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Compensation and Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Pension and Other Postretirement Benefits |
Employee Savings Plan Employer Contributions | The following employer contributions were made for continuing operations:
| Edison International |  | SCE
(in millions) | Years ended December 31,
2012 | $ | 85 |  |  | $ | 84 |
2011 | 84 |  |  | 83 |
2010 | 77 |  |  | 76 |
Black-Sholes Option-Pricing Model Assumptions | The Black-Scholes option-pricing model requires various assumptions noted in the following table:
| Years ended December 31,
| 2012 |  | 2011 |  | 2010
Expected terms (in years) | 6.9 |  | 7.0 |  | 7.3
Risk-free interest rate | 1.1% – 1.7% |  | 1.4% – 3.1% |  | 2.0% – 3.2%
Expected dividend yield | 2.8% – 3.1% |  | 3.1% – 3.5% |  | 3.3% – 4.0%
Weighted-average expected dividend yield | 3.0% |  | 3.4% |  | 3.8%
Expected volatility | 17.4% – 18.3% |  | 18.2% – 19.0% |  | 18.8% – 19.8%
Weighted-average volatility | 18.3% |  | 18.9% |  | 19.8%
Summary of Stock Options Activity | The following is a summary of the status of Edison International stock options:
|  |  | Weighted-Average |  |
| Stock options |  | Exercise Price |  | Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (in millions)
Edison International: |  |  |  |  |  |  |
Outstanding at December 31, 2011 | 19,714,214 |  |  | $ | 34.86 |  |  |  |  |  |
Granted | 3,769,948 |  |  | 43.18 |  |  |  |  |  |
Expired | (219,983 | ) |  | 48.21 |  |  |  |  |  |
Forfeited | (223,458 | ) |  | 40.08 |  |  |  |  |  |
Exercised | (3,808,998 | ) |  | 26.35 |  |  |  |  |  |
Outstanding at December 31, 2012 | 19,231,723 |  |  | 37.96 |  |  | 6.11 |  |  |
Vested and expected to vest at December 31, 2012 | 18,958,712 |  |  | 37.99 |  |  | 6.04 |  | $ | 146 |
Exercisable at December 31, 2012 | 10,642,547 |  |  | 38.09 |  |  | 4.57 |  | 88 |
SCE: |  |  |  |  |  |  |
Outstanding at December 31, 2011 | 10,526,540 |  |  | $ | 34.60 |  |  |  |  |  |
Granted | 2,072,892 |  |  | 43.21 |  |  |  |  |  |
Expired | (107,854 | ) |  | 49.06 |  |  |  |  |  |
Forfeited | (176,938 | ) |  | 39.79 |  |  |  |  |  |
Exercised | (2,173,557 | ) |  | 26.90 |  |  |  |  |  |
Affiliate transfers, net | 167,378 |  |  | 35.42 |  |  |  |  |
Outstanding at December 31, 2012 | 10,308,461 |  |  | 37.73 |  |  | 6.14 |  |  |
Vested and expected to vest at December 31, 2012 | 9,952,333 |  |  | 37.74 |  |  | 6.08 |  | $ | 81 |
Exercisable at December 31, 2012 | 5,683,815 |  |  | 37.12 |  |  | 4.51 |  | 48 |
Schedule of Unrecognized Compensation Expense | At December 31, 2012, total unrecognized compensation cost related to stock options and the weighted-average period the cost is expected to be recognized are as follows:
(in millions) | Edison International |  | SCE
Unrecognized compensation cost, net of expected forfeitures | $ | 14 |  |  | $ | 11 |
Weighted-average period (in years) | 2 |  |  | 2 |
At December 31, 2012, total unrecognized compensation cost related to restricted stock units is expected to be recognized as follows:
(in millions) | Edison International |  | SCE
Unrecognized compensation cost, net of expected forfeitures | $ | 6 |  |  | $ | 4 |
Cost to be recognized in 2013 | 4 |  |  | 3 |
Cost to be recognized in 2014 | 2 |  |  | 1 |
At December 31, 2012, total unrecognized compensation cost related to performance shares (based on the December 31, 2012 fair value of performance shares classified as equity awards) and the weighted-average period the cost is expected to be recognized are as follows:
(in millions) | Edison International |  | SCE
Unrecognized compensation cost | $ | 4 |  |  | $ | 2 |
Weighted-average period (in years) | 2 |  |  | 2 |
Performance Shares Fair Value Model Assumptions | The Monte Carlo simulation valuation model requires various assumptions noted in the following table:
| Years ended December 31,
| 2012 |  | 2011 |  | 2010
Equity awards |  |  |  |  |
Grant date risk-free interest rate | 0.4 | % |  | 1.2 | % |  | 1.3 | %
Grant date expected volatility | 13.2 | % |  | 20.4 | % |  | 21.6 | %
Liability awards 1 |  |  |  |  |  |  |  |
Expected volatility | 12.1 | % |  | 15.9 | % |  | 20.6 | %
Risk-free interest rate: |  |  |  |  |  |  |  |
2012 awards | 0.4 | % |  | * |  |  | * |
2011 awards | 0.2 | % |  | 0.3 | % |  | * |
2010 awards | * |  |  | 0.2 | % |  | 0.6 | %
* | Not applicable
1 | The portion of performance shares classified as share-based liability awards are revalued at each reporting period.
