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Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets: |  |
Nuclear decommissioning trust | $ 1,951 | $ 1,648
Equity Securities |  |
Assets: |  |
Nuclear decommissioning trust | 1,217 | 990
Debt Securities |  |
Assets: |  |
Nuclear decommissioning trust | 734 | 658
Fair Value, Recurring |  |
Assets: |  |
Sub-total | 14 | 13
Liabilities: |  |
Total liabilities | 14 | 13
Fair Value, Recurring | Total |  |
Assets: |  |
Sub-total | 5,594 | 6,430
Total assets | 6,173 | 6,888
Liabilities: |  |
Total liabilities | 6,946 | 8,336
Fair Value, Recurring | Equity Securities |  |
Assets: |  |
Total assets measured at net asset value | 579 | 458
Fair Value, Recurring | Equity Securities | Total |  |
Assets: |  |
Nuclear decommissioning trust | 638 | 532
Fair Value, Recurring | Debt Securities | Total |  |
Assets: |  |
Nuclear decommissioning trust | 734 | 658
Fair Value, Recurring | Commodity contracts |  |
Assets: |  |
Derivative assets | 14 | 13
Liabilities: |  |
Derivative liabilities | 14 | 13
Fair Value, Recurring | Commodity contracts | Total |  |
Assets: |  |
Derivative assets | 4,158 | 5,105
Liabilities: |  |
Derivative liabilities | 6,898 | 8,253
Fair Value, Recurring | Interest rate swaps |  |
Assets: |  |
Derivative assets | 0 | 0
Liabilities: |  |
Derivative liabilities | 0 | 0
Fair Value, Recurring | Interest rate swaps | Total |  |
Assets: |  |
Derivative assets | 64 | 135
Liabilities: |  |
Derivative liabilities | 48 | 83
Level 1 | Fair Value, Recurring |  |
Assets: |  |
Sub-total | 3,524 | 4,044
Liabilities: |  |
Total liabilities | 3,815 | 5,297
Level 1 | Fair Value, Recurring | Equity Securities |  |
Assets: |  |
Nuclear decommissioning trust | 638 | 532
Level 1 | Fair Value, Recurring | Debt Securities |  |
Assets: |  |
Nuclear decommissioning trust | 0 | 0
Level 1 | Fair Value, Recurring | Commodity contracts |  |
Assets: |  |
Derivative assets | 2,886 | 3,512
Liabilities: |  |
Derivative liabilities | 3,815 | 5,297
Level 1 | Fair Value, Recurring | Interest rate swaps |  |
Assets: |  |
Derivative assets | 0 | 0
Liabilities: |  |
Derivative liabilities | 0 | 0
Level 2 | Fair Value, Recurring |  |
Assets: |  |
Sub-total | 1,426 | 1,582
Liabilities: |  |
Total liabilities | 1,443 | 1,016
Level 2 | Fair Value, Recurring | Equity Securities |  |
Assets: |  |
Nuclear decommissioning trust | 0 | 0
Level 2 | Fair Value, Recurring | Debt Securities |  |
Assets: |  |
Nuclear decommissioning trust | 734 | 658
Level 2 | Fair Value, Recurring | Commodity contracts |  |
Assets: |  |
Derivative assets | 628 | 789
Liabilities: |  |
Derivative liabilities | 1,395 | 933
Level 2 | Fair Value, Recurring | Interest rate swaps |  |
Assets: |  |
Derivative assets | 64 | 135
Liabilities: |  |
Derivative liabilities | 48 | 83
Level 3 |  |
Assets: |  |
Sub-total | 630 | 791
Liabilities: |  |
Total liabilities | 1,674 | 2,010
Level 3 | Fair Value, Recurring |  |
Assets: |  |
Sub-total | 630 | 791
Liabilities: |  |
Total liabilities | 1,674 | 2,010
Level 3 | Fair Value, Recurring | Equity Securities |  |
Assets: |  |
Nuclear decommissioning trust | 0 | 0
Level 3 | Fair Value, Recurring | Debt Securities |  |
Assets: |  |
Nuclear decommissioning trust | 0 | 0
Level 3 | Fair Value, Recurring | Commodity contracts |  |
Assets: |  |
Derivative assets | 630 | 791
Liabilities: |  |
Derivative liabilities | 1,674 | 2,010
Level 3 | Fair Value, Recurring | Interest rate swaps |  |
Assets: |  |
Derivative assets | 0 | 0
Liabilities: |  |
Derivative liabilities | $ 0 | $ 0

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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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