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Commitments and Contingencies - Commitments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]    
Operating Leases, Future Minimum Payments Due [1]   $ 692
Property, Plant and Equipment [Abstract]    
Equity Method Investments $ 2,411 2,440
Property, plant and equipment, net 68,948 68,087
PacifiCorp [Member]    
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]    
Operating Leases, Future Minimum Payments Due   $ 20
PacifiCorp [Member] | Klamath Hydroelectric System [Member]    
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]    
Dam removal cost limit 200  
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | CALIFORNIA    
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]    
Dam removal cost limit 16  
Additional dam removal costs, California bond measure 250  
Capital Addition Purchase Commitments [Member] | PacifiCorp [Member]    
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]    
Purchase Obligation 486  
Maintenance, service and other contracts [Member] | MidAmerican Energy Company [Member]    
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]    
Purchase Obligation $ 301  
Counterparty Bankruptcy [Member] | Topaz [Member]    
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]    
Entity Legal Form 1  
Property, Plant and Equipment [Abstract]    
Revenue, Performance Obligation, Description of Payment Terms 1  
Property, plant and equipment, net $ 1,100  
Non-Recourse Debt $ 900  
Counterparty Bankruptcy [Member] | Agua Caliente [Member]    
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]    
Equity Method Investment, Ownership Percentage 49.00%  
Property, Plant and Equipment [Abstract]    
Revenue, Performance Obligation, Description of Payment Terms 1  
Equity Method Investments $ 47  
Non-Recourse Debt $ 800  
[1] (1) Amounts included for comparability and accounted for in accordance with ASC 840, "Leases".