Summary of Nonvested Share Activity | The following is a summary of the status of Edison International nonvested performance shares:
| Equity Awards |  | Liability Awards
| Shares |  | Weighted-Average Grant Date Fair Value |  | Shares |  | Weighted-Average Fair Value
Edison International: |  |  |  |  |  |  |
Nonvested at December 31, 2011 1 | 287,693 |  |  | $ | 31.60 |  |  | 287,471 |  |  | $ | 34.26 |
Granted | 95,862 |  |  | 51.43 |  |  | 95,619 |  |  |  |
Forfeited | (6,010 | ) |  | 40.85 |  |  | (5,942 | ) |  |
Vested 2 | (135,124 | ) |  | 32.23 |  |  | (135,077 | ) |  |  |
Nonvested at December 31, 2012 | 242,421 |  |  | 38.86 |  |  | 242,071 |  |  | 46.23 |
SCE: |  |  |  |  |  |  |
Nonvested at December 31, 2011 1 | 160,225 |  |  | $ | 31.62 |  |  | 160,225 |  |  | $ | 34.52 |
Granted | 52,684 |  |  | 51.48 |  |  | 52,512 |  |  |  |
Forfeited | (4,296 | ) |  | 41.76 |  |  | (4,363 | ) |  |
Vested 2 | (79,124 | ) |  | 32.05 |  |  | (79,133 | ) |  |  |
Affiliate transfers, net | 2,451 |  |  | 32.16 |  |  | 2,450 |  |  |
Nonvested at December 31, 2012 | 131,940 |  |  | 38.87 |  |  | 131,691 |  |  | 46.19 |
1 | Excludes performance shares that were paid in 2012 as performance targets were met at December 31, 2011.
2 | Relates to performance shares that expired with zero value as performance targets were not met at December 31, 2012.
Summary of Nonvested Restricted Stock Units Activity | The following is a summary of the status of Edison International nonvested restricted stock units:
| Edison International |  | SCE
| Restricted Stock Units |  | Weighted-Average Grant Date Fair Value |  | Restricted Stock Units |  | Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2011 | 737,635 |  |  | $ | 32.20 |  |  | 411,566 |  |  | $ | 32.14 |
Granted | 227,902 |  |  | 43.17 |  |  | 125,217 |  |  | 43.20 |
Forfeited | (12,139 | ) |  | 39.94 |  |  | (9,071 | ) |  | 40.23 |
Vested | (273,930 | ) |  | 26.37 |  |  | (166,352 | ) |  | 26.85 |
Affiliate transfers, net | — |  |  | — |  |  | 7,193 |  |  | 31.43 |
Nonvested at December 31, 2012 | 679,468 |  |  | $ | 38.09 |  |  | 368,553 |  |  | $ | 38.07 |
Supplemental Data on Stock-Based Compensation | Supplemental Data on Stock-Based Compensation
| Edison International |  | SCE
| Years ended December 31,
(in millions, except per award amounts) | 2012 |  | 2011 |  | 2010 |  | 2012 |  | 2011 |  | 2010
Stock-based compensation expense 1: |  |  |  |  |  |  |  |  |  |  |
Stock options | $ | 18 |  |  | $ | 14 |  |  | $ | 14 |  |  | $ | 10 |  |  | $ | 9 |  |  | $ | 10 |
Performance shares | 7 |  |  | 5 |  |  | 8 |  |  | 4 |  |  | 3 |  |  | 6 |
Restricted stock units | 9 |  |  | 6 |  |  | 6 |  |  | 5 |  |  | 4 |  |  | 5 |
Other | 1 |  |  | 5 |  |  | 7 |  |  | — |  |  | 4 |  |  | 6 |
Total stock-based compensation expense | $ | 35 |  |  | $ | 30 |  |  | $ | 35 |  |  | $ | 19 |  |  | $ | 20 |  |  | $ | 27 |
Income tax benefits related to stock compensation expense | $ | 14 |  |  | $ | 12 |  |  | $ | 13 |  |  | $ | 8 |  |  | $ | 8 |  |  | $ | 11 |
Excess tax benefits (expense)2 | (6 | ) |  | 12 |  |  | 7 |  |  | (13 | ) |  | 11 |  |  | 4 |
Stock options: |  |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value per option granted | $ | 5.22 |  |  | $ | 5.61 |  |  | $ | 4.89 |  |  | $ | 5.22 |  |  | $ | 5.61 |  |  | $ | 4.87 |
Fair value of options vested | 17 |  |  | 18 |  |  | 18 |  |  | 10 |  |  | 10 |  |  | 11 |
Cash used to purchase shares to settle options | 169 |  |  | 90 |  |  | 61 |  |  | 96 |  |  | 46 |  |  | 27 |
Cash from participants to exercise stock options | 101 |  |  | 59 |  |  | 38 |  |  | 59 |  |  | 28 |  |  | 18 |
Value of options exercised | 68 |  |  | 31 |  |  | 23 |  |  | 37 |  |  | 18 |  |  | 9 |
