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Fair Value Measurements (Fair Value by Level) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets at fair value |  |
Nuclear decommissioning trusts | $ 4,763 | $ 4,833
SCE |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 4,763 | 4,833
Liabilities at fair value |  |
Collateralized mortgage obligations and other asset backed securities | 30 | 29
Payables, net, related to investments | 172 | 206
SCE | Fair Value, Measurements, Recurring |  |
Assets at fair value |  |
Derivative contracts | 99 | 108
Netting and Collateral | (18) | (18)
Other | 26 | 62
Nuclear decommissioning trusts | 4,935 | 5,039
Total assets | 5,060 | 5,209
Liabilities at fair value |  |
Derivative contracts | 0 |
Netting and Collateral | (18) | (22)
Total liabilities | 0 |
Net assets | 5,060 | 5,209
Netting and Collateral, Total | 0 | 4
SCE | Fair Value, Measurements, Recurring | Level 1 |  |
Assets at fair value |  |
Derivative contracts | 0 |
Other | 3 | 39
Nuclear decommissioning trusts | 2,932 | 2,874
Total assets | 2,935 | 2,913
Liabilities at fair value |  |
Derivative contracts | 0 |
Total liabilities | 0 |
Net assets | 2,935 | 2,913
SCE | Fair Value, Measurements, Recurring | Level 2 |  |
Assets at fair value |  |
Derivative contracts | 14 | 6
Other | 23 | 23
Nuclear decommissioning trusts | 2,003 | 2,165
Total assets | 2,040 | 2,194
Liabilities at fair value |  |
Derivative contracts | 6 | 10
Total liabilities | 6 | 10
Net assets | 2,034 | 2,184
SCE | Fair Value, Measurements, Recurring | Level 3 |  |
Assets at fair value |  |
Derivative contracts | 103 | 120
Other | 0 |
Nuclear decommissioning trusts | 0 |
Total assets | 103 | 120
Liabilities at fair value |  |
Derivative contracts | 12 | 12
Total liabilities | 12 | 12
Net assets | 91 | 108
SCE | Fair Value, Measurements, Recurring | Stocks |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,897 | 1,908
SCE | Fair Value, Measurements, Recurring | Stocks | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,897 | 1,908
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 | 2,484 | 2,632
SCE | Fair Value, Measurements, Recurring | Fixed Income | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 552 | 519
SCE | Fair Value, Measurements, Recurring | Fixed Income | Level 2 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 1,932 | 2,113
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 | 554 | 499
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents | Level 1 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 483 | 447
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents | Level 2 |  |
Assets at fair value |  |
Nuclear decommissioning trusts | 71 | $ 52
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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