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Compensation and Benefit Plans - Information on Pension Plan Assets and Benefit Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term liabilities | $ (384) | $ (415) |
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |  |  |
Other deferred credits and other long-term liabilities | 3,566 | 3,258 |
Pension Plan |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 3,647 | 3,524 |
Service cost | 103 | 101 | $ 120
Interest cost | 175 | 180 | 111
Actuarial (gain) loss | (59) | 96 |
Benefits paid | (230) | (254) |
Projected benefit obligation at end of year | 3,636 | 3,647 | 3,524
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,609 | 3,462 |
Actual return on plan assets | 192 | 369 |
Employer contributions | 37 | 32 |
Benefits paid | (230) | (254) |
Fair value of plan assets at end of year | 3,608 | 3,609 | $ 3,462
(Underfunded)/Overfunded status at end of year | (28) | (38) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 166 | 169 |
Current liabilities | (27) | (30) |
Long-term liabilities | (167) | (177) |
Amounts recognized in the consolidated balance sheets | (28) | (38) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net gain (loss) | 8 | 21 |
Amounts recognized as a regulatory liability | (146) | (159) |
Accumulated benefit obligation at end of year | 3,508 | 3,495 |
Pension plans with plan assets in excess of an accumulated benefit obligation: |  |  |
Projected benefit obligation | 3,636 | 3,647 |
Accumulated benefit obligation | 3,508 | 3,495 |
Fair value of plan assets | $ 3,608 | $ 3,609 |
Weighted average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 5.56% | 5.04% |
Rate of compensation increase | 4.00% | 4.00% |
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |  |  |
Ultimate rate | 5.54% | 5.86% | 4.50%
Other Postretirement Benefits Plan |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | $ 773 | $ 1,331 |
Service cost | 14 | 20 | $ 34
Interest cost | 38 | 67 | 56
Change in plan provisions | 23 | 0 |
Actuarial (gain) loss | (34) | (567) |
Plan participants' contributions | 26 | 28 |
Benefits paid | (99) | (106) |
Projected benefit obligation at end of year | 741 | 773 | 1,331
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 2,275 | 2,187 |
Actual return on plan assets | 78 | 162 |
Employer contributions | 1 | 4 |
Plan participants' contributions | 26 | 28 |
Benefits paid | (99) | (106) |
Fair value of plan assets at end of year | 2,281 | 2,275 | $ 2,187
(Underfunded)/Overfunded status at end of year | 1,540 | 1,502 |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 1,544 | 1,506 |
Current liabilities | (1) | 0 |
Long-term liabilities | (3) | (4) |
Amounts recognized in the consolidated balance sheets | 1,540 | 1,502 |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net gain (loss) | (4) | (5) |
Amounts recognized as a regulatory liability | $ (1,544) | $ (1,505) |
Weighted average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 5.60% | 5.06% |
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |  |  |
Rate assumed for following year | 6.25% | 6.50% |
Ultimate rate | 5.00% | 5.00% | 5.00%
SCE |  |  |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term liabilities | $ (92) | $ (105) |
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |  |  |
Other deferred credits and other long-term liabilities | 3,518 | 3,206 |
SCE | Pension Plan |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 3,278 | 3,159 |
Service cost | 101 | 99 | $ 118
Service cost, excluding certain liabilities | 99 | 97 |
Interest cost | 162 | 166 | 101
Interest cost, excluding certain liabilities | 157 | 162 |
Actuarial (gain) loss | (47) | 82 |
Benefits paid | (198) | (222) |
Projected benefit obligation at end of year | 3,289 | 3,278 | 3,159
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,415 | 3,275 |
Actual return on plan assets | 182 | 349 |
Employer contributions | 17 | 13 |
Benefits paid | (198) | (222) |
Fair value of plan assets at end of year | 3,416 | 3,415 | $ 3,275
(Underfunded)/Overfunded status at end of year | 127 | 137 |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 137 | 149 |
Current liabilities | (1) | (2) |
Long-term liabilities | (9) | (10) |
Amounts recognized in the consolidated balance sheets | 127 | 137 |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net gain (loss) | 13 | 8 |
Amounts recognized as a regulatory liability | (133) | (159) |
Accumulated benefit obligation at end of year | 3,172 | 3,136 |
Pension plans with plan assets in excess of an accumulated benefit obligation: |  |  |
Projected benefit obligation | 3,289 | 3,278 |
Accumulated benefit obligation | 3,172 | 3,136 |
Fair value of plan assets | $ 3,416 | $ 3,415 |
Weighted average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 5.56% | 5.04% | 5.36%
Rate of compensation increase | 4.00% | 4.00% |
SCE | Pension Plan | Parent Company |  |  |
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |  |  |
Other deferred credits and other long-term liabilities | $ 88 | $ 94 |
SCE | Other Postretirement Benefits Plan |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 769 | 1,323 |
Service cost | 14 | 20 | $ 34
Interest cost | 38 | 67 | 55
Change in plan provisions | 23 | 0 |
Actuarial (gain) loss | (34) | (563) |
Plan participants' contributions | 26 | 28 |
Benefits paid | (99) | (106) |
Projected benefit obligation at end of year | 737 | 769 | 1,323
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 2,275 | 2,187 |
Actual return on plan assets | 78 | 162 |
Employer contributions | 1 | 4 |
Plan participants' contributions | 26 | 28 |
Benefits paid | (99) | (106) |
Fair value of plan assets at end of year | 2,281 | 2,275 | $ 2,187
(Underfunded)/Overfunded status at end of year | 1,544 | 1,506 |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 1,544 | 1,506 |
Current liabilities | 0 | 0 |
Long-term liabilities | 0 | 0 |
Amounts recognized in the consolidated balance sheets | 1,544 | 1,506 |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net gain (loss) | 0 | 0 |
Amounts recognized as a regulatory liability | $ (1,544) | $ (1,505) |
Weighted average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 5.60% | 5.06% |
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |  |  |
Rate assumed for following year | 6.25% | 6.50% |
Ultimate rate | 5.00% | 5.00% |

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