Tax benefits from options exercised | 27 |  |  | 12 |  |  | 9 |  |  | 15 |  |  | 7 |  |  | 4 |
Performance shares classified as equity awards: |  |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value per share granted | $ | 51.43 |  |  | $ | 29.97 |  |  | $ | 32.25 |  |  | $ | 51.48 |  |  | $ | 29.40 |  |  | $ | 32.19 |
Fair value of shares vested | 4 |  |  | 4 |  |  | 4 |  |  | 3 |  |  | 2 |  |  | 3 |
Value of shares settled | 4 |  |  | — |  |  | — |  |  | 2 |  |  | — |  |  | — |
Tax benefits realized from settlement of awards | 2 |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  | — |
Performance shares classified as liability awards: |  |  |  |  |  |  |  |  |  |  |
Value of shares settled | 4 |  |  | — |  |  | — |  |  | 2 |  |  | — |  |  | — |
Tax benefits realized from settlement of awards | 2 |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  | — |
Restricted stock units: |  |  |  |  |  |  |  |  |  |  |
Values of shares settled | $ | 7 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 4 |  |  | $ | 5 |  |  | $ | — |
Tax benefits realized from settlement of awards | 3 |  |  | 3 |  |  | — |  |  | 2 |  |  | 2 |  |  | — |
Weighted average grant date fair value per unit granted | 43.17 |  |  | 38.01 |  |  | 32.12 |  |  | 43.20 |  |  | 38.07 |  |  | 33.38 |
1 | Reflected in "Operations and maintenance" on Edison International's and SCE's consolidated statements of income.
2 | Reflected in "Settlements of stock-based compensation, net" in the financing section of Edison International's and SCE's consolidated statements of cash flows.
Pension Plans |
Pension and Other Postretirement Benefits |
Information on plan assets and benefit obligations | Information on plan assets and benefit obligations for continuing and discontinued operations is shown below:
| Edison International |  | SCE
| Years ended December 31,
(in millions) | 2012 |  | 2011 |  | 2012 |  | 2011
Change in projected benefit obligation |  |  |  |  |  |  |
Projected benefit obligation at beginning of year | $ | 4,493 |  |  | $ | 4,080 |  |  | $ | 4,112 |  |  | $ | 3,732 |
Service cost | 179 |  |  | 165 |  |  | 156 |  |  | 145 |
Interest cost | 196 |  |  | 210 |  |  | 176 |  |  | 192 |
Liability transferred to Edison International | 23 |  |  | — |  |  | (92 | ) |  | — |
Actuarial loss | 370 |  |  | 327 |  |  | 318 |  |  | 311 |
Curtailment | (26 | ) |  | — |  |  | — |  |  | — |
Benefits paid | (253 | ) |  | (289 | ) |  | (236 | ) |  | (268 | )
Deconsolidation of EME 1 | (34 | ) |  | — |  |  | — |  |  | — |
Projected benefit obligation at end of year | $ | 4,948 |  |  | $ | 4,493 |  |  | $ | 4,434 |  |  | $ | 4,112 |
Change in plan assets |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 3,153 |  |  | $ | 3,235 |  |  | $ | 2,971 |  |  | $ | 3,066 |
Actual return on plan assets | 460 |  |  | 61 |  |  | 431 |  |  | 58 |
Employer contributions | 182 |  |  | 146 |  |  | 154 |  |  | 115 |
Benefits paid | (253 | ) |  | (289 | ) |  | (236 | ) |  | (268 | )
Fair value of plan assets at end of year | $ | 3,542 |  |  | $ | 3,153 |  |  | $ | 3,320 |  |  | $ | 2,971 |
Funded status at end of year | $ | (1,406 | ) |  | $ | (1,340 | ) |  | $ | (1,114 | ) |  | $ | (1,141 | )
Amounts recognized in the consolidated balance sheets consist of: |  |  |  |  |  |  |
Current liabilities | $ | (19 | ) |  | $ | (11 | ) |  | $ | (6 | ) |  | $ | (6 | )
Long-term liabilities | (1,387 | ) |  | (1,329 | ) |  | (1,108 | ) |  | (1,135 | )
| $ | (1,406 | ) |  | $ | (1,340 | ) |  | $ | (1,114 | ) |  | $ | (1,141 | )
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |  |  |  |  |
Prior service cost | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |
Net loss | 127 |  |  | 139 |  |  | 40 |  |  | 41 |
| $ | 127 |  |  | $ | 140 |  |  | $ | 40 |  |  | $ | 41 |
