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Compensation and Benefit Plans (Textual) (Details) shares in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) plan shares | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Health reimbursement monthly contribution | $ 200 |  |
Assumed average equity risk premium (as a percent) | 5.00% |  |
Forecasted return on private equity and opportunistic investments (as a percent) | 4.00% |  |
Performance incentive plan award (in shares) | shares | 71 |  |
Share-based compensation, shares available for grant | shares | 23 |  |
Stock options |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Stock options, expiration period, years | 10 years |  |
Stock options, vesting period, years | 4 years |  |
Volatility period | 63 months | 66 months | 68 months
Global Equities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target plan asset allocations (as a percent) | 58.00% |  |
Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Expected contributions | $ 55,000,000 |  |
Permissible range of asset class weights (as a percent) | 3.00% |  |
Publicly traded equity investments located in the US (as a percent) | 59.00% | 56.00% |
Pension Plans | US Equities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target plan asset allocations (as a percent) | 23.00% |  |
Pension Plans | Non-US Equities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target plan asset allocations (as a percent) | 17.00% |  |
Pension Plans | Fixed Income |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target plan asset allocations (as a percent) | 45.00% |  |
Pension Plans | Opportunistic and/or alternative investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target plan asset allocations (as a percent) | 15.00% |  |
VEBA | Fixed Income |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target plan asset allocations (as a percent) | 95.00% |  |
VEBA | Global Equities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target plan asset allocations (as a percent) | 5.00% |  |
PBOP |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Expected contributions | $ 9,000,000 |  |
Eligibility age | 55 years |  |
Service period for eligibility (at least) (years) | 10 years |  |
Publicly traded equity investments located in the US (as a percent) | 66.00% | 65.00% |
PBOP | Fixed Income |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target plan asset allocations (as a percent) | 29.00% |  |
PBOP | Opportunistic and/or alternative investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target plan asset allocations (as a percent) | 13.00% |  |
SCE | Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Expected contributions | $ 31,000,000 |  |
SCE | VEBA |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Number of plans | plan | 3 |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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