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Earnings Per Share (Reconciliation Of PG&E Corporation's Income Available For Common Shareholders And Weighted Average Common Shares Outstanding For Calculating Diluted EPS) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income available for common shareholders	$ 31	$ 227
Weighted average common shares outstanding, basic	477	459
Employee share-based compensation	4	1
Weighted average common shares outstanding, diluted	481	460
Total earnings per common share, diluted	$ 0.06us-gaap_EarningsPerShareDiluted	$ 0.49us-gaap_EarningsPerShareDiluted

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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