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Compensation and Benefit Plans (Plan Assets and Obligation) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term liabilities | $ (415) | $ (422) |
Assumed health care cost trend rates: |  |  |
Other deferred credits and other long-term liabilities | 3,258 | 2,988 |
Pension Plans |  |  |
Pension and Other Postretirement Benefits |  |  |
Expected contributions | 45 | 13 |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 3,524 | 4,171 |
Service cost | 101 | 120 | $ 130
Interest cost | 180 | 111 | 103
Actuarial (gain) loss | 96 | (589) |
Benefits paid | (254) | (289) |
Projected benefit obligation at end of year | 3,647 | 3,524 | 4,171
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,462 | 4,296 |
Actual return on plan assets | 369 | (575) |
Employer contributions | 32 | 30 |
Benefits paid | (254) | (289) |
Fair value of plan assets at end of year | 3,609 | 3,462 | $ 4,296
(Underfunded)/Overfunded status at end of year | (38) | (62) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 169 | 139 |
Current liabilities | (30) | (26) |
Long-term liabilities | (177) | (175) |
Amounts recognized in the consolidated balance sheets | (38) | (62) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net gain | 21 | 17 |
Amounts recognized as a regulatory (liability)/asset | (159) | (139) |
Accumulated benefit obligation at end of year | 3,495 | 3,401 |
Pension plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 3,647 | 3,524 |
Accumulated benefit obligation | 3,495 | 3,401 |
Fair value of plan assets | $ 3,609 | $ 3,462 |
Weighted average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 5.04% | 5.36% | 2.75%
Rate of compensation increase | 4.00% | 4.00% |
Assumed health care cost trend rates: |  |  |
Ultimate rate | 5.86% | 4.50% | 4.50%
Gain (loss) from change in discount rate | $ (96) | $ 1,000 |
Basis points in the discount rate | 0.32 |  |
Gain (loss) from valuation and experience |  | (456) |
Postretirement Benefits Other Than Pensions |  |  |
Pension and Other Postretirement Benefits |  |  |
Expected contributions | $ 0 |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 1,331 | 1,904 |
Service cost | 20 | 34 | $ 40
Interest cost | 67 | 56 | 52
Actuarial (gain) loss | (567) | (598) |
Plan participants' contributions | 28 | 29 |
Benefits paid | (106) | (94) |
Projected benefit obligation at end of year | 773 | 1,331 | 1,904
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 2,187 | 2,772 |
Actual return on plan assets | 162 | (527) |
Employer contributions | 4 | 7 |
Plan participants' contributions | 28 | 29 |
Benefits paid | (106) | (94) |
Fair value of plan assets at end of year | 2,275 | 2,187 | $ 2,772
(Underfunded)/Overfunded status at end of year | 1,502 | 856 |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 1,506 | 871 |
Current liabilities |  | (8) |
Long-term liabilities | (4) | (7) |
Amounts recognized in the consolidated balance sheets | 1,502 | 856 |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net gain | (5) | (2) |
Amounts recognized as a regulatory (liability)/asset | $ (1,505) | $ (867) |
Weighted average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 5.06% | 5.43% | 2.95%
Assumed health care cost trend rates: |  |  |
Rate assumed for following year | 6.50% | 6.75% |
Ultimate rate | 5.00% | 5.00% | 5.00%
Gain (loss) from change in discount rate | $ 553 | $ 546 |
SCE |  |  |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term liabilities | (105) | (105) |
Assumed health care cost trend rates: |  |  |
Other deferred credits and other long-term liabilities | 3,206 | 2,919 |
SCE | Pension Plans |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 3,159 | 3,694 |
Service cost | 99 | 118 | $ 127
Service cost, excluding certain liabilities | 97 | 115 |
Interest cost | 166 | 101 | 95
Interest cost, excluding certain liabilities | 162 | 97 |
Actuarial (gain) loss | 82 | (503) |
Benefits paid | (222) | (244) |
Projected benefit obligation at end of year | 3,278 | 3,159 | 3,694
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,275 | 4,061 |
Actual return on plan assets | 349 | (544) |
Employer contributions | 13 | 2 |
Benefits paid | (222) | (244) |
Fair value of plan assets at end of year | 3,415 | 3,275 | 4,061
(Underfunded)/Overfunded status at end of year | 137 | 116 |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 149 | 128 |
Current liabilities | (2) | (2) |
Long-term liabilities | (10) | (10) |
Amounts recognized in the consolidated balance sheets | 137 | 116 |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net gain | 8 | 8 |
Amounts recognized as a regulatory (liability)/asset | (159) | (139) |
Accumulated benefit obligation at end of year | 3,136 | 3,049 |
Pension plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 3,278 | 3,159 |
Accumulated benefit obligation | 3,136 | 3,049 |
Fair value of plan assets | $ 3,415 | $ 3,275 |
Weighted average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 5.04% | 5.36% |
Rate of compensation increase | 4.00% | 4.00% |
Assumed health care cost trend rates: |  |  |
Gain (loss) from change in discount rate | $ (92) | $ 929 |
Gain (loss) from valuation and experience |  | (430) |
SCE | Pension Plans | Edison International |  |  |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net gain | 8 | 3 |
Assumed health care cost trend rates: |  |  |
Other deferred credits and other long-term liabilities | 94 | 93 |
SCE | Postretirement Benefits Other Than Pensions |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 1,323 | 1,895 |
Service cost | 20 | 34 | 40
Interest cost | 67 | 55 | 52
Actuarial (gain) loss | (563) | (596) |
Plan participants' contributions | 28 | 29 |
Benefits paid | (106) | (94) |
Projected benefit obligation at end of year | 769 | 1,323 | 1,895
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 2,187 | 2,772 |
Actual return on plan assets | 162 | (527) |
Employer contributions | 4 | 7 |
Plan participants' contributions | 28 | 29 |
Benefits paid | (106) | (94) |
Fair value of plan assets at end of year | 2,275 | 2,187 | $ 2,772
(Underfunded)/Overfunded status at end of year | 1,506 | 864 |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 1,506 | 871 |
Current liabilities |  | (7) |
Amounts recognized in the consolidated balance sheets | 1,506 | 864 |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Amounts recognized as a regulatory (liability)/asset | $ (1,505) | $ (867) |
Weighted average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 5.06% | 5.43% |
Assumed health care cost trend rates: |  |  |
Rate assumed for following year | 6.50% | 6.75% |
Ultimate rate | 5.00% | 5.00% |
Gain (loss) from change in discount rate | $ 550 | $ 543 |

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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. + 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 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-3 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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