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Compensation and Benefit Plans - Net Periodic Pension Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Plan |  |  |
Pension and Other Postretirement Benefits |  |  |
Service cost | $ 103 | $ 101 | $ 120
Non-service cost (benefit) |  |  |
Interest cost | 175 | 180 | 111
Expected return on plan assets | (232) | (214) | (227)
Settlement costs | 0 | 0 | 4
Amortization of prior service cost | 0 | 0 | 0
Amortization of net loss | 4 | 3 | 5
Regulatory adjustment | (23) | (47) | 6
Total non-service benefit | (76) | (78) | (101)
Total expense | 27 | 23 | 19
Other Postretirement Benefits Plan |  |  |
Pension and Other Postretirement Benefits |  |  |
Service cost | 14 | 20 | 34
Non-service cost (benefit) |  |  |
Interest cost | 38 | 67 | 56
Expected return on plan assets | (113) | (107) | (97)
Amortization of prior service cost | (1) | (1) | (2)
Amortization of net loss | (95) | (50) | (45)
Regulatory adjustment | 157 | 71 | 55
Total non-service benefit | (14) | (20) | (33)
Total expense | 0 | 0 | 1
SCE |  |  |
Non-service cost (benefit) |  |  |
Total non-service benefit | (91) | (100) | (136)
SCE | Pension Plan |  |  |
Pension and Other Postretirement Benefits |  |  |
Service cost | 101 | 99 | 118
Non-service cost (benefit) |  |  |
Interest cost | 162 | 166 | 101
Expected return on plan assets | (219) | (202) | (215)
Settlement costs | 0 | 0 | 4
Amortization of prior service cost | 0 | 0 | 0
Amortization of net loss | 2 | 2 | 2
Regulatory adjustment | (22) | (47) | 6
Total non-service benefit | (77) | (81) | (102)
Total expense | 24 | 18 | 16
SCE | Other Postretirement Benefits Plan |  |  |
Pension and Other Postretirement Benefits |  |  |
Service cost | 14 | 20 | 34
Non-service cost (benefit) |  |  |
Interest cost | 38 | 67 | 55
Expected return on plan assets | (113) | (107) | (97)
Amortization of prior service cost | (1) | (1) | (2)
Amortization of net loss | (95) | (50) | (45)
Regulatory adjustment | 157 | 71 | 55
Total non-service benefit | (14) | (20) | (34)
Total expense | $ 0 | $ 0 | $ 0

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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