Commitments And Contingencies (Environmental Remediation Liability Composed) (Details) - USD ($) $ in Millions		Sep. 30, 2016	Dec. 31, 2015
Topock natural gas compressor station	[1]	$ 300	$ 300
Hinkley natural gas compressor station	[1]	140	140
Former manufactured gas plant sites owned by the Utility or third parties		305	271
Utility-owned generation facilities (other than for fossil fuel-fired), other facilities, and third-party disposal sites		143	164
Fossil fuel-fired generation facilities and sites		104	94
Total environmental remediation liability		$ 992	$ 969

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