Commitments And Contingencies (Impact Of Penalty Decision) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Impact Of Penalty Decision [Line Items]
Fine paid to the state		$ 0
Customer bill credit		0
Charge for disallowed capital		87	$ 53
Total Penalty Decision Fines And Remedies		87
CPUC estimated cost of other remedies	[1]	0
Disallowed Revenue For Pipeline Safety Expenses	[2]	0
Total Penalty Decision [Member]
Impact Of Penalty Decision [Line Items]
Fine paid to the state		300
Customer bill credit		400
Charge for disallowed capital	[3]	689
Total Penalty Decision Fines And Remedies		1,600
CPUC estimated cost of other remedies	[1]	50
Disallowed Revenue For Pipeline Safety Expenses	[2]	161
Penalty Decision Cumulative Charges [Member]
Impact Of Penalty Decision [Line Items]
Fine paid to the state		300
Customer bill credit		400
Charge for disallowed capital	[3]	494
Total Penalty Decision Fines And Remedies		1,194
CPUC estimated cost of other remedies	[1]	0
Disallowed Revenue For Pipeline Safety Expenses	[2]	0
Penalty Decision Future Charges and Costs [Member]
Impact Of Penalty Decision [Line Items]
Fine paid to the state		0
Customer bill credit		0
Charge for disallowed capital	[3]	195
Total Penalty Decision Fines And Remedies		356
CPUC estimated cost of other remedies	[1]	0
Disallowed Revenue For Pipeline Safety Expenses	[2]	161
Pacific Gas And Electric Company [Member]
Impact Of Penalty Decision [Line Items]
Charge for disallowed capital		$ 87	$ 53

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

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

[3] 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 the final decision to be issued in the Utility’s 2015 GT&S rate case. The Penalty Decision requires that at least $689 million of the $850 million cost disallowance be allocated to capital expenditures. The Utility estimates that approximately $494 million of cumulative capital spending is probable of disallowance, subject to adjustment based on the final 2015 GT&S rate case decision.