Jointly Owned Utility Facilities Jointly Owned Utility Facilities - MEC (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 9,316
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	3,980
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	213
MidAmerican Energy Company [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	4,004
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	1,701
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 46
MidAmerican Energy Company [Member] | Louisa Unit No 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	88.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 757
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	405
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 7
MidAmerican Energy Company [Member] | Quad Cities Unit Nos 1 and 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	25.00%	[1]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 672	[1]
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	340	[1]
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 27	[1]
MidAmerican Energy Company [Member] | Walter Scott, Jr. No. 3 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	79.10%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 608
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	297
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 6
MidAmerican Energy Company [Member] | Walter Scott Jr Unit No 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	59.70%	[2]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 448	[2]
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	91	[2]
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	0	[2]
Revenue sharing credits netted against facility in service	319
Revenue sharing credits netted against accumulated depreciation	$ 67
MidAmerican Energy Company [Member] | George Neal No. 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	40.60%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 305
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	148
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 1
MidAmerican Energy Company [Member] | Ottumwa Unit No 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	52.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 554
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	184
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 3
MidAmerican Energy Company [Member] | George Neal Unit No 3 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	72.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 415
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	153
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 0
MidAmerican Energy Company [Member] | Transmission facilities
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Percentage Share	Various	[3]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	$ 245	[3]
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	83	[3]
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 2	[3]

[1] (1)Includes amounts related to nuclear fuel.

[2] (2)Plant in service and accumulated depreciation and amortization amounts are net of credits applied under Iowa revenue sharing arrangements totaling $319 million and $67 million, respectively.

[3] (3)Includes 345 and 161 kilovolt transmission lines and substations.