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Compensation and Benefit Plans | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits [Abstract] |
Compensation and Benefit Plans | Note 9.Compensation and Benefit Plans Pension Plans Net periodic pension expense components are: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
(in millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Edison International: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 34 | ​ | $ | 31 | ​ | $ | 102 | ​ | $ | 93
Non-service cost (benefit) | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  |
Interest cost | ​ |  | 26 | ​ |  | 31 | ​ |  | 78 | ​ |  | 92
Expected return on plan assets | ​ |  | (56) | ​ |  | (55) | ​ |  | (168) | ​ |  | (163)
Amortization of prior service cost | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 1
Amortization of net loss1 | ​ |  | 3 | ​ |  | 3 | ​ |  | 9 | ​ |  | 9
Regulatory adjustment | ​ |  | 4 | ​ |  | 2 | ​ |  | 12 | ​ |  | 6
Total non-service benefit2 | ​ | $ | (23) | ​ | $ | (19) | ​ | $ | (69) | ​ | $ | (55)
Total expense recognized | ​ | $ | 11 | ​ | $ | 12 | ​ | $ | 33 | ​ | $ | 38
SCE: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 33 | ​ | $ | 31 | ​ | $ | 99 | ​ | $ | 91
Non-service cost (benefit) | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Interest cost | ​ |  | 24 | ​ |  | 29 | ​ |  | 72 | ​ |  | 85
Expected return on plan assets | ​ |  | (53) | ​ |  | (51) | ​ |  | (159) | ​ |  | (153)
Amortization of prior service cost | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 1
Amortization of net loss1 | ​ |  | 2 | ​ |  | 2 | ​ |  | 6 | ​ |  | 6
Regulatory adjustment | ​ |  | 4 | ​ |  | 2 | ​ |  | 12 | ​ |  | 6
Total non-service benefit2 | ​ | $ | (23) | ​ | $ | (18) | ​ | $ | (69) | ​ | $ | (55)
Total expense recognized | ​ | $ | 10 | ​ | $ | 13 | ​ | $ | 30 | ​ | $ | 36
1 | Represents the amount of net loss reclassified from other comprehensive loss.
2 | Included in "Other income" on Edison International's and SCE's consolidated statement of income.
Postretirement Benefits Other Than Pensions ("PBOP") Net periodic PBOP expense components for Edison International and SCE are:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
(in millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | ​ | $ | 10 | ​ | $ | 10 | ​ | $ | 30 | ​ | $ | 28
Non-service cost (benefit) | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Interest cost | ​ |  | 14 | ​ |  | 17 | ​ |  | 42 | ​ |  | 51
Expected return on plan assets | ​ |  | (27) | ​ |  | (29) | ​ |  | (81) | ​ |  | (89)
Amortization of prior service cost | ​ |  | — | ​ |  | (1) | ​ |  | — | ​ |  | (1)
Amortization of net gain | ​ |  | (8) | ​ |  | (5) | ​ |  | (24) | ​ |  | (13)
Regulatory adjustment | ​ |  | 11 | ​ |  | 8 | ​ |  | 33 | ​ |  | 24
Total non-service benefit1 | ​ | $ | (10) | ​ | $ | (10) | ​ | $ | (30) | ​ | $ | (28)
Total expense | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
1 | Included in "Other income" on Edison International's and SCE's consolidated statement of income.

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