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Jointly Owned Utility Facilities Jointly Owned Utility Facilities - MEC (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Jointly Owned Utility Plant Interests [Line Items]  
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service $ 9,871
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation 4,653
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress 172
MidAmerican Energy Company [Member]  
Jointly Owned Utility Plant Interests [Line Items]  
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service 4,506
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation 2,138
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress $ 49
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 $ 834
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation 458
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 $ 729 [1]
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation 424 [1]
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress $ 11 [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 79.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service $ 930
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation 392
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress $ 5
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 60.00% [2]
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service $ 316 [2]
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation 131 [2]
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress 1 [2]
Revenue sharing credits netted against facility in service 458
Revenue sharing credits netted against accumulated depreciation $ 94
MidAmerican Energy Company [Member] | George Neal No. 4 [Member]  
Jointly Owned Utility Plant Interests [Line Items]  
Jointly Owned Utility Plant, Proportionate Ownership Share 41.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service $ 316
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation 171
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress $ 2
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 $ 634
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation 229
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress $ 19
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 $ 489
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation 238
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress $ 4
MidAmerican Energy Company [Member] | Transmission facilities  
Jointly Owned Utility Plant Interests [Line Items]  
Jointly Owned Utility Plant, Proportionate Ownership Percentage Share Various
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service $ 258
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation 95
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress $ 0
[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 regulatory arrangements totaling $458 million and $94 million, respectively.