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Compensation and Benefit Plans (Plan Assets and Benefit Obligation) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Change in projected benefit obligation |  |  |
Service cost | $ 169 |  |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term liabilities | (943) | $ (1,354) |
SCE |  |  |
Change in projected benefit obligation |  |  |
Service cost | 164 |  |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term liabilities | (483) | (896) |
Pension Plans |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 4,284 | 4,374 |
Service cost | 137 | 139 |
Interest cost | 164 | 171 |
Actuarial gain | (46) | (125) |
Benefits paid | (360) | (275) |
Projected benefit obligation at end of year | 4,179 | 4,284 | $ 4,374
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,388 | 3,298 |
Actual return on plan assets | 483 | 262 |
Employer contributions | 105 | 103 |
Benefits paid | (360) | (275) |
Fair value of plan assets at end of year | 3,616 | 3,388 | 3,298
Funded status at end of year | (563) | (896) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 7 | 2 |
Current liabilities | (17) | (50) |
Long-term liabilities | (553) | (848) |
Total liabilities | (563) | (896) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Prior service cost | (1) | (1) |
Net loss | (77) | (93) |
Total amounts recognized in accumulated other comprehensive loss | (76) | (92) |
Amounts recognized as a regulatory (liability) asset | 271 | 574 |
Total not yet recognized as (income) expense | 347 | 666 |
Accumulated benefit obligation at end of year | 4,022 | 4,138 |
Pension plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 4,179 | 4,284 |
Accumulated benefit obligation | 4,022 | 4,138 |
Fair value of plan assets | $ 3,616 | $ 3,388 |
Weighted-average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 3.46% | 3.94% |
Rate of compensation increase | 4.10% | 4.00% |
Pension Plans | Edison International |  |  |
Assumed health care cost trend rates: |  |  |
Long-term payable | $ 114 | $ 124 |
Pension Plans | SCE |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 3,791 | 3,878 |
Service cost | 129 | 132 |
Interest cost | 144 | 150 |
Actuarial gain | (74) | (140) |
Benefits paid | (288) | (229) |
Projected benefit obligation at end of year | 3,702 | 3,791 | 3,878
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,172 | 3,080 |
Actual return on plan assets | 442 | 239 |
Employer contributions | 64 | 82 |
Benefits paid | (288) | (229) |
Fair value of plan assets at end of year | 3,390 | 3,172 | 3,080
Funded status at end of year | (312) | (619) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 0 | 0 |
Current liabilities | (4) | (4) |
Long-term liabilities | (308) | (615) |
Total liabilities | (312) | (619) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Prior service cost | 0 | 0 |
Net loss | (21) | (24) |
Total amounts recognized in accumulated other comprehensive loss | (21) | (24) |
Amounts recognized as a regulatory (liability) asset | 271 | 574 |
Total not yet recognized as (income) expense | 292 | 598 |
Accumulated benefit obligation at end of year | 3,585 | 3,683 |
Pension plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 3,702 | 3,791 |
Accumulated benefit obligation | 3,585 | 3,683 |
Fair value of plan assets | $ 3,390 | $ 3,172 |
Weighted-average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 3.46% | 3.94% |
Rate of compensation increase | 4.10% | 4.00% |
Assumed health care cost trend rates: |  |  |
Net loss reclassified from other comprehensive loss | $ 19 | $ 20 |
Postretirement Benefits Other Than Pensions |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | 2,276 | 2,350 |
Service cost | 31 | 35 | 46
Interest cost | 86 | 97 | 102
Special termination benefits | 1 | 2 |
Plan Amendments | 0 | (6) |
Actuarial gain | 24 | (110) |
Plan participants' contributions | 24 | 19 |
Benefits paid | (105) | (111) |
Projected benefit obligation at end of year | 2,337 | 2,276 | 2,350
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 2,102 | 2,036 |
Actual return on plan assets | 297 | 137 |
Employer contributions | 12 | 21 |
Plan participants' contributions | 24 | 19 |
Benefits paid | (105) | (111) |
Fair value of plan assets at end of year | 2,330 | 2,102 | 2,036
Funded status at end of year | (7) | (174) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 6 | 0 |
Current liabilities | (13) | (14) |
Long-term liabilities | 0 | (160) |
Total liabilities | (7) | (174) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Total amounts recognized in accumulated other comprehensive loss | (4) | (4) |
Amounts recognized as a regulatory (liability) asset | (26) | 136 |
Total not yet recognized as (income) expense | $ (22) | $ 140 |
Weighted-average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 3.70% | 4.29% |
Assumed health care cost trend rates: |  |  |
Rate assumed for following year | 6.75% | 7.00% |
Ultimate rate | 5.00% | 5.00% |
Postretirement Benefits Other Than Pensions | SCE |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation at beginning of year | $ 2,266 | $ 2,341 |
Service cost | 31 | 34 | 46
Interest cost | 85 | 97 | 102
Special termination benefits | 1 | 2 |
Plan Amendments | 0 | (6) |
Actuarial gain | 23 | (110) |
Plan participants' contributions | 24 | 19 |
Benefits paid | (105) | (111) |
Projected benefit obligation at end of year | 2,325 | 2,266 | 2,341
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 2,102 | 2,036 |
Actual return on plan assets | 297 | 137 |
Employer contributions | 12 | 21 |
Plan participants' contributions | 24 | 19 |
Benefits paid | (105) | (111) |
Fair value of plan assets at end of year | 2,330 | 2,102 | $ 2,036
Funded status at end of year | 5 | (164) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Long-term assets | 17 | 0 |
Current liabilities | (12) | (13) |
Long-term liabilities | 0 | (151) |
Total liabilities | 5 | (164) |
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) asset | (26) | 136 |
Total not yet recognized as (income) expense | $ (26) | $ 136 |
Weighted-average assumptions used to determine obligations at end of year: |  |  |
Discount rate | 3.70% | 4.29% |
Assumed health care cost trend rates: |  |  |
Rate assumed for following year | 6.75% | 7.00% |
Ultimate rate | 5.00% | 5.00% |

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- Definition Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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