Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Public Utility, Property, Plant and Equipment [Line Items]
Disallowed capital expenditures	$ 407	$ 116	$ 196
Pacific Gas And Electric Company [Member]
Public Utility, Property, Plant and Equipment [Line Items]
AFUDC interest recorded	48	45	47
AFUDC equity recorded	107	100	101
Nuclear decommissioning obligation accrued	2,500	2,500
Estimated cost recovery on spent nuclear fuel storage proceeding every year	3,500	3,500
Approximate estimated nuclear decommissioning cost in future dollars	6,100	6,100
Disallowed capital expenditures	$ 407	$ 116	$ 196
Utility [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Composite depreciation rate	3.80%	3.77%	3.51%