Organization and Basis of Presentation (Details 4) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment
In Service	$ 41,767	$ 39,469
Accumulated Depreciation	(11,427)	(10,793)
Property, plant and equipment in service net of accumulated provision for depreciation	30,340	28,676
Construction Work in Progress	1,310	1,235
Total net property, plant and equipment	31,650	29,911
Capital leased assets	163	173
Regulated Distribution
Property, Plant and Equipment
In Service	28,735	27,520
Accumulated Depreciation	(8,540)	(8,132)
Property, plant and equipment in service net of accumulated provision for depreciation	20,195	19,388
Construction Work in Progress	744	628
Total net property, plant and equipment	20,939	20,016
Regulated Transmission
Property, Plant and Equipment
In Service	12,023	11,041
Accumulated Depreciation	(2,383)	(2,210)
Property, plant and equipment in service net of accumulated provision for depreciation	9,640	8,831
Construction Work in Progress	526	545
Total net property, plant and equipment	10,166	9,376
Corporate/Other
Property, Plant and Equipment
In Service	1,009	908
Accumulated Depreciation	(504)	(451)
Property, plant and equipment in service net of accumulated provision for depreciation	505	457
Construction Work in Progress	40	62
Total net property, plant and equipment	$ 545	$ 519