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Compensation and Benefit Plans (Plan Assets and Benefit Obligation) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term liabilities | $ (869) | $ (943) |
SCE |  |  |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term liabilities | (433) | (483) |
Pension Plans |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 4,179 | 4,284 |
Service cost | 126 | 137 |
Interest cost | 141 | 164 |
Actuarial (gain) loss | (280) | (46) |
Benefits paid | (286) | (360) |
Projected benefit obligation at end of year | 3,880 | 4,179 | $ 4,284
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,616 | 3,388 |
Actual return on plan assets | (86) | 483 |
Employer contributions | 77 | 105 |
Benefits paid | (286) | (360) |
Fair value of plan assets at end of year | 3,321 | 3,616 | 3,388
Funded status at end of year | (559) | (563) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 2 | 7 |
Current liabilities | (29) | (17) |
Long-term liabilities | (532) | (553) |
Amounts recognized in the consolidated balance sheets | (559) | (563) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Prior service cost | (1) | (1) |
Net loss | 83 | 77 |
Total amounts recognized in accumulated other comprehensive loss | (82) | (76) |
Amounts recognized as a regulatory liability | 271 | 271 |
Total not yet recognized as income | 353 | 347 |
Accumulated benefit obligation at end of year | 3,753 | 4,022 |
Pension plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 3,880 | 4,179 |
Accumulated benefit obligation | 3,753 | 4,022 |
Fair value of plan assets | $ 3,321 | $ 3,616 |
Weighted-average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 4.19% | 3.46% |
Rate of compensation increase | 4.10% | 4.10% |
Pension Plans | Edison International |  |  |
Assumed health care cost trend rates: |  |  |
Long-term payable | $ 117 | $ 114 |
Pension Plans | SCE |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 3,702 | 3,791 |
Service cost | 121 | 129 |
Interest cost | 124 | 144 |
Actuarial (gain) loss | (273) | (74) |
Benefits paid | (243) | (288) |
Projected benefit obligation at end of year | 3,431 | 3,702 | 3,791
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,390 | 3,172 |
Actual return on plan assets | (86) | 442 |
Employer contributions | 52 | 64 |
Benefits paid | (232) | (288) |
Fair value of plan assets at end of year | 3,124 | 3,390 | 3,172
Funded status at end of year | (307) | (312) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 0 | 0 |
Current liabilities | (5) | (4) |
Long-term liabilities | (302) | (308) |
Amounts recognized in the consolidated balance sheets | (307) | (312) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Prior service cost | 0 | 0 |
Net loss | 17 | 21 |
Total amounts recognized in accumulated other comprehensive loss | (17) | (21) |
Amounts recognized as a regulatory liability | 271 | 271 |
Total not yet recognized as income | 288 | 292 |
Accumulated benefit obligation at end of year | 3,342 | 3,585 |
Pension plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 3,431 | 3,702 |
Accumulated benefit obligation | 3,342 | 3,585 |
Fair value of plan assets | $ 3,124 | $ 3,390 |
Weighted-average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 4.19% | 3.46% |
Rate of compensation increase | 4.10% | 4.10% |
Assumed health care cost trend rates: |  |  |
Net loss reclassified from other comprehensive loss | $ 21 | $ 19 |
Postretirement Benefits Other Than Pensions |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 2,337 | 2,276 |
Service cost | 37 | 31 | 35
Interest cost | 80 | 86 | 97
Special termination benefits | 0 | 1 |
Actuarial (gain) loss | (382) | 24 |
Plan participants' contributions | 28 | 24 |
Benefits paid | (114) | (105) |
Projected benefit obligation at end of year | 1,986 | 2,337 | 2,276
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 2,330 | 2,102 |
Actual return on plan assets | (123) | 297 |
Employer contributions | 13 | 12 |
Plan participants' contributions | 28 | 24 |
Benefits paid | (115) | (105) |
Fair value of plan assets at end of year | 2,133 | 2,330 | 2,102
Funded status at end of year | 147 | (7) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 159 | 6 |
Current liabilities | (12) | (13) |
Long-term liabilities | 0 | 0 |
Amounts recognized in the consolidated balance sheets | 147 | (7) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Total amounts recognized in accumulated other comprehensive loss | (1) | (4) |
Amounts recognized as a regulatory liability | (185) | (26) |
Total not yet recognized as income | $ (184) | $ (22) |
Weighted-average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 4.35% | 3.70% |
Assumed health care cost trend rates: |  |  |
Rate assumed for following year | 6.75% | 6.75% |
Ultimate rate | 5.00% | 5.00% |
Gain from increase in discount rate | $ (195) |  |
Experience gain | (137) |  |
Postretirement Benefits Other Than Pensions | SCE |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 2,325 | $ 2,266 |
Service cost | 37 | 31 | 34
Interest cost | 80 | 85 | 97
Special termination benefits | 0 | 1 |
Actuarial (gain) loss | (379) | 23 |
Plan participants' contributions | 28 | 24 |
Benefits paid | (114) | (105) |
Projected benefit obligation at end of year | 1,977 | 2,325 | 2,266
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 2,330 | 2,102 |
Actual return on plan assets | (123) | 297 |
Employer contributions | 12 | 12 |
Plan participants' contributions | 28 | 24 |
Benefits paid | (114) | (105) |
Fair value of plan assets at end of year | 2,133 | 2,330 | $ 2,102
Funded status at end of year | 156 | 5 |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 168 | 17 |
Current liabilities | (12) | (12) |
Long-term liabilities | 0 | 0 |
Amounts recognized in the consolidated balance sheets | 156 | 5 |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Total amounts recognized in accumulated other comprehensive loss | 0 | 0 |
Amounts recognized as a regulatory liability | (185) | (26) |
Total not yet recognized as income | $ (185) | $ (26) |
Weighted-average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 4.35% | 3.70% |
Assumed health care cost trend rates: |  |  |
Rate assumed for following year | 6.75% | 6.75% |
Ultimate rate | 5.00% | 5.00% |
Gain from increase in discount rate | $ (194) |  |
Experience gain | $ 135 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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- Definition Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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