Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment in service, net	$ 61,079	$ 61,079	$ 60,411
Construction in Progress, Gross	2,607	2,607	2,098
Property, plant and equipment, net	63,686	63,686	62,509
Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	79,286	79,286	78,478
Accumulated depreciation and amortization	(24,029)	(24,029)	(23,603)
Property, plant and equipment in service, net	55,257	55,257	54,875
Construction in Progress, Gross	2,300	2,300	1,800
Regulated assets [Member] | Utility generation, transmission and distribution systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment	72,317	$ 72,317	71,536
Regulated assets [Member] | Utility generation, transmission and distribution systems | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life		5 years
Regulated assets [Member] | Utility generation, transmission and distribution systems | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life		80 years
Regulated assets [Member] | Interstate natural gas pipeline assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment	6,969	$ 6,969	6,942
Regulated assets [Member] | Interstate natural gas pipeline assets | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life		3 years
Regulated assets [Member] | Interstate natural gas pipeline assets | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life		80 years
Unregulated operation [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	7,044	$ 7,044	6,596
Accumulated depreciation and amortization	(1,222)	(1,222)	(1,060)
Property, plant and equipment in service, net	5,822	5,822	5,536
Unregulated operation [Member] | Independent power plants
Property, Plant and Equipment [Line Items]
Property, plant and equipment	5,880	$ 5,880	5,594
Unregulated operation [Member] | Independent power plants | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life		5 years
Unregulated operation [Member] | Independent power plants | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life		30 years
Unregulated operation [Member] | Other assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,164	$ 1,164	$ 1,002
Unregulated operation [Member] | Other assets | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life		3 years
Unregulated operation [Member] | Other assets | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life		30 years
Electricity Generation Plant, Non-Nuclear [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Future Periods		$ 34
Change in Accounting Estimates, Impact on Current Period From Prior Year Change	$ 8	$ 17