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Commitments and Contingencies (Contingencies) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 1 Months Ended | 6 Months Ended | 1 Months Ended
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Dec. 31, 2011 | Jun. 30, 2010 | Jun. 30, 2012 | Jun. 30, 2012 sites | Jun. 30, 2011 | Sep. 01, 2011 | Oct. 31, 2011 Malibu Fire Order Instituting Investigation | Jun. 30, 2012 Insurance Claims | Jun. 30, 2012 San Onofre | Jun. 30, 2012 San Onofre Outage, Inspection and Repair Issues H | Oct. 31, 2011 OII Respondents Malibu Fire Order Instituting Investigation
Contingencies |  |  |  |  |  |  |  |  |  |  |
Authorized expenditures |  |  |  |  |  |  |  |  |  | $ 525,000,000 |
Authorized expenditures, after adjustments for inflation |  |  |  |  |  |  |  |  |  | 665,000,000 |
Ownership percentage (as a percentage) |  |  |  |  |  |  |  |  | 78.21% |  |
Costs incurred to date |  |  |  |  |  |  |  |  |  | 593,000,000 |
Costs incurred for steam generator inspection and repair, current period |  |  |  |  |  |  |  |  |  | 117,000,000 |
Collected customer rates, authorized operating costs, depreciation and return on investment |  |  |  |  |  |  |  |  |  | 650,000,000 |
Rate base |  |  |  |  |  |  |  |  |  | 1,200,000,000 |
Base rate, including construction work in progress |  |  |  |  |  |  |  |  |  | 2,000,000,000 |
Required term, from notice of investigation to remove revenue requirements from customer rates |  |  |  |  |  |  |  |  |  | 45 days |
Continuous hours of operation, after which rates may be readjusted |  |  |  |  |  |  |  |  |  | 100 |
Warranty period |  |  |  |  |  |  |  |  |  | 20 years |
MHI's limited liability under purchase agreement, excluding consequential damages |  |  |  |  |  |  |  |  |  | 137,000,000 |
Loss Contingency, Damages Sought, Value | 98,000,000 |  |  |  |  |  | 50,000,000 |  |  |  | 99,000,000
Maximum Expected Period for Clean Up of Identified Sites |  |  | 30 years |  |  |  |  |  |  |  |
Accrued liability for environmental remediation |  |  | 43,000,000 | 43,000,000 |  |  |  |  | 11,000,000 |  |
Number of Sites Identified for Environmental Remediation |  |  |  | 25 |  |  |  |  |  |  |
Minimum costs to be Identified Site |  |  |  | 1,000,000 |  |  |  |  |  |  |
Number of Immaterial Sites for Environmental Remediation |  |  |  | 33 |  |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Minimum |  |  | 3,000,000 | 3,000,000 |  |  |  |  |  |  |
Environmental remediation liability |  |  | 46,000,000 | 46,000,000 |  |  |  |  |  |  |
Environmental remediation liability, recorded as regulatory asset |  |  | 43,000,000 | 43,000,000 |  |  |  |  |  |  |
Portion of Recorded Liability Recoverable From Incentive Mechanism |  |  |  | 28,000,000 |  |  |  |  |  |  |
Percentage of Environmental Remediation Costs Recoverable From Incentive Mechanism |  |  |  | 90.00% |  |  |  |  |  |  |
Recorded Liability Incurred at Majority of Remaining Sites Through Customer Rates |  |  | 15,000,000 | 15,000,000 |  |  |  |  |  |  |
Percentage of Environmental Remediation Costs to be Recovered |  |  |  | 100.00% |  |  |  |  |  |  |
Amount that Cleanup Costs for Identified Material Sites Could Exceed Recorded Liability |  |  |  | 216,000,000 |  |  |  |  |  |  |
Amount that Cleanup Costs for Immaterial Sites Could Exceed Recorded Liability |  |  |  | 6,000,000 |  |  |  |  |  |  |
Expected Annual Environmental Remediation Costs, Low End of Range |  |  |  | 7,000,000 |  |  |  |  |  |  |
Expected Annual Environmental Remediation Costs, High End of Range |  |  |  | 17,000,000 |  |  |  |  |  |  |
Environmental Remediation Expense |  |  |  | 4,000,000 | 7,000,000 |  |  |  |  |  |
Federal Limit on Public Liability Claims from Nuclear Incident, Approximate |  |  |  |  |  |  |  | 12,600,000,000 |  |  |
Private Primary Insurance Purchased |  |  |  |  |  |  |  | 375,000,000 |  |  |
Maximum Deferred Insurance Premium Per Nuclear Incident |  |  |  |  |  |  |  | 235,000,000 |  |  |
Maximum Yearly Assessment Per Nuclear Incident |  |  |  |  |  |  |  | 35,000,000 |  |  |
Loss Limit, Property Damage Insurance |  |  |  |  |  |  |  | 500,000,000 |  |  |
Loss Limit, Property Damage Insurance, Federal Minimum Requirement |  |  |  | 1,100,000,000 |  |  |  |  |  |  |
Limit on Assessment of Retrospective Premium Adjustments, Per Year, Approximate |  |  |  |  |  |  |  | 49,000,000 |  |  |
Insurance Coverage for Wildfire Liabilities Limit |  |  |  |  |  | 575,000,000 |  |  |  |  |
Increase In Self Insurance Retention Per Wildfire Occurence |  |  |  |  |  | 10,000,000 |  |  |  |  |
Amount Of Damages Decision By US Court Of Federal Claims Spent Nuclear Fuel Litigation |  | $ 142,000,000 |  |  |  |  |  |  |  |  |

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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7880789&loc=SL6759159-111685 + Details
Name: | us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration