Commitments and Contingencies (Nuclear Fuel Storage) (Details) (Pacific Gas and Electric Company [Member], USD $) In Millions	72 Months Ended
	Dec. 31, 2010	Mar. 31, 2010	Dec. 31, 2004
Pacific Gas and Electric Company [Member]
Costs incurred that the Utility sought recovery for			$ 92
Amount of costs awarded by U.S. Court of Federal Claims		89
Costs incurred to build on-site spent nuclear fuel storage facilities	$ 205