Debt (Schedule Of Line Of Credit) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Pacific Gas And Electric Company [Member]
Debt [Line Items]
Expiration date for credit agreement	Apr. 27, 2022
Facility Limit	$ 3,000	[1]
Letters of Credit outstanding	49
Commercial Paper	50
Facility Availability	2,901
Letters of credit, sublimit	500
Swingline loans, sublimit	75
Commercial Paper Sublimit	$ 2,500
PG&E Corporation [Member]
Debt [Line Items]
Expiration date for credit agreement	Apr. 27, 2022
Facility Limit	$ 300	[2]
Letters of Credit outstanding	0
Commercial Paper	132
Facility Availability	168
Letters of credit, sublimit	50
Swingline loans, sublimit	100
Commercial Paper Sublimit	300
Credit Facilities [Member]
Debt [Line Items]
Facility Limit	3,300
Letters of Credit outstanding	49
Commercial Paper	182
Facility Availability	$ 3,069

[1] Includes a $500 million lender commitment to the letter of credit sublimits and a $75 million commitment for swingline loans.

[2] Includes a $50 million lender commitment to the letter of credit sublimits and a $100 million commitment for swingline loans defined as loans that are made available on a same-day basis and are repayable in full within 7 days.