Jointly Owned Utility Facilities (MEC) (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 3,425
Accumulated Depreciation and Amortization	1,552
Construction Work in Progress	327
Louisa Unit No. 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Company Share	88.00%
Plant in Service	745
Accumulated Depreciation and Amortization	379
Construction Work in Progress	0
Quad Cities Unit Nos. 1 & 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Company Share	25.00%	[1]
Plant in Service	628	[1]
Accumulated Depreciation and Amortization	294	[1]
Construction Work in Progress	10	[1]
Walter Scott, Jr. Unit No. 3 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Company Share	79.10%
Plant in Service	605
Accumulated Depreciation and Amortization	280
Construction Work in Progress	3
Walter Scott, Jr. Unit No. 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Company Share	59.70%	[2]
Plant in Service	440	[2]
Accumulated Depreciation and Amortization	75	[2]
Construction Work in Progress	3	[2]
Revenue Sharing Credits Netted Against Facility In Service	319
Revenue Sharing Credits Netted Against Accumulated Depreciation	53
George Neal Unit No. 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Company Share	40.60%
Plant in Service	299
Accumulated Depreciation and Amortization	140
Construction Work in Progress	0
Ottumwa Unit No. 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Company Share	52.00%
Plant in Service	282
Accumulated Depreciation and Amortization	169
Construction Work in Progress	156
George Neal Unit No. 3 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Company Share	72.00%
Plant in Service	185
Accumulated Depreciation and Amortization	137
Construction Work in Progress	154
Transmission facilities [Member]
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	241	[3]
Accumulated Depreciation and Amortization	78	[3]
Construction Work in Progress	$ 1	[3]
Jointly Owned Utility Plant Proportionate Ownership Percentage Share	Various	[3]

[1] Includes amounts related to nuclear fuel.

[2] Plant in service and accumulated depreciation and amortization amounts are net of credits applied under Iowa revenue sharing arrangements totaling $319 million and $53 million, respectively.

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