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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