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Compensation and Benefit Plans (Textual) (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Aug. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax | $ 0 | $ (3) |  |
Actuarial gain (loss) |  | $ (374) |  |
Percentage of Premium Included in Estimated Rate of Return of Equity Securities | 5.00% |  |  |
Percentage of Premium Included in Estimated Rate of Return of Public Equity and Hedge Funds | 2.00% |  |  |
Performance incentive plan award, shares | 49.5 |  |  |
Share-based compensation, shares available for grant | 18.0 |  |  |
Employee Stock Option |  |  |  |
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 |  |  |
Period of Historical Volatility Used to Compute Expected Volatility | 71 months | 72 months | 74 months |
Performance shares |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Stock options, vesting period, years | 3 years |  |  |
Pension Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax | $ (96) | $ (102) |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year | 123 |  |  |
Actuarial gain (loss) | 149 | (469) |  |
Defined benefit obligation increase (decrease) during the period | $ (34) | $ 214 |  |
Discount rate, percent | 4.18% | 3.85% | 4.75% | 4.00%
Permissible range of asset class weights, percent | 3.00% |  |  |
Allocation of publicly traded equity investments, percent | 63.00% | 65.00% |  |
Pension Plans | Non-US Equities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations, percent | 17.00% |  |  |
Pension Plans | US Equities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations, percent | 29.00% |  |  |
Pension Plans | Fixed Income |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations, percent | 35.00% |  |  |
Pension Plans | Opportunistic Alternative Investments |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations, percent | 15.00% |  |  |
Pension Plans | Other Investments |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations, percent | 4.00% |  |  |
Voluntary Employee Beneficiary Association (VEBA) | Non-US Equities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations, percent | 5.00% |  |  |
Voluntary Employee Beneficiary Association (VEBA) | Fixed Income |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations, percent | 85.00% |  |  |
Voluntary Employee Beneficiary Association (VEBA) | Opportunistic Alternative Investments |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations, percent | 10.00% |  |  |
Postretirement Benefits Other Than Pensions |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year | $ 33 |  |  |
Actuarial gain (loss) | 500 | $ (582) |  |
Defined Benefit Plan, Experience Gain | 300 |  |  |
Defined Benefit Plan, Change in Discount Rate | 140 |  |  |
Defined benefit obligation increase (decrease) during the period | $ (62) | $ 308 |  |
Discount rate, percent | 4.55% | 4.16% |  |
Defined Benefit Plan, Eligibility Age | 55 years |  |  |
Defined Benefit Plan, Minimum Service Period for Eligibility | 10 years |  |  |
Allocation of publicly traded equity investments, percent | 71.00% |  |  |
Postretirement Benefits Other Than Pensions | Non-US Equities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations, percent | 17.00% |  |  |
Postretirement Benefits Other Than Pensions | US Equities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations, percent | 41.00% |  |  |
Postretirement Benefits Other Than Pensions | Fixed Income |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations, percent | 34.00% |  |  |
Postretirement Benefits Other Than Pensions | Opportunistic Alternative Investments |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations, percent | 7.00% |  |  |
Postretirement Benefits Other Than Pensions | Other Investments |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations, percent | 1.00% |  |  |
Southern California Edison |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Actuarial gain (loss) |  | $ (357) |  |
Southern California Edison | Pension Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax | $ (27) | (31) |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax | 18 | 22 |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year | 94 |  |  |
Actuarial gain (loss) | 143 | (386) |  |
Defined benefit obligation increase (decrease) during the period | $ (31) | $ 199 |  |
Discount rate, percent | 4.18% | 3.85% |  |
Southern California Edison | Postretirement Benefits Other Than Pensions |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Actuarial gain (loss) | $ 500 | $ (582) |  |
Defined benefit obligation increase (decrease) during the period | $ (61) | $ 307 |  |
Discount rate, percent | 4.55% | 4.16% |  |

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- Definition The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=49168827 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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