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Fair Value Measurements (Hierarchy) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets at fair value |  |
Nuclear decommissioning trusts | $ 4,039 | $ 4,870
SCE |  |
Assets at fair value |  |
Nuclear decommissioning trusts | $ 4,039 | $ 4,870
Liabilities at fair value |  |
Percentage of equity investments located in the United States (as a percent) | 74.00% | 75.00%
Collateralized mortgage obligations and other asset backed securities | $ 46 | $ 30
Payables, net, related to investments | 37 | 19
SCE | Fair Value, Measurements, Recurring |  |
Assets at fair value |  |
Derivative contracts | 32 | 44
Netting and Collateral | (31) | (31)
Money market funds and other | 26 | 253
Nuclear decommissioning trusts | 4,076 | 4,889
Total assets | 4,134 | 5,186
Liabilities at fair value |  |
Derivative contracts | 0 |
Netting and Collateral | (69) | (47)
Total liabilities | 0 |
Net assets | 4,134 | 5,186
Netting and Collateral, Total | 38 | 16
SCE | Fair Value, Measurements, Recurring | Level 1 |  |
Assets at fair value |  |
Derivative contracts | 0 |
Money market funds and other | 4 | 230
Nuclear decommissioning trusts | 2,657 | 3,157
Total assets | 2,661 | 3,387
Liabilities at fair value |  |
Derivative contracts | 0 |
Total liabilities | 0 |
Net assets | 2,661 | 3,387
SCE | Fair Value, Measurements, Recurring | Level 2 |  |
Assets at fair value |  |
Derivative contracts | 26 | 26
Money market funds and other | 22 | 23
Nuclear decommissioning trusts | 1,419 | 1,732
Total assets | 1,467 | 1,781
Liabilities at fair value |  |
Derivative contracts | 64 | 42
Total liabilities | 64 | 42
Net assets | 1,403 | 1,739
SCE | Fair Value, Measurements, Recurring | Level 3 |  |
Assets at fair value |  |
Derivative contracts | 37 | 49
Money market funds and other | 0 |
Nuclear decommissioning trusts | 0 |
Total assets | 37 | 49
Liabilities at fair value |  |
Derivative contracts | 5 | 5
Total liabilities | 5 | 5
Net assets | 32 | 44
SCE | Fair Value, Measurements, Recurring | Stocks |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,548 | 1,972
SCE | Fair Value, Measurements, Recurring | Stocks | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,548 | 1,972
SCE | Fair Value, Measurements, Recurring | Stocks | Level 2 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 0 |
SCE | Fair Value, Measurements, Recurring | Stocks | Level 3 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 0 |
SCE | Fair Value, Measurements, Recurring | Fixed Income |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 2,281 | 2,690
SCE | Fair Value, Measurements, Recurring | Fixed Income | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 942 | 1,083
SCE | Fair Value, Measurements, Recurring | Fixed Income | Level 2 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,339 | 1,607
SCE | Fair Value, Measurements, Recurring | Fixed Income | Level 3 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 0 |
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 247 | 227
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 167 | 102
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents | Level 2 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 80 | $ 125
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents | Level 3 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | $ 0 |

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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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