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Compensation and Benefit Plans (Plan Assets - Fair Value Levels) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Pension Plans |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 4,194 | $ 3,777 |
Fair value NAV | 1,746 | 1,294 |
Receivables and payables, net | (23) | (22) |
Net plan assets available for benefits | 4,171 | 3,755 | $ 3,321
Pension Plans | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 797 | 833 |
Pension Plans | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 1,651 | 1,650 |
Pension Plans | SCE |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Net plan assets available for benefits | 3,940 | 3,541 | 3,124
Pension Plans | U.S. government and agency securities |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 1,157 | 1,138 |
Fair value NAV | 0 | 0 |
Pension Plans | U.S. government and agency securities | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 151 | 146 |
Pension Plans | U.S. government and agency securities | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 1,006 | 992 |
Pension Plans | Corporate stocks |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 575 | 554 |
Fair value NAV | $ 0 | $ 0 |
Pension Plans | Corporate stocks | Russell Indexes |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Performance percentage benchmark, percentage | 40.00% | 40.00% |
Pension Plans | Corporate stocks | MSCI index |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Performance percentage benchmark, percentage | 60.00% | 60.00% |
Pension Plans | Corporate stocks | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 570 | $ 547 |
Pension Plans | Corporate stocks | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 5 | 7 |
Pension Plans | Corporate bonds |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 601 | 572 |
Fair value NAV | 0 | 0 |
Pension Plans | Corporate bonds | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Corporate bonds | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 601 | 572 |
Pension Plans | Common/collective funds |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 1,017 | 693 |
Fair value NAV | $ 1,017 | $ 693 |
Pension Plans | Common/collective funds | Standard And Poors 500 Index |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Performance percentage benchmark, percentage | 37.00% | 35.00% |
Pension Plans | Common/collective funds | Russell 1000 index |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Performance percentage benchmark, percentage | 13.00% | 17.00% |
Pension Plans | Common/collective funds | MSCI All Country World Index |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Performance percentage benchmark, percentage | 40.00% | 28.00% |
Pension Plans | Common/collective funds | MSCI All Country World Index exUS |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Performance percentage benchmark, percentage | 8.00% | 12.00% |
Pension Plans | Common/collective funds | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |
Pension Plans | Common/collective funds | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Partnerships/joint ventures |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 569 | 471 |
Fair value NAV | $ 569 | $ 471 |
Pension Plans | Partnerships/joint ventures | Private equity |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Actual plan asset allocations, percentage | 49.00% | 51.00% |
Pension Plans | Partnerships/joint ventures | ABS Including Distressed Mortgages and Commercial and Residential Loans |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Actual plan asset allocations, percentage | 23.00% | 17.00% |
Pension Plans | Partnerships/joint ventures | Publicly Traded Fixed Income Securities |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Actual plan asset allocations, percentage | 19.00% | 19.00% |
Pension Plans | Partnerships/joint ventures | Broad range of financial assets in all global markets |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Actual plan asset allocations, percentage | 4.00% | 8.00% |
Pension Plans | Partnerships/joint ventures | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |
Pension Plans | Partnerships/joint ventures | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Other investment entities |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 137 | 130 |
Fair value NAV | 137 | 130 |
Pension Plans | Other investment entities | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Other investment entities | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Registered investment companies |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 92 | 133 |
Fair value NAV | 23 | 0 |
Pension Plans | Registered investment companies | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 69 | 133 |
Pension Plans | Registered investment companies | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Interest-bearing cash |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 7 | 7 |
Fair value NAV | 0 | 0 |
Pension Plans | Interest-bearing cash | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 7 | 7 |
Pension Plans | Interest-bearing cash | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Other |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 39 | 79 |
Fair value NAV | 0 | 0 |
Pension Plans | Other | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Other | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 39 | 79 |
Pension Plans | Collateralized mortgage obligations and other asset backed securities |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 54 | 45 |
PBOP |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 2,713 | 2,484 |
Receivables and payables, net | 4 | (19) |
Net plan assets available for benefits | 2,717 | 2,465 | 2,133
PBOP | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 669 | 696 |
PBOP | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 1,270 | 1,068 |
PBOP | NAV |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 774 | 720 |
PBOP | SCE |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Net plan assets available for benefits | 2,717 | 2,464 | $ 2,133
PBOP | U.S. government and agency securities |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 410 | 449 |
PBOP | U.S. government and agency securities | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 380 | 386 |
PBOP | U.S. government and agency securities | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 30 | 63 |
PBOP | U.S. government and agency securities | NAV |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PBOP | Corporate stocks |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 227 | $ 244 |
PBOP | Corporate stocks | Russell Indexes |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Performance percentage benchmark, percentage | 70.00% | 68.00% |
PBOP | Corporate stocks | MSCI All Country World Index |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Performance percentage benchmark, percentage | 30.00% | 32.00% |
PBOP | Corporate stocks | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 224 | $ 242 |
PBOP | Corporate stocks | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 3 | 2 |
PBOP | Corporate stocks | NAV |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PBOP | Corporate notes and bonds |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 1,079 | 885 |
PBOP | Corporate notes and bonds | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PBOP | Corporate notes and bonds | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 1,079 | 885 |
PBOP | Corporate notes and bonds | NAV |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PBOP | Common/collective funds |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 693 | $ 652 |
PBOP | Common/collective funds | MSCI All Country World Index Investable Market Index |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Actual plan asset allocations, percentage | 70.00% | 74.00% |
PBOP | Common/collective funds | Non-index U.S. equity fund |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Actual plan asset allocations, percentage | 22.00% | 19.00% |
PBOP | Common/collective funds | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |
PBOP | Common/collective funds | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PBOP | Common/collective funds | NAV |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 693 | 652 |
PBOP | Partnerships/joint ventures |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 81 | $ 68 |
PBOP | Partnerships/joint ventures | Private equity |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Actual plan asset allocations, percentage | 46.00% | 55.00% |
PBOP | Partnerships/joint ventures | Broad range of financial assets in all global markets |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Actual plan asset allocations, percentage | 18.00% | 15.00% |
PBOP | Partnerships/joint ventures | Asset backed securities including distressed mortgages |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Actual plan asset allocations, percentage | 36.00% | 28.00% |
PBOP | Partnerships/joint ventures | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |
PBOP | Partnerships/joint ventures | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PBOP | Partnerships/joint ventures | NAV |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 81 | 68 |
PBOP | Registered investment companies |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 65 | 66 |
PBOP | Registered investment companies | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 65 | 66 |
PBOP | Registered investment companies | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PBOP | Registered investment companies | NAV |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PBOP | Interest-bearing cash |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 26 | 17 |
PBOP | Interest-bearing cash | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PBOP | Interest-bearing cash | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 26 | 17 |
PBOP | Interest-bearing cash | NAV |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PBOP | Other |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 132 | 103 |
PBOP | Other | Municipal securities |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 61 | 66 |
PBOP | Other | Level 1 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 2 |
PBOP | Other | Level 2 |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 132 | 101 |
PBOP | Other | NAV |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PBOP | Collateralized mortgage obligations and other asset backed securities |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Receivables and payables, net | $ 170 | $ 49 |

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