Debt (Detail) (USD $) In Millions, unless otherwise specified							3 Months Ended											3 Months Ended
	Sep. 30, 2014 Pollution Control Bonds Series 1996 C, E, F, And 1997 B [Member]	Sep. 30, 2014 Pollution Control Bonds Series 2009 A-D [Member]	Sep. 30, 2014 Minimum [Member] Pollution Control Bonds Series 1996 C, E, F, And 1997 B [Member]	Sep. 30, 2014 Minimum [Member] Pollution Control Bonds Series 2009 A-D [Member]	Sep. 30, 2014 Maximum [Member] Pollution Control Bonds Series 1996 C, E, F, And 1997 B [Member]	Sep. 30, 2014 Maximum [Member] Pollution Control Bonds Series 2009 A-D [Member]	Sep. 30, 2014 Utility [Member]	Feb. 21, 2014 Utility [Member] Due February 15, 2024 [Member]		Aug. 15, 2014 Utility [Member] Due February 15, 2044 [Member]		Feb. 21, 2014 Utility [Member] Due February 15, 2044 [Member]		Aug. 15, 2014 Utility [Member] Due August 15, 2024 [Member]		May 12, 2014 Utility [Member] Floating Rate Senior Notes [Member] Due May 11, 2015 [Member]		Sep. 30, 2014 PG&E Corporation [Member]	Feb. 27, 2014 PG&E Corporation [Member] Due March 1, 2019 [Member]
Debt [Line Items]
Line of Credit termination date							Apr. 01, 2019											Apr. 01, 2019
Debt instrument, interest rate			0.01%	0.01%	0.03%	0.03%		3.75%		4.75%		4.75%		3.40%					2.40%
Debt instrument, face amount	$ 614	$ 309
Senior Notes								$ 450	[1]	$ 225	[2]	$ 450	[1],[3]	$ 350	[2]	$ 300	[4]		$ 350	[5]

[1] The proceeds were used to repay the 4.80% Senior Notes, in the principal outstanding amount of $539 million, to fund capital expenditures, and for general corporate purposes.

[2] The proceeds were used for general corporate purposes, including the repayment of a portion of the Utility's outstanding commercial paper, and to fund capital expenditures.

[3] Primarily relates to research and development tax credits and other timing differences.

[4] The proceeds were used for general corporate purposes, including the repayment of a portion of the Utility's outstanding commercial paper.

[5] The proceeds were used to repay the 5.75% Senior Notes, in the principal outstanding amount of $350 million.