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Commitments And Contingencies (Environmental Remediation Contingencies) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Long-term Purchase Commitment [Line Items]
Amount of environmental loss accrual expected to be recovered	$ 587
Eligible resident households for voluntary program	350
Topock Site [Member]
Long-term Purchase Commitment [Line Items]
Remediation cost recovery	90.00%
Pacific Gas And Electric Company [Member]
Long-term Purchase Commitment [Line Items]
Increase in undiscounted future costs in the event other potentially responsible parties are not able to contribute	$ 1,700

Carrying amount as of the balance sheet date of known and reasonably estimable amounts of recoveries from third-parties pertaining to an entity's environmental remediation obligations. An entity's balance sheet may include several assets that relate to an environmental remediation obligation. Among them are the following: a. Receivables from other potentially responsible parties that are not providing initial funding; b. anticipated recoveries from insurers; and c. anticipated recoveries from prior owners as a result of indemnification agreements.

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