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Fair Value Measurements (Carrying Amount and Fair Value of Financial Instruments) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Energy recovery bonds	$ 223	$ 423
Pacific Gas and Electric Company [Member] \| Carrying Amount [Member]
Debt financial instrument	10,245	10,444
Carrying Amount [Member]
Debt financial instrument	349	349
Energy recovery bonds	636	827
Pacific Gas and Electric Company [Member] \| Estimate of Fair Value [Member]
Debt financial instrument	11,096	11,314
Estimate of Fair Value [Member]
Debt financial instrument	386	383
Energy recovery bonds	665	862
Pacific Gas and Electric Company [Member]
Energy recovery bonds	$ 223	$ 423

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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