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Compensation and Benefit Plans (Plan Assets and Benefit Obligation) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term liabilities | $ (563) | $ (674) |
Pension Plans |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 4,139 | 3,880 |
Service cost | 121 | 114 |
Interest cost | 124 | 155 |
Actuarial (gain) loss | 323 | 240 |
Benefits paid | (231) | (250) |
Projected benefit obligation at end of year | 4,476 | 4,139 | $ 3,880
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,755 | 3,321 |
Actual return on plan assets | 584 | 611 |
Employer contributions | 62 | 73 |
Benefits paid | (230) | (250) |
Fair value of plan assets at end of year | 4,171 | 3,755 | $ 3,321
Funded status at end of year | (305) | (384) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Current liabilities | (24) | (19) |
Long-term liabilities | (281) | (365) |
Amounts recognized in the consolidated balance sheets | (305) | (384) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Prior service cost | (1) | (1) |
Net loss | 96 | 95 |
Total amounts recognized in accumulated other comprehensive loss | 95 | 94 |
Amounts recognized as a regulatory asset (liability) | 12 | 87 |
Total not yet recognized as income | 107 | 181 |
Accumulated benefit obligation at end of year | 4,238 | 3,968 |
Pension plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 4,476 | 4,139 |
Accumulated benefit obligation | 4,238 | 3,968 |
Fair value of plan assets | $ 4,171 | $ 3,755 |
Weighted average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 2.38% | 3.11% | 4.19%
Rate of compensation increase | 4.00% | 4.10% |
Gain (loss) from increase in discount rate | $ (339) | $ 401 |
Gains from other economic assumption changes | (117) | (157) |
Pension Plans | Edison International Parent |  |  |
Weighted average assumptions used to determine obligations at end of year: |  |  |
Long-term payable | 139 | 133 |
PBOP |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 2,083 | 1,986 |
Service cost | 38 | 30 | $ 37
Interest cost | 63 | 77 | 80
Actuarial (gain) loss | (46) | 70 |
Plan participants' contributions | 29 | 29 |
Benefits paid | (94) | (109) |
Projected benefit obligation at end of year | 2,073 | 2,083 | 1,986
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 2,465 | 2,133 |
Actual return on plan assets | 309 | 401 |
Employer contributions | 8 | 11 |
Plan participants' contributions | 29 | 29 |
Benefits paid | (94) | (109) |
Fair value of plan assets at end of year | 2,717 | 2,465 | 2,133
Funded status at end of year | 644 | 382 |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 663 | 393 |
Current liabilities | (10) | (11) |
Long-term liabilities | (9) | 0 |
Amounts recognized in the consolidated balance sheets | 644 | 382 |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net loss | 1 | 2 |
Amounts recognized as a regulatory asset (liability) | (671) | (416) |
Total not yet recognized as income | $ (670) | $ (414) |
Weighted average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 2.67% | 3.32% |
Rate assumed for following year | 6.50% | 6.50% |
Ultimate rate | 5.00% | 5.00% |
SCE |  |  |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term liabilities | $ (144) | $ (237) |
SCE | Pension Plans |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 3,662 | 3,431 |
Service cost | 117 | 110 |
Interest cost | 110 | 138 |
Actuarial (gain) loss | 292 | 199 |
Benefits paid | (197) | (216) |
Projected benefit obligation at end of year | 3,984 | 3,662 | 3,431
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,541 | 3,124 |
Actual return on plan assets | 551 | 576 |
Employer contributions | 45 | 57 |
Benefits paid | (197) | (216) |
Fair value of plan assets at end of year | 3,940 | 3,541 | 3,124
Funded status at end of year | (44) | (121) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Current liabilities | (2) | (2) |
Long-term liabilities | (42) | (119) |
Amounts recognized in the consolidated balance sheets | (44) | (121) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Prior service cost | 0 | 0 |
Net loss | 16 | 17 |
Total amounts recognized in accumulated other comprehensive loss | 16 | 17 |
Amounts recognized as a regulatory asset (liability) | 12 | 87 |
Total not yet recognized as income | 28 | 104 |
Accumulated benefit obligation at end of year | 3,776 | 3,529 |
Pension plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 3,984 | 3,662 |
Accumulated benefit obligation | 3,776 | 3,529 |
Fair value of plan assets | $ 3,940 | $ 3,541 |
Weighted average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 2.38% | 3.11% |
Rate of compensation increase | 4.00% | 4.10% |
Net loss reclassified from other comprehensive loss | $ 41 | $ 37 |
Gain (loss) from increase in discount rate | (305) | 373 |
Gains from other economic assumption changes | (124) | (177) |
SCE | PBOP |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 2,074 | 1,977 |
Service cost | 37 | 30 | 37
Interest cost | 63 | 77 | 80
Actuarial (gain) loss | (45) | 70 |
Plan participants' contributions | 29 | 29 |
Benefits paid | (94) | (109) |
Projected benefit obligation at end of year | 2,064 | 2,074 | 1,977
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 2,464 | 2,133 |
Actual return on plan assets | 309 | 401 |
Employer contributions | 8 | 10 |
Plan participants' contributions | 29 | 29 |
Benefits paid | (93) | (109) |
Fair value of plan assets at end of year | 2,717 | 2,464 | $ 2,133
Funded status at end of year | 653 | 390 |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 663 | 402 |
Current liabilities | (10) | (12) |
Long-term liabilities | 0 | 0 |
Amounts recognized in the consolidated balance sheets | 653 | 390 |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net loss | 0 | 0 |
Amounts recognized as a regulatory asset (liability) | (671) | (416) |
Total not yet recognized as income | $ (671) | $ (416) |
Weighted average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 2.67% | 3.32% |
Rate assumed for following year | 6.50% | 6.50% |
Ultimate rate | 5.00% | 5.00% |

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