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Earnings Per Share (Reconciliation of PG&E Corporation's Income Available for Common Shareholders and Weighted Average Shares of Common Stock Outstanding for Calculating Basic EPS) (Details) (USD $)
In Millions, except Per Share data
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Earnings Per Share        
Income available for common shareholders $ 362 $ 333 $ 561 $ 591
Less: distributed earnings to common shareholders   178   347
Undistributed Earnings, Basic, Total   [1] 155   [1] 244
Distributed earnings to common shareholders   178   347
Undistributed earnings allocated to common shareholders   149   234
Total common shareholders earnings   [1] $ 327   [1] $ 581
Weighted average common shares outstanding, basic 399 373 397 372
Convertible subordinated notes   15   16
Weighted average common shares outstanding and participating securities 399 388 397 388
Earnings Per Share, Basic, Distributed   [1],[2] $ 0.48 [2]   [1],[2] $ 0.93 [2]
Earnings Per Share, Basic, Undistributed   [1] $ 0.40   [1] $ 0.63
Total $ 0.91 $ 0.88 $ 1.41 $ 1.56
[1] EPS for 2011 was calculated by dividing the income available for common shareholders by the weighted average number of common shares outstanding.
[2] Distributed earnings, basic may differ from actual per share amounts paid as dividends, as the EPS computation under GAAP requires the use of the weighted average, rather than the actual, number of shares outstanding.