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Supplementary Financial Information - Schedule of Asset Retirement Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Beginning balance, liability | $ 2,437 | $ 2,450 | $ 2,436
Additions: |  |  |
Accretion | 88 | 87 | 88
Adjustment for change in estimates (a) | 94 | 49 | 14
Reductions: |  |  |
Payments | (81) | (88) | (88)
Liability transfers |  | (61) |
Ending balance, liability | 2,538 | 2,437 | 2,450
Less amounts due currently | (124) | (128) |
Noncurrent liability at December 31, 2023 | 2,414 | 2,309 |
Asset retirement obligation, non-cash additions, asset retirement costs | 67 | 19 | 19
Nuclear Plant Decommissioning |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Beginning balance, liability | 1,688 | 1,635 | 1,585
Additions: |  |  |
Accretion | 54 | 53 | 50
Adjustment for change in estimates (a) | 0 | 0 | 0
Reductions: |  |  |
Payments | 0 | 0 | 0
Liability transfers |  | 0 |
Ending balance, liability | 1,742 | 1,688 | 1,635
Less amounts due currently | 0 |  |
Noncurrent liability at December 31, 2023 | 1,742 |  |
Land Reclamation, Coal Ash and Other |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Beginning balance, liability | 749 | 815 | 851
Additions: |  |  |
Accretion | 34 | 34 | 38
Adjustment for change in estimates (a) | 94 | 49 | 14
Reductions: |  |  |
Payments | (81) | (88) | (88)
Liability transfers |  | (61) |
Ending balance, liability | 796 | $ 749 | $ 815
Less amounts due currently | (124) |  |
Noncurrent liability at December 31, 2023 | $ 672 |  |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481999/410-20-25-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481879/410-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of asset retirement obligations transferred to third-parties and/or other current and/or noncurrent liability accounts. + References No definition available. + Details
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