Commitments And Contingencies (Impact Of Penalty Decision) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Impact Of Penalty Decision [Line Items]
Charge for disallowed capital		$ 507	$ 407	$ 116
Penalty Decision [Member]
Impact Of Penalty Decision [Line Items]
Charge for disallowed capital	[1]	283
Total Penalty Decision Fines And Remedies		412
Disallowed Revenue For Pipeline Safety Expenses	[2]	129
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]	689
Total Penalty Decision Fines And Remedies		1,600
CPUC estimated cost of other remedies	[3]	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 paid		400
Charge for disallowed capital	[1]	689
Total Penalty Decision Fines And Remedies		1,518
Disallowed Revenue For Pipeline Safety Expenses	[2]	129
Penalty Decision Future Charges and Costs [Member]
Impact Of Penalty Decision [Line Items]
Total Penalty Decision Fines And Remedies		32
Disallowed Revenue For Pipeline Safety Expenses	[2]	32
Pacific Gas And Electric Company [Member]
Impact Of Penalty Decision [Line Items]
Charge for disallowed capital		$ 507	$ 407	$ 116

[1] The Penalty Decision disallows the Utility from recovering $850 million in costs associated with pipeline safety-related projects and programs. On December 1, 2016, the CPUC issued a final phase two decision in the Utility’s 2015 GT&S rate case which allocates $689 million of the $850 million penalty to capital expenditures.

[2] GT&S revenues have been reduced for these unrecovered expenses. The remaining charges will be recognized in the first quarter of 2017.

[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 or the Utility’s estimated future remedy-related costs.