2022 [Member]
Long-Term Debt [Line Items]
Interest percentage											7.00%	7.00%
Aggregate principal amount												$ 482,000
Secured Debt [Member] \| 3.86% Senior Notes, Series A, due December 3, 2025 [Member]
Long-Term Debt [Line Items]
Interest percentage											3.86%	3.86%
Aggregate principal amount											$ 174,000	$ 174,000
Secured Debt [Member] \| 3.86% Senior Notes, Series B, due January 14, 2026 [Member]
Long-Term Debt [Line Items]
Interest percentage											3.86%	3.86%
Aggregate principal amount											$ 38,000	$ 38,000
Secured Debt [Member] \| 3.10% Senior Notes, due September 15, 2049 [Member]
Long-Term Debt [Line Items]
Interest percentage											3.10%	3.10%
Aggregate principal amount											$ 700,000	$ 700,000
Secured Debt [Member] \| 2.75% Senior Notes due June 1, 2024 [Member]
Long-Term Debt [Line Items]
Interest percentage											2.75%	2.75%
Aggregate principal amount											$ 500,000	$ 500,000
Secured Debt [Member] \| 3.80% Senior Notes, due June 1, 2049 [Member]
Long-Term Debt [Line Items]
Interest percentage											3.80%	3.80%
Aggregate principal amount											$ 500,000	$ 500,000
Secured Debt [Member] \| 4.15% Senior Notes Due June 1, 2032 [Member]
Long-Term Debt [Line Items]
Interest percentage											4.15%
Aggregate principal amount							400,000			$ 400,000	$ 400,000
Secured Debt [Member] \| 4.60% Senior Notes due June 1, 2052 [Member]
Long-Term Debt [Line Items]
Interest percentage											4.60%
Aggregate principal amount							$ 400,000			$ 400,000	$ 400,000
Secured Debt [Member] \| 4.10% Fixed Senior Notes Due June 1, 2022 [Member]
Long-Term Debt [Line Items]
Interest percentage											4.10%	4.10%
Aggregate principal amount												$ 400,000
Secured Debt [Member] \| 4.55% Senior Notes due September 15, 2032 [Member]
Long-Term Debt [Line Items]
Interest percentage											4.55%
Aggregate principal amount											$ 700,000
Secured Debt [Member] \| 4.95% Senior Notes due September 15, 2052
Long-Term Debt [Line Items]
Interest percentage											4.95%
Aggregate principal amount											$ 500,000
Unsecured Debt [Member]
Long-Term Debt [Line Items]
Term loan											$ 100,000
Unsecured Debt [Member] \| Notes 2022 [Member]
Long-Term Debt [Line Items]
Repayments of long-term debt				$ 482,000
Aggregate principal amount								$ 400,000
Redemption percentage								100.00%
Unsecured Debt [Member] \| Notes 2032 [Member]
Long-Term Debt [Line Items]
Percentage of principal amount plus accrued and unpaid interest and make-whole premium											100.00%
Unsecured Debt [Member] \| January, 2022 Term Loan Credit Agreement Maturing April 29, 2023 [Member]
Long-Term Debt [Line Items]
Term loan									$ 1,300,000