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Compensation and Benefit Plans (Pension Plan Assets - Fair Value Levels) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Postretirement Benefits Other Than Pensions |  |  |
Pension and Other Postretirement Benefits |  |  |
Discount rate | 3.32% | 4.35% | 3.70%
Fair value of plan assets | $ 2,484 | $ 2,155 |
Fair value NAV | 720 | 584 |
Receivables and payables, net | (19) | (22) |
Net plan assets available for benefits | 2,465 | 2,133 | $ 2,330
Postretirement Benefits Other Than Pensions | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 696 | 591 |
Postretirement Benefits Other Than Pensions | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 1,068 | $ 980 |
Postretirement Benefits Other Than Pensions | SCE |  |  |
Pension and Other Postretirement Benefits |  |  |
Discount rate | 3.32% | 4.35% |
Net plan assets available for benefits | $ 2,464 | $ 2,133 | $ 2,330
Postretirement Benefits Other Than Pensions | U.S. government and agency securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 449 | 371 |
Fair value NAV | 0 | 0 |
Postretirement Benefits Other Than Pensions | U.S. government and agency securities | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 386 | 322 |
Postretirement Benefits Other Than Pensions | U.S. government and agency securities | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 63 | 49 |
Postretirement Benefits Other Than Pensions | Corporate stocks |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 244 | 204 |
Fair value NAV | 0 | 0 |
Postretirement Benefits Other Than Pensions | Corporate stocks | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 242 | 204 |
Postretirement Benefits Other Than Pensions | Corporate stocks | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 2 | $ 0 |
Postretirement Benefits Other Than Pensions | Corporate stocks | Russell Indexes |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 68.00% | 67.00% |
Postretirement Benefits Other Than Pensions | Common/collective funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 652 | $ 495 |
Fair value NAV | 652 | 495 |
Postretirement Benefits Other Than Pensions | Common/collective funds | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits Other Than Pensions | Common/collective funds | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 0 | $ 0 |
Postretirement Benefits Other Than Pensions | Common/collective funds | Non-index U.S. equity fund |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 19.00% | 19.00% |
Postretirement Benefits Other Than Pensions | Partnerships/joint ventures |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 68 | $ 89 |
Fair value NAV | 68 | 89 |
Postretirement Benefits Other Than Pensions | Partnerships/joint ventures | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits Other Than Pensions | Partnerships/joint ventures | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 0 | $ 0 |
Postretirement Benefits Other Than Pensions | Partnerships/joint ventures | Private equity and venture capital funds including branded consumer products, clean and information technology and healthcare |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 55.00% | 48.00% |
Postretirement Benefits Other Than Pensions | Partnerships/joint ventures | Broad range of financial assets in all global markets |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 15.00% | 34.00% |
Postretirement Benefits Other Than Pensions | Registered investment companies |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 66 | $ 38 |
Fair value NAV | 0 | 0 |
Postretirement Benefits Other Than Pensions | Registered investment companies | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 66 | 38 |
Postretirement Benefits Other Than Pensions | Registered investment companies | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits Other Than Pensions | Interest-bearing cash |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 17 | 22 |
Fair value NAV | 0 | 0 |
Postretirement Benefits Other Than Pensions | Interest-bearing cash | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 22 |
Postretirement Benefits Other Than Pensions | Interest-bearing cash | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 17 | 0 |
Postretirement Benefits Other Than Pensions | Other |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 103 | 104 |
Fair value NAV | 0 | 0 |
Postretirement Benefits Other Than Pensions | Other | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 2 | 5 |
Postretirement Benefits Other Than Pensions | Other | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 101 | 99 |
Postretirement Benefits Other Than Pensions | Collateralized mortgage obligations and other asset backed securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Receivables and payables, net | $ 49 | $ 59 |
Pension Plans |  |  |
Pension and Other Postretirement Benefits |  |  |
Discount rate | 3.11% | 4.19% | 3.46%
Fair value of plan assets | $ 3,777 | $ 3,393 |
Fair value NAV | 1,294 | 1,098 |
Receivables and payables, net | (22) | (72) |
Net plan assets available for benefits | 3,755 | 3,321 | $ 3,616
Pension Plans | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 833 | 697 |
Pension Plans | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 1,650 | $ 1,598 |
Pension Plans | SCE |  |  |
Pension and Other Postretirement Benefits |  |  |
Discount rate | 3.11% | 4.19% |
Net plan assets available for benefits | $ 3,541 | $ 3,124 | $ 3,390
Pension Plans | U.S. government and agency securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 1,138 | 1,047 |
Fair value NAV | 0 | 0 |
Pension Plans | U.S. government and agency securities | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 146 | 110 |
Pension Plans | U.S. government and agency securities | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 992 | 937 |
Pension Plans | Corporate stocks |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 554 | 479 |
Fair value NAV | 0 | 0 |
Pension Plans | Corporate stocks | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 547 | 473 |
Pension Plans | Corporate stocks | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 7 | $ 6 |
Pension Plans | Corporate stocks | Russell Indexes |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 40.00% | 43.00% |
Pension Plans | Corporate stocks | MSCI |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 60.00% | 57.00% |
Pension Plans | Corporate bonds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 572 | $ 582 |
Fair value NAV | 0 | 0 |
Pension Plans | Corporate bonds | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Corporate bonds | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 572 | 582 |
Pension Plans | Common/collective funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 693 | 426 |
Fair value NAV | 693 | 426 |
Pension Plans | Common/collective funds | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Common/collective funds | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 0 | $ 0 |
Pension Plans | Common/collective funds | Standard and Poor's 500 |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 35.00% | 43.00% |
Pension Plans | Common/collective funds | Russell 1000 Index |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 17.00% | 14.00% |
Pension Plans | Common/collective funds | MSCI all country world index exUS |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 28.00% | 21.00% |
Pension Plans | Common/collective funds | Non-index U.S. equity fund |  |  |
Pension and Other Postretirement Benefits |  |  |
Performance percentage benchmark, percentage | 12.00% | 15.00% |
Pension Plans | Partnerships/joint ventures |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 471 | $ 434 |
Fair value NAV | 471 | 434 |
Pension Plans | Partnerships/joint ventures | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Partnerships/joint ventures | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 0 | $ 0 |
Pension Plans | Partnerships/joint ventures | Private equity and venture capital funds including branded consumer products, clean and information technology and healthcare |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 51.00% | 50.00% |
Pension Plans | Partnerships/joint ventures | ABS including distressed mortgages and commercial and residential loans |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 17.00% | 1.00% |
Pension Plans | Partnerships/joint ventures | Broad range of financial assets in all global markets |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 8.00% | 30.00% |
Pension Plans | Partnerships/joint ventures | Publicly traded fixed income securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Actual plan asset allocations, percentage | 19.00% | 16.00% |
Pension Plans | Other investment entities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 130 | $ 236 |
Fair value NAV | 130 | 236 |
Pension Plans | Other investment entities | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Other investment entities | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Registered investment companies |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 133 | 114 |
Fair value NAV | 0 | 2 |
Pension Plans | Registered investment companies | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 133 | 112 |
Pension Plans | Registered investment companies | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Interest-bearing cash |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 7 | 2 |
Fair value NAV | 0 | 0 |
Pension Plans | Interest-bearing cash | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 7 | 2 |
Pension Plans | Interest-bearing cash | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Other |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 79 | 73 |
Fair value NAV | 0 | 0 |
Pension Plans | Other | Level 1 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Pension Plans | Other | Level 2 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 79 | 73 |
Pension Plans | Collateralized mortgage obligations and other asset backed securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 45 | $ 60 |

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