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Compensation and Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2024
Pension Plans |
Pension and Other Postretirement Benefits |
Summary of expense components for plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
(in millions) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Edison International: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 24 | ​ | $ | 25 | ​ | $ | 48 | ​ | $ | 50
Non-service cost (benefit) | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  |
Interest cost | ​ |  | 44 | ​ |  | 45 | ​ |  | 88 | ​ |  | 90
Expected return on plan assets | ​ |  | (59) | ​ |  | (54) | ​ |  | (118) | ​ |  | (108)
Amortization of net loss1 | ​ |  | 1 | ​ |  | 1 | ​ |  | 2 | ​ |  | 2
Regulatory adjustment | ​ |  | (5) | ​ |  | (12) | ​ |  | (10) | ​ |  | (24)
Total non-service benefit2 | ​ | $ | (19) | ​ | $ | (20) | ​ | $ | (38) | ​ | $ | (40)
Total expense | ​ | $ | 5 | ​ | $ | 5 | ​ | $ | 10 | ​ | $ | 10
SCE: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 24 | ​ | $ | 24 | ​ | $ | 48 | ​ | $ | 48
Non-service cost (benefit) | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Interest cost | ​ |  | 41 | ​ |  | 42 | ​ |  | 81 | ​ |  | 84
Expected return on plan assets | ​ |  | (55) | ​ |  | (51) | ​ |  | (110) | ​ |  | (102)
Amortization of net loss1 | ​ |  | — | ​ |  | — | ​ |  | 1 | ​ |  | —
Regulatory adjustment | ​ |  | (5) | ​ |  | (12) | ​ |  | (10) | ​ |  | (24)
Total non-service benefit2 | ​ | $ | (19) | ​ | $ | (21) | ​ | $ | (38) | ​ | $ | (42)
Total expense | ​ | $ | 5 | ​ | $ | 3 | ​ | $ | 10 | ​ | $ | 6
1 | Represents the amount of net loss reclassified from other comprehensive loss.
2 | Included in "Other Income, net" on Edison International's and SCE's consolidated statements of income.
Postretirement Benefits Other Than Pensions |
Pension and Other Postretirement Benefits |
Summary of expense components for plans |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
(in millions) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost | ​ | $ | 3 | ​ | $ | 5 | ​ | $ | 6 | ​ | $ | 10
Non-service cost (benefit) | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Interest cost | ​ |  | 9 | ​ |  | 18 | ​ |  | 18 | ​ |  | 36
Expected return on plan assets | ​ |  | (28) | ​ |  | (27) | ​ |  | (56) | ​ |  | (54)
Amortization of net gain | ​ |  | (24) | ​ |  | (12) | ​ |  | (48) | ​ |  | (24)
Regulatory adjustment | ​ |  | 40 | ​ |  | 16 | ​ |  | 80 | ​ |  | 32
Total non-service benefit1 | ​ | $ | (3) | ​ | $ | (5) | ​ | $ | (6) | ​ | $ | (10)
Total expense | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
1 | Included in "Other income, net" on Edison International's and SCE's consolidated statements of income.

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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