Organization and Basis of Presentation (Details 3) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment
In Service	$ 39,469	$ 37,113
Accumulated Depreciation	(10,793)	(10,011)
Property, plant and equipment in service net of accumulated provision for depreciation	28,676	27,102
Construction Work in Progress	1,235	999
Total net property, plant and equipment	29,911	28,101
Capital leased assets	173	190
Regulated Distribution
Property, Plant and Equipment
In Service	27,520	25,950
Accumulated Depreciation	(8,132)	(7,503)
Property, plant and equipment in service net of accumulated provision for depreciation	19,388	18,447
Construction Work in Progress	628	469
Total net property, plant and equipment	20,016	18,916
Regulated Transmission
Property, Plant and Equipment
In Service	11,041	10,102
Accumulated Depreciation	(2,210)	(2,055)
Property, plant and equipment in service net of accumulated provision for depreciation	8,831	8,047
Construction Work in Progress	545	480
Total net property, plant and equipment	9,376	8,527
Corporate/Other
Property, Plant and Equipment
In Service	908	1,061
Accumulated Depreciation	(451)	(453)
Property, plant and equipment in service net of accumulated provision for depreciation	457	608
Construction Work in Progress	62	50
Total net property, plant and equipment	$ 519	$ 658