Commitments And Contingencies (Impact Of Penalty Decision) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Impact Of Penalty Decision [Line Items]
Charge for disallowed capital		$ 517	$ 270
Penalty Decision [Member]
Impact Of Penalty Decision [Line Items]
Charge for disallowed capital	[1]	286
Total Penalty Decision Fines And Remedies		294
Disallowed Revenue For Pipeline Safety Expenses	[2]	8
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	[3]	50
Disallowed Revenue For Pipeline Safety Expenses	[2]	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]	692
Total Penalty Decision Fines And Remedies		1,400
Disallowed Revenue For Pipeline Safety Expenses	[2]	8
Penalty Decision Future Charges and Costs [Member]
Impact Of Penalty Decision [Line Items]
Charge for disallowed capital	[1]	0
Total Penalty Decision Fines And Remedies		150
Disallowed Revenue For Pipeline Safety Expenses	[2]	150
Pacific Gas And Electric Company [Member]
Impact Of Penalty Decision [Line Items]
Charge for disallowed capital		$ 517	$ 270

[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 finalize in a final phase two decision to be issued in the Utility’s 2015 GT&S rate case. The CPUC recommended in its May 5, 2016 phase one proposed 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. On November 1, 2016, the CPUC issued a phase two proposed decision in the 2015 GT&S rate case which allocates $689 million to capital expenditures.

[2] Future GT&S revenues will be reduced for these unrecovered expenses.

[3] 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.