Amounts recognized as a regulatory asset: |  |  |  |  |  |  |
Prior service cost | $ | 30 |  |  | $ | 34 |  |  | $ | 30 |  |  | $ | 34 |
Net loss | 999 |  |  | 955 |  |  | 999 |  |  | 955 |
| $ | 1,029 |  |  | $ | 989 |  |  | $ | 1,029 |  |  | $ | 989 |
Total not yet recognized as expense | $ | 1,156 |  |  | $ | 1,129 |  |  | $ | 1,069 |  |  | $ | 1,030 |
Accumulated benefit obligation at end of year | $ | 4,609 |  |  | $ | 4,157 |  |  | $ | 4,171 |  |  | $ | 3,817 |
Pension plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |  |
Projected benefit obligation | $ | 4,948 |  |  | $ | 4,493 |  |  | $ | 4,434 |  |  | $ | 4,112 |
Accumulated benefit obligation | 4,609 |  |  | 4,157 |  |  | 4,171 |  |  | 3,817 |
Fair value of plan assets | 3,542 |  |  | 3,153 |  |  | 3,320 |  |  | 2,971 |
Weighted-average assumptions used to determine obligations at end of year: |  |  |  |  |  |  |
Discount rate | 3.75 | % |  | 4.5 | % |  | 3.75 | % |  | 4.5 | %
Rate of compensation increase | 4.5 | % |  | 4.5 | % |  | 4.5 | % |  | 4.5 | %
1 | The retirement plan liabilities of EME have been deconsolidated as a result of the bankruptcy filing by EME, except for qualified pension plans that Edison International is jointly liable with EME under the Internal Revenue Code. See Note 17 for further information.
Expense Components for Plans | Expense components for continuing operations are:
| Edison International |  | SCE
| Years ended December 31,
(in millions) | 2012 |  | 2011 |  | 2010 |  | 2012 |  | 2011 |  | 2010
Service cost | $ | 163 |  |  | $ | 149 |  |  | $ | 133 |  |  | $ | 160 |  |  | $ | 145 |  |  | $ | 132 |
Interest cost | 183 |  |  | 196 |  |  | 196 |  |  | 180 |  |  | 192 |  |  | 193 |
Expected return on plan assets | (217 | ) |  | (226 | ) |  | (200 | ) |  | (217 | ) |  | (225 | ) |  | (201 | )
Settlement costs | 5 |  |  | — |  |  | — |  |  | 4 |  |  | — |  |  | — |
Amortization of prior service cost | 3 |  |  | 7 |  |  | 8 |  |  | 3 |  |  | 7 |  |  | 8 |
Amortization of net loss | 61 |  |  | 25 |  |  | 20 |  |  | 57 |  |  | 22 |  |  | 17 |
Expense under accounting standards | $ | 198 |  |  | $ | 151 |  |  | $ | 157 |  |  | $ | 187 |  |  | $ | 141 |  |  | $ | 149 |
Regulatory adjustment (deferred) | (19 | ) |  | (28 | ) |  | (52 | ) |  | (19 | ) |  | (28 | ) |  | (52 | )
Total expense recognized | $ | 179 |  |  | $ | 123 |  |  | $ | 105 |  |  | $ | 168 |  |  | $ | 113 |  |  | $ | 97 |
Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income | Other changes in plan assets and benefit obligations recognized in other comprehensive income for continuing operations:
| Edison International |  | SCE
| Years ended December 31,
(in millions) | 2012 |  | 2011 |  | 2010 |  | 2012 |  | 2011 |  | 2010
Net loss | $ | 36 |  |  | $ | 13 |  |  | $ | 18 |  |  | $ | 20 |  |  | $ | 8 |  |  | $ | 15 |
Amortization of prior service cost | — |  |  | — |  |  | (1 | ) |  | — |  |  | — |  |  | — |
Amortization of net loss | (10 | ) |  | (11 | ) |  | (8 | ) |  | (6 | ) |  | (7 | ) |  | (4 | )
Total recognized in other comprehensive loss | $ | 26 |  |  | $ | 2 |  |  | $ | 9 |  |  | $ | 14 |  |  | $ | 1 |  |  | $ | 11 |
Total recognized in expense and other comprehensive income | $ | 205 |  |  | $ | 125 |  |  | $ | 114 |  |  | $ | 182 |  |  | $ | 114 |  |  | $ | 108 |
Schedule of Amounts in Accumulated Other Comprehensive Loss to be Recognized During 2013 | The estimated amounts that will be amortized to expense in 2013 and the net loss expected to be reclassified from accumulated other comprehensive loss for continuing operations are as follows:
(in millions) | Edison International |  | SCE
Unrecognized net loss to be amortized | $ | 61 |  |  | $ | 56 |
Unrecognized prior service cost to be amortized | 3 |  |  | 3 |
Net loss to be reclassified | 13 |  |  | 8 |
Weighted Average Assumptions Utilized to Determine Expense | Edison International and SCE used the following weighted-average assumptions to determine expense for continuing operations:
| Years ended December 31,
| 2012 |  | 2011 |  | 2010
Discount rate | 4.5 | % |  | 5.25 | % |  | 6.0 | %
Rate of compensation increase | 4.5 | % |  | 5.0 | % |  | 5.0 | %
Expected long-term return on plan assets | 7.5 | % |  | 7.5 | % |  | 7.5 | %
Schedule of Expected Future Benefit Payments | The following benefit payments, which reflect expected future service, are expected to be paid:
| Edison International |  | SCE
(in millions) | Years ended December 31,
2013 | $ | 327 |  |  | $ | 295 |
2014 | 322 |  |  | 295 |
2015 | 372 |  |  | 303 |
2016 | 349 |  |  | 310 |
2017 | 350 |  |  | 311 |
2018 – 2022 | 1,736 |  |  | 1,568 |
Schedule of Fair Value of Pension Plan Assets by Hierarchy Levels | The following table sets forth the Master Trust investments for Edison International and SCE that were accounted for at fair value as of December 31, 2012 by asset class and level within the fair value hierarchy:
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Corporate stocks 1 | $ | 743 |  |  | $ | — |  |  | $ | — |  |  | $ | 743 |
Common/collective funds 2 | — |  |  | 635 |  |  | — |  |  | 635 |
U.S. government and agency securities 3 | 242 |  |  | 350 |  |  | — |  |  | 592 |
Partnerships/joint ventures 4 | — |  |  | 166 |  |  | 414 |  |  | 580 |
Corporate bonds 5 | — |  |  | 508 |  |  | — |  |  | 508 |
Other investment entities 6 | — |  |  | 271 |  |  | — |  |  | 271 |
Registered investment companies 7 | 98 |  |  | 28 |  |  | — |  |  | 126 |
Interest-bearing cash | 24 |  |  | — |  |  | — |  |  | 24 |
Other | 1 |  |  | 100 |  |  | — |  |  | 101 |
Total | $ | 1,108 |  |  | $ | 2,058 |  |  | $ | 414 |  |  | $ | 3,580 |
Receivables and payables, net |  |  |  |  |  |  |  |  |  | (38 | )
Net plan assets available for benefits |  |  |  |  |  |  |  |  |  | $ | 3,542 |
SCE's share of net plan assets |  |  |  |  |  |  | $ | 3,320 |
Edison International Parent and Other's share of net plan assets |  |  |  |  |  |  | 7 |
EME's share of net plan assets |  |  |  |  |  |  | 215 |
The following table sets forth the Master Trust investments that were accounted for at fair value as of December 31, 2011 by asset class and level within the fair value hierarchy:
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Corporate stocks 1 | $ | 642 |  |  | $ | — |  |  | $ | — |  |  | $ | 642 |
Common/collective funds 2 | — |  |  | 582 |  |  | — |  |  | 582 |
U.S. government and agency securities 3 | 104 |  |  | 351 |  |  | — |  |  | 455 |
Partnerships/joint ventures 4 | — |  |  | 140 |  |  | 448 |  |  | 588 |
Corporate bonds 5 | — |  |  | 497 |  |  | — |  |  | 497 |
Other investment entities 6 | — |  |  | 247 |  |  | — |  |  | 247 |
Registered investment companies 7 | 79 |  |  | 29 |  |  | — |  |  | 108 |
Interest-bearing cash | 5 |  |  | — |  |  | — |  |  | 5 |
Other | (1 | ) |  | 69 |  |  | — |  |  | 68 |
Total | $ | 829 |  |  | $ | 1,915 |  |  | $ | 448 |  |  | $ | 3,192 |
Receivables and payables, net |  |  |  |  |  |  |  |  |  | (39 | )
Net plan assets available for benefits |  |  |  |  |  |  |  |  |  | $ | 3,153 |
SCE's share of net plan assets |  |  |  |  |  |  | $ | 2,971 |
Edison International Parent and Other's share of net plan assets |  |  |  |  |  |  | 5 |
EME's share of net plan assets |  |  |  |  |  |  | 177 |
1 | Corporate stocks are diversified. For 2012 and 2011, respectively, performance is primarily benchmarked against the Russell Indexes (60% and 60%) and Morgan Stanley Capital International (MSCI) index (40% and 40%).
