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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value Measurements |
Fair Value by Level within the Fair Value Hierarchy | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2023
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Netting | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | and | ​ | ​ |
(in millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Collateral1 |  | Total
Assets at fair value | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative contracts | ​ | $ | — | ​ | $ | 3 | ​ | $ | 91 | ​ | $ | (3) | ​ | $ | 91
Money market funds and other | ​ |  | 78 | ​ | ​ | 22 | ​ | ​ | — | ​ | ​ | — |  | ​ | 100
Nuclear decommissioning trusts: | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
Stocks2 | ​ |  | 1,658 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — |  | ​ | 1,658
Fixed Income3 | ​ |  | 923 | ​ | ​ | 1,421 | ​ | ​ | — | ​ | ​ | — |  | ​ | 2,344
Short-term investments, primarily cash equivalents | ​ |  | 169 | ​ | ​ | 104 | ​ | ​ | — | ​ | ​ | — |  | ​ | 273
Subtotal of nuclear decommissioning trusts4 | ​ |  | 2,750 | ​ |  | 1,525 | ​ |  | — | ​ |  | — |  | ​ | 4,275
Total assets | ​ |  | 2,828 | ​ |  | 1,550 | ​ |  | 91 | ​ |  | (3) |  | ​ | 4,466
Liabilities at fair value | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  |  | ​ |
Derivative contracts | ​ |  | — | ​ | ​ | 77 | ​ | ​ | — | ​ | ​ | (77) |  | ​ | —
Total liabilities | ​ |  | — | ​ |  | 77 | ​ |  | — | ​ |  | (77) |  | ​ | —
Net assets | ​ | $ | 2,828 | ​ | $ | 1,473 | ​ | $ | 91 | ​ | $ | 74 | ​ | $ | 4,466
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2022
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Netting | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | and | ​ | ​ |
(in millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Collateral1 |  | ​ | Total
Assets at fair value | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative contracts | ​ | $ | — | ​ | $ | 392 | ​ | $ | 67 | ​ | $ | (218) | ​ | $ | 241
Money market funds and other | ​ |  | 647 | ​ |  | 22 | ​ |  | — | ​ |  | — | ​ |  | 669
Nuclear decommissioning trusts: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Stocks2 | ​ |  | 1,610 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 1,610
Fixed Income3 | ​ |  | 941 | ​ |  | 1,281 | ​ |  | — | ​ |  | — | ​ |  | 2,222
Short-term investments, primarily cash equivalents | ​ |  | 137 | ​ |  | 64 | ​ |  | — | ​ |  | — | ​ |  | 201
Subtotal of nuclear decommissioning trusts4 | ​ |  | 2,688 | ​ |  | 1,345 | ​ |  | — | ​ |  | — | ​ |  | 4,033
Total assets | ​ |  | 3,335 | ​ |  | 1,759 | ​ |  | 67 | ​ |  | (218) | ​ |  | 4,943
Liabilities at fair value | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Derivative contracts | ​ |  | — | ​ |  | 116 | ​ |  | 4 | ​ |  | (119) | ​ |  | 1
Total liabilities | ​ |  | — | ​ |  | 116 | ​ |  | 4 | ​ |  | (119) | ​ |  | 1
Net assets | ​ | $ | 3,335 | ​ | $ | 1,643 | ​ | $ | 63 | ​ | $ | (99) | ​ | $ | 4,942
1 | Represents the netting of assets and liabilities under master netting agreements and cash collateral.
2 | Approximately 75% and 74% of SCE's equity investments were in companies located in the United States at December 31, 2023 and 2022, respectively.
3 | Includes corporate bonds, which were diversified by the inclusion of collateralized mortgage obligations and other asset backed securities of $106 million and $49 million at December 31, 2023 and 2022, respectively.
4 | Excludes net payables of $102 million and $85 million at December 31, 2023 and 2022, respectively, which consist of interest and dividend receivables as well as receivables and payables related to SCE's pending securities sales and purchases.
Summary of level 3 fair value changes | The following table sets forth a summary of changes in SCE's fair value of Level 3 net derivative assets and liabilities:
​ | ​ | ​ | ​ | ​ | ​
​ | Years ended December 31,
(in millions) | 2023 | ​ | 2022
Fair value of net assets at beginning of period | $ | 63 | ​ | $ | 44
Sales | ​ | (1) | ​ | ​ | (8)
Settlements |  | (40) | ​ |  | (54)
Total realized/unrealized gains1 |  | 69 | ​ |  | 81
Fair value of net assets at end of period | $ | 91 | ​ | $ | 63
1 | Due to regulatory mechanisms, SCE's realized and unrealized gains and losses are recorded as regulatory assets and liabilities.
There were no material transfers into or out of Level 3 during 2023 and 2022.
Valuation techniques and significant inputs | The following table sets forth the significant unobservable inputs used to determine fair value for Level 3 assets and liabilities:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value | ​ | Significant | ​ | ​ | ​ | Weighted
​ | ​ | (in millions) | ​ | Unobservable | ​ | Range | ​ | Average
​ |  | Assets |  | Liabilities |  | Input |  | (per MWh) |  | (per MWh)
Congestion revenue rights | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ |  | ​ |  | ​
December 31, 2023 | ​ | $ | 91 | ​ | $ | — |  | CAISO CRR auction prices |  | $(6.44) - $16,574.36 | ​ | $ | 2.74
December 31, 2022 | ​ |  | 67 | ​ |  | 4 |  | CAISO CRR auction prices |  | (7.91) - 3,856.67 | ​ | ​ | 1.64
Long-term debt fair value | The carrying value and fair value of Edison International's and SCE's long-term debt (including current portion of long-term debt) are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2023 |  | December 31, 2022
​ | ​ | Carrying | ​ | Fair | ​ | Carrying | ​ | Fair
(in millions) |  | Value1 |  | Value2 |  | Value1 |  | Value2
Edison International | ​ | $ | 33,013 | ​ | $ | 31,315 | ​ | $ | 29,639 | ​ | $ | 26,824
SCE | ​ |  | 28,494 | ​ |  | 26,712 | ​ |  | 26,258 | ​ |  | 23,469
1 Carrying value is net of debt issuance costs. 2 The fair value of long-term debt is classified as Level 2.

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- Definition Tabular disclosure of the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets and liabilities) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets and liabilities) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset and liabilities. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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