Commitments And Contingencies (Impact Of Penalty Decision) (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015
Impact Of Penalty Decision [Line Items]
Charge for disallowed capital			$ 425	$ 128
Total Penalty Decision Fines And Remedies		$ 148	235
Total Penalty Decision [Member]
Impact Of Penalty Decision [Line Items]
Fine paid to the state			300
Customer bill credit paid			400
Charge for disallowed capital	[1]		692
Total Penalty Decision Fines And Remedies			1,600
CPUC estimated cost of other remedies	[2]		50
Disallowed Revenue For Pipeline Safety Expenses	[3]		158
Penalty Decision Cumulative Charges [Member]
Impact Of Penalty Decision [Line Items]
Fine paid to the state			300
Customer bill credit paid			400
Charge for disallowed capital	[1]		642
Total Penalty Decision Fines And Remedies			1,342
Penalty Decision Future Charges and Costs [Member]
Impact Of Penalty Decision [Line Items]
Charge for disallowed capital	[1]		50
Total Penalty Decision Fines And Remedies			208
Disallowed Revenue For Pipeline Safety Expenses	[3]		158
Pacific Gas And Electric Company [Member]
Impact Of Penalty Decision [Line Items]
Charge for disallowed capital			$ 425	$ 128

[1] The Penalty Decision disallows the Utility from recovering $850 million in costs associated with pipeline safety-related projects and programs that the CPUC will identify in a phase two decision to be issued in the Utility’s 2015 GT&S rate case. The CPUC proposed in its June 23, 2016 phase one decision in the Utility’s 2015 GT&S rate case that at least $692 million of the $850 million cost disallowance be allocated to capital expenditures. (In the decision, the CPUC requests comments on whether the percentage of the disallowance that should be applied to capital expenditures as opposed to expense should be changed.) The Utility estimates that approximately $634 million of cumulative capital spending is probable of disallowance, subject to adjustment based on the CPUC phase two decision in the Utility’s 2015 GT&S rate case.

[2] In the Penalty Decision, the CPUC estimated that the Utility would incur $50 million to comply with the remedies specified in the Penalty Decision. This table does not reflect the Utility’s remedy-related costs already incurred nor the Utility’s estimated future remedy-related costs. These costs would be expensed as incurred.

[3] These costs are being expensed as incurred. Future GT&S revenues will be reduced for these unrecovered expenses.