2 | At December 31, 2012 and 2011, respectively, the common/collective assets were invested in equity index funds that seek to track performance of the Standard and Poor's (S&P 500) Index (29% and 29%), Russell 200 and Russell 1000 indexes (28% and 27%) and the MSCI Europe, Australasia and Far East (EAFE) Index (11% and 10%). A non-index U.S. equity fund representing 25% and 23% of this category for 2012 and 2011, respectively, is actively managed. Another fund representing 6% and 8% of this category for 2012 and 2011, respectively, is a global asset allocation fund.
3 | Level 1 U.S. government and agency securities are U.S. treasury bonds and notes. Level 2 primarily relates to the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation.
4 | Partnerships/joint venture Level 2 investments consist primarily of a partnership which invests in publicly traded fixed income securities, primarily from the banking and finance industry and U.S. government agencies. At December 31, 2012 and 2011, respectively, approximately 56% and 55% of the Level 3 partnerships are invested in (1) asset backed securities, including distressed mortgages and (2) commercial and residential loans and debt and equity of banks. The remaining Level 3 partnerships are invested in small private equity and venture capital funds. Investment strategies for these funds include branded consumer products, early stage technology, California geographic focus, and diversified US and non-US fund-of-funds.
5 | Corporate bonds are diversified. At December 31, 2012 and 2011, respectively, this category includes $65 million and $53 million for collateralized mortgage obligations and other asset backed securities of which $7 million and $10 million are below investment grade.
6 | Other investment entities were primarily invested in (1) emerging market equity securities, (2) a hedge fund that invests through liquid instruments in a global diversified portfolio of equity, fixed income, interest rate, foreign currency and commodities markets, and (3) domestic mortgage backed securities.
7 | Level 1 of registered investment companies primarily consisted of a global equity mutual fund which seeks to outperform the MSCI World Total Return Index. Level 2 primarily consisted of government inflation-indexed bonds and a short-term bond fund.
Schedule of Changes in Fair Value of Level 3 Investments | The following table sets forth a summary of changes in the fair value of Edison International's and SCE's Level 3 investments:
(in millions) | 2012 |  | 2011
Fair value, net at beginning of period | $ | 448 |  |  | $ | 345 |
Actual return on plan assets: |  |  |
Relating to assets still held at end of period | 88 |  |  | 6 |
Relating to assets sold during the period | 13 |  |  | 22 |
Purchases | 98 |  |  | 130 |
Dispositions | (233 | ) |  | (55 | )
Transfers in and/or out of Level 3 | — |  |  | — |
Fair value, net at end of period | $ | 414 |  |  | $ | 448 |
Postretirement Benefits Other Than Pensions |
Pension and Other Postretirement Benefits |
Information on plan assets and benefit obligations | Information on plan assets and benefit obligations for continuing and discontinuing operations is shown below:
| Edison International |  | SCE
| Years ended December 31,
(in millions) | 2012 |  | 2011 |  | 2012 |  | 2011
Change in benefit obligation |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 2,553 |  |  | $ | 2,425 |  |  | $ | 2,415 |  |  | $ | 2,295 |
Service cost | 47 |  |  | 43 |  |  | 47 |  |  | 40 |
Interest cost | 108 |  |  | 121 |  |  | 108 |  |  | 114 |
Other costs | 2 |  |  | — |  |  | 2 |  |  | — |
Actuarial (gain) loss | (86 | ) |  | 47 |  |  | (86 | ) |  | 46 |
Plan participants' contributions | 16 |  |  | 18 |  |  | 16 |  |  | 18 |
Medicare Part D subsidy received | 4 |  |  | 5 |  |  | 4 |  |  | 5 |
Benefits paid | (54 | ) |  | (106 | ) |  | (54 | ) |  | (103 | )
Deconsolidation of EME 1 | (130 | ) |  | — |  |  | — |  |  | — |
Benefit obligation at end of year | $ | 2,460 |  |  | $ | 2,553 |  |  | $ | 2,452 |  |  | $ | 2,415 |
Change in plan assets |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 1,570 |  |  | $ | 1,606 |  |  | $ | 1,570 |  |  | $ | 1,606 |
Actual return on assets | 212 |  |  | 11 |  |  | 212 |  |  | 10 |
Employer contributions | 52 |  |  | 36 |  |  | 52 |  |  | 34 |
Plan participants' contributions | 16 |  |  | 18 |  |  | 16 |  |  | 18 |
Medicare Part D subsidy received | 4 |  |  | 5 |  |  | 4 |  |  | 5 |
