Commitments And Contingencies (Environmental Remediation Liability Composed) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Topock natural gas compressor station	[1]	$ 297	$ 291
Hinkley natural gas compressor station	[1]	149	158
Former manufactured gas plant sites owned by the Utility or third parties		263	257
Utility-owned generation facilities (other than for fossil fuel-fired), other facilities, and third-party disposal sites		153	150
Fossil fuel-fired generation facilities and sites		96	98
Total environmental remediation liability		$ 958	$ 954

[1] See "Natural Gas Compressor Station Sites" below.