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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Restricted cash $ 385 $ 380
Allowance for doubtful accounts 80 81
Regulatory assets current 1,024 1,090
Common stock, par value      
Common stock, shares authorized 800,000,000 800,000,000
Common stock, shares outstanding 421,777,738 412,257,082
Energy Recovery Bonds [Member]
   
Restricted cash 56 51
Regulatory assets current 227 336
Pacific Gas And Electric Company [Member]
   
Restricted cash 385 380
Allowance for doubtful accounts 80 81
Regulatory assets current 1,024 1,090
Common stock, par value $ 5 $ 5
Common stock, shares authorized 800,000,000 800,000,000
Common stock, shares outstanding 264,374,809 264,374,809
Pacific Gas And Electric Company [Member] | Energy Recovery Bonds [Member]
   
Restricted cash 56 51
Regulatory assets current $ 227 $ 336