Benefits paid | (54 | ) |  | (106 | ) |  | (54 | ) |  | (103 | )
Fair value of plan assets at end of year | $ | 1,800 |  |  | $ | 1,570 |  |  | $ | 1,800 |  |  | $ | 1,570 |
Funded status at end of year | $ | (660 | ) |  | $ | (983 | ) |  | $ | (652 | ) |  | $ | (845 | )
Amounts recognized in the consolidated balance sheets consist of: |  |  |  |  |  |  |
Current liabilities | $ | (18 | ) |  | $ | (19 | ) |  | $ | (18 | ) |  | $ | (16 | )
Long-term liabilities | (642 | ) |  | (964 | ) |  | (634 | ) |  | (829 | )
| $ | (660 | ) |  | $ | (983 | ) |  | $ | (652 | ) |  | $ | (845 | )
Amounts recognized in accumulated other comprehensive loss (income) consist of: |  |  |  |  |  |  |
Prior service cost (credit) | $ | — |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |
Net loss | 5 |  |  | 27 |  |  | — |  |  | — |
| $ | 5 |  |  | $ | 35 |  |  | $ | — |  |  | $ | — |
Amounts recognized as a regulatory asset (liability): |  |  |  |  |  |  |
Prior service credit | $ | (89 | ) |  | $ | (125 | ) |  | $ | (89 | ) |  | $ | (125 | )
Net loss | 610 |  |  | 839 |  |  | 610 |  |  | 839 |
| $ | 521 |  |  | $ | 714 |  |  | $ | 521 |  |  | $ | 714 |
Total not yet recognized as expense | $ | 526 |  |  | $ | 749 |  |  | $ | 521 |  |  | $ | 714 |
Weighted-average assumptions used to determine obligations at end of year: |  |  |  |  |  |  |
Discount rate | 4.25 | % |  | 4.75 | % |  | 4.25 | % |  | 4.75 | %
Assumed health care cost trend rates: |  |  |  |  |  |  |
Rate assumed for following year | 8.5 | % |  | 9.5 | % |  | 8.5 | % |  | 9.5 | %
Ultimate rate | 5.0 | % |  | 5.25 | % |  | 5.0 | % |  | 5.25 | %
Year ultimate rate reached | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
1 | The postretirement plan liabilities of EME have been deconsolidated as a result of the bankruptcy filing by EME. See Note 17 for further information.
Expense Components for Plans | Expense components for continuing operations are:
| Edison International |  | SCE
| Years ended December 31,
(in millions) | 2012 |  | 2011 |  | 2010 |  | 2012 |  | 2011 |  | 2010
Service cost | $ | 47 |  |  | $ | 40 |  |  | $ | 35 |  |  | $ | 47 |  |  | $ | 40 |  |  | $ | 34 |
Interest cost | 108 |  |  | 115 |  |  | 121 |  |  | 108 |  |  | 114 |  |  | 121 |
Expected return on plan assets | (108 | ) |  | (111 | ) |  | (101 | ) |  | (109 | ) |  | (111 | ) |  | (100 | )
Other costs | 2 |  |  | — |  |  | — |  |  | 2 |  |  | — |  |  | — |
Amortization of prior service credit | (35 | ) |  | (35 | ) |  | (36 | ) |  | (35 | ) |  | (35 | ) |  | (37 | )
Amortization of net loss | 39 |  |  | 26 |  |  | 35 |  |  | 39 |  |  | 26 |  |  | 35 |
Total expense | $ | 53 |  |  | $ | 35 |  |  | $ | 54 |  |  | $ | 52 |  |  | $ | 34 |  |  | $ | 53 |
Schedule of Amounts in Accumulated Other Comprehensive Loss to be Recognized During 2013 | The estimated amounts that will be amortized to expense in 2013 for continuing operations are as follows:
(in millions) | Edison International |  | SCE
Unrecognized net loss to be amortized | $ | 28 |  |  | $ | 28 |
Unrecognized prior service credit to be amortized | (36 | ) |  | (36 | )
Weighted Average Assumptions Utilized to Determine Expense | Edison International and SCE used the following weighted-average assumptions to determine expense for continuing operations:
| Years ended December 31,
| 2012 |  | 2011 |  | 2010
Discount rate | 4.75 | % |  | 5.5 | % |  | 6.0 | %
Expected long-term return on plan assets | 7.0 | % |  | 7.0 | % |  | 7.0 | %
Assumed health care cost trend rates: |  |  |  |  |
Current year | 9.5 | % |  | 9.75 | % |  | 8.25 | %
Ultimate rate | 5.25 | % |  | 5.5 | % |  | 5.5 | %
Year ultimate rate reached | 2019 |  |  | 2019 |  |  | 2016 |
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rate | A one-percentage-point change in assumed health care cost trend rate would have the following effects on continuing operations:
| Edison International |  | SCE
(in millions) | One-Percentage-Point Increase |  | One-Percentage-Point Decrease |  | One-Percentage-Point Increase |  | One-Percentage-Point Decrease
Effect on accumulated benefit obligation as of December 31, 2012 | $ | 276 |  |  | $ | (228 | ) |  | $ | 275 |  |  | $ | (227 | )
Effect on annual aggregate service and interest costs | 13 |  |  | (11 | ) |  | 13 |  |  | (11 | )
Schedule of Expected Future Benefit Payments | The following benefit payments are expected to be paid:
| Edison International |  | SCE
(in millions) | Years ended December 31,
2013 | $ | 91 |  |  | $ | 90 |
2014 | 97 |  |  | 97 |
2015 | 103 |  |  | 103 |
2016 | 109 |  |  | 109 |
2017 | 116 |  |  | 116 |
2018 – 2022 | 662 |  |  | 659 |
Postretirement Benefits Other than Pension Plan Assets by Hierarchy Levels | The following table sets forth the PBOP Plan's financial assets for SCE that were accounted for at fair value as of December 31, 2012 by asset class and level within the fair value hierarchy:
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Common/collective funds 1 | $ | — |  |  | $ | 723 |  |  | $ | — |  |  | $ | 723 |
Corporate stocks 2 | 361 |  |  | — |  |  | — |  |  | 361 |
Corporate notes and bonds 3 | — |  |  | 210 |  |  | — |  |  | 210 |
Partnerships 4 | — |  |  | 17 |  |  | 166 |  |  | 183 |
U.S. government and agency securities 5 | 131 |  |  | 31 |  |  | — |  |  | 162 |
Registered investment companies 6 | 68 |  |  | — |  |  | — |  |  | 68 |
Interest bearing cash | 24 |  |  | — |  |  | — |  |  | 24 |
Other 7 | 6 |  |  | 104 |  |  | — |  |  | 110 |
Total | $ | 590 |  |  | $ | 1,085 |  |  | $ | 166 |  |  | $ | 1,841 |
Receivables and payables, net |  |  |  |  |  |  |  |  |  | (41 | )
Combined net plan assets available for benefits |  |  |  |  |  |  |  |  |  | $ | 1,800 |
The following table sets forth the PBOP Plan's financial assets for SCE that were accounted for at fair value as of December 31, 2011 by asset class and level within the fair value hierarchy:
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Common/collective funds 1 | $ | — |  |  | $ | 642 |  |  | $ | — |  |  | $ | 642 |
Corporate stocks 2 | 319 |  |  | — |  |  | — |  |  | 319 |
Corporate notes and bonds 3 | — |  |  | 177 |  |  | — |  |  | 177 |
Partnerships 4 | — |  |  | 16 |  |  | 130 |  |  | 146 |
U.S. government and agency securities 5 | 100 |  |  | 42 |  |  | — |  |  | 142 |
Registered investment companies 6 | 80 |  |  | — |  |  | — |  |  | 80 |
Interest bearing cash | 12 |  |  | — |  |  | — |  |  | 12 |
Other 7 | 4 |  |  | 71 |  |  | — |  |  | 75 |
Total | $ | 515 |  |  | $ | 948 |  |  | $ | 130 |  |  | $ | 1,593 |
Receivables and payables, net |  |  |  |  |  |  |  |  |  | (23 | )
Combined net plan assets available for benefits |  |  |  |  |  |  |  |  |  | $ | 1,570 |
1 | At December 31, 2012 and 2011, respectively, 60% and 63% of the common/collective assets are invested in a large cap index fund which seeks to track performance of the Russell 1000 index. 23% and 21% of the assets in this category are in index funds which seek to track performance in the MSCI Europe, Australasia and Far East (EAFE) Index. 6% and 6% of this category are invested in a privately managed bond fund and 6% and 6% in a fund which invests in equity securities the fund manager believes are undervalued.
2 | Corporate stock performance is primarily benchmarked against the Russell Indexes (50% and 53%) and the MSCI All Country World (ACWI) index (50% and 47%) for 2012 and 2011, respectively.
3 | Corporate notes and bonds are diversified and include approximately $20 million and $14 million for commercial collateralized mortgage obligations and other asset backed securities at December 31, 2012 and 2011, respectively.
4 | At December 31, 2012 and 2011, respectively, 82% and 81% of the Level 3 partnerships category is invested in (1) asset backed securities including distressed mortgages, (2) distressed companies and (3) commercial and residential loans and debt and equity of banks.
5 | Level 1 U.S. government and agency securities are U.S. treasury bonds and notes. Level 2 primarily relates to the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association.
6 | Level 1 registered investment companies consist of an investment grade corporate bond mutual fund and a money market fund.
7 | Other includes $73 million and $60 million of municipal securities at December 31, 2012 and 2011, respectively.
Changes in Fair Value of Level 3 Investments | The following table sets forth a summary of changes in the fair value of PBOP Level 3 investments:
(in millions) | 2012 |  | 2011
Fair value, net at beginning of period | $ | 130 |  |  | $ | 92 |
Actual return on plan assets |  |  |
Relating to assets still held at end of period | 20 |  |  | (3 | )
Relating to assets sold during the period | 5 |  |  | 6 |
Purchases | 35 |  |  | 48 |
Dispositions | (24 | ) |  | (13 | )
Transfers in and/or out of Level 3 | — |  |  | — |
Fair value, net at end of period | $ | 166 |  |  | $ | 